PMID: 8963725May 1, 1996Paper

Complement-induced release of monocyte chemotactic protein-1 from human smooth muscle cells. A possible initiating event in atherosclerotic lesion formation

Arteriosclerosis, Thrombosis, and Vascular Biology
J TorzewskiD E Bowyer

Abstract

Increasing evidence suggests that complement activation might represent an important mechanism in early atherogenesis. Thus, complement components, in particular the membrane attack complex (MAC) C5b-9(m), have been isolated from human atherosclerotic lesions. Furthermore, complement activation is known to occur in atherosclerotic lesions induced in experimental animals, and the severity of cholesterol-induced plaques is markedly reduced in complement-deficient animals. During atherogenesis monocytes are recruited into the arterial wall, and a potent chemoattractant for monocytes, monocyte chemotactic protein-1 (MCP-1), is expressed by vascular smooth muscle cells (SMCs). We hypothesized that generation of MACs on SMCs during the activation of complement might lead to the release of MCP-1 and hence to monocyte recruitment. In this study, MACs were generated on human SMCs in vitro by sequential addition of the purified complement components C5b6, C7, C8, and C9. This supernatant of the culture was chemotactic for freshly isolated peripheral blood monocytes in a modified Boyden chamber. The chemotactic activity of the supernatant was abolished by anti-MCP-1 blocking antibodies but not by an isotype-matched antibody against an irr...Continue Reading

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