Activated platelets trigger an inflammatory response and enhance migration of aortic smooth muscle cells.

Abstract:

OBJECTIVE:Exposure of the subendothelium to flowing blood following rupture of atherosclerotic lesions or during balloon angioplasty initiates platelet adhesion to the vascular wall. Because activated platelets release proinflammatory mediators (e.g., interleukin (IL)-1beta) and secrete growth factors, platelet adhesion to the subendothelial matrix might contribute to the recruitment of inflammatory cells and promote migration and proliferation of vascular smooth muscle cells (SMCs). METHODS AND RESULTS:Here, we demonstrate that incubation of cultured monolayers of aortic SMCs with alpha-thrombin-activated platelets significantly enhances the secretion of monocyte chemoattractant protein-1 (MCP-1) (P<0.05) and promotes SMC migration (P<0.05). Platelet-induced secretion of MCP-1 was abolished by anti-IL-1alpha and beta monoclonal antibodies or the IL-1 receptor antagonist (IL-1RA). In contrast, platelet-mediated SMC migration was attenuated only by anti-platelet-derived growth factor (PDGF)-mAb but not by IL-1RA. Correspondingly, recombinant human interleukin-1 (rhIL-1) beta increased MCP release by SMCs but had no effect on SMC migration. Platelet-mediated MCP secretion by SMCs involved the activation and nuclear translocation of the transcription factor nuclear factor-kappaB (NF-kappaB). CONCLUSION:Therefore, platelet adhesion to the subendothelium increases the chemotactic and migratory properties of SMC and is likely to contribute substantially to the process of atherosclerosis and vessel (re-)stenosis.

journal_name

Thromb Res

journal_title

Thrombosis research

authors

Massberg S,Vogt F,Dickfeld T,Brand K,Page S,Gawaz M

doi

10.1016/s0049-3848(03)00342-6

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

187-94

issue

4

eissn

0049-3848

issn

1879-2472

pii

S0049384803003426

journal_volume

110

pub_type

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