Phospholipid hydroperoxidation via singlet oxygen generation

Phospholipid hydroperoxidation via singlet oxygen generation refers to a chemical reaction in which singlet molecular oxygen (¹O₂), a highly reactive form of oxygen often produced by photodynamic action or certain enzymatic reactions, reacts with unsaturated phospholipids in biological membranes. This leads to the formation of phospholipid hydroperoxides, which can further decompose into reactive species including additional radicals and more singlet oxygen through mechanisms such as the Russell mechanism. The resulting products cause membrane damage, disrupt cellular integrity, trigger redox signaling pathways, and contribute to processes like apoptosis and inflammation. This is not an individual molecule/protein/receptor but rather describes a biochemical pathway/process. It plays important roles in both physiological signaling and pathological conditions associated with oxidative stress—such as cancer progression, neurodegeneration, cardiovascular diseases, and inflammatory responses—by mediating membrane oxidation and subsequent cellular dysfunction. Enzymes like phospholipid hydroperoxide glutathione peroxidase (GPx4/PHGPx) help detoxify these harmful products within cells. Because it is not itself a discrete molecular entity but instead describes an interaction between reactive species (singlet oxygen) and membrane lipids (phospholipids), it should not be considered a canonical therapeutic target. The decomposition of lipid hydroperoxides into peroxyl radicals is a potential source of singlet molecular oxygen (¹O₂) in biological systems... These chemical trapping and photoemission properties clearly demonstrate that the decomposition... generates ¹O₂, consistent with the Russell mechanism... Singlet molecular oxygen is a reactive species involved in biological oxidative processes. The major cellular targets... are unsaturated fatty acids in the membrane... Lipid hydroperoxides exert multiple damaging effects on cellular macromolecules... attention has been focused on elucidating their pathophysiological role.

Other names

Singlet oxygen-mediated phospholipid peroxidationLipid hydroperoxide-induced singlet oxygen productionSinglet molecular oxygen (1O2) generation from lipid hydroperoxides

Drugs do not directly act on this process; rather, antioxidants can reduce the formation or effects of lipid hydroperoxides.