Advanced lipoxidation end product (ALE)

Advanced lipoxidation end products (ALEs) are a chemically diverse family of adducts and cross-linked protein modifications formed by the non-enzymatic reaction of reactive lipid peroxidation products—primarily aldehydes such as malondialdehyde (MDA), 4-hydroxy-nonenal (HNE), and acrolein (ACR)—with nucleophilic amino acid residues (especially lysine) in proteins. These modifications disrupt protein structure and function and serve as markers and mediators of oxidative stress and tissue damage. ALEs accumulate during aging and oxidative stress and have been associated with cellular dysfunction in diabetes, atherosclerosis, neurodegenerative diseases, inflammation, aging, and metabolic syndrome. ALEs can also bind to the receptor for advanced glycation end products (RAGE), activating pro-inflammatory signaling pathways and promoting tissue injury and fibrosis. Dietary intake of ALEs from heat-processed foods may also contribute to metabolic disorders. Detection of ALEs (such as MDA-lysine adducts) is used as a biomarker for oxidative lipid damage in clinical and research settings.

Other names

ALEsadvanced lipid peroxidation end productslipid-derived advanced end products