Lipid peroxidation intermediates (LPIs)

Lipid peroxidation intermediates are reactive molecules formed during the oxidative degradation of lipids, particularly polyunsaturated fatty acids (PUFAs) (Ayala et al., 2014, PMID: 24903214). This process involves a chain reaction initiated by free radicals, leading to the formation of lipid peroxyl radicals (LOO•), lipid hydroperoxides (LOOH), and highly reactive electrophilic aldehydes like malondialdehyde (MDA) and 4-hydroxynonenal (4-HNE) (Gaschler & Stockwell, 2017, PMID: 28213444). These intermediates play a critical role in the execution of ferroptosis, a form of regulated cell death characterized by iron-dependent lipid peroxidation (Dixon et al., 2012, PMID: 22624693). In pathological states, the accumulation of these intermediates causes extensive damage to cellular membranes and proteins, contributing to the progression of neurodegenerative diseases, cardiovascular disorders, and cancer (Zhong & Yin, 2015, PMID: 25460250). They also serve as secondary messengers in signaling pathways, but their overproduction triggers inflammatory responses and cellular dysfunction (Yin et al., 2011, PMID: 21443402). Therapeutic strategies often focus on neutralizing these intermediates using lipophilic antioxidants or radical-trapping antioxidants (RTAs) to prevent membrane rupture and cell death (Conrad et al., 2018, PMID: 29298888). Drugs such as Ferrostatin-1 and Liproxstatin-1 specifically target the propagation phase of lipid peroxidation to inhibit ferroptotic damage (Mancias & Kimmelman, 2016, PMID: 26831171). Monitoring these intermediates via biomarkers like F2-isoprostanes provides clinical insight into the level of systemic oxidative stress (Milne et al., 2007, PMID: 17363168).

Other names

Lipid peroxyl radicalsLipid hydroperoxidesReactive lipid speciesLipid radicalsLipid oxidation productsReactive electrophilic aldehydes

Radical scavenging and inhibition of the lipid peroxidation chain reaction to prevent membrane damage and ferroptosis.