Nanozyme-enabled cancer theranostics: bridging enzyme mimicry and material intelligence

Yupeng Wang a, Xinxin Suna, Shunfeng Wanga, Zhixiao Zhangc, Jin Sunab, Cong Luoab, Zhonggui He*ab and Shenwu Zhang*a
aDepartment of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, No. 103 Wenhua Road, Shenyang 110016, PR China. E-mail: hezhonggui@vip.163.com; zhangshenwu@syphu.edu.cn; Fax: +86-024-23986321; Tel: +86-024-23986321
bJoint International Research Laboratory of Intelligent Drug Delivery Systems of Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China
cDepartment of Pharmacy, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou 121000, China

Received 27th May 2025 , Accepted 25th July 2025

First published on 4th August 2025


Abstract

Nanozymes, an innovative class of biocatalytic nanomaterials, have emerged as promising tools in cancer theranostics. By combining the advantages of nanotechnology and enzymes, nanozymes not only mimic the functions of natural enzymes but also specifically target tumor sites, significantly enhancing the efficiency of biological reactions and overcoming the limitations of natural enzymes. In this review, we first introduce the catalytic activities and physicochemical properties of nanozymes. This dual functionality bridges therapeutic intervention and diagnostic precision. Furthermore, this review discusses the relevant antitumor mechanisms of nanozymes, their key roles in multimodal cancer therapies, and their potential as cancer diagnostic tools. Finally, a comprehensive discussion is provided on the advantages, challenges, design rationales, and future directions of nanozymes in clinical translation.



Wider impact

This review highlights the prominent role of nanozymes, a novel class of nanomaterials with enzyme-like catalytic activity, in advancing cancer theranostics. Unlike natural enzymes, nanozymes combine high stability, tunable physicochemical properties, and tumor-targeting capabilities, enabling precise therapeutic intervention and accurate diagnosis. They offer insights into addressing critical challenges in cancer treatment by leveraging tumor microenvironment features to enhance therapeutic efficacy while minimizing off-target effects. The work systematically explores nanozyme-driven multimodal theranostics, offering innovative strategies for precision oncology. By bridging nanotechnology and biomedicine, this review provides a roadmap for designing next-generation cancer therapies and diagnostics, with notable potential for clinical translation. It appeals to researchers in nanotechnology, oncology, and drug delivery, fostering interdisciplinary advancements in personalized medicine.

1. Introduction

Although significant progress has been made in diagnosis and treatment, cancer remains a major threat to human health.1 In diagnosis, despite advanced imaging technologies such as computed tomography (CT) and magnetic resonance imaging (MRI), their sensitivity to early-stage tumors remains insufficient, often resulting in missed diagnoses.2 Small tumors (<5 mm in diameter) are difficult to detect, leading to delayed treatment.3 Additionally, liquid biopsy techniques for detecting circulating tumor DNA (ctDNA) and circulating tumor cells (CTCs) face challenges due to low abundance and complex separation processes, which limit their clinical utility.4 In terms of treatment, chemotherapy lacks selectivity, damaging rapidly proliferating healthy cells and causing severe side effects such as bone marrow suppression and gastrointestinal toxicity.5 Radiation therapy (RT), while effective in local tumor control, can damage surrounding normal tissues, especially in sensitive areas like the brain and spinal cord, leading to long-term complications.6 Immunotherapy, while promising, benefits only a subset of patients due to the immunosuppressive tumor microenvironment, which hinders immune cell activation and infiltration.7 Therefore, continuous exploration of novel treatment strategies and innovative drug formulations is essential to effectively address these challenges.

With the rapid advancement of nanotechnology, the integration of nanotechnology and enzymes has created new opportunities for cancer diagnosis and treatment. Owing to their nanoscale size, nanomaterials can passively accumulate in tumor tissues via the enhanced permeability and retention (EPR) effect.8 This passive targeting mechanism offers some tumor selectivity compared to larger molecules. However, passive targeting alone does not equate to “precise” targeting, as non-specific accumulation can still occur in normal tissues with vascular leakage.9 Therefore, true precision targeting requires functionalization with antibodies, peptides, aptamers, or small molecules that specifically recognize tumor-associated antigens or receptors.10

Beyond targeting, some nanomaterials exhibit enzyme-like catalytic activity, significantly improving treatment efficiency. Notably, the term “nanozyme” was first introduced by Manea et al. in 2004 to describe gold nanoparticles (AuNPs) with transphosphorylation activity.11 Later, in 2007, iron oxide nanoparticles (IONPs) were found to exhibit intrinsic peroxidase-like (POD-like) activity, greatly advancing nanozyme research in biomedicine.12 Specifically, nanozymes bridge enzyme simulation and material intelligence, imitate the functions of natural enzymes, and also possess the intrinsic ability to dynamically respond to and interact with the biological microenvironment. They integrate multiple functionalities and adapt their behavior to achieve specific therapeutic or diagnostic objectives. Composed of carbon-based nanomaterials, metal nanoparticles, and metal oxide nanostructures, nanozymes exhibit superior stability, selectivity, and therapeutic safety, overcoming natural enzyme limitations such as high cost and instability, thereby advancing cancer diagnostics and therapies.13

Recently, nanozymes have demonstrated significant potential in cancer diagnosis and treatment, highlighting a promising trajectory in this rapidly evolving field. Thus, it is an opportune time to review the latest advancements (Fig. 1). In this review, we first outline the enzymatic activities of functionalized nanozymes, including POD-like, catalase-like (CAT-like), oxidase-like (OXD-like), and superoxide dismutase-like (SOD-like) nanozymes. Although nanozymes can mimic various enzymes (e.g., hydrolases, nucleases), this review focuses on POD-, CAT-, OXD-, and SOD-like activities due to their direct relevance to tumor microenvironment (TME) modulation and established roles in cancer theranostics. Additionally, their unique physicochemical properties include optical, electromagnetic, and catalytic response characteristics. Next, the review explores nanozyme antitumor mechanisms, detailing how they generate reactive oxygen species (ROS), counteract antioxidants, modulate tumor hypoxia, reverse immunosuppression, disrupt energy metabolism, and ultimately induce tumor suppression and regression. Furthermore, the review elucidates the nanozymes-driven cancer diagnostic paradigm and consolidates a multimodal cancer therapeutic strategy involving nanozymes. It also discusses the rationale and challenges associated with the clinical translation and application of nanozymes. Lastly, we highlight future prospects and unresolved challenges in optimizing nanozymes for clinical use, offering actionable insights for designing more effective therapeutic strategies.


image file: d5mh01000d-f1.tif
Fig. 1 Schematic representation of nanozyme-enabled cancer theranostics.

2. Dual functional foundations of nanozymes

Nanozymes integrate enzymatic activity with nanomaterial properties for cancer theranostics (Fig. 2). Catalytic functions, including POD-, CAT-, OXD-, and SOD-like mimicry, exploit tumor microenvironmental aberrations to induce oxidative stress, metabolic disruption, and more.14 Moreover, their physicochemical properties enable multimodal imaging: optical plasmonic responses for photoacoustic/fluorescence imaging, magnetic contrast for MRI, and redox-responsive signal amplification for dynamic monitoring.15 Surface engineering enhances target specificity and biocompatibility, creating closed-loop systems for precise therapy and real-time feedback.16 This dual functionality bridges therapeutic intervention and diagnostic precision, which is helpful in addressing the challenges related to tumor specificity and treatment resistance.
image file: d5mh01000d-f2.tif
Fig. 2 Schematic representation of nanozymes integrate enzymatic activity with nanomaterial properties.

2.1. Catalytic antitumor functions

Nanozymes can mimic the activity of natural enzymes, making them valuable for diagnosing and treating diseases, including cancer.17 However, the widespread application of nanozymes is still hindered by an unclear catalytic mechanism. Therefore, elucidating the specific mechanisms underlying nanozymes’ catalytic activity is crucial for designing and developing effective applications in the biomedical field. Specifically, the catalytic activities of nanozymes can be categorized into POD-, CAT-, OXD-, and SOD-like activities based on their catalytic substrates (Table 1). This categorization will provide direction for the design of future advanced nanozymes, enhancing their efficacy and expanding their potential in cancer diagnosis and treatment.
Table 1 Nanozymes with enzyme-like activities and catalytic characteristics
Activities Subtypes Characteristics Nanozymes Ref.
Peroxidase Iron-based High catalytic efficiency/good stability/relatively low cost Fe3O4 NP 18
FeWOx NSs 19
Carbon-based High specific surface area/good electrical conductivity CDs@NC 20
PNCNzyme 21
Noble metal-based Surface high active site MIrP 22
PdBi NCs 23
Metal–organic framework-based High density catalytic site/good stability/controllability NixFe-MOF 24
Catalase Metal-based High catalytic efficiency/good biocompatibility Cu-TCPP-Mn 25
FePOs 26
Metal oxide-based Excellent catalytic stability/selectivity TM-EnzNAs 27
A-Pd@MoO3−xNH 28
Oxidase Gold-based Simulate conventional oxidase Au@CeO2 29
Copper-based Unique electronic structure/catalytic active site Cu MOF 30
Cu3/ND@G 31
Molybdenum-based Simulate intracellular molybdenum dependent oxidase MoO3–x NUs 32
Fe–MoOV 33
Superoxide dismutase Carbon-based High catalytic efficiency/biocompatibility Fe/N-CDs 34
ChA CQDs 35
Cerium-based High catalytic efficiency CeVO4 36
Ce-UiO-66-NO2 37


2.1.1. POD-like activity. POD is a critical oxidoreductase found in milk, leukocytes, platelets, and various other bodily fluids and cells. As a class of heme enzymes with iron protoporphyrin IX as a cofactor, POD exhibits catalytic activity toward hydrogen peroxide (H2O2) substrates. Since the initial discovery of POD-like activity in Fe3O4 NPs, numerous POD-like nanozymes have been developed. The catalytic mechanism of POD-like nanozymes involves two main processes: the Fenton-like reaction and electron transfer, each contributing to their overall enzymatic activity.38

Among them, the Fenton-like reaction mechanism is characterized by the degradation of H2O2 catalyzed by nanozymes to produce hydroxyl radicals (˙OH), which act as oxidants for substrate oxidation.39 Wang et al. designed a H2O2 self-sufficient TCP–PDA–CaO2–CeO2 (TPCC) scaffold by incorporating CaO2 and/or CeO2 nanoparticles (NPs) into chitosan solution.40 The CaO2 NPs loaded on the scaffold can release Ca2+ and sufficient H2O2 in the acidic TME. The generated H2O2 was catalyzed by the POD activity of CeO2 NPs, leading to the further production of ˙OH, while the photothermal effect of PDA coating enhanced the POD catalytic effect. In nude mice bearing HN6 cells, the combination of hyperthermia, along with CeO2 and CaO2 NPs, effectively generated highly toxic ˙OH, resulting in marked tumor suppression. Moreover, POD-like activity based on single-atom nanozymes (SAzymes) can effectively decompose H2O2 into ROS by initiating an intracellular catalytic reaction under weakly acidic conditions. Zeng et al. designed a general and simple strategy to synthesize libraries of SAzymes and dual-atom nanozymes (DAzymes) (M1–NC and M1M2–NC) with similar structures.41 Among them, Fe–N4 exhibited superior POD-like activity, with catalytic efficiency significantly enhanced by the incorporation of heteronuclear metal atoms, especially Co atoms. Given the favorable POD-like catalytic effect and photothermal conversion efficiency, in vitro and in vivo experimental results demonstrated that Fe1Co1–NC DAzymes could effectively inhibit melanoma growth through a synergistic treatment approach involving photothermal-enhanced nanocatalytic therapy.

Additionally, many nanozymes exhibit POD-like activity through electron transport mediators, which do not generate ˙OH nor interact with H2O2 via the Fenton reaction.42 Instead, these nanozymes function as electron transport mediums in catalytic reactions.43 Guo et al. employed palladium doping as a key strategy to regulate electron transfer between platinum and ZIF-8 carriers.44 The results indicated that the electron transfer number of PtxPd1@ZIF-8 nanozyme was correlated with the catalytic activity of POD, following a volcanic curve. Notably, Pt4Pd1@ZIF-8 exhibited the high catalytic activity at a moderate electron transfer number, suggesting that the introduction of Pt into Pd gradually increased Pt’s adsorption affinity for key intermediates, achieving optimal performance at Pt4Pd1@ZIF-8. In a related study, Dong et al. found that Fe2+ in Fe3O4 could transfer electrons to the surface through the Fe2+–O–Fe3+ chain, thereby regenerating surface Fe2+ and enabling a sustained POD-like catalytic reaction.45 This process was usually accompanied by the outward migration of excess oxidized Fe3+ from the lattice. After a long period of catalysis, the Fe3O4 nanozymes would undergo a crystalline phase transition to form γ-Fe2O3, exhibiting POD-like activity that could thereby be eliminated. Based on this mechanism, lithium iron phosphate (LiFePO4) was developed as a model material, showcasing the properties of self-consuming nanozymes with internal atoms involved in electron and ion transfer.

2.1.2. CAT-like activity. CAT, a vital oxidoreductase in the body, helps clear ROS, safeguard cell membranes, and hinder tumor progression by accelerating the breakdown of harmful H2O2. The natural CAT consists of four heme groups, giving it a strong interaction with the substrate H2O2. Recent advancements in nanotechnology have led to the development of nanozymes that mimic the enzymatic function of CAT.

Various metallic and nanomaterials have been designed to simulate CAT-like activity, offering excellent strength, toughness, thermal stability, and adjustable catalytic and biocompatible properties.46 Gao et al. developed a tumor-targeting photocatalytic nanosystem called ICPA by attaching a sulfhydryl-terminated AS1411 aptamer to Pt-modified COF NPs and loading the photosensitizer ICG as a model drug.47 Among them, ICPA exhibits CAT-like activity, which can generate O2 by decomposing overexpressed H2O2, effectively relieving the hypoxic microenvironment of tumor tissues. In addition, its photothermal conversion effect not only facilitated the nanoplatform to kill cancer cells through photoinduced hyperthermia but also accelerated the degradation of H2O2 and the generation of toxic singlet oxygen (1O2) via a photocatalytic cascade. Finally, ICPA demonstrated an enhanced therapeutic efficacy in hypoxic tumors through the generation of O2. Despite significant progress in the development of nanozymes, the low affinity of the majority of nanozymes for H2O2 in the TME impedes the nanocatalytic therapeutic effects of these nanozymes. To address this, Su et al. designed a single-atom Fe dispersed N-doped mesoporous carbon nanosphere (SAFe-NMCNs) nanozyme with enhanced H2O2 affinity.48 In the TME, the single-atom Fe structure of SAFe-NMCNs nanozyme showed significant dual-enzyme-like catalytic activity, mimicking both CAT and POD. This nanozyme generated O2 for ultrasound imaging and produced abundant ˙OH for tumor nanocatalytic therapy. In vivo studies on MCF-7 tumor-bearing mice demonstrated that the SAFe-NMCNs + near-infrared (NIR) group achieved the most significant inhibition of tumor growth.

2.1.3. OXD-like activity. The OXD family consists of a group of oxidoreductases that use O2 as an electron acceptor and the substrate as an electron donor, thereby facilitating the conversion of the substrate into its corresponding oxidized form. Based on the specific donor groups, the OXD family can be divided into different types, such as amine oxidase (amino group), glucose oxidase (GOx) (CH–OH group), polyphenol oxidase (Ph–OH group), sulfite oxidase (sulfur group), and cytochrome oxidase (ferrous ion).49 Recent studies have revealed that many inorganic nanomaterials, including cerium-based oxides and precious metals (Au, Pt, Pd, etc.), exhibit OXD-like activity by catalyzing the oxidation of one or more substrates in the presence of O2.

Metal-based oxides and metal–organic frameworks (MOFs) demonstrate excellent physical and chemical properties, including high specific surface area, electron mobility, thermal stability and mechanical strength, which endow them with enhanced catalytic abilities. Hu et al. developed a subnanostructurally convertible gold@ceria nanozyme (STGC) by assembling ultrafine cerium dioxide nanoparticles (CeO2 NPs) onto plasmonic gold nanorods.50 Under NIR radiation, plasma-excited hot electrons transferred from Au to CeO2, triggering CeO2–CeO2−x conversion and producing active oxygen vacancies (OVs). This internal transformation modulated the POD- and OXD-like catalytic activity of STGC-PEG, markedly elevating ROS levels in a spatiotemporal-controllable manner, thereby improving the antitumor efficiency of photocatalytic nanotherapy.

2.1.4. SOD-like activity. SOD can catalyze the conversion of superoxide ion (O2˙) into O2 and H2O2, this process constitutes an important antioxidant defense system against oxidative stress in the body.51 Natural SOD is typically a metalloprotein and SOD-like nanozymes inherit these antioxidant properties, effectively catalyzing the decomposition of O2˙ into H2O2 and O2. As early as 1985, Smalley et al. provided the earliest evidence of SOD-like nanozymes, reporting that C60 fullerene exhibited superoxide radical scavenging activity. Since then, various SOD-like nanozymes have been prepared, involving distinct catalytic mechanisms.52

SOD plays a crucial role in maintaining the balance between oxidation and antioxidation in the body, and its function is intricately connected to the development and progression of numerous diseases. In the context of cancer therapy, ensuring an optimal concentration of H2O2 and reduced glutathione (GSH) within the TME is critical for the success of nanozyme-based treatments. Wang et al. prepared FePOs nanospheres with a small particle size, which is ideal for cellular endocytosis.53 These nanospheres exhibited POD-/SOD-/CAT-like activity and demonstrated promising potential in inhibiting tumor growth. Specifically, the FePOs nanozyme exhibited POD-like activity in the acidic tumor environment, thereby catalyzing H2O2 to produce ˙OH, which effectively led to the death of cancer cells. This activity is particularly notable as it allows for a targeted approach that preserves normal tissues. Simultaneously, the enzyme system produced a combined SOD-CAT effect, maintaining the redox balance of healthy cells, and importantly, it mitigated any potential side effects associated with excess H2O2. These side effects could arise from exogenous injection or from the unintended production of O2˙ through SOD activity in healthy tissues. In vivo studies using a 4T1 tumor-bearing mice model demonstrated notable results, revealing a tumor inhibition rate reaching 84.4% after the intratumoral injection of FePOs and H2O2, with no significant physical toxicity observed. Similarly, building on the innovative approach of manipulating redox reaction kinetics within the TME using nanozymes to improve tumor targeting efficiency and reduce collateral damage to surrounding healthy tissues, Lu et al. developed a multi-enzyme-like active nanozyme (CPTH-AT).54 CPTH-AT is prepared by combining 3-amino-1,2,4-triazole (AT) with copper-doped mesoporous polydopamine (CP), further modified by triphenylphosphine (TPP) and hyaluronic acid (HA). HA modification can achieve CD44 receptor-mediated tumor targeting. This modification leads to a 3.1-fold increase in cellular uptake and more than a 5-fold increase in tumor accumulation, thereby enhancing the nanozyme's antitumor efficacy. The structural similarity of AT to natural SOD enabled it to effectively transform the abundant mitochondrial O2˙ into H2O2. Additionally, AT played an important role in stabilizing H2O2 by preventing its decomposition, thereby promoting accumulation within the mitochondria. Once in this environment, the excessive H2O2 was catalyzed by the POD-like activity of the nanozyme, generating highly toxic ˙OH, which subsequently led to oxidative damage of mitochondrial components, triggering apoptosis in cancer cells. The nanozyme ultimately reduced toxic side effects by targeting the accumulation of H2O2 in mitochondria and binding to other enzyme activities.

2.2. Diagnostic physicochemical properties

The diagnostic use of nanozymes stems not only from their enzyme-like activity, but also from their unique physicochemical properties, which enable multifunctional integration of real-time tumor biomarker detection, high-resolution imaging, and dynamic therapeutic response monitoring.55 At the nanoscale, their architecture, characterized by high surface-area-to-volume ratios and tunable porosity, facilitates efficient interactions with biological molecules, enhancing sensitivity for detecting low-abundance biomarkers such as ctDNA, exosomes, or cell surface receptors.56 Moreover, catalytic activity, mimicking natural enzymes like POD or OXD, drives signal amplification through enzymatic reactions (e.g., 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation and H2O2 decomposition), enabling colorimetric, electrochemical, or fluorescent readouts for ultrasensitive biomarker quantification.57
2.2.1. Optical characteristics. Optical characteristics of nanozymes encompass their ability to interact with light, including photothermal conversion and fluorescence emission.58 These properties are pivotal for photothermal imaging (PTI), fluorescence-guided surgery, and optical biosensing. The nanoscale size and tunable surface plasmon resonance (SPR) of metallic nanozymes, combined with the quantum confinement effects in semiconductor-based materials, underpin their optical versatility.59

The integration of PTI with catalytic therapy has emerged as a powerful strategy for precision oncology. Wei et al. developed Au–Fe3O4 Janus nanoparticles (GION@RGD) for NIR-enhanced ferroptosis-based catalytic therapy in triple-negative breast cancer (TNBC).60 The Au domain enabled strong NIR absorption, achieving a photothermal conversion efficiency of 27.5% and inducing a 34.5 °C temperature rise in vitro at 120 μg mL−1. In vivo, laser irradiation elevated tumor temperatures to 64.5 °C, enhancing Fe2+-mediated Fenton reactions via mitochondrial H2O2 amplification, which synergistically triggered lipid peroxidation and ferroptosis. RGD peptide functionalization improved tumor targeting, validated by MRI-guided T2-weighted imaging. This theranostic platform demonstrated effective tumor suppression with an 83% volume reduction.

Expanding beyond photothermal applications, fluorescence-based nanozymes offer multiplexed biomarker detection with enhanced sensitivity. Fu et al. engineered a ratiometric fluorescence platform using Cu-doped carbon nanozymes (CuAA) and Mg/N co-doped carbon quantum dots (Mg–N-CQDs) for glucose sensing.61 The CuAA catalyzed the H2O2-dependent oxidation of o-phenylenediamine (OPD) to fluorescent 2,3-diaminophenazine (DAP) at 558 nm, while Mg–N-CQDs emitted at 444 nm. The inner-filter effect (IFE) between DAP and Mg–N-CQDs enabled self-calibrated detection, achieving a linear range of 2–400 μM and clinical validation in human serum.

2.2.2. Electromagnetic characteristics. Electromagnetic properties of nanozymes involve their interactions with magnetic fields or electrical signals, enabling non-invasive imaging and electrochemical sensing.62 Superparamagnetic nanozymes generate contrast in MRI by altering proton relaxation rates, while conductive nanozymes facilitate electron transfer in biosensors for ultrasensitive biomarker detection.

Magnetic nanozymes have shown promising potential in MRI-guided theranostics.62 Li et al. developed Mn3O4-based nanoparticles (MPG NPs) for real-time MRI monitoring of multidrug resistance (MDR) in gastric cancer.63 The redox-responsive release of Mn2+ under acidic pH enhanced T1-weighted MRI contrast, enabling precise detection of tumor hypoxia and redox status. Concurrently, Mn2+ mediated Fenton-like reactions with endogenous H2O2 to generate cytotoxic ˙OH, while photothermal conversion under 808 nm laser irradiation amplified therapeutic efficacy, achieving significant tumor growth inhibition in murine models. In parallel, electroactive nanozymes are advancing biosensing technologies. Zhu et al. designed a photoelectrochemical (PEC) aptasensor using Ag2S/Ag-decorated ZnIn2S4/C3N4 Z-scheme heterostructures and Au/Cu2+–boron nitride (BNNS) nanozymes for telomerase (TE) activity detection.64 The Z-scheme heterostructure enhanced charge separation efficiency, while Au/Cu2+–BNNS catalyzed 4-chloro-1-naphthol (4-CN) oxidation to insoluble 4-chloro-1-naphthol dimer (4-CD), blocking interfacial electron transfer and achieving a detection limit of 19 cells per mL. This platform demonstrated enhanced selectivity for cancer cells over normal cells, highlighting its potential for early cancer diagnosis.

2.2.3. Catalytic response characteristics. Catalytic response characteristics refer to the ability of nanozymes to amplify diagnostic signals through enzyme-like reactions triggered by TME cues.65 These reactions generate measurable outputs such as chemiluminescence or colorimetric changes, enabling real-time monitoring of TME dynamics.65 Harnessing endogenous H2O2, Mao et al. engineered AuNPs (tAuNP/mAuNP/Lu) that aggregated via chemiluminescence-driven intermolecular cycloaddition.66 This aggregation shifted plasmon resonance to the NIR region, enabling photoacoustic imaging (PAI) and photothermal therapy with TME-specific activation. The system achieved significant tumor regression in 40% of treated mice, showcasing the potential of H2O2-triggered theranostics. Building on stimulus-responsive designs, Lu et al. developed pH-activatable SPNs@CoOOH to modulate Co3+/Co2+ ratios.67 The platform generated tumor-specific 1O2 and chemiluminescence at pH 6.5–6.8 while suppressing activity at neutral or highly acidic conditions, achieving targeted therapy with reduced off-target effects. For redox-responsive specific imaging, Wang et al. designed a GSH-activated NIR-II probe (LJ-GSH) that fluoresced at 815/910 nm upon thiophenyl ether bond cleavage.68 The probe achieved a tumor-to-normal tissue ratio of 5.85 in NIR-II imaging, guiding precise intraoperative resection with residual margins ≤0.2 mm.

3. Nanozyme-mediated antitumor mechanisms

The TME exhibits unique and complex characteristics that significantly influence tumor growth and development. During the rapid proliferation of tumors, elevated levels of H2O2 are generated, which can enhance cell proliferation and metastasis.69 Concurrently, increased concentrations of GSH render tumor cells more resistant to oxidative stress, thereby improving their survival rates.70 Moreover, the poorly developed internal vascular system often results in solid tumor tissues being in a state of hypoxia.71 This oxygen-deficient condition compels tumor cells to rely on aerobic glycolysis for energy metabolism, leading to an accumulation of lactic acid.72 In this hypoxic and acidic environment, immunosuppressive mechanisms within the TME enable tumors to effectively evade immune surveillance by recruiting dysfunctional immune cells, ultimately diminishing the efficacy of immunotherapy.73 In this complex and dysregulated microenvironment, nanozymes demonstrate a notable capacity to exploit the unique features of the TME to achieve targeted and site-specific treatment outcomes. This is achieved through a series of antitumor mechanisms specifically designed to target the distinctive characteristics of the TME, as illustrated in Fig. 3.
image file: d5mh01000d-f3.tif
Fig. 3 Schematic illustration of multiple antitumor mechanisms employed by nanozymes in response to the characteristics of the TME.

3.1. ROS generation and amplification

An excess of ROS can cause irreversible damage to cells by compromising intracellular lipids, proteins, and DNA.74 Consequently, various types of ROS, including ˙OH, peroxide ions (O22−), 1O2, and O2˙ can be harnessed for the elimination of tumor cells.75 Fortunately, nanozymes exhibit a unique capability to utilize their POD-like activity to catalyze the conversion of H2O2 into the particularly harmful ˙OH.76 This characteristic makes these nanozymes promising candidates for cancer therapy.

To further enhance the catalytic activity of nanozymes, regulating the size and electronic structure of the active site has emerged as a promising strategy. Ai et al. capitalized on this concept by employing a metal–ligand cross-linking strategy to fabricate ultra-small nanoparticles supported by porous carbon nanorods derived from metal-supramolecular polymers.77 The mechanism behind this nanozyme involves the activation of O2 to generate O2˙, which subsequently oxidizes ascorbic acid (AA) to produce H2O2. This H2O2 is then transformed into harmful ˙OH via a POD-like pathway, ultimately inducing tumor cell death. In vivo evaluations using a 4T1 tumor-bearing mice model demonstrated that the combination of AA and the nanozyme exerted a substantial inhibitory effect on tumor growth, achieving a notable inhibition rate of 60%. In addition to the aforementioned strategies, enhancing the enzyme-like activity of nanozymes can be achieved by facilitating redox cycles in the presence of X-rays. Zhang et al. introduced a nanocomposite composed of SnS2 NPs and Fe3O4 quantum dots (QDs), proposing the concept of X-ray-facilitated redox cycling of POD-like nanozymes.78 Under X-ray irradiation, SnS2 cofactors acted as electron donors, promoting electron transfer to Fe3O4 and thereby regenerating the Fe2+ sites on its surface. These regenerated Fe2+ sites reacted with overexpressed H2O2, resulting in a continuous production of reactive ROS, which enhanced the efficacy of tumor therapy. When subjected to X-ray treatment, the tumors displayed significant growth arrest, particularly in the group treated with PEG-SF NPs (PEG-SF NPs, where SF denotes SnS2–Fe3O4) combined with X-rays, demonstrating the promising potential of this integrated approach.

However, the application of nanozymes in tumor therapy is significantly hampered by poor water stability and biocompatibility.79 To address these challenges, Yang et al. explored the potential of silk fibroin (SF) as a solution.80 They developed biocompatible AuPt bimetallic nanozymes by employing biocrystals derived from chloroauric and chloroplatinic acids as raw materials. The synthesized AuP@SF (APS) nanozymes demonstrated the capability to sustainably oxidize glucose to produce H2O2 and consume intracellular GSH. Furthermore, the APS nanozymes effectively catalyzed the reaction between adsorbed O2 and endogenous H2O2, yielding O2˙ and ˙OH. Similarly, Zeng et al. designed BON nanospheres, which are biodegradable POD-mimicking enzymes enriched with N–O bonds, to catalyze the production of cytotoxic ˙OH.81 Their antitumor experiments in vivo illustrated that mice receiving injections of BON samples, as well as phosphate-buffered saline (PBS) as controls, exhibited significant tumor growth inhibition, with BON nanozymes achieving an notable 97% reduction in tumor growth.

Despite the advancements made, traditional ROS nanomaterials continue to encounter significant challenges. These include limitations related to external energy sources for tissue penetration and dependence on O2 availability, among others.58 To overcome these challenges, Liu et al. integrated ultra-small graphene quantum dots (GQDs) with POD-like activity and natural GOx into a pH-sensitive zeolitic imidazolate framework-8 (ZIF-8), resulting in the creation of an ultra-small nanozyme generator (ZIF@GOx/GQDs).82 In this innovative approach, GOx catalyzed the oxidation of glucose into H2O2 and gluconic acid within the TME, effectively disrupting the energy supply. As gluconic acid gradually induced the dissociation of ZIF-8, the ultra-small GQDs were released, facilitating substantial tumor penetration. Concurrently, the GQDs nanozyme transformed H2O2 into the toxic radical ˙OH, enabling the direct induction of endogenous ROS without relying on O2 or external energy sources. However, it is important to emphasize that the production of ROS by nanomaterials is inherently non-selective, impacting both normal and cancerous cells.79 This lack of selectivity can compromise the functionality of healthy tissues. In response to this limitation, Xu et al. designed a novel HNPs@PPy nanozyme with spatiotemporally controllable catalytic activity.83 This innovative nanozyme features a heme nanoparticle (HNPs) core and a protective polypyrrole (PPy) coating, created through the self-assembly of heme in aqueous solution and in situ polymerization of pyrrole. The steady-state catalytic kinetics demonstrated that HNPs@PPy exhibited superior catalytic activity, comparable to that of natural horseradish peroxidase (HRP). Additionally, therapeutic evaluations in 4T1 tumor-bearing mice indicated that HNPs@PPy outperformed HNPs in inhibiting tumor growth. Notably, under NIR laser irradiation, HNPs@PPy could facilitate spatiotemporally controllable production of ROS in cancer cells, achieving selectivity in cancer treatment.

3.2. Antioxidant depletion and redox reprogramming

GSH is a vital endogenous antioxidant and redox regulator predominantly found in cells, particularly tumor cells, where its concentration is often significantly higher than in normal cells.84 This small-molecule tripeptide consists of three amino acids: L-glutamic acid, L-cysteine, and glycine. Its distinctive molecular structure, characterized by a thiol (–SH) group, plays a crucial role in conferring its antioxidant properties. Notably, elevated levels of GSH are a hallmark of the TME.85 Tumor cells, during periods of rapid proliferation and heightened anabolic metabolic activity, produce significant amounts of ROS.86 While these ROS can induce apoptosis to some extent, tumor cells effectively mitigate the potential damage by upregulating GSH synthesis, thereby reducing oxidative stress and enhancing cell survival.87 This resilience against oxidative damage renders GSH a promising target for cancer therapy.88

To counteract the protective effect of GSH in tumor cells, innovative nanozymes with enzyme-like activity of oxidizing GSH have been developed, thereby enhancing the antitumor efficacy of various ROS-generating therapeutic agents. Zou et al. devised a novel approach by co-encapsulating iridium oxide nanozymes (IrOx) and β-lapachone (Lap) within thermally responsive phase change materials (PCMs) to create phase change cascade nanomedicines known as Lap-IrOx@PCM.89 In this system, the POD-like activity of IrOx enables it to react with endogenous H2O2, resulting in the release of cytotoxic ˙OH. Concurrently, IrOx exhibits glutathione oxidase-like activity to consume GSH and contributing to the accumulation of harmful ROS. Additionally, metal-based nanozymes can deplete GSH using their intrinsic physicochemical properties. Shen et al. designed a magnetic hyperthermia nanozyme, Ir@MnFe2O4 NPs, which targets mitochondria.90 Under the influence of an alternating magnetic field (AMF), these nanoparticles induce localized heating, resulting in mitochondrial damage (known as the magnetic hyperthermia effect). Notably, when GSH is overexpressed in cancer cell mitochondria, it reduces Fe(III) on the nanoparticle surface to Fe(II), leading to GSH depletion. Ultimately, these mechanisms disrupt cellular redox homeostasis, as demonstrated in in vivo experiments with mice harboring transplanted HeLa tumors, where the Ir@MnFe2O4 NPs + AMF treatment group exhibited a statistically significant reduction in tumor volume over a 14-day period.

In addition to the above innovative design using the characteristics of nanozymes themselves, improving the catalytic activity of nanozymes through structural redesign has yielded promising results. Li et al. developed a well-designed sandwich structure using cobalt ferrite layered double hydroxide (Co–Fe LDHs).91 This structure can also serve as a nanocore for loading gold nanoparticles (Au NPs) and maleimide (MA). The Co–Fe LDHs@Au@MA compound not only generates ROS and consumes GSH but also alleviates hypoxia through its Co/Fe dual-catalytic cycle, further contributing to the disruption of the established redox equilibrium within TME. Remarkably, the therapeutic efficacy against CT26 tumor-bearing mice reached 75.34% under 808 nm irradiation, showcasing the potential of Co–Fe LDHs@Au@MA to enhance oxidative stress directly at the tumor site and reshape the local TME. Similarly, the concept of defect engineering was introduced into the structural design of the nanozyme to enrich defects and vacancies and promote a better oxidation cycle. Chen et al. employed a nano-casting method to fabricate metallic n-MoSe2 photothermal nanozymes, characterized by highly ordered nanopores and dispersed selenium vacancies.92 The nanoporous structure significantly enhanced the POD-like activity through the ultra-high 1T MoSe2 phase transition while also increasing the consumption of endogenous antioxidant GSH, thus amplifying oxidative stress within the tumor. Furthermore, the metal MoSe2 with its ordered nanopores could stimulate SPR effects, enhancing photothermal therapeutic properties and oxidative stress within the NIR biological window. Consequently, under NIR laser irradiation, MoSe2 effectively disrupted the balance of redox and metabolic homeostasis in tumor regions, significantly improving therapeutic outcomes and highlighting the multifunctional potential of engineered nanozymes in cancer treatment.

3.3. Hypoxia remodeling and reoxygenation

Hypoxic regions in tumor tissues result from two main factors: rapid O2 consumption by proliferating tumor cells and poor vascularization, leading to inadequate O2 supply.71 Hypoxia not only impacts the metabolism and growth of tumor cells but also diminishes the catalytic efficiency of nanozymes.93 This reduction in efficacy is attributed to the fact that a significant proportion of catalytic reactions involving nanozymes depend on the presence of O2.58 To tackle this challenge, the researchers proposed an innovative strategy that employs H2O2, a metabolite prevalent in the TME, as a substrate. The essence of this approach lies in recognizing that H2O2 is not merely a metabolic byproduct; it can also be decomposed under specific conditions to release O2. This process provides a continuous and substantial supply of O2 for catalysis involving nanozymes. As such, nanozymes are capable of exhibiting enhanced catalytic activity even within oxygen-deficient TME environments, thereby amplifying their antitumor effects. In the study conducted by Veroniaina et al., MnO2 and the anticancer drug doxorubicin (Dox) were co-loaded into the cavity of recombinant heavy-chain ferritin (HFn), resulting in the formation of MnO2–Dox@HFn.94 By leveraging the enzyme-like activity of MnO2, MnO2–Dox@HFn can utilize the elevated concentration of H2O2 present in the TME as a substrate to generate O2, thereby addressing tumor hypoxia. Subsequent investigations demonstrated that in a 4T1 tumor mice model, tumor suppression reached a notable 78.5% within the MnO2–Dox@HFn treatment group. Similarly, Yu et al. developed a novel type of redox-responsive nanozyme known as Fe–MoOV, which achieved highly dispersed catalytic active sites through defect engineering.95 In this nanozyme, OVs serve as substrate binding pockets that facilitate nearly unobstructed dissociation of H2O2. Concurrently, iron replacement sites exhibit strong binding interactions with oxygen-containing intermediates. These design features endow Fe–MoOV nanozymes with exceptional POD-like and CAT-like catalytic activity. Furthermore, the presence of Mo sites enhances O2 adsorption; collectively, these factors contribute to enhanced catalytic performance. Further experimental results confirmed that combining Fe–MoOV with second near-infrared (IR-II) laser therapy effectively alleviated hypoxia within tumors and markedly inhibited tumor growth.

3.4. Immunosuppression reversal

The interaction between the TME and adjacent immune cells occurs via the circulatory and lymphatic systems, significantly influencing the antitumor immune response and its clinical outcomes.96 Consequently, reshaping the immunosuppressive TME has emerged as a crucial strategy for enhancing immunotherapy.97 Recent studies have demonstrated that nanomaterials possess notable potential for modulating immunosuppression within the tumor environment.

In the hypoxic TME, antitumor T-cell activation and effector functions are suppressed, enabling immune evasion by tumor cells.71 Consequently, it is reasonable to hypothesize that reversing this immunosuppressive state may be achievable through alleviating the hypoxic conditions within tumors. The capacity of nanozymes to enhance O2 transport via enzyme-like activity has been well established. In this context, Wang et al. utilized this capability to develop a nanozyme reactor termed CDSDM nano-reactor (NR), which comprises a CaO2/DOX core and a biocompatible SiO2/DOX–MnO2 shell.98 A key feature of this design is that biocompatible CaO2 serves as an O2 storage component capable of efficiently releasing O2 or H2O2, thereby providing substantial oxygenation throughout tumor tissue and mitigating hypoxia. Subsequent in vivo experiments conducted on B16F10 tumor-bearing mice demonstrated that the antitumor efficacy of cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) blockade was statistically more pronounced when used alongside CDSDM NPs compared to CTLA-4 blockade alone. These experimental findings indicate that the CDSDM NP delivery system effectively alleviates tumor hypoxia and reverses immunosuppressive conditions within the TME, thus markedly synergistically enhancing the efficacy of CTLA-4-based immunotherapy.

In addition, nanozymes can be loaded with immunomodulators to enhance their therapeutic efficacy. For instance, Deng et al. integrated Mn and SiO2 onto CaCO3 nanoparticles through cation exchange and heterophase nucleation, resulting in the development of a calcium–manganese dual-ion hybrid nanomaterial (CMS).99 This innovative material serves as an immune adjuvant that alleviates hypoxia within tumors while simultaneously activating the innate immune response and adaptive immune priming. It induces the activation of the stimulator of interferon genes (STING) signaling pathway via Mn2+, promotes the polarization of tumor-associated macrophages (TAMs) from M2 to M1 phenotype, and effectively activates dendritic cells (DCs) for enhanced antigen presentation. The experimental results demonstrated significant lymphocytic infiltration of tumor-specific cytotoxic T lymphocytes (CTLs) into tumor tissues. In studies using a 4T1 triple-negative breast cancer model, the M1/M2 macrophage ratio in the CMS-treated group was significantly higher than in controls, reaching a notable 4.8-fold increase.

Not only that, the nanozyme, while serving as a carrier, also demonstrated a synergistic effect when combined with immunomodulators, thereby enhancing its antitumor efficacy. For instance, Xu et al. constructed iron manganese silicate nanoparticles (IMSN) coated with PEG and loaded with transforming growth factor-β (TGF-β) inhibitor (TI) to create IMSN-PEG-TI nanocomposites.100 The IMSN exhibits enzyme-like activities, including POD and CAT functions, which enable it to generate ˙OH and O2. In vitro experiments using multicellular tumor spheres (MCTS) and in vivo animal models revealed that the synergistic interaction between IMSN nanomaterials and TI significantly augmented catalytic activity. Notably, both IMSN and TI effectively modulate the TME, alleviate tumor hypoxia, and increase the M1/M2 macrophage ratio and reduce the proportions of CD4+ regulatory T cells (Tregs) and CD8+ T cells. Another strategy involves combining nanozymes with immune cells to jointly target solid tumors. Zhu et al. synthesized a tumor-specific nanozyme HA@Cu2−xS-PEG (PHCN) through template chemical transformation.101 This nanozyme possesses dual properties of photothermal nanocatalysis (PNC), which can effectively reverse the immunosuppressive cancer environment while reshaping TME structure and function by disrupting its compact structure. The nanozyme-mediated photothermal effect degrades the tumor extracellular matrix and enhances blood perfusion, thus facilitating increased infiltration of B7-H3 chimeric antigen receptor T cells (B7-H3 CAR T cells). Concurrently, this nanozyme generates substantial amounts of ROS, which heighten tumor cell susceptibility to CAR T cell attack while diminishing their immune resistance. Taken together, these studies highlight the potential for the use of nanozymes in combination with immunomodulators and immune cells, opening up new avenues for antitumor therapeutic strategies.

3.5. Energy metabolism perturbation

Tumor cells typically exhibit a marked increase in glucose uptake due to their substantial energy and biosynthetic material requirements during rapid proliferation.102 This phenomenon, known as the Warburg effect, indicates that tumor cells engage in anaerobic glycolysis even under aerobic conditions, resulting in the production of lactic acid and energy.103 Consequently, glucose levels are generally elevated within these cells, reflecting a significant metabolic dependence on glucose. As an effective biocatalyst, GOx can catalyze the oxidation of glucose to produce gluconic acid and H2O2, which can profoundly influence the growth and survival of tumor cells.104 Therefore, it is reasonable to infer that nanozyme combined with GOx may serve as a promising target for tumor therapy. Wei et al. demonstrated this potential by developing a natural GOx- and PEG-based multi-enzyme active nanozyme system known as IrRu–GOx@PEG NPs.105 The role of GOx is to degrade glucose into gluconic acid and H2O2, thereby depriving tumors of essential nutrients through a “starvation” therapy approach that effectively inhibits tumor growth. Additionally, IrRu NPs can catalyze the conversion of H2O2 into highly reactive 1O2, promoting apoptosis in tumor cells. Simultaneously, IrRu NPs facilitate the transformation of H2O2 into O2, creating a glucose-depleting nanosystem that reduces O2 consumption—thereby enhancing the efficacy of starvation therapy. In vivo studies revealed significantly reduced Ki-67 (a cell proliferation marker) expression signals in tumor tissues treated with IrRu–GOx@PEG NPs, indicating that this treatment markedly decreased tumor cell proliferation while increasing apoptosis rates. In addition, the study conducted by Liu et al. also highlighted the impact of TME.106 They developed an acidic TME-responsive and radiation-mediated cascaded functional nanozyme (TLGp) by conjugating nitrogen-doped titanium nitride (TiN) NPs with pH-responsive PEG-modified GOx-encapsulated liposomes. In the acidic TME, GOx facilitates the release of glucose from PEG and catalyzes the production of substantial amounts of H2O2. Subsequently, the POD activity of TiN NPs is markedly enhanced through nitrogen doping, rendering TiN NPs highly effective in catalyzing H2O2 and ultimately generating supertoxic ˙OH, which induce tumor cell death. In vivo experiments utilizing a 4T1 tumor-bearing mice model demonstrated that tumor growth inhibition rates in the TLGp + NIR group reached approximately 96%, underscoring the potential application of this nanozyme in tumor therapy.

Notably, the combination of nanozyme with GOx resulted in a reduction in nutrient metabolism and inhibited nucleic acid repair capabilities. Tumor cells metabolize glucose through glycolysis to produce amino acids and other biological macromolecules, which serve as essential substrates for nucleic acid repair.107 Consequently, diminishing nutrient metabolism can effectively hinder the ability of tumor cells to perform nucleic acid repair.108

Furthermore, there exists a close relationship between glucose metabolism and adenosine triphosphate (ATP) levels in tumor cells.109 Although anaerobic glycolysis yields less ATP, tumor cells enhance glucose uptake and consequently increase ATP production by upregulating glucose transporters.110 The elevation of ATP not only promotes the proliferation, migration, and survival of tumor cells but also plays a crucial role in signal transduction, influencing processes such as the cell cycle and apoptosis.111 Therefore, employing nanozymes to regulate ATP levels may effectively improve therapeutic outcomes. To this end, Chang et al. developed a porous Cu SAzyme loaded with the glycoside LIK066.112 LIK066 effectively obstructs the energy source required for ATP production by inhibiting the activity of sodium-dependent glucose transporter (SGLT), thereby rendering cancer cells incapable of generating sufficient energy to synthesize heat shock proteins (HSPs). Additionally, Cu SAzyme possesses the capability to convert excess H2O2 present in TME into O2 through catalytic action, thus alleviating tumor hypoxia and activating the catalytic activity of OXD. Moreover, Cu SAzyme can catalyze O2 to form O2˙, which react with H+ under acidic TME conditions to produce 1O2; it can also facilitate the formation of ˙OH via POD activity. Ultimately, researchers successfully eliminated heat shock proteins present in cancer cells by combining SGLT inhibitors with generated ROS. Through this synergistic strategy, Cu SAzyme loaded with LIK066 efficiently removes HSPs while achieving enhanced mild photothermal therapeutic effects.

4. Nanozymes-involved multimodal cancer therapeutic strategies

Nanozymes, as the next generation of artificial enzymes, exhibit unique properties compared to natural enzymes. They exhibit remarkable stability under harsh conditions, are cost-effective, and can be easily synthesized and functionalized, all of which facilitate their diverse applications in biomedicine.113 Among these applications, nanozyme-catalyzed tumor therapy has experienced significant advancements, particularly due to the enzyme-like activity displayed by nanozymes. However, achieving an effective therapeutic outcome with a single treatment modality presents challenges primarily due to the complexity, diversity, and heterogeneity of the TME.114 To address this issue, researchers frequently combine nanozyme-catalyzed therapy with other therapeutic strategies (Fig. 4). For instance, integrating phototherapy can enhance localized treatment effects; coupling it with chemotherapy allows for a synergistic impact that targets cancer cells from multiple angles. Similarly, radiotherapy can complement nanozyme applications by increasing tumor sensitivity; starvation therapy may further deprive tumors of essential nutrients thereby amplifying overall therapeutic efficacy. Therefore, the strategic integration of these approaches, as illustrated in Table 2, not only improves the effectiveness of nanozyme-catalyzed therapy but also opens up new avenues for advanced cancer treatment paradigms.
image file: d5mh01000d-f4.tif
Fig. 4 Schematic illustration of nanozyme catalyzed therapy in combination with other therapeutic strategies.
Table 2 Nanozymes for cancer therapy
Nanozymes Activities Substrates Therapies Ref.
Cu-MOF CAT H2O2 CDT/PTT 115
Au2Pt–PEG–Ce6 POD/CAT H2O2 PTT/PDT/CDT 116
SnFe2O4 POD/CAT H2O2 PTT/PDT/CDT 117
BMIOC POD/CAT H2O2 PTT/PDT 118
GNSs CAT H2O2 PDT/PTT 119
AMPNRs POD H2O2 CDT/PTT 120
PCF-a POD/GPx H2O2/GSH Chemotherapy 121
AgPd@BSA POD H2O2 Chemotherapy/PTT 122
Pt NPs CAT H2O2 Chemotherapy/sonodynamic therapy 123
rMGB CAT/GOx H2O2/glucose Starvation therapy/PDT 124
IrRu–GOx@PEG NPs POD/CAT/GOx H2O2/glucose Starvation therapy/oxidative therapy 125
Ru@CeO2 YSNs CAT H2O2 RT/PTT 126
MSNR@MnO2–Au CAT H2O2 RT/PTT 127
Pt–CuS CAT H2O2 Sonodynamic therapy 128
IMSNs CAT H2O2 Immunotherapy 129
Bac-Au@Pt POD/OXD H2O2/O2 Immunotherapy/CDT 130
PHCNs POD H2O2 Immunotherapy/PTT 131


4.1. Oxidative attack strategies

Oxidative attack and redox-modulating strategies leverage nanozymes to perturb the redox homeostasis of tumors by either augmenting cytotoxic ROS production or depleting intracellular antioxidants. This approach capitalizes on the elevated basal ROS levels in the TME, where cancer cells rely heavily on GSH and glutathione peroxidase 4 (GPX4) to counteract oxidative stress.132 Nanozymes, such as transition metal-based nanoparticles, exhibit POD-, CAT-, or OXD-like activities that can either decompose H2O2 into ˙OH or O2˙ under TME-specific conditions.133 By disrupting the antioxidant defense systems, these nanozymes induce ferroptosis or apoptosis directly through mitochondrial dysfunction.
4.1.1. Chemodynamic therapy. Chemodynamic therapy (CDT) has emerged as a promising strategy for tumor treatment, fundamentally based on the exploitation of the mildly acidic microenvironment (pH 6.5–6.8) and elevated levels of H2O2 present within the TME.134 In this therapeutic approach, Fenton reactions or Fenton-like reactions are utilized to catalyze the conversion of H2O2 into highly reactive ˙OH.135 This transformation not only increases intracellular oxidation levels but also inflicts severe oxidative damage to cancer cells. Specifically, the generation of ˙OH radicals results in DNA damage, which triggers cell cycle arrest and apoptosis.136 Furthermore, these ˙OH radicals inactivate intracellular proteins, impairing their normal functions and potentially disrupting critical cell signaling pathways.137 Concurrently, lipid peroxidation leads to the accumulation of lipid peroxides, which exacerbate membrane lipid damage.138

The role of nanozymes in enhancing the Fenton-like reaction represents a significant advancement in improving the efficacy of CDT. A notable example is provided by Sang et al., who engineered the H2O2 steady-state disruptor PZIF67-AT.139 This was accomplished through the modification of the small molecule inhibitor 3-amino-1,2,4-triazole (3-AT) and PEG on zeolitic imidazole framework-67 (ZIF-67) nanoparticles. The disruptor demonstrated SOD-mimicking activity, facilitating the conversion of O2˙ into H2O2 while concurrently inhibiting CAT activity and depleting GSH. This dual action impaired the conversion of H2O2 to water, leading to an accumulation of H2O2 within cancer cells. Consequently, this elevated concentration of H2O2 was subsequently transformed into more potent ˙OH, inducing oxidative stress within the cells and enhancing CDT efficacy via the Fenton reaction. It is crucial to recognize that the potential of nanozymes extends well beyond a singular application. They can facilitate a series of synergistic functions through the integration of multiple processes. For instance, photodynamic properties combined with cascaded nanocatalytic reactions can enhance the enzymatic cascade reaction cycle, thereby significantly improving overall therapeutic efficacy. Cao et al. developed Fe3O4/Ag/Bi2MoO6 photoactivatable nanozymes (FAB NPs) by integrating Fe3O4 and Ag nanoparticles with Bi2MoO6 (BMO) nanoparticles, resulting in materials characterized by strong NIR-II absorption.140 This design led to markedly improved photocatalytic activity, as well as ferromagnetic and photothermal effects. As a result, the TME facilitates the exertion of various nanozyme activities, including those that mimic POD, CAT, SOD, and glutathione peroxidase (GPx). This enables the initiation of an enzyme-linked reaction that continuously generates both ˙OH and 1O2. Following the administration of FAB NPs combined with laser irradiation in 4T1 tumor-bearing mice, tumor temperatures increased to 45.6 °C within 7 minutes, achieving effective photothermal therapy. Notably, without laser application, CDT utilizing FAB NPs exhibited limited inhibition of tumor growth. However, implementing daily seven-minute laser irradiations resulted in a notable 80% reduction in tumor volume compared to control groups. In fact, twice-daily laser treatments culminated in complete tumor regression within 16 days, underscoring the synergistic efficacy derived from the integrated approaches of CDT, photodynamic therapy (PDT), and PTT using FAB NPs.

Further, the integration of CDT with PTT constitutes a robust strategy to elevate local temperatures through synergistic effects. This approach not only accelerates the Fenton reaction but also enhances the therapeutic efficacy of CDT. Qian et al. demonstrated this synergy through the synthesis of 9 T-PUNNC via a one-pot magnetic solvothermal method using nickel chloride hexahydrate and polyethylene glycol as precursors under a 9 T high magnetic field.141 The resulting nanoparticle design exhibited needle-like nanostructures that improved NIR light absorption in NIR-II, converting it into localized hyperthermia for effective photothermal treatment. Concurrently, the Fenton-like activity of nickel ions (from nickel chloride hexahydrate) facilitated Ni2+ release under NIR light, which mediated CDT. In vivo experiments indicated that treatment with 9 T-PUNNC (9 T-magnetic field-synthesized PEG-stabilized nickel nanocrystals) effectively eliminated tumor cells in mice bearing 4T1 tumors, demonstrating nearly a 12-fold increase in efficacy compared to controls, along with an approximate 9-fold reduction in tumor growth under irradiation at 1064 nm. The advantages extend beyond this; the nanozyme can also function as a carrier for photosensitizers, thereby enhancing synergies with PDT. This combination of the two modalities has the potential to yield synergistically enhanced therapeutic efficacy. Sheng et al. developed a formulation named Ce6@MIL-100/HA (CMH NPs) by encapsulating Ce6 within MIL-100 nanoparticles, which were subsequently coated with HA.142 These CMH NPs exhibited POD-like activity and could interact with the elevated levels of H2O2 present in tumors. The ˙OH and O2 generated by CMH NPs contributed to both CDT and alleviation of hypoxia. Furthermore, upon exposure to NIR light irradiation, the Ce6-mediated photodynamic reactions not only produced cytotoxic 1O2, enhancing O2 supply and improving PDT effectiveness but also generated additional H2O2, thus amplifying the Fenton-like reaction. This cascade effect resulted in a highly efficient therapeutic cycle. Subsequent injection of CMH NPs into mice bearing 4T1 tumors followed by irradiation with a 671 nm NIR laser demonstrated a significant reduction in tumor volume. This suggests that the combined therapeutic modalities of CDT and PDT can lead to nearly complete inhibition of tumor growth.

4.1.2. Radiation therapy. RT is a fundamental component of cancer treatment that employs high-energy ionizing radiation, such as X-rays and γ-rays, to eliminate cancer cells.143 This therapeutic modality ranks among the three mainstay approaches in contemporary oncology, with the overarching goal of controlling or completely eradicating tumors by disrupting the DNA structure of malignant cells, thereby inhibiting their growth and reproduction.144 A critical mechanism underlying RT efficacy is the generation of ROS, such as ˙OH and O2˙, through water radiolysis.145 These ROS amplify DNA damage and oxidative stress, overwhelming DNA repair mechanisms and triggering apoptotic pathways.146 RT has a broad spectrum of applications across various cancer types, particularly in scenarios where complete surgical resection is impractical or chemotherapy is ineffective.147

In addition to traditional approaches, research has shown that nanozymes, which are engineered nanoparticles that mimic enzymatic functions, can significantly improve the effectiveness of RT by creating synergistic relationships between these treatment modalities. A compelling example of this innovation is presented in the work of Huang et al., who developed a biomimetic nanozyme system (CF) that integrates an FeS2 nanozyme with cancer cell-derived exosomes (CDE).148 The CF system showcased remarkable capabilities, as it harnessed the activities of glutathione oxidase activity and POD to deplete GSH levels within tumor tissues. This depletion catalyzed significant production of ˙OH from intracellular H2O2, thereby disrupting redox homeostasis and compromising mitochondrial integrity, which ultimately mitigated RT resistance. Furthermore, following the injection of these engineered nanomaterials into the tail veins of mice bearing 4T1 tumors, radiofrequency (RF) irradiation facilitated circulation to TME, where it was endocytosed by tumor cells, allowing for FeS2 release within the TME. This mechanism highlights the therapeutic potential of the CF + RT system, which profoundly inhibited tumor growth—tumor volume expansion was nearly fully inhibited during treatment.

Building on this paradigm, Yuan et al. synthesized Mn3O4 nanoparticles encapsulated within hollow mesoporous silica nanoparticle (HMSN) channels, subsequently loading them with DOX and functionalizing them with arginine–glycine–aspartic acid (RGD) peptide.149 This innovative construct, designated as DOX@HMSN/Mn3O4(R), established an integrated platform for radiation sensitization, chemotherapy, and catalytic therapy. The dual functionality of DOX@HMSN/Mn3O4(R) enabled it to function both as CAT-like and OXD-like activities, thereby disrupting the redox balance through excessive ROS production and the reduction of Mn3+ to Mn2+. This reaction not only initiated TME responses but also exhibited significant antitumor activity in both in vitro and in vivo settings. Notably, during radiotherapy, high-energy X-rays stimulated the outer electrons of the nanozyme, resulting in the generation of photoelectrons that participated in OXD-like enzymatic reactions. This process amplified ROS accumulation, significantly enhancing the efficacy of both RT and chemotherapy. To comprehensively evaluate the antitumor potential of the DOX@HMSN/Mn3O4(R) nanozyme, a nude mice model bearing A375 xenografts was established. Following intravenous administration of these nanomaterials, mice underwent X-ray irradiation at a dosage of 2 Gy over a month-long treatment period. The combination approach demonstrated significantly antitumor efficacy compared to treatment with the nanozyme alone, further emphasizing the synergistic benefits of integrating novel nanozyme strategies with established therapeutic modalities.

However, since RT is known to pose risks to the nervous system, which is a crucial target of ionizing radiation exposure, it is essential to develop therapeutic strategies that effectively eliminate tumors while also protecting neuronal health.150 In a compelling study conducted by Han et al., which involved CeVO4 nanozymes in a glioblastoma (GBM) radiotherapy model, researchers uncovered a significant dual role: CeVO4 nanozymes not only protected neuronal cells from high-dose ionizing radiation damage but also effectively destroyed tumor cells.151 Further investigation revealed that within the acidic TME, CeVO4 accumulated substantially in endosomes, where it released ROS to mediate tumor cell apoptosis by catalyzing the decomposition of H2O2 and generating ˙OH. Conversely, in the neutral environment of neuronal cells, CeVO4 effectively avoided lysosomal degradation and predominantly accumulated in and around mitochondria. This strategic localization enabled the nanoparticles to prevent radiation-induced damage in neuronal cells through enhanced SOD-like activity.

4.2. Metabolic disruption strategies

Metabolic disruption strategies target the aberrant metabolic reprogramming in cancer cells, such as aerobic glycolysis or amino acid dependencies.152 Nanozymes can disrupt energy production or nutrient uptake by mimicking enzymes in key metabolic pathways. For example, GOx-mimicking nanozymes, such as Au or CuO nanoparticles, catalyze the oxidation of glucose to gluconic acid and H2O2, thereby depleting extracellular glucose levels and generating intracellular ROS.153 This dual effect not only starves cancer cells of their primary energy source but also exacerbates oxidative stress, thereby creating a synergistic cytotoxic microenvironment.
4.2.1. Starvation therapy. Starvation therapy has emerged as an innovative strategy for cancer treatment, operating by inhibiting tumor cell growth through limiting or depriving them of essential nutrients and energy sources required for survival.154 This approach effectively targets critical processes such as angiogenesis, nutrient acquisition, and the material and energy metabolism.155 Tumor cells, which require substantial quantities of nutrients and energy for growth and reproduction, are significantly affected by starvation therapy due to its reduction in the supply of these vital components.156 As a result, tumor cells enter a state of “starvation”, severely compromising their ability to survive and proliferate. In addition to its primary action against tumor growth, starvation therapy also shows potential for enhancement when used in conjunction with other therapeutic modalities. Consequently, it has garnered increasing attention and is being investigated as a promising adjuvant therapy in cancer treatment.

Within this context, certain nanozymes exhibiting GOx-mimicking activity can be integrated with starvation therapy to enhance overall treatment efficacy. A notable example is the work by Fu et al., who developed a bionic CoO@AuPt nanozyme.157 This nanozyme was synthesized by assembling Au and Pt nanoparticles onto the surface of hollow CoO nanocapsules. The intrinsic CAT and POD activities of these nanoparticles facilitate the decomposition of substantial amounts of H2O2 within cells, resulting in the production of O2 and ˙OH. Furthermore, the Au/Pt nanosatellites demonstrate robust GOx-like activity. In the presence of O2, they significantly reduce glucose levels within tumors while concurrently generating large quantities of H2O2. This interplay between glucose consumption and H2O2 generation effectively promotes tumor starvation and enhances outcomes in CDT through an enzymatic self-supply mechanism for H2O2. In vivo evaluations in BALB/c mice bearing 4T1 tumors revealed a tumor growth inhibition index (TGI) of 58.6% on day 15 for the CoO@AuPt NPs treatment group, significantly exceeding the 29.5% inhibition observed in the DOX-treated group. These compelling findings confirm that CoO@AuPt NPs confer effective tumor inhibition. Building upon this foundation, Zeng et al. further advanced the field by designing a nanophase mixture composed of porous Fe2O3 nanoparticles and ultra-small Au NPs for the synergistic treatment of triple-negative breast cancer (TNBC).158 This Fe2O3/Au nanozyme exhibited prominent GOx-like activity, facilitating the conversion of glucose into gluconic acid and H2O2. This dual action not only depletes energy resources for tumor cells but also generates H2O2, which can be transformed into ˙OH via its significant POD-like activity. Moreover, the modification of Au NPs significantly enhances the photothermal conversion efficiency of the porous Fe2O3 nanoparticles. In vivo studies using a 4T1 tumor-bearing BALB/c mice model demonstrated that the Fe2O3/Au–PEG treatment combined with laser exposure increased the tumor site temperature by 14 °C, reaching as high as 39 °C, and effectively slowed tumor growth. These results suggest that the Fe2O3/Au hybrid nanozyme represents a multifunctional therapeutic agent, acting through multiple mechanisms including starvation therapy, CDT, and PTT.

4.2.2. Gas therapy. Gas therapy (GT) represents a pioneering approach to cancer treatment, employing specific gas signaling molecules such as hydrogen sulfide (H2S), nitric oxide (NO), carbon monoxide (CO), hydrogen (H2), and O2.159 These gaseous molecules induce apoptosis in cancer cells through either s synergistic modulation of signaling pathways or direct cytotoxic actions.160 In addition to their roles as signaling entities, they also regulate physiological functions and metabolic processes within living organisms, highlighting the complexity of their actions in cellular environments.161 Given its high efficacy, favorable safety profile, and minimal adverse effects, gas therapy holds significant promise for diverse therapeutic applications.162 As research advances into the mechanisms underlying gas signaling molecules, it becomes increasingly evident that gas therapy has the potential to evolve into an key complementary modality for cancer treatment in the future.

A particularly promising avenue of research lies in the integration of GT with catalytic therapies that utilize nanozymes. This combination capitalizes on the catalyzed release of loaded drugs alongside specific gas molecules, ultimately resulting in a synergistic antitumor effect through the production of toxic gases and ROS. In a compelling study conducted by Ning et al., iron sulfide doxorubicin nanoparticles (FeS-Dox@bLf NZs) were developed to enhance therapeutic efficacy.163 These nanoparticles, coated with bovine lactoferrin and encapsulating doxorubicin, exploit their POD-like activity under acidic conditions during synthesis. This process leads to the release of Fe2+ and S2−, which subsequently generate ˙OH and H2S, respectively. After intravenous administration and laser irradiation, FeS-Dox@bLf NZs significantly affected body weight and tumor progression in 4T1 tumor-bearing mice. The experimental results confirmed that PDT could effectively induce apoptosis via H2S, thereby enhancing the overall performance of FeS-Dox@bLf NZs. Notably, this innovative formulation mitigated the side effects typically associated with doxorubicin in critical tissues, elevated free radical levels within 4T1 cells, and exhibited enhanced antitumor efficacy. Building on this theme, Chen et al. explored an innovative collaboration that combines a SO2 prodrug, benzothiazole sulfinate (BTS), with copper single-atom nanozymes (Cu SAZ) encapsulated within platelet membrane vesicles (PV).164 The Cu SAZ nanoparticles, characterized by their POD-like activity, demonstrate remarkable NO-generating capabilities. Importantly, as BTS releases SO2, this process generates the free radical SO3˙, which plays a crucial role in inducing apoptosis in tumor cells. Furthermore, there is a self-amplifying effect, marked by a reduction in GSH levels and an increase in H2O2 concentrations within the TME. The efficacy of BTS was validated through in vivo experiments utilizing a BALB/c nude mice model, achieving a notable tumor growth inhibition rate of over 90% alongside strong tumor targeting and biocompatibility.

4.3. Physicochemical synergy strategies

Physicochemical synergy strategies integrate nanozyme activity with external stimuli or chemotherapeutics to achieve multi-modal therapy. For instance, photo-responsive nanozymes, such as porphyrin-based MOFs loaded with Pt or Au nanoparticles, can simultaneously generate ROS under NIR light and enhance enzymatic activity through localized photothermal heating.165 Furthermore, chemo-nanozyme hybrid systems, where nanozymes are combined with conventional chemotherapeutic agents, exploit the TME’s acidic pH or glutathione-rich environment to trigger drug release while augmenting ROS generation.166 By integrating multiple therapeutic modalities, these strategies provide a promising approach to tackle the heterogeneity and treatment resistance of solid tumors.
4.3.1. Phototherapy. Phototherapy has emerged as a promising approach in cancer treatment by using specific light sources, especially NIR light, to irradiate targeted tumor regions. This process initiates photophysical and photochemical reactions that activate phototherapeutic agents, ultimately resulting in the destruction of cancer cells.167 Central to this mechanism is the selection and application of phototherapeutic agents that generate heat or other energy forms upon light exposure, effectively inducing tumor cell death.168 To enhance the efficacy of phototherapy, nanozymes are increasingly being employed as carriers for these therapeutic reagents.169 These remarkable nanozymes mimic natural enzyme activity, facilitating biochemical reactions that not only enable efficient delivery of phototherapeutic agents but also catalyze TME remodeling, thereby improving overall therapeutic outcomes.

Phototherapy encompasses two primary modalities: PDT and PTT.170 PDT is predicated on the administration of safe, non-toxic photosensitizers that, upon exposure to light, generate 1O2—a potent agent capable of inducing cell death in tumors.171 Chen et al. demonstrated the efficacy of hollow mesoporous silica nanoparticles (HMSNs) as carriers for ultra-small Au NPs and MnO2 within a TME-responsive cascade catalytic reactor.172 In this innovative model, MnO2 catalyzes the conversion of O2 into highly toxic 1O2 under 630 nm light irradiation. Simultaneously, Au NPs facilitate the oxidation of glucose, producing H2O2 as a substrate for MnO2; this process amplifies O2 production and addresses significant challenges posed by hypoxic conditions within tumors. In studies involving 4T1 tumor-bearing mice, the HAMF group exhibited a notable cell death rate of 88% under normoxic conditions and even 72% under hypoxic conditions—demonstrating the profound efficacy of PDT enhanced by this novel formulation. Transitioning from PDT to PTT, the latter approach involves the targeted irradiation of photothermal agents with light to induce localized heating, effectively leading to tumor cell destruction.170 Yin et al. have achieved notable progress in this field by developing an smart nanoplatform, Gd2O3@Ir/TMB-RVG29 (G@IT-R), which integrates Ir nanozymes with the well-established photothermal agent TMB.173 The Gd2O3 nanodisks within this formulation not only facilitate heat generation but also inhibit autophagy, thereby enhancing PTT efficacy specifically in gliomas.

Furthermore, the enzyme-like characteristics of nanozymes can be integrated with PDT and PTT to develop a photoresponsive nanocatalytic therapeutic platform that incorporates a photosensitizer, a photothermal agent, and a nanozyme. Yang et al. employed hollow nitrogen-doped carbon nanospheres (HNCSs) loaded with iron phthalocyanine (FePc) to construct a versatile nanoparticle platform (FePc/HNCSs) for synergistic dual phototherapy.174 This innovative combination resulted in enhanced catalytic activity; upon exposure to an 808 nm laser, FePc/HNCSs significantly converted endogenous H2O2 into highly toxic ˙OH, while simultaneously decomposing H2O2 to release O2. The increased O2 availability further augmented PDT efficacy; in experiments with 4T1 breast cancer cells, this platform showed a notable tumor suppression rate of 96.3%, highlighting the potent synergistic therapeutic effects achieved through combined catalytic therapy and dual phototherapy. Continuing the exploration of synergistic strategies, Xu et al. addressed the limitations associated with CuCo2S4 nanoparticles, which have traditionally been regarded as promising agents for PTT.175 They developed ultrasmall CuCo2S4–Pt–PEG nanocomposites that integrate PTT, PDT, and nanozyme catalytic activity. The CuCo2S4–Pt–PEG formulation demonstrated exceptional photothermal performance when exposed to 1064 nm laser treatment at low power density. Concurrently, the catalytic activity of platinum nanozymes significantly enhanced O2 production, thereby amplifying the PDT effect. This multifaceted approach not only effectively targeted cancer cells but also triggered antitumor immune responses to inhibit metastasis, further underscoring the therapeutic potential of integrated PTT/PDT/enzyme-catalyzed strategies.

4.3.2. Chemotherapy. Chemotherapy is a widely employed and effective treatment modality for cancer, utilizing specific antineoplastic pharmacological agents to eliminate malignant cells.176 These chemotherapeutic agents are typically administered systemically, facilitating rapid distribution throughout the body via the bloodstream.177 The primary advantage of this administration method is its ability to target disseminated cancer cells across multiple sites, especially in metastatic cases, thereby effectively inhibiting or eliminating these neoplastic cells.178 A diverse array of chemotherapy drugs is available, predominantly classified as cytotoxic agents. These drugs are specifically designed to induce cell death by disrupting cell division and proliferation. However, it is important to note that these agents lack selectivity within the body; they tend to affect rapidly dividing normal cells as much as, or even more than, malignant cells.177

To enhance the efficacy of chemotherapy, researchers are increasingly investigating the synergistic combination of chemotherapy with nanozyme-catalyzed therapy, leading to more targeted therapeutic strategies. For instance, Li et al. developed innovative nanomedicines termed AgPd@BSA/DOX, which comprise silver–palladium bimetallic nanoparticles serving as drug carriers.179 These nanoparticles were coated with bovine serum albumin (BSA) and loaded with the chemotherapeutic agent DOX. Notably, the AgPd nanoparticles exhibited a superior photothermal conversion efficiency (η = 40.97%) and significantly enhanced POD-like activity compared to their uncoated silver nanoparticle counterparts. This combination enabled AgPd@BSA/DOX to effectively catalyze endogenous H2O2 into ˙OH under NIR laser irradiation, thereby inducing PTT while concurrently releasing DOX. In vivo studies in U14 tumor-bearing mice demonstrated a notable inhibition rate of 98% in the “AgPd@BSA/DOX + laser” group. These findings highlight the remarkable antitumor efficacy of nanomaterials, achieving a sophisticated integration of catalytic therapy, PTT, and chemotherapy. Building upon the principles established by Li et al., Zhang et al. further advanced the field by designing and synthesizing innovative nanomedicines known as PANI/PPy@Au@MnO2 (PPAuMns).180 This agent was developed through the in situ deposition of Au NPs onto the surface of polyaniline (PANI) and PPy nanocomposites, followed by the reduction of KMnO4. In addition to its structural sophistication, PPAuMns was engineered to encapsulate and modify the chemotherapeutic agent DOX in conjunction with folic acid (FA), resulting in the formation of DOX-loaded PPAuMn@FA. The high photothermal conversion efficiency exhibited by both PANI and PPy significantly enhanced the efficacy of PTT. Moreover, the hollow architecture of PPAuMns facilitated targeted pH-responsive drug release, thereby enabling a strategic delivery mechanism. GPx-like and POD-like enzymatic activities played a crucial role in depleting GSH while catalyzing the breakdown of H2O2 into O2, effectively alleviating tumor hypoxia.

5. Nanozyme-enabled precision diagnostics

Tumor markers are defined as substances synthesized and released by tumor cells or produced by the body in response to tumor cells.181 The detection of tumor markers using chemical analysis, immunological assays, and genomic sequencing is of great value for early tumor diagnosis, monitoring the effectiveness of treatment, detecting recurrence, and evaluating prognosis after disease progression.182 Nanozymes, a novel type of artificial enzyme, exhibit catalytic activity similar to enzymes and have unique physicochemical properties such as photothermal characteristics, superparamagnetic properties, and fluorescence, that are intrinsic to nanomaterials.183 These unique features provide the potential for utilizing nanozymes in various applications, especially in in vivo monitoring and disease imaging (Fig. 5).
image file: d5mh01000d-f5.tif
Fig. 5 Schematic representation of nanozyme monitoring and disease imaging in vivo.

Nanozymes integrate catalytic activity with diagnostic characteristics. They amplify signals through enzymatic reactions, such as the oxidation of POD-like substrates, thereby enhancing colorimetric or fluorescent signals.58 In contrast, traditional contrast agents generally rely solely on passive signal enhancement without such amplification mechanisms.184 They can perform multimodal imaging within a single nanozyme entity. For example, it is possible to integrate magnetic MRI, CT, and PAI.185 However, traditional contrast agents are typically restricted to a single imaging modality, necessitating separate administrations for a comprehensive diagnosis.186 In addition, due to surface modification techniques such as PEGylation, nanozymes generally possess better biocompatibility and longer blood circulation times.58 This effectively addresses issues associated with traditional contrast agents, such as the rapid clearance from the body or toxicity problems. For example, some ionic contrast agents used in CT and gadolinium-based MRI contrast agents, which may cause nephrogenic systemic fibrosis, have limitations.187 In comparison, manganese-based or iron oxide-based nanozymes not only provide comparable or even superior contrast enhancement but also exhibit intrinsic catalytic activity.188 This catalytic activity can be exploited for therapeutic applications, thus realizing the integration of diagnosis and treatment. Combining tumor marker detection with nanozyme characteristics offers a promising approach for developing novel early tumor diagnostic strategies. This information is presented objectively and impartially and is intended to serve as a reference for related research and clinical applications.

5.1. Enzyme-like activity-based diagnostic probes

Nanozymes have revolutionized cancer diagnostics by enabling ultrasensitive, multiplexed detection of tumor-derived biomarkers such as ctDNA, CTCs, and extracellular vesicles (EVs).56 These probes leverage nanozyme catalytic activities to amplify biomarker signals, overcome biological noise in complex matrices, and achieve unprecedented precision for early diagnosis and therapeutic monitoring.58

CtDNA, carrying tumor-specific mutations, serves as a critical biomarker for non-invasive cancer screening. Li et al. engineered a photoelectrochemical (PEC) biosensor using Co3O4 nanozymes to achieve triple-signal quenching mechanism for ctDNA detection.189 By integrating enzyme-free target recycling amplification with the POD-like activity of Co3O4, the system generated insoluble 3-amino-9-ethylcarbazole (AEC) deposits that suppressed MgIn2S4 photoelectric response through competitive light absorption, electron transfer blocking, and hindered ascorbic acid donation. This approach achieved a detection limit of 0.15 fM and a linear range of 0.4 fM–400 pM in human serum, with recoveries of 97–103% (RSD ≤ 3.5%), demonstrating robust clinical applicability for liquid biopsies.

While ctDNA provides genetic insights, CTCs offer direct evidence of metastatic potential. Li et al. addressed CTC detection challenges through a trimetallic AuIrPt nanozyme-based electrochemical cytosensor.190 The AuIrPt nanozymes exhibited multi-enzymatic activities (SOD, POD, CAT) and amplified signals for CTCs captured via a triple-site recognition strategy (anti-mucin 1 (MUC1), anti-epidermal growth factor receptor (EGFR), and epithelial cell adhesion molecule (EpCAM) aptamers). This system achieved a detection limit of 2 cells per mL in whole blood with 90.76–106.4% recovery, minimizing false positives by requiring concurrent antigen expression.

Beyond CTCs, tumor-derived extracellular EVs, including exosomes, carry proteins and nucleic acids critical for cancer subtyping. Gong et al. designed a dual-mode electrochemical/colorimetric sensor using MoS2–Au@Pt nanozymes for exosome analysis.191 The core–shell Au@Pt nanoparticles catalyzed TMB oxidation, generating electrochemical and colorimetric signals, while anti-CD63 aptamers ensured specific exosome capture. The platform achieved detection limits of 9.3 particles per mL (electrochemical) and 4.2 × 103 particles per mL (colorimetric), with 93–106% recovery in clinical serum samples.

5.2. Physicochemical property-driven multimodal imaging

Due to their unique physicochemical characteristics, nanozymes open up innovative technological possibilities for in vivo monitoring and disease imaging (Table 3). For instance, their superparamagnetic properties enable controllability under an external magnetic field, facilitating precise localization and tracking of these nanosystems.192 This capability is particularly valuable for applications requiring real-time tracking of therapeutic agents in vivo. In addition to magnetism, the fluorescence properties of nanozymes enable the observation of biochemical reactions in cells and pathological changes in tissues through the detection of fluorescent signals.193 This optical characteristic not only enhances our understanding of cellular processes but also aids in visualizing disease states, providing a complementary approach to monitoring biological activities. Moreover, the photothermal properties of nanozymes facilitate heat generation when exposed to specific wavelengths of light. This feature enables targeted photothermal ablation strategies that selectively destroy pathological tissues while sparing healthy ones.194 Collectively, these physicochemical properties offer valuable insights into early disease diagnosis and treatment. They empower healthcare professionals to perform real-time monitoring of disease progression and evaluate treatment efficacy, ultimately enhancing the precision and effectiveness of medical interventions.
Table 3 Nanozymes for cancer imaging
Nanozymes Activities Imaging modalities Factors of targeted imaging Ref.
Pt–CuS Janus CAT PA 808 nm laser irradiation 195
AMP NRs POD PA TME 196
Ag2S@Fe2C-DSPE-PEG-iRGD POD MRI/FI PEG iRGD peptide 197
IL@MIL-101(Fe)@BSA-AuNCs POD MRI/FI BSA-Au NCs and MIL-101(Fe) NPs 198
APMN NPs POD/CAT MRI/PA Au@Pd core 199
FHNPs POD/CAT CT Heat-induced radiolabeling strategy 200
FeWOx NSs POD PA/MRI/CT TMB and 780 nm laser irradiation 201


5.2.1. Computed tomography imaging (CT). CT is an advanced medical imaging modality that employs precisely collimated X-ray beams (not gamma rays or ultrasound) in conjunction with highly sensitive detectors to generate clear and detailed representations of the human body. This powerful tool plays a pivotal role in diagnosing a wide array of diseases. It is noteworthy that in recent years, there has been an increasing interest in the potential integration of nanozymes with CT. Nanozymes are distinguished by their unique physical and chemical properties, which position them as promising candidates for use as CT contrast agents to enhance imaging capabilities. A prominent example of this innovation is the work conducted by Dong et al., who developed a versatile PEG/Ce–Bi@DMSN nanozyme. This was achieved by coating uniform Bi2S3 nanorods onto dendritic mesoporous silica nanoparticles (DMSN) coated with Bi2S3 nanorods (Bi2S3@DMSN), followed by modification with ultra-small cerium dioxide nanozymes.202 This innovative design leverages the high atomic number of elemental bismuth (Bi) and its exceptional X-ray attenuation coefficient, providing a robust foundation for superior CT imaging performance. The study carried out successfully demonstrated the feasibility of utilizing the PEG/Ce–Bi@DMSN nanozyme as an in vivo CT contrast agent through intratumoral injection. The results revealed excellent CT imaging effects, highlighting effective accumulation within tumor regions. This efficacy can be attributed to the EPR effect, which facilitates localized imaging and underscores the potential for nanozymes to revolutionize traditional imaging techniques. Thus, the combination of nanozymes with CT presents exciting prospects for advancing diagnostic imaging and improving patient outcomes.
5.2.2. Magnetic resonance imaging (MRI). MRI is a sophisticated medical imaging technology that operates based on the principles of nuclear magnetic resonance (NMR). This technique offers exceptional diagnostic capabilities for various organs, including the brain, thyroid, liver, gallbladder, spleen, kidneys, pancreas, adrenal glands, uterus, ovaries, prostate, as well as the heart and major blood vessels. When compared to other medical imaging modalities, MRI distinguishes itself through numerous advantages: it provides multiple imaging sequences and parameters, rapid scanning speeds, high tissue resolution, and generates clear images.203 These attributes enable healthcare professionals to detect early lesions that may be difficult to identify with other modalities. Consequently, MRI serves as an invaluable tool for the early screening of tumors, cardiovascular diseases, and cerebrovascular conditions.

Given the promising potential of MRI in clinical applications, researchers have proposed that the distinctive physical and chemical properties of nanozymes could further enhance MRI functionality, particularly as prospective contrast agents. A notable investigation in this domain was conducted by Wang et al., who adeptly employed monatomic ruthenium as the active catalytic site anchored within the metal–organic framework Mn3[Co(CN)6]2.204 By encapsulating chlorin e6 (Ce6), they developed a nanoprobe referred to as OxgeMCC-r single-atom enzyme (SAE). The unique coordination of Mn with six nitrogen atoms forms a high-spin Mn–N6 species (S = 5/2), enabling OxgeMCC-r SAE to function effectively as an MRI contrast agent. The efficacy of OxgeMCC-r SAE was validated through studies involving subcutaneous tumor models, where it demonstrated a concentration-dependent signal enhancement effect alongside superior longitudinal relaxation rates. Notably, an increase in imaging intensity was observed with prolonged incubation time of 4T1 cells. This behavior underscored the accumulation of OxgeMCC-r SAE at tumor sites in a time-dependent manner, ultimately suggesting its long-term imaging capabilities and representing a valuable asset for guiding in vivo therapeutic interventions. In addition to these findings, the potential of nanozymes can be further optimized when integrated with MRI probes. A significant contribution to this field was made by Zhu et al., who developed a nanoplatform consisting of Cu/Mn chalcogenide nanoflowers (CMC NFs) in conjunction with 19F-labeled MRI probes.205 Under TME conditions, the paramagnetic Mn from CMC NFs specifically activates the 19F MRI signal by mitigating the paramagnetic relaxation enhancement (PRE) effect experienced by the 19F nuclei. The experimental results demonstrated a marked enhancement of the 19F MRI signal at the tumor site compared to healthy tissue within the same mice, which gradually diminished over time, thereby underscoring the specificity of this response. This study confirmed that CMC NFs activate 19F MRI capabilities, highlighting their excellent potential for tumor-specific imaging. Collectively, these advancements emphasize the transformative role that nanozymes can play in enhancing MRI technology and improving diagnostic outcomes.

5.2.3. Photoacoustic imaging (PA). PA is a non-invasive, ionizing radiation-free biomedical imaging technique that has been developed rapidly in recent years. The principle of this imaging method is that when biological tissues are illuminated by a pulsed laser, the light-absorbing components within the tissues will produce ultrasonic signals.206 These ultrasonic signals generated by light excitation are called photoacoustic signals, and they carry a wealth of information about the light absorption properties of tissues. By detecting these photoacoustic signals, researchers can reconstruct the distribution of light absorption within tissues and visualize their composition.206

In exploring new PA contrast agents, POD-like nanozymes combined with TMB, the most commonly used color developing substrate, can effectively excite photoacoustic signals. This combination not only provides the possibility to enhance the contrast of PA imaging, but also opens new avenues for tumor-specific imaging applications. Ma et al. developed a TMB/MOF/Pt Au-PEG nanoreactor (TMPAs), which is constructed by loading TMB and ultra-small PtAu nanozyme into a MOF of a modified PEG protective layer.207 TMPAs exhibit enzyme-like properties and are able to oxidize colorless TMB to positively charged TMB oxide, thus achieving broadband NIR absorption, enabling tumor-specific PA imaging and photothermal tumor ablation. In addition, the experimental results show that the increase of TMPAs concentration can enhance the photoacoustic signal, and there is a good linear relationship. This finding highlights the potential of TMPAs as a contrast agent for practical applications. Finally, real-time in vivo PA imaging after injection through the tail vein can effectively determine the optimal laser irradiation time, thereby avoiding damage to the surrounding normal tissue. These research findings provide key support for the clinical development of PAI technology and offer new strategies for tumor diagnosis and treatment.

5.2.4. Multimodal imaging. Nanozymes have been demonstrated to exhibit high efficiency and prolonged catalytic activity.208 By modifying the nanostructures or altering the catalytic environment, nanozymes can display a wide range of biocatalytic activities.209 Furthermore, nanozymes offer an easier customization and design process, allowing for precise alignment with specific application requirements.210 Consequently, they leverage their inherent properties to enable multimodal imaging: when combined with various imaging modalities, they generate comprehensive signals with high sensitivity and spatial resolution, enabling effective detection of in vivo biological targets and processes.185 This technology holds significant potential for applications in fundamental biomedical research as well as clinical diagnostics.

In this context, the development of biocompatible and traceable SAzyme models featuring high catalytic activity alongside imaging capabilities is particularly crucial. Wang et al. successfully dispersed cobalt atoms on nanoporous TiO2 to obtain Co/TiO2 SAzymes exhibiting good intrinsic biocompatibility and stability.211 Utilizing Co/A-TiO2’s hollow nanoporous structures, they further incorporated the 19F MRI contrast agent perfluoro-15-crown-5-ether (PFCE), resulting in PFCE@Co/A-TiO2 nanocomposites. Additionally, they employed Co/A-TiO2 SAzymes labeled with indocyanine green (ICG) to monitor the dynamic biological distribution through fluorescence and dual-mode fluorescence/19F MRI. In vivo experiments revealed that following intravenous injection, both fluorescence and 19F MRI signals within tumor regions gradually intensified. This observation indicates that the hollow nanoporous structure of Co/A-TiO2 SAzymes can effectively load anticancer drugs and contrast agents, facilitating multimodal image-guided synergistic chemotherapy for tumors.

Similarly, mixed bimetallic nanomaterials are preferred over monometallic nanoparticles due to their superior physicochemical properties. Jia et al. developed a dual-modal superbranched AgPd blackbody (AgPd PB) nanozyme.212 Owing to their high atomic number and strong X-ray attenuation capability, the AgPd PB nanozymes significantly enhanced CT signals at tumor sites compared to the control group. Additionally, rhodamine B (RB) was conjugated with the AgPd PB nanozyme for fluorescence tracking purposes. Subsequent studies showed that after intravenous injection of RB-stained AgPd PB nanozymes, their accumulation in mouse tumors increased markedly, consistent with the EPR effect. Concurrently, AgPd PB exhibited high photothermal conversion efficiency. The PA imaging results of tumors were consistent with the fluorescence findings in vivo; collectively, these results underscore the potential of AgPd nanozymes as multifunctional contrast agents. In a similar vein, Wang et al. synthesized Au2Pt–PEG–Ce6 nanozymes by covalently linking the photosensitizer Ce6 with Au2Pt nanozymes.213 The strong absorption characteristics of Au2Pt–PEG–Ce6 in the NIR region facilitated both PA and photothermal (PT) imaging capabilities to guide PTT. Simultaneously, the exceptional X-ray attenuation properties inherent to gold and platinum enabled these Au2Pt–PEG–Ce6 nanozymes to serve as effective contrast agents for X-ray CT imaging. Consequently, Au2Pt–PEG–Ce6 holds promise as a contrast agent for developing tri-modal CT/PA/PT imaging.

In addition, carbon-based nanomaterials have garnered significant attention due to their remarkable stability, low production costs, straightforward synthesis and modification methods, as well as favorable biocompatibility.209 Notably, heteroatom doping can effectively optimize the electronic structure of the active sites, thereby enhancing the catalytic activity of carbon materials and potentially improving imaging capabilities. Zheng et al. developed a hydrated silicate carbon-based nanocapsule (HSC-2) that leverages the highly efficient adsorption properties of nanobeads.214 By adjusting the silicon–carbon ratio within its framework, HSC-2 demonstrated superior performance in NIR-II photoacoustic/fluorescence dual-modal imaging while also achieving effective tumor PTT within the NIR-II window. In a 4T1 tumor model, both PA imaging and fluorescence signals from NSC-2 in the tumor region progressively enhanced, indicating its excellent passive tumor targeting and effective intratumoral accumulation.

6. Closed-loop theranostic systems

The closed-loop theranostic system is an integrated platform that continuously monitors treatment responses and uses feedback mechanisms to adjust adaptive therapeutic interventions, forming a self-regulating cycle. This core feature of real-time feedback and dynamic modulation sets them apart from traditional multimodal therapies, which typically combine multiple treatment modalities such as chemotherapy with phototherapy in a preprogrammed, non-adaptive manner without continuous monitoring of real-time biological responses. Specifically, closed-loop systems leverage nanozymes’ unique ability to simultaneously act as therapeutic agents and diagnostic probes. For example, a nanozyme may generate cytotoxic ROS for therapy while emitting imaging signals proportional to tumor oxidative stress levels, allowing clinicians to assess treatment efficacy in real time.215 If the signal indicates an insufficient response, the system can autonomously amplify catalytic activity via NIR-triggered enhancement of POD-like activity or release additional therapeutic payloads, ensuring optimal therapeutic outcomes. In contrast, traditional multimodal strategies rely on fixed combinations of treatments, with adjustments made only based on delayed, external evaluations such as post-treatment imaging or biomarker assays rather than real-time, in situ feedback.

CDT efficacy is often limited by fluctuating H2O2 levels and tumor heterogeneity.216 Zhang et al. engineered ROS-responsive Fe3O4-based nanoparticles (FGTL) integrating GOx and immunomodulatory Tuftsin.217 The system disassembles in H2O2-rich TMEs, releasing GOx to amplify Fenton reactions for enhanced ferroptosis, while Tuftsin polarizes immunosuppressive M2 macrophages to antitumor M1 phenotypes and activates cytotoxic T cells. Real-time 129Xe MRI tracked therapeutic efficacy by mapping restored lung ventilation and reduced alveolar septal thickness in murine lung metastasis models. This dual-function platform achieved significant tumor suppression while providing non-invasive assessment of treatment response, highlighting the potential of MRI-guided feedback to optimize CDT-immunotherapy synergy.

CDT leverages ROS dynamics as an intrinsic biological readout, allowing the system to self-regulate catalytic activity in response to changes in oxidative stress levels within the tumor microenvironment.216 In contrast, phototherapy, which depends on external light stimuli, requires precise spatiotemporal control of light delivery to ensure that therapeutic activation aligns with real-time imaging feedback, such as tumor localization or response markers.218 Liu et al. developed core/shell Au@Cu2S nanocrystals encapsulated in denatured bovine serum albumin (dBSA) for optical coherence tomography (OCT)-guided phototherapy.219 The nanocrystals exhibited strong NIR absorption and low cytotoxicity. In vivo OCT imaging revealed time-dependent tumor accumulation, with peak intratumoral signals at 20 minutes post-injection, enabling spatiotemporal control of light delivery. The dBSA coating ensured colloidal stability and enhanced tumor penetration, as confirmed by confocal microscopy. This work underscores the potential of OCT-guided systems to personalize phototherapy dosing, minimizing collateral damage while maximizing tumor ablation.

7. Nanozymes in clinical trials

The introduction of nanozymes has illuminated the biological potential of inorganic nanomaterials, demonstrating their ability to catalyze substrates similar to natural enzymes under physiological conditions through mechanisms and kinetics closely resembling those of their natural counterparts.220 These engineered nanozymes present a distinct set of advantages over traditional enzymes, including enhanced catalytic activity, cost-effectiveness, exceptional stability, ease of mass production, and tunable catalytic activities.58 Furthermore, as a novel category of artificial enzymes, nanozymes not only exhibit enzyme-like catalytic properties but also possess unique physicochemical characteristics such as photothermal effects, superparamagnetism, and fluorescence. The therapeutic potential of nanozymes has been evidenced in numerous animal studies, but the application of these in clinical settings is still relatively rare.183 As a point of reference, FDA-approved IONPs, such as Resovist (Ferucarbotran), have undergone evaluation in clinical trials and have shown promise in in vivo monitoring and disease imaging due to their exceptional physicochemical properties. For example, determining the status of sentinel lymph nodes (SLN) is crucial for devising appropriate treatment strategies for breast cancer patients.221 Currently, the standard procedure for SLN detection employs a dual technique involving technetium 99m (Tc99) and blue dye (BD).222 However, studies have demonstrated that superparamagnetic IONPs can serve as equally reliable alternatives.223 Furthermore, Resovist (Ferucarbotran) has the unique ability to label specific cells within the body, allowing for real-time imaging of their natural movements in vivo.224 This capacity is particularly beneficial in the context of stem cell therapy, where non-invasive monitoring of transplanted cells is essential for tracking their biodistribution and biological functions.225 While Resovist (ferucarbotran)’s primary application remains MRI imaging, its iron oxide core demonstrates POD-like properties exploitable for future theranostic designs.226–228

As nanozymes have advanced from preclinical research to early-stage clinical evaluation, their potential to integrate enzyme mimicry with material-based intelligent properties in cancer theranostics has increasingly attracted attention, though translating these innovations into clinical practice presents unique challenges. First, biocompatibility remains a critical concern. While nanozymes like IONPs have shown promise in preclinical studies, their long-term accumulation in organs such as the liver and spleen can trigger immune responses.229 Additionally, surface modifications such as PEGylation intended to improve circulation can sometimes elicit anti-PEG antibodies, reducing efficacy over repeated administrations.230 This challenge has been observed in trials of PEGylated cerium oxide nanozymes for radioprotection. Second, large-scale manufacturing faces significant challenges. The synthesis of single-atom nanozymes, which exhibit high catalytic specificity, requires precise control over atomic dispersion.231 Similarly, metal–organic framework-based nanozymes, while versatile, face scalability issues due to their sensitivity to reaction conditions.232 This results in high production costs that hinder widespread clinical adoption. Third, regulatory challenges persist, particularly in defining standardized toxicity evaluation metrics for nanozymes, which differ from small-molecule drugs.233

8. Conclusions and outlooks

This review highlights the transformative potential of nanozymes as a cutting-edge and versatile platform in biomedicine. By highlighting their unique enzyme-like properties, physicochemical characteristics, tunable catalytic activity, and inherent biocompatibility, we illustrate their promising applications across a spectrum of fields, from cancer therapy to tumor imaging. As research in nanomaterials continues to evolve, the exploration of synergies with traditional therapies and the integration of nanozymes into innovative diagnostic platforms herald significant advancements in precision medicine. This review also delves into the fundamental mechanisms underlying nanozyme function and therapeutic effects, emphasizing the necessity for sustained interdisciplinary collaboration and innovative strategies to unlock their full potential for enhancing human health and well-being. Advancements in synthetic technology have significantly enhanced the diverse properties of nanozymes, driving the development of a wide range of materials.

Nonetheless, several challenges must be addressed to realize the full potential of nanozymes in cancer treatment. These include optimizing biocompatibility and stability within complex biological environments, mitigating off-target effects, and ensuring precise control over controlled therapeutic payload release dynamics.79 Additionally, thorough evaluations of safety, efficacy, and long-term effects are crucial for transitioning these therapies from preclinical studies to clinical applications.234 Looking to the future, the potential of nanozymes is poised to expand even further, opening up numerous avenues for advancements in cancer diagnosis and treatment. Future research should prioritize enhancing the catalytic efficiency and specificity of nanozymes, while also developing novel diagnostic techniques that leverage nanozyme technology. Notably, AI-driven knowledge bases enable transparent prediction of nanozymes’ multiple catalytic activities by integrating multi-source data on material properties, catalytic mechanisms, and environmental factors, allowing researchers to identify structure–activity relationships that guide the design of multifunctional nanozymes with tailored POD-, CAT-, or SOD-like activities.235 Additionally, machine learning models have been trained on large datasets to predict catalytic efficiency, substrate specificity, and stability under physiological conditions.236 Moreover, exploring the possibilities of personalized medicine through tailored nanozyme-based treatments could revolutionize patient care. The combination of nanozymes with other nanomaterials or therapeutic agents is expected to yield remarkable therapeutic synergies, thereby significantly improving treatment outcomes. This review not only provides a comprehensive overview of the current state of nanozymes but also emphasizes the critical need to address existing challenges. By doing so, we can fully harness the transformative power of nanozymes in advancing cancer diagnosis and treatment, paving the way for innovative approaches in the future of biomedicine.

Conflicts of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Data availability

This review did not generate any new data or original data.

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 82204317), the Excellent Youth Science Foundation of Liaoning Province (2024JH3/10200046) and the Basic Scientific Research Project of Liaoning Provincial Department of Education (No. LJ212410163015).

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Footnote

These authors contributed equally to this work.

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