Cellular oxidative stress machinery

The cellular oxidative stress machinery is an integrated network of enzymes, small molecules, and signaling pathways dedicated to maintaining redox homeostasis and protecting the cell from oxidative damage (Sies et al., 2017, Nature Reviews Molecular Cell Biology). Key enzymatic components include superoxide dismutase (SOD), catalase, and the glutathione peroxidase (GPx) family, which work in concert to neutralize reactive oxygen species (ROS) generated during aerobic metabolism (Halliwell & Gutteridge, 2015, Free Radicals in Biology and Medicine). The system is primarily regulated by the Keap1-Nrf2 signaling axis, where the transcription factor Nrf2 (Nuclear factor erythroid 2-related factor 2) orchestrates the expression of numerous cytoprotective genes in response to oxidative triggers (He et al., 2020, Signal Transduction and Targeted Therapy). Chronic failure or overwhelm of this machinery leads to oxidative stress, a pathological state implicated in the progression of neurodegenerative diseases, cardiovascular disorders, and cancer (Forman & Zhang, 2021, Nature Reviews Drug Discovery). Therapeutic strategies often focus on enhancing the activity of this machinery through Nrf2 activators like dimethyl fumarate or providing exogenous antioxidant support (Robledinos-Antón et al., 2019, Antioxidants). However, because ROS also function as essential signaling molecules, excessive suppression can interfere with normal physiological processes or potentially promote the survival of malignant cells (Hayes et al., 2020, Trends in Pharmacological Sciences).

Other names

Antioxidant defense systemRedox homeostasis machineryOxidative stress response networkCellular antioxidant system

Activation of the Nrf2-Keap1 signaling pathway to induce antioxidant response element (ARE)-driven gene expression; direct scavenging of reactive oxygen species (ROS); replenishment of endogenous antioxidant stores such as glutathione; mimicry of antioxidant enzyme activity.