Lipid peroxyl radical in cell membrane (LOO•)

Lipid peroxyl radicals are highly reactive species generated during the chain reaction of lipid peroxidation, predominantly affecting unsaturated lipids within the cell membrane. Their formation significantly alters the membrane's physical and chemical properties, initiating processes like bilayer thinning, loss of fluidity, protein mislocalization, and increased membrane permeability. Downstream products of lipid peroxyl radicals—such as 4-HNE and MDA—modify proteins and nucleic acids, propagate cell injury, and trigger programmed cell death (notably ferroptosis). Although they are not direct drug targets, controlling their formation and activity via antioxidants or enzyme modulation is being explored therapeutically to mitigate the damage seen in neurodegenerative, cardiovascular, and inflammatory diseases. Detection of lipid peroxidation biomarkers serves as a clinical indicator for oxidative stress-associated diseases.

Other names

Lipid hydroperoxyl radicalLOO radicalperoxyl radicalinvolved in cell membrane lipid peroxidation

Scavenging of peroxyl radicals (chain-breaking by antioxidants) Inhibition of radical formation Chelation of transition metals (to block Fenton chemistry) Inhibition of enzymes that catalyze lipid oxidation (inhibitors of POR, lipoxygenases)