PuSH - Publication Server of Helmholtz Zentrum München: Surface expression of collagen receptor Fc receptor-gamma/glycoprotein VI is enhanced on platelets in type 2 diabetes and mediates release of CD40 ligand and activation of endothelial cells.

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Cabeza, N.* ; Li, Z.* ; Schulz, C.* ; Kremmer, E. ; Massberg, S.* ; Bültmann, A.* ; Gawaz, M.*

Surface expression of collagen receptor Fc receptor-gamma/glycoprotein VI is enhanced on platelets in type 2 diabetes and mediates release of CD40 ligand and activation of endothelial cells.

Diabetes 53, 2117-2121 (2004)

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Diabetes is associated with an enhanced collagen-mediated platelet activation that contributes significantly to thromboischemic complications. In this study, the platelet collagen receptor glycoprotein VI (GPVI) was studied in 385 patients with type 2 diabetes. Surface expression of the platelet Fc receptor that forms a functional complex with GPVI was significantly increased in patients with diabetes compared with those without diabetes (P = 0.02). Fc receptor expression correlated with GPVI expression and was found to be independently associated with diabetes (r = 0.529, P < 0.001). Stimulation of GPVI through a specific anti-GPVI monoclonal antibody significantly enhanced surface expression of CD40L (P = 0.006). Because CD40L is a potent platelet-derived cytokine that is involved in thrombosis and atherosclerosis, we evaluated the effect of GPVI-mediated release of CD40L on activation of endothelial cells. Coincubation of GPVI-stimulated platelets resulted in substantial enhanced endothelial surface expression of CD62P, α_vβ₃, and intercellular adhesion molecule 1 (P < 0.05) and secretion of monocyte chemoattractant protein 1 of cultured human umbilical vein endothelial cells (P < 0.01). These results suggest that the function of collagen receptor GPVI is altered in type 2 diabetes and may play an important role in atherothrombotic complications. Inhibition of GPVI may be a promising pharmacological target in the treatment of high-risk diabetic patients.

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