Arteriosclerosis, Thrombosis, and Vascular Biology. 1996;16:416-424
© 1996 American Heart Association, Inc.
Articles |
Contrary Effects of Lightly and Strongly Oxidized LDL With Potent Promotion of Growth Versus Apoptosis on Arterial Smooth Muscle Cells, Macrophages, and Fibroblasts
From the Department of Pathology, Institute of Laboratory Medicine, Göteborg University, Sahlgrenska University Hospital, Göteborg, Sweden.
Abstract The inhibition of experimental atherosclerosis by antioxidants and the presence of oxidized LDL (oxLDL) in atherosclerotic lesions indicate that oxLDL may play what is perhaps a primary role in atherogenesis. LDL promotes the growth of arterial smooth muscle cells (SMCs), and oxLDL has cytotoxic effects. Since excessive intimal growth alternating with necrosis is typical of atherosclerotic lesions, we wondered whether these extreme changes in the lesions could be related to the extreme effects of LDL and oxLDL on cells. We therefore examined the effects of increasing LDL oxidation on its capacity to induce cell growth or cell death and whether the latter could be due to apoptosis. Cells of the types present in the atherosclerotic artery were used, ie, SMCs (human arterial), macrophages (human macrophage-like cell line THP-1), and human fibroblasts. Growth was evaluated by measuring the synthesis of DNA and culture size (MTT method) and apoptosis by using the in situ labeling of internucleosomally degraded DNA and, in the case of SMCs, the appearance of chromatin condensation. The oxidation of LDL was mediated by UV or Fe ions. Shortly oxidized LDL had a markedly increased growth-promoting effect on all cell types. With prolonged exposure to UV, but not to Fe, LDL became increasingly cytotoxic, and this toxicity was paralleled by the appearance of apoptosis in all cell types. After prolonged UV treatment, low-molecular-weight material from the partially degraded LDL was responsible for the induction of apoptosis. The dual effect of oxLDL, ie, its strong growth-promoting effect or the induction of cell death by apoptosis, depending on the degree of change by oxidation, is compatible with the notion that oxLDL plays a role not only in atherogenesis but also more extensively in the development of the structure typical of the atherosclerotic lesion, with focal excessive growth alternating with necrosis.
Key Words: arterial smooth muscle cell • macrophage • cell growth • apoptosis • oxidized LDL
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