Lipid radical in biological membrane (null)

Lipid radicals are highly reactive chemical species generated during the process of lipid peroxidation, predominantly targeting polyunsaturated fatty acids within biological membranes. Their formation is initiated by the abstraction of an allylic hydrogen atom, forming a carbon-centered lipid radical (L•), followed by reaction with molecular oxygen to give lipid peroxyl radicals (LOO•). These radical intermediates drive chain reactions that compromise membrane structure, fluidity, and protein function, and play a central role in cell injury and regulated cell death (notably ferroptosis). While not a molecular target for drugs, their pathological significance makes antioxidant strategies critical for limiting lipid peroxidation in disease contexts. Detection of their downstream products (e.g., MDA, 4-HNE) serves as biomarkers for oxidative membrane damage.

Other names

Lipid peroxyl radicallipid radicalL•LOO•membrane lipid radicaloxidized membrane lipid

Scavenging or quenching of lipid radicals to terminate chain propagation (by antioxidants) Restoration of membrane integrity by reducing or preventing lipid peroxidation