Oxidized phospholipid substrate on low-density lipoprotein or high-density lipoprotein particle

Oxidized phospholipid substrates on LDL or HDL particles are not a single molecule or protein target but rather a class of lipid modifications that occur when polyunsaturated phospholipid components (primarily at the sn-2 position) of lipoproteins undergo oxidative reactions, typically during oxidative stress or inflammation[1][2][4]. On LDL, these oxidized phospholipids promote the formation of so-called oxidized LDL (oxLDL), a known contributor to atherosclerosis via immune activation, endothelial dysfunction, and direct cytotoxic effects[1][4]. On HDL, oxidized phospholipids may accumulate via lipid transfer proteins and may partially be detoxified or neutralized by HDL enzymes (such as paraoxonase 1 (PON1)), but with excessive load or dysfunctional HDL, these oxidized products may persist and exert pathological effects, possibly also serving as biomarkers for cardiovascular disease risk[2][4]. Because "oxidized phospholipid substrate on LDL/HDL" refers to a class of molecular states rather than a gene, protein, or classical therapeutic target, it is not considered a canonical therapeutic target, but rather a pathologically relevant lipid species with roles in various diseases, most notably cardiovascular disease and atherosclerosis[2][4]. There is currently no single drug that specifically binds or modifies these substrates, but lipid-lowering or antioxidant agents may reduce their formation indirectly. Key Points: - Not a protein, receptor, transporter, or enzyme, but products of lipid peroxidation associated with apoB- or apoA-I–containing particles (LDL, HDL)[1][4]. - Central to atherogenesis and cardiovascular pathology[1][2]. - Frequently used as a biomarker, but not a druggable target[4]. - Impractical as a canonical molecule entry; more accurately described as a pathogenic modification or disease product.

Other names

oxidized phospholipid on LDLoxidized phospholipid on HDLOxPL on LDLOxPL on HDLOxidized phospholipids on lipoprotein particles