Cholesteryl linoleate hydroperoxides are derived from the autoxidation of cholesteryl linoleate and contain a mixture of racemic 9- and 13-HpODE cholesteryl esters. Oxidative modification of LDL is suggested to play an important role in atherosclerosis. (±)9- and (±)13-HODE cholesteryl esters were originally extracted from atherosclerotic lesions and shown to be produced by Cu2+-catalyzed oxidation of LDL.1,2 Later studies determined that 15-LO, from rabbit reticulocytes and activated human monocytes, oxygenates cholesteryl linoleate to both 9- and 13-hydroperoxy linoleate cholesteryl esters.3,4 Cholesteryl ester hydroperoxides may be transferred from LDL to HDL, reduced to the corresponding hydroxides, and cleared via the liver.5,6
1
Brooks, C.J.W., Harland, W.A., Steel, G., et al. Lipids of human atheroma: Isolation of hydroxyoctadecadienoic acids from advanced aortal lesions. Biochim Biophys Acta202563-566(1970).
2
Lenz, M.L., Hughes, H., Mitchell, J.R., et al. Lipid hydroperoxy and hydroxy derivatives in copper-catalyzed oxidation of low density lipoprotein. J Lipid Res311043-1050(1990).
3
Belkner, J., Wiesner, R., Kühn, H., et al. The oxygenation of cholesterol esters by the reticulocyte lipoxygenase. FEBS Lett279110-114(1991).
4
Folcik, V.A., and Cathcart, M.K. Predominance of esterified hydroperoxy-linoleic acid in human monocyte-oxidized LDL. J Lipid Res351570-1582(1994).
5
Sattler, W., and Stocker, R. Greater selective uptake by Hep G2 cells of high-density lipoprotein cholesteryl ester hydroperoxides than of unoxidized cholesteryl esters. Biochem J294771-778(1993).
6
Fluiter, K., Vietsch, H., Biessen, E.A.L., et al. Increased selective uptake in vivo and in vitro of oxidized cholesteryl esters from high-density lipoprotein by rat liver parenchymal cells. Biochem J319471-476(1996).
Belkner, J., Wiesner, R., Kühn, H., et al. The oxygenation of cholesterol esters by the reticulocyte lipoxygenase. FEBS Lett279110-114(1991).
Lenz, M.L., Hughes, H., Mitchell, J.R., et al. Lipid hydroperoxy and hydroxy derivatives in copper-catalyzed oxidation of low density lipoprotein. J Lipid Res311043-1050(1990).
Brooks, C.J.W., Harland, W.A., Steel, G., et al. Lipids of human atheroma: Isolation of hydroxyoctadecadienoic acids from advanced aortal lesions. Biochim Biophys Acta202563-566(1970).
Folcik, V.A., and Cathcart, M.K. Predominance of esterified hydroperoxy-linoleic acid in human monocyte-oxidized LDL. J Lipid Res351570-1582(1994).
Sattler, W., and Stocker, R. Greater selective uptake by Hep G2 cells of high-density lipoprotein cholesteryl ester hydroperoxides than of unoxidized cholesteryl esters. Biochem J294771-778(1993).
Fluiter, K., Vietsch, H., Biessen, E.A.L., et al. Increased selective uptake in vivo and in vitro of oxidized cholesteryl esters from high-density lipoprotein by rat liver parenchymal cells. Biochem J319471-476(1996).