Oxidation of low density lipoprotein and plasma by 15-lipoxygenase and free radicals.
It is generally accepted that the oxidation of pentadiene structures of polyunsaturated lipids by lipoxygenase (LOX) is regio- and enantio-specific, while the free radical-mediated lipid peroxidation gives stereo-random racemic products. It was confirmed that the oxidation of human low density lipoprotein (LDL) by 15-LOX from rabbit reticulocytes gave phosphatidylcholine (PC) and cholesteryl ester (CE) hydroperoxides regio-, stereo- and enantio-specifically. 15-LOX also oxidized human plasma to give specific PC and CE hydroperoxides in spite of the presence of high concentrations of antioxidants. More CE hydroperoxides were formed than PC hydroperoxides from LDL, but the reverse order was observed for plasma oxidation. The S/R ratio of the hydroperoxides decreased during long time incubation but remained significantly larger than one, while free radical-mediated oxidation of LDL and plasma gave racemic products.
Yamashita
H
H
Research Center for Advanced Science and Technology, University of Tokyo, Meguro, Japan.
Nakamura
A
A
Noguchi
N
N
Niki
E
E
Kühn
H
H
D000818:Animals; D001093:Arachidonate 15-Lipoxygenase / Q000378:metabolism*; D001391:Azo Compounds / Q000378:metabolism; D005609:Free Radicals; D006801:Humans; D008077:Lipoproteins, LDL / Q000378:metabolism*; D009570:Nitriles / Q000378:metabolism; D016877:Oxidants / Q000378:metabolism; D010084:Oxidation-Reduction; D011817:Rabbits
D001391:Azo Compounds; D005609:Free Radicals; D008077:Lipoproteins, LDL; D009570:Nitriles; D016877:Oxidants; C109522:V 70; D001093:Arachidonate 15-Lipoxygenase