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    Prostaglandins Leukot Essent Fatty Acids. 1991 Nov;44(3):149-54.

    Effects of diltiazem on thromboxane B2 production from platelet-rich plasma and whole blood.

    Anfossi G, Trovati M, Mularoni E, Massucco P, Cavalot F, Mattiello L, Emanuelli G.

    Source

    Department of Clinical and Biological Sciences, University of Turin, Ospedale S. Luigi Gonzaga, Orbassano, Italy.

    Abstract

    The present study evaluated the effects of the calcium-channel blocking agent diltiazem on platelet aggregation and on synthesis of thromboxane B2 (the stable metabolite of thromboxane A2) from platelet-rich plasma (PRP) and whole blood samples. Our results showed that diltiazem inhibits collagen- and thrombin-induced platelet aggregation and TXB2 production from PRP. Since no significant interference with conversion of arachidonate to thromboxane A2 was demonstrated, inhibition of phospholipase A2 activity may be the prevailing mechanism of the diltiazem effect. The drug demonstrated a dose-related inhibitory activity on TXB2 synthesis from whole blood samples during spontaneous clotting or following stimulation with collagen or thrombin. The present results give further evidences for an antiplatelet activity of diltiazem and support the hypothesis that inhibition of platelet function contributes to the therapeutic efficacy of this drug in the treatment of cardiovascular diseases.

    PMID:
    1808624
    [PubMed - indexed for MEDLINE]

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