Alimentary lipemia enhances the membrane expression of platelet P-selectin without affecting other markers of platelet activation

Atherosclerosis
A BröijersénP Hjemdahl

Abstract

The present study was conducted to determine whether alimentary lipemia alters platelet activity in vivo. Normolipidemic volunteers were given a fatty meal and platelet function was assessed before, and 3 and 6 h after the meal. Platelet aggregability and secretion was determined using whole blood flow cytometry (expression of platelet P-selectin and fibrinogen binding), filtragometry ex vivo (reflecting platelet aggregability in vivo) and by measurements of platelet specific products in plasma (beta-thromboglobulin and platelet factor 4). Plasma triglycerides increased from 0.8 (0.6:1.1; median, 25th and 75th percentiles) to 1.7 (1.0:2.3) mmol/l at 3 h and returned to baseline after 6 h (P < 0.001, one-way ANOVA). Apo B-100 and apo B-48 were both markedly increased 3 h postprandially in the Sf 60-400 fraction (large VLDLs, P < 0.001 for both), whereas the Sf 20-60 (small VLDLs) and Sf 12-20 fractions (IDL) did not change. The platelet function assessments revealed that the percentage of platelets expressing P-selectin increased by 40% (5%; 64%) after 3 h and by 51% (- 7%; 85%) 6 h postprandially in unstimulated samples (P < 0.05 for both). In samples stimulated by ADP in vitro P-selectin expression increased by 45% (6%; 58%) a...Continue Reading

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