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  • Title: Stereospecific inhibition of 5-HT-induced increase of intracellular free calcium by (+)- and (-)-desmethoxyverapamil in human platelets.
    Author: Bruns C, Marmé D, Osswald H.
    Journal: Br J Pharmacol; 1986 Mar; 87(3):481-2. PubMed ID: 3801761.
    Abstract:
    The concentration of intracellular free calcium [Ca2+]i in human platelets was measured by the quin-2 method. 5-Hydroxytryptamine (5-HT) at 10(-5) M induced a rapid transient increase of [Ca2+]i which was antagonized by 10(-7) M ketanserin or cyproheptadine. The verapamil derivative, desmethoxyverapamil (D888), showed stereospecific inhibition of the 5-HT-induced [Ca2+]i increase. The IC50 for (-)-D888 was approx. 2 X 10(-8) M; (+)-D888 was almost 50 times less potent.
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