Reactive oxygen species (ROS) and lipid-derived free radicals (LFRs) (ROS/LFRs)

Reactive oxygen species (ROS) and lipid-derived free radicals (LFRs) are highly reactive chemical species generated as byproducts of aerobic metabolism or in response to exogenous stressors like radiation and toxins (NIH, 2023). In the lipid-rich environment of cellular membranes, these radicals—specifically lipid peroxyl (LOO•) and alkoxyl (LO•) radicals—drive the process of lipid peroxidation, which involves the oxidative degradation of polyunsaturated fatty acids (PubMed, PMID: 24903357). This process disrupts membrane fluidity, permeability, and the function of membrane-bound proteins, ultimately leading to cell death via pathways like ferroptosis (Nature, 2017). While ROS serve as critical secondary messengers in physiological signaling at low concentrations, their chronic elevation is implicated in the progression of neurodegenerative diseases, cardiovascular disorders, and chronic inflammation (StatPearls, 2023). Therapeutic targeting of these species involves the administration of lipophilic antioxidants and radical scavengers, such as Edaravone or Vitamin E, which localize to the membrane to neutralize radicals and terminate the self-propagating chain reaction (PubChem).

Other names

Oxidative stress mediatorsLipid peroxyl radicalsLipid hydroperoxidesOxygen radicalsMembrane-associated free radicalsLipid-derived radicals

Neutralization of reactive species through radical scavenging and termination of lipid peroxidation chain reactions.