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Biochemistry Group, The Heart Research Institute, Sydney, Australia
1Correspondence: Biochemistry Group, The Heart Research Institute, 145 Missenden Rd., Camperdown, Sydney, NSW 2050 Australia. E-mail: r.stocker{at}hri.org.au
The `oxidation theory' of atherosclerosis proposes that oxidation of
low density lipoprotein (LDL) contributes to atherogenesis. Although
little direct evidence for a causative role of `oxidized LDL' in
atherogenesis exists, several studies show that, in
vitro, oxidized LDL exhibits potentially proatherogenic
activities and lipoproteins isolated from atherosclerotic lesions are
oxidized. As a consequence, the molecular mechanisms of LDL
oxidation and the actions of
-tocopherol (
-TOH, vitamin E), the
major lipid-soluble lipoprotein antioxidant, have been studied in
detail. Based on the known antioxidant action of
-TOH and
epidemiological evidence, vitamin E is generally considered to be
beneficial in coronary artery disease. However, intervention studies
overall show a null effect of vitamin E on atherosclerosis. This
confounding outcome can be rationalized by the recently discovered
diverse role for
-TOH in lipoprotein oxidation; that is,
-TOH
displays neutral, anti-, or, indeed, pro-oxidant activity under various
conditions. This review describes the latter, novel action of
-TOH,
termed tocopherol-mediated peroxidation, and discusses the benefits of
vitamin E supplementation alone or together with other antioxidants
that work in concert with
-TOH in ameliorating lipoprotein lipid
peroxidation in the artery wall and, hence, atherosclerosis.Upston,
J. M., Terentis, A. C., Stocker, R. Tocopherol-mediated
peroxidation of lipoproteins: implications for vitamin E as a potential
antiatherogenic supplement.
Key Words: atherosclerosis lipid peroxidation antioxidants LDL
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