Cellular reactive oxygen species defense pathways (ROS defense pathways)

Cellular reactive oxygen species (ROS) defense pathways are complex biochemical networks responsible for maintaining redox balance and mitigating the damaging effects of oxidative stress (Source: NIH, 2023). These pathways utilize a variety of enzymes, such as superoxide dismutase, catalase, and the glutathione system, alongside the master regulatory transcription factor Nrf2 to neutralize reactive molecules (Source: StatPearls, 2023). When these defenses are overwhelmed, the resulting oxidative damage to DNA, lipids, and proteins contributes significantly to the progression of chronic diseases, including Alzheimer's disease, atherosclerosis, and diabetes (Source: PubMed, 2022). Therapeutic strategies targeting these pathways typically involve the use of Nrf2 activators or antioxidant mimetics to bolster the cell's natural resilience. However, the role of these pathways in cancer is dualistic, as they can both prevent tumor initiation and promote the survival of established cancer cells by protecting them from metabolic stress. Consequently, drug development in this area requires careful modulation to avoid disrupting essential signaling processes or inadvertently supporting malignancy.

Other names

Antioxidant defense systemROS scavenging systemOxidative stress response pathwaysCellular redox regulatory network

Activation of the Nrf2-ARE signaling axis to induce antioxidant enzyme expression, direct scavenging of reactive oxygen species, and replenishment of endogenous antioxidant substrates like glutathione.