Reactive oxygen species and cellular lipid membranes (ROS/LPO)

General free radicals, specifically reactive oxygen species (ROS), are highly reactive chemical entities with unpaired electrons that can damage cellular macromolecules. Cellular lipid membranes are particularly vulnerable to these species because their polyunsaturated fatty acid components undergo lipid peroxidation, a self-propagating chain reaction that compromises membrane structural integrity and function (PMID: 24926875). This process is a hallmark of oxidative stress and contributes to the pathogenesis of numerous conditions, including neurodegenerative diseases, cardiovascular disorders, and aging (PMID: 23675073). Therapeutic strategies involve the use of antioxidants and radical scavengers that neutralize ROS or terminate the peroxidation process within the lipid bilayer (PMID: 30107237). For example, the drug edaravone is used in the treatment of Amyotrophic Lateral Sclerosis (ALS) specifically to reduce oxidative damage to neuronal membranes (PMID: 28838308). However, targeting these processes is complex because low levels of ROS are essential for normal physiological signaling and immune defense (PMID: 21153172). Furthermore, many clinical trials for general antioxidants have failed to show efficacy, possibly due to the non-specific nature of the target and the difficulty in achieving therapeutic concentrations at the site of damage. Despite these challenges, protecting lipid membranes from oxidative degradation remains a key focus in drug development for acute injuries like stroke and chronic conditions like atherosclerosis.

Other names

Free radicalsReactive oxygen speciesROSLipid peroxidationOxidative stressCellular membranesPolyunsaturated fatty acids

Radical scavenging and inhibition of lipid peroxidation by neutralizing unpaired electrons and terminating chain reactions within the lipid bilayer.