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Wolverhampton Intellectual Repository and E-Theses > Research Institutes > Research Institute in Healthcare Science > Diabetes, Physiology and Molecular Medicine Research Group > Cellular pathology of atherosclerosis: smooth muscle cells promote adhesion of platelets to cocultured endothelial cells.

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Title: Cellular pathology of atherosclerosis: smooth muscle cells promote adhesion of platelets to cocultured endothelial cells.
Authors: Tull, Samantha P.
Anderson, Stephen I.
Hughan, Sascha C.
Watson, Steve P.
Nash, Gerard B.
Rainger, G.E.
Citation: Circulation Research, 2006, 98(1): 98-104
Publisher: American Heart Association, Inc.
Journal: Circulation Research
Issue Date: 2006
DOI: 10.1161/01.RES.0000198386.69355.87
PubMed ID: 16322482
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Abstract: Although platelets do not ordinarily bind to endothelial cells (EC), pathological interactions between platelets and arterial EC may contribute to the propagation of atheroma. Previously, in an in vitro model of atherogenesis, where leukocyte adhesion to EC cocultured with smooth muscle cells was greatly enhanced, we also observed attachment of platelets to the EC layer. Developing this system to specifically model platelet adhesion, we show that EC cocultured with smooth muscle cells can bind platelets in a process that is dependent on EC activation by tumor necrosis factor (TNF)-alpha and transforming growth factor (TGF)-beta1. Recapitulating the model using EC alone, we found that a combination of TGF-beta1 and TNF-alpha promoted high levels of platelet adhesion compared with either agent used in isolation. Platelet adhesion was inhibited by antibodies against GPIb-IX-V or alpha(IIb)beta3 integrin, indicating that both receptors are required for stable adhesion. Platelet activation during interaction with the EC was also essential, as treatment with prostacyclin or theophylline abolished stable adhesion. Confocal microscopy of the surface of EC activated with TNF-alpha and TGF-beta1 revealed an extensive matrix of von Willebrand factor that was able to support the adhesion of flowing platelets at wall shear rates below 400 s(-1). Thus, we have demonstrated a novel route of EC activation which is relevant to the atherosclerotic microenvironment. EC activated in this manner would therefore be capable of recruiting platelets in the low-shear environments that commonly exist at points of atheroma formation.
Type: Article
Language: en
Keywords: Smooth muscle cells
e Endothelial cells
Platelet Adhesiveness
Transforming growth factor beta 1
MeSH: Atherosclerosis
Cells, Cultured
Coculture Techniques
Endothelial Cells
Muscle, Smooth, Vascular
Myocytes, Smooth Muscle
Platelet Adhesiveness
Platelet Glycoprotein GPIIb-IIIa Complex
Platelet Glycoprotein GPIb-IX Complex
Transforming Growth Factor beta
Transforming Growth Factor beta1
Tumor Necrosis Factor-alpha
von Willebrand Factor
ISSN: 1524-4571
Appears in Collections: Diabetes, Physiology and Molecular Medicine Research Group

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