Wali FA, Greenidge E. Comparative effects of verapamil and D-600 on the contractile responses produced by neurotransmitters and depolarizing agents in the rat isolated seminal vesicle.
GENERAL PHARMACOLOGY 1989;
20:671-6. [PMID:
2575064 DOI:
10.1016/0306-3623(89)90105-5]
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Abstract
1. The comparative effects of verapamil and D-600, on isometric contractions produced by noradrenaline, acetylcholine, phenylephrine, clonidine, carbachol and high potassium, were studied in rat isolated seminal vesicle. 2. The aim was to see if verapamil and D-600 differed, in their selectivity, of blocking calcium, channels, and hence inhibition of isometric contractions produced in this preparation. 3. Verapamil (1 microM) and D-600 (9.5 microM), selectively, reduced the isometric contractions, greater reductions occurred in the KCl-induced contractions (control EC50 19 +/- 1.5 mM, in verapamil 58 +/- 1.3 mM, and in D-600 37 +/- 2.0 mM, means +/- SE, n = 8, P less than 0.001, less than 0.01, respectively). 4. It was concluded that KCl-induced contractions were voltage-dependent, whereas noradrenaline operated via both voltage and receptor-mediated mechanisms. 5. The clinical relevance of these results was discussed, and it may help our current understanding of the pharmacological management of sexual dysfunction.
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