Diabetes-Induced Oxidative Stress in Experimental Models

Diabetes mellitus is characterised by chronic hyperglycaemia that provokes an overproduction of reactive oxygen species (ROS) and a concomitant weakening of endogenous antioxidant defences. In experimental models, administration of diabetogenic agents such as streptozotocin or alloxan selectively impairs pancreatic β-cells, recapitulating key aspects of human disease. Hyperglycaemia drives mitochondrial overproduction of superoxide anions and activates alternative metabolic pathways—including the polyol and hexosamine routes—that further elevate intracellular ROS levels. Excess oxidative stress induces lipid peroxidation, protein carbonylation and DNA damage, ultimately compromising cellular homeostasis. In rodents, redox imbalance is routinely assessed by measuring malondialdehyde, glutathione levels and activities of antioxidant enzymes such as superoxide dismutase and catalase. These assays provide quantitative insight into the extent of oxidative injury and the efficacy of candidate therapeutics. Beyond pancreatic dysfunction, oxidative stress contributes to common diabetic complications—nephropathy, retinopathy and neuropathy—via endothelial dysfunction and inflammatory activation. Experimental interventions often target the nuclear factor-erythroid 2-related factor 2 (Nrf2) pathway, which orchestrates the transcriptional response to oxidative challenge. By deploying genetic, pharmacological and nutraceutical approaches, investigators are elucidating the molecular interplay between hyperglycaemia, redox homeostasis and cellular resilience. Such studies offer a robust platform for preclinical evaluation of antioxidants, paving the way for translational strategies to mitigate diabetes-associated oxidative damage.

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Diabetes-Induced Oxidative Stress in Experimental Models publication trend

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Technical terms

Oxidative stress: An imbalance between the generation of reactive oxygen species and the capacity of antioxidant defences, leading to cellular damage.

Reactive oxygen species (ROS): Highly reactive molecules derived from oxygen, including superoxide anions, hydrogen peroxide and hydroxyl radicals.

Streptozotocin-induced diabetes model: An experimental approach in which streptozotocin selectively destroys pancreatic β-cells, mimicking type 1 diabetes.

Antioxidant enzymes: Endogenous proteins such as superoxide dismutase and catalase that catalyse the conversion of ROS into less reactive species.

Lipid peroxidation: The oxidative deterioration of polyunsaturated lipids in cell membranes, often measured by malondialdehyde levels.

References

1. Neuroprotective Efficacy of Europinidin in Streptozotocin‐Induced Memory Impairment by Modulation of Oxidative Stress, Inflammatory Mediators, and Cholinesterase Activity in Rats. Oxidative Medicine and Cellular Longevity (2023).
2. The role of lutein-rich purple sweet potato leaf extract on the amelioration of diabetic retinopathy in streptozotocin-induced Sprague–Dawley rats. Frontiers in Pharmacology (2023).
3. Globularia alypum Extracts Attenuate Hyperglycemia and Protect against Various Organ Toxicities in Alloxan‐Induced Experimental Diabetic Rats. Evidence-based Complementary and Alternative Medicine (2022).