Increased platelet-fibrinogen interaction in patients with hypercholesterolemia and hypertriglyceridemia

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      Binding of fibrinogen to platelets washed from the blood of patients with hypercholesterolemia and hypertriglyceridemia (n = 25) and control donors (n = 12) was compared. In addition, the content of platelet glycoprotein IIb was determined by radioimmunoassay. Fibrinogen was bound in significantly higher amounts (P < 0.02) to hyperlipidaemic platelets activated by ADP than to control ones (107 112 ± 16 371 and 45 612 ± 6495 molecules per platelet, respectively). The mean content of GPIIb was the same in hyperlipidaemic and in control plateles (2.06 ± 0.16 and 1.94 ± 0.21 μg/108 platelets, respectively). The amount of fibrinogen bound to the activated hyperlipidaemic platelets showed a positive correlation with total plasma cholesterol and LDL (r = 0.45 and 0.47, respectively) whereas a negative correlation with plasma HDL was found (r = −0.50). The increased expression of fibrinogen binding sites similar to that of hyperlipidaemic platelets could be produced by preincubation of normal platelets with palmitic acid. This was evidenced by a significant increase of fibrinogen binding sites in control platelets. This suggests that either palmitoylation of the receptor or microenvironment changes in the membrane lipid bilayer may be responsible for the enhanced platelet receptor capacity to bind fibrinogen.


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