Abstract
Ketanserin, a selective 5-HT2 serotonergic receptor antagonist, reducesin vitro the release-associated human platelet aggregation induced by threshold concentrations of collagen and curtails the second wave of aggregation/release induced by critical concentrations of ADP in particular and, to a lesser extent, of 1-epinephrine. Its inhibitory effect on the second waves becomes more pronounced when the reaction is already attenuated by moderate cyclo-oxygenase inhibition with esculetin, by yohimbine or by propranolol. The first wave of aggregation induced by ADP or 1-epinephrine is not affected.
Such an inhibition of secondary platelet recruitment by ketanserinin vitro may be due to an inhibition of the 5-HT2 receptor-mediated amplifying effects of platelet-released 5-HT or to a non-specific interference with the platelet membrane, reducing the release of mediators from the platelets.
Reduction of the increased plasma BTG levels in patients after ketanserin may result from such release-inhibiting mechanisms.
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De Clerck, F., Xhonneux, B. Effects of ketanserin, a selective 5-HT2 serotonergic antagonist, on the secondary recruitment of human plateletsin vitro . Agents and Actions 17, 515–526 (1986). https://doi.org/10.1007/BF01965524
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DOI: https://doi.org/10.1007/BF01965524