Reactive oxygen species regulation and oxidative stress pathways (ROS regulation)

Oxidative stress pathways and reactive oxygen species (ROS) regulation comprise the integrated network of cellular mechanisms that maintain redox homeostasis [nih.gov, 2.2.1]. ROS, such as superoxide and hydrogen peroxide, are generated as metabolic byproducts or by specialized enzymes like NADPH oxidases (NOX) and serve as critical signaling molecules at low concentrations [nih.gov, 2.1.1]. However, an imbalance between ROS production and the cell's antioxidant capacity leads to oxidative stress, causing cumulative damage to DNA, proteins, and lipids [frontiersin.org, 2.2.3]. The primary regulatory axis is the Keap1-Nrf2-ARE pathway, which senses oxidative shifts and triggers the transcription of protective enzymes like superoxide dismutase (SOD) and catalase [nih.gov, 2.1.2]. Dysregulation of these pathways is implicated in a wide range of conditions, including neurodegeneration, cardiovascular disease, and cancer [researchgate.net, 2.2.1]. In cancer, ROS can promote tumorigenesis at moderate levels but induce apoptosis at high levels, making redox modulation a complex therapeutic strategy [jmchemsci.com, 2.2.4]. Therapeutic interventions focus on activating endogenous defenses (e.g., Nrf2 activators like bardoxolone methyl), inhibiting ROS sources (e.g., NOX inhibitors), or utilizing targeted antioxidants to mitigate tissue injury and restore cellular balance [wu.ac.th, 3.1.3]. Despite preclinical promise, many antioxidant therapies have faced challenges in clinical trials due to poor bioavailability and the dual nature of ROS in physiology [nih.gov, 2.2.1]. Modern approaches increasingly target specific mitochondrial sites or utilize enzyme mimetics to achieve more precise redox control [youtube.com, 2.2.5]. Overall, targeting ROS regulation remains a significant frontier in treating chronic inflammatory and degenerative diseases [jmchemsci.com, 2.2.4].

Other names

Redox homeostasisAntioxidant defense systemOxidative stress responseROS signalingReactive oxygen species metabolic process

Mechanisms include the activation of the Nrf2-Keap1-ARE signaling pathway to upregulate endogenous antioxidant enzymes, the inhibition of ROS-producing enzymes such as NADPH oxidases (NOX) and xanthine oxidase, the use of superoxide dismutase (SOD) and glutathione peroxidase (GPx) mimetics, and the direct scavenging of reactive species by compounds like N-acetylcysteine and vitamins C and E.