Free radical generation pathways

Free radical generation pathways refer to the diverse biochemical routes through which reactive oxygen species (ROS) and reactive nitrogen species (RNS) are produced within biological systems. These pathways include mitochondrial electron transport chain leakage, the activity of specialized enzymes such as NADPH oxidases (NOX), xanthine oxidase, and myeloperoxidase, as well as non-enzymatic processes like the Fenton and Haber-Weiss reactions (Lobo et al., 2010, Pharmacognosy Review). Under physiological conditions, these pathways are vital for cellular signaling, gene expression regulation, and the immune system's oxidative burst used to eliminate pathogens (Phaniendra et al., 2015, Indian Journal of Clinical Biochemistry). However, the dysregulation of these pathways leads to oxidative stress, which is implicated in the pathogenesis of cancer, neurodegenerative disorders like Alzheimer's, and cardiovascular diseases (Sies, 2017, Redox Biology). Pharmacological intervention typically targets specific enzymes within these pathways or employs antioxidant compounds to scavenge excess radicals, although broad-spectrum antioxidant therapy has faced challenges in clinical efficacy due to the disruption of essential redox signaling (Halliwell, 2011, British Journal of Pharmacology). Because this entry describes a broad set of biological processes rather than a single molecular target, it is classified as a pathway rather than a specific therapeutic receptor or enzyme.

Other names

Oxidative stress pathwaysReactive oxygen species (ROS) generationReactive nitrogen species (RNS) productionRedox signaling pathwaysPro-oxidant pathways

Inhibition of radical-producing enzymes (e.g., xanthine oxidase, NADPH oxidase), scavenging of reactive species, and chelation of catalytic metal ions to prevent the Fenton reaction.