Enzymatically degraded, nonoxidized LDL induces human vascular smooth muscle cell activation, foam cell transformation, and proliferation

Article

关键词: LOW-DENSITY-LIPOPROTEIN;    MONOCYTE CHEMOATTRACTANT PROTEIN-1;    HUMAN ATHEROSCLEROTIC LESIONS;    INTERLEUKIN-6 GENE TRANSCRIPTS;    GROWTH-FACTOR;    CHEMOTACTIC PROTEIN-1;    LIPID-PEROXIDATION;    ENDOTHELIAL-CELLS;    MACROPHAGES;    ATHEROGENESIS;   

DOI  :  10.1161/01.CIR.101.15.1799

来源: SCIE

【 摘 要 】

Background-Enzymatic, nonoxidative modification transforms LDL to an atherogenic molecule (E-LDL) that activates complement and macrophages and is present in early atherosclerotic lesions. Methods and Results-We report on the atherogenic effects of E-LDL on human vascular smooth muscle cells (SMC). E-LDL accumulated in these cells, and this was accompanied by selective induction of monocyte chemotactic protein-1 in the absence of effects on the expression of interleukin (IL)-8, RANTES, or monocyte inflammatory proteins-1 alpha and -beta) Furthermore, E-LDL stimulated the expression of gp130, the signal-transducing chain of the IL-6 receptor (IL-6R) family, and the secretion of IL-6. E-LDL invoked mitogenic effects on SMC through 2 mechanisms. First, an autocrine mitogenic circuit involving platelet-derived growth factor and fibroblast growth factor-beta was induced. Second, upregulation of gp130 rendered SMC sensitive to transsignaling through the IL-6/sIL-GR activation pathway. Because E-LDL promoted release of both IL-6 and sIL-6R from macrophages, application of macrophage cell supernatants to prestimulated SMC provoked a pronounced and sustained proliferation of the cells. Conclusions-E-LDL can invoke alterations in SMC that are characteristic of the evolving atherosclerotic lesion.

【 授权许可】

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