Reactive oxygen species and lipid radicals in lipid membranes and lipoproteins

Reactive oxygen species (ROS) and lipid radicals are highly reactive chemical entities that play a central role in the process of lipid peroxidation within cellular membranes and lipoproteins (Ayala et al., 2014, Oxidative Medicine and Cellular Longevity). These species, including superoxide anions, hydroxyl radicals, and lipid peroxyl radicals, initiate and propagate oxidative damage to polyunsaturated fatty acids, leading to the loss of membrane fluidity and the formation of cytotoxic aldehydes (Gaschler & Stockwell, 2017, Biochemical and Biophysical Research Communications). In the context of lipoproteins, particularly low-density lipoprotein (LDL), oxidative modification by these radicals is a key initiating event in the development of atherosclerosis (StatPearls, 2023, Biochemistry, Low Density Lipoprotein). Therapeutic intervention typically focuses on the use of antioxidants that act as scavengers or chain-breakers to neutralize these radicals before they can cause extensive tissue damage (PubChem, 2024, Alpha-tocopherol). While essential for certain signaling pathways at low levels, their uncontrolled accumulation is a hallmark of various chronic conditions, including neurodegenerative diseases and cardiovascular disorders (Halliwell & Gutteridge, 2015, Free Radicals in Biology and Medicine).

Other names

Lipid peroxyl radicalsLipid hydroperoxidesOxidative stress productsLipid peroxidation intermediatesReactive oxygen species

Radical scavenging and chain-breaking antioxidant activity to neutralize peroxyl radicals and prevent the propagation of lipid peroxidation.