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BACKGROUND P-selectin, an integral membrane glycoprotein of platelets and endothelial cells, is rapidly redistributed to the cell surface after cellular activation. The soluble form of P-selectin has been shown to be present in people with normal circulation. The purpose of the present study was therefore to examine the soluble form of P-selectin in patients with acute myocardial infarction (AMI). METHODS Whole blood was obtained from nine patients with AMI and from 10 volunteers who made up the control group. Plasma concentrations of the soluble form of P-selectin were examined with a monoclonal antibody-based enzyme immunoassay. RESULTS Plasma P-selectin levels in control volunteers were 178 +/- 44 ng/ml. In patients with AMI, plasma P-selectin levels on days 1, 2 and 3 were 743 +/- 374, 627 +/- 267, and 588 +/- 223 ng/ml, respectively (P < 0.001)--significantly higher than the levels in the control volunteers. CONCLUSIONS Plasma concentrations of the soluble form of P-selectin were markedly higher in patients with AMI, suggesting the activation of platelets, or endothelial cells, or both. Thus, quantitative measurements of plasma P-selectin concentrations may help to assess the pathophysiology of inflammatory reactions in patients with AMI.
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