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Effects of dietary vitamin C and E supplementation on the copper mediated oxidation of HDL and on HDL mediated cholesterol efflux.

Abstract：

:Copper mediated oxidative modification of high density lipoprotein (HDL) diminishes its capacity to promote cholesterol efflux from cells in culture. In the present study, HDL was isolated from eight subjects before and after a 10 day administration of the antioxidant vitamins C and E. After incubation HDL (1.25 mg protein/ml) with 10 microM copper for 0-4 h or with 0-20 microM copper for 4 h, thiobarbituric acid reactive substances (TBARS) production was significantly decreased following vitamin administration suggesting that the vitamins decreased the susceptibility of HDL to oxidation. However, two other assays of lipoprotein oxidation, trinitrobenzene sulfonic acid reactivity and conjugated diene formation, did not show a consistent effect of vitamin administration. To study cholesterol efflux, J774 macrophages were labeled with 3H cholesterol (0.1 microCi/ml, 50 micrograms/ml) and incubated with HDL or oxidized HDL (100 micrograms protein/ml) for 24 h. HDL isolated before vitamins and oxidized in vitro was 39% less effective in mediating efflux compared to unmodified HDL, while HDL isolated after vitamins and oxidized was 22% less effective (before vs. after vitamins, P < 0.015). HDL oxidation determined by measuring TBARS production correlated with decreased cholesterol efflux (r = 0.37, P < 0.050). These data suggest that oxidation of HDL interferes with its role in reverse cholesterol transport and that antioxidant vitamins have a protective effect.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Rifici VA,Khachadurian AK

doi

10.1016/s0021-9150(96)05928-x

subject

Has Abstract

pub_date

1996-11-15 00:00:00

pages

19-26

issue

1

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(96)05928-X

journal_volume

127

pub_type

杂志文章

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