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

Content Provider	Semantic Scholar
Author	Klouche, Mariam Rose-John, Stefan Schmiedt, Walther Bhakdi, Sucharit
Copyright Year	2000
Abstract	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-1alpha 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-6R 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.
File Format	PDF HTM / HTML
DOI	10.1161/01.CIR.101.15.1799
PubMed reference number	10769280
Journal	Medline
Volume Number	101
Issue Number	15
Alternate Webpage(s)	http://circ.ahajournals.org/content/101/15/1799.full.pdf
Alternate Webpage(s)	https://doi.org/10.1161/01.CIR.101.15.1799
Journal	Circulation
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article