superoxide dismutase

Overview

Superoxide dismutase (SOD) is a family of metalloenzymes that serves as a primary enzymatic antioxidant defense in virtually all aerobic organisms. SOD catalyzes the dismutation of the superoxide radical anion (O₂•⁻) into molecular oxygen and hydrogen peroxide, which is subsequently neutralized by catalase or glutathione peroxidase. Three major isoforms exist in mammals: the cytoplasmic copper/zinc-containing SOD1, the mitochondrial manganese-containing SOD2, and the extracellular SOD3. By controlling superoxide levels, SOD plays an indispensable role in maintaining redox homeostasis, protecting cellular membranes, proteins, and nucleic acids from oxidative damage. Its activity is routinely used as a surrogate biomarker of the overall antioxidant capacity of tissues and biological fluids.

Beyond its canonical enzymatic role, SOD activity has been co-opted in biomedical engineering as the conceptual template for a broad class of synthetic antioxidant nanomaterials known as nanozymes—nanostructured materials that mimic SOD's catalytic mechanism. The enzyme functions in concert with catalase (CAT), glutathione peroxidase (GPx), and non-enzymatic antioxidants such as glutathione to constitute a tiered, integrated defense against reactive oxygen species (ROS). Dysregulation of SOD activity is implicated in a wide spectrum of pathologies including diabetes mellitus, neurodegeneration, sepsis-associated organ injury, cardiovascular disease, and chronic inflammatory disorders, making it a critical molecular target in translational research.

Focus of Latest Publications

Recent publications have examined superoxide dismutase (SOD) primarily as part of oxidative-stress–modulating strategies across diverse disease and biomaterial contexts. Several studies evaluated interventions with SOD-mimicking or SOD-related activity, including cerium oxide nanozymes for cataract, catechol-zinc nano-enzymes in an amylase-responsive oral ulcer film, hollow MnO2 nanozymes in an injectable hydrogel for intrauterine adhesion, and an all-natural hydrogel with GAO/CAT-mediated redox modulation. In these settings, SOD activity was linked to reactive oxygen species scavenging, often alongside catalase-like effects, to support tissue protection and repair.

In ophthalmic and reproductive tissue models, SOD-mimetic systems were reported to reduce oxidative injury and improve outcomes. Cerium oxide nanozymes were described as mimicking SOD and catalase through a Ce3+/Ce4+ redox cycle, with repeatable ROS scavenging in vitro and reduced lens turbidity, improved lens fiber integrity, and decreased apoptosis in UV-induced rat cataracts. Similarly, MnO2@E2 nanoparticles in a hyaluronic acid hydrogel showed SOD-like and catalase-like activity, scavenged ROS, protected human endometrial stromal cells, and promoted endometrial repair in a rat injury model. The GAO/CAT-integrated hydrogel was also reported to exhibit SOD-like activity and, together with catalase, to scavenge ROS/RNS in human osteoarthritis synovial fluid, supporting cartilage regeneration in mice.

Other studies used SOD as a biomarker or mechanistic readout of oxidative balance. In monozygotic twins discordant for pain-related temporomandibular disorder, plasma SOD was measured alongside inflammatory and matrix-remodeling markers, and painful TMD was associated with altered oxidative indices, including the MDA/SOD ratio. In hypertension-related functional bread studies, increased SOD activity accompanied reduced reactive oxygen species and malondialdehyde levels, consistent with improved antioxidant defense. In a cognitive dysfunction study in diabetic rats, empagliflozin and dapagliflozin were assessed in silico against SOD among other targets, and both drugs increased brain SOD levels in vivo while improving behavioral performance.

A separate antibacterial study also implicated SOD inhibition as part of a pro-oxidant antimicrobial mechanism. A garlic-derived disulfide compound was reported to inhibit both catalase and SOD activities in Erwinia amylovora, causing lethal ROS accumulation, cell envelope damage, and reduced virulence. Overall, these recent publications position SOD as a recurring node in oxidative-stress regulation, either as a therapeutic mimic to enhance ROS clearance or as a target whose inhibition contributes to antimicrobial activity.

Key Publications

• Jun Design, Synthesis, Antibacterial Evaluation, and Mechanistic Insights of Garlic-Derived Disulfides against Erwinia amylovora. (Journal of agricultural and food chemistry, 2026, PMID 42246960): "Mechanistically, b triggered lethal ROS accumulation by inhibiting catalase (CAT) and superoxide dismutase (SOD) activities, leading to compromised cell envelope and ultrastructural damage in E. amylovora."
• May Inflammatory, oxidative, and neurotrophic profiles in monozygotic twins discordant for pain-related TMD. (Molecular biology reports, 2026, PMID 42132960): "Significant within-pair differences were identified in IL-6, IL-6/IL-10 ratio, MDA/SOD ratio, MMP-9, TIMP-2, and BDNF levels."
• Jun A regenerative cerium oxide nanozyme for cataract treatment via oxidative stress regulation. (Biomaterials science, 2026, PMID 42108912): "CNP mimic the activities of superoxide dismutase (SOD) and catalase (CAT) through a dynamic Ce3+/Ce4+ redox cycle on their surface."
• May Multienzyme-Mediated Dynamic Cross-Linking of All-Natural Hydrogels with High Adhesion and Redox Modulation for Rapid Tissue Filling and Repair. (Journal of the American Chemical Society, 2026, PMID 42114044): "Furthermore, the GAO/CAT-integrated hydrogel demonstrates superoxide dismutase (SOD)-like activity and, together with CAT, enables the synergistic scavenging of reactive oxygen and nitrogen species (ROS/RNS) in human osteoarthritis (OA) synovial fluid, thereby promoting articular cartilage regeneration in an OA mouse model."
• May An amylase-responsive bilayer film for sustained enzyme delivery and ROS-scavenging therapy in oral ulcer treatment. (Journal of materials chemistry. B, 2026, PMID 41989817): "The film demonstrates dual-phase therapeutic action: effective scavenging of reactive oxygen species (ROS) via superoxide dismutase (SOD)-mimicking activity and modulation of inflammatory responses by promoting macrophage polarization from the pro-inflammatory (M1) to the anti-inflammatory (M2) phenotype."
• Apr Phenolic compounds and antihypertensive properties of Tiger nut (Cyperus esculentus) and Moringa (Moringa oleifera) enriched functional breads via nitric oxide restoration and arginase-ACE inhibition. (Food chemistry, 2026, PMID 41990495): "By increasing SOD activity and decreasing reactive oxygen species and malondialdehyde concentrations, they also improved antioxidant defense."
• May A hollow MnO2 nanozymes empowered injectable hydrogel for intrauterine adhesion therapy by alleviating oxidative stress and promoting endometrial repair. (Biomaterials science, 2026, PMID 41891313): "In vitro studies demonstrated that MnO2@E2 NPs exhibited catalase (CAT)-like and superoxide dismutase (SOD)-like enzymatic activities, effectively scavenging ROS."
• May Empagliflozin and dapagliflozin, sodium glucose cotransporter 2 inhibitors, may improve cognitive dysfunctions: in silico and in vivo findings. (Behavioural brain research, 2026, PMID 41819428): "...evaluating their in silico interactions with targets associated with oxidative stress, inflammation, and neuroprotection, including SGLT1, SGLT2, acetylcholinesterase (AChE), superoxide dismutase (SOD), receptor for advance glycation end-products (RAGE), and interleukin (IL)-1β."