Arteriosclerosis, Vol 4, 357-364, Copyright © 1984 by American Heart Association

ARTICLES

Endothelial and smooth muscle cells alter low density lipoprotein in vitro by free radical oxidation

DW Morel, PE DiCorleto and GM Chisolm

Our purpose was to determine whether the action of oxidative free radicals released by endothelial cells and vascular smooth muscle cells grown in culture could be responsible for certain modifications to low density lipoprotein (LDL). In these experiments we showed that after a 48-hour incubation with human umbilical vein endothelial cells or bovine aortic smooth muscle cells, human LDL: 1) became oxidized, as evidenced by reactivity to thiobarbituric acid; 2) lost variable amounts of sterol relative to protein (up to 20%); 3) had an increased relative electrophoretic mobility (by 30% to 70%); and 4) became toxic to proliferating fibroblasts. None of these changes occurred after a 48- hour incubation with confluent fibroblasts or bovine aortic endothelial cells, and all could be virtually prevented by the presence of butylated hydroxytoluene or other free radical scavengers. The results suggest that cells modifying LDL do so in part by an oxidation of LDL subsequent to cellular generation of free radicals.

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