Reactive oxygen species and membrane lipid radicals (ROS and lipid radicals)

Reactive oxygen species (ROS) and membrane lipid radicals are highly reactive chemical entities that play a dual role in cellular physiology, acting as both essential signaling molecules and mediators of oxidative damage. ROS, such as superoxide and hydrogen peroxide, are primarily generated as byproducts of mitochondrial respiration or by enzymes like NADPH oxidases, where they regulate processes like cell proliferation and immune responses (Sies & Jones, 2020, Nature Reviews Molecular Cell Biology). When the production of ROS exceeds the cell's antioxidant capacity, it leads to oxidative stress, which can trigger the peroxidation of polyunsaturated fatty acids in cellular membranes, forming lipid peroxyl and alkoxyl radicals (Stockwell, 2022, Cell). This chain reaction of lipid peroxidation is a defining feature of ferroptosis, a regulated form of cell death implicated in various pathologies including neurodegeneration and ischemia-reperfusion injury (Dixon & Stockwell, 2014, Nature Chemical Biology). Therapeutic strategies targeting these species involve radical-trapping antioxidants (RTAs) and scavengers, such as Edaravone or Vitamin E, which neutralize radicals to prevent membrane rupture and DNA damage (FDA, 2017, Radicava Prescribing Information). These interventions aim to restore redox homeostasis and have been explored extensively in conditions like amyotrophic lateral sclerosis (ALS) and acute ischemic stroke (Kuroda et al., 2015, World Neurosurgery).

Other names

ROSLipid peroxyl radicalsLipid alkoxyl radicalsOxidative stress mediatorsReactive oxygen metabolitesReactive nitrogen speciesRNS

Neutralization of reactive species through radical scavenging, electron donation, or inhibition of the lipid peroxidation chain reaction to prevent cellular damage and ferroptotic cell death.