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Modification of low density lipoproteins by human arterial smooth muscle cells was characterized by increased electrophoretic mobility and increased content of malondialdehyde-like oxidation products reactive with thiobarbituric acid. Lipoprotein modification was promoted by micromolar concentrations of iron or copper in the culture medium and was metal ion concentration- and time-dependent. The ability of diverse media to promote smooth muscle cell-mediated low density lipoprotein modification correlated with their iron concentration. Therefore, metal ion concentration of culture media contributes substantially to low density lipoprotein modification in vitro. Human monocyte-derived macrophages took up and esterified the cholesterol from modified low density lipoprotein more extensively than from native low density lipoprotein. Metal ion-mediated modification of low density lipoprotein may be a contributing factor to the pathogenesis of arteriosclerosis.

Iron and copper promote modification of low density lipoprotein by human arterial smooth muscle cells in culture.