Cellular free radical generation systems and reactive oxygen species targets (ROS generation and targets)

Cellular free radical generation systems and reactive oxygen species (ROS) targets encompass the enzymatic and organellar sources of ROS and the downstream biomolecules they modify. Primary generation systems include the mitochondrial electron transport chain, NADPH oxidases (NOX), xanthine oxidase, and cytochrome P450 enzymes, which produce species like superoxide and hydrogen peroxide as byproducts of metabolism or for signaling [3, 5]. These ROS act as critical second messengers at low concentrations but cause oxidative damage to DNA, lipids, and proteins when produced in excess, a state known as oxidative stress [2, 4]. In disease contexts such as cancer, neurodegeneration, and chronic inflammation, overactive ROS generation drives cellular dysfunction and death [1, 3]. Therapeutic strategies involve inhibiting specific ROS-producing enzymes or utilizing antioxidants to scavenge radicals and protect cellular targets from oxidative deterioration [3, 5].

Other names

Pro-oxidant systemsRedox signaling pathwaysOxidative stress mediatorsROS-producing enzymesReactive oxygen species metabolic process

Inhibition of ROS-producing enzymes (e.g., NOX, XO), scavenging of reactive oxygen species, and induction of endogenous antioxidant defenses via the Nrf2 pathway.