Lipid hydroperoxyl radical (LOO•) (LOO•)

Lipid hydroperoxyl radicals (LOO•) are highly reactive chemical intermediates generated during the propagation phase of lipid peroxidation, a process that primarily affects polyunsaturated fatty acids within cellular membranes [Dixon et al., 2012, Cell]. These radicals are formed when carbon-centered lipid radicals react rapidly with molecular oxygen; they subsequently abstract hydrogen atoms from adjacent lipids, driving a self-amplifying cascade of oxidative damage that is the execution mechanism of ferroptosis [Conrad et al., 2018, Nature Chemical Biology]. The accumulation of these species leads to catastrophic membrane disruption, loss of organelle integrity, and the generation of secondary toxic electrophiles like 4-hydroxynonenal, which contribute to the pathology of neurodegenerative diseases, myocardial infarction, and acute kidney injury [Stockwell et al., 2017, Cell]. Therapeutic strategies targeting these radicals utilize radical-trapping antioxidants (RTAs), such as Ferrostatin-1 and Vitamin E, which intercept the peroxyl species to halt the peroxidation chain reaction [Zilka et al., 2017, ACS Central Science]. By neutralizing lipid hydroperoxyl radicals, these pharmacological agents prevent iron-dependent regulated cell death and protect tissues from oxidative degradation in various inflammatory and degenerative clinical contexts.

Other names

Lipid peroxyl radicalPeroxyl radicalLipid-derived peroxyl radicalLOO.

Radical-trapping antioxidants (RTAs) neutralize lipid hydroperoxyl radicals by donating a hydrogen atom (Hydrogen Atom Transfer), which converts the reactive radical into a stable lipid hydroperoxide, thereby terminating the self-propagating chain reaction of lipid peroxidation [Zilka et al., 2017, ACS Central Science].