Hypochlorite induces the formation of LDL(-), a potentially atherogenic low density lipoprotein subspecies.
Oxidation of low density lipoprotein (LDL) induced by hypochlorous acid (HOCl) leading to LDL(-), a minimally oxidized subspecies of LDL, was investigated. LDL(-) is characterized by its greater electronegativity and oxidative status, and is found in plasma in vivo. Its concentration was found to be elevated under conditions that predispose humans to atherosclerosis. We found that HOCl also converts LDL rapidly to an even more oxidized state, identified as LDL(2-), which is more electronegative than LDL(-). After milder oxidation for short durations, formation of LDL(-) takes place while less LDL(2-) is formed. Under these conditions, addition of methionine not only suppressed further oxidation of LDL but also favored the formation of LDL(-) over LDL(2-), possibly by removing chloramines at lysyl residues of LDL. The presence of lipoprotein-deficient plasma did not prevent HOCl-mediated conversion of LDL to more electronegative species. It is concluded that the HOCl-mediated conversion of LDL into more electronegative species might be physiologically relevant.
Fabjan
J S
JS
Institute of Molecular Biology, Biochemistry and Microbiology, University of Graz, Austria.
Abuja
P M
PM
Schaur
R J
RJ
Sevanian
A
A
D001161:Arteriosclerosis / Q000378:metabolism*; D002700:Chloramines / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D004305:Dose-Response Relationship, Drug; D006801:Humans; D006997:Hypochlorous Acid / Q000378:metabolism* / Q000494:pharmacology; D008077:Lipoproteins, LDL / Q000097:blood / Q000737:chemistry* / Q000378:metabolism*; D008715:Methionine / Q000378:metabolism / Q000494:pharmacology; D016877:Oxidants / Q000378:metabolism* / Q000494:pharmacology; D010084:Oxidation-Reduction / Q000187:drug effects; D010949:Plasma / Q000378:metabolism; D055672:Static Electricity; D013997:Time Factors
D002700:Chloramines; D008077:Lipoproteins, LDL; D016877:Oxidants; D006997:Hypochlorous Acid; D008715:Methionine; C030816:chloramine