Yashuda Y, Cabral AM, Pires JG, Antonio A. Dissociation of calcium- and barium-induced contractions of the rat duodenum smooth muscle.
GENERAL PHARMACOLOGY 1983;
14:643-7. [PMID:
6662344 DOI:
10.1016/0306-3623(83)90161-1]
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Abstract
The contractile responses elicited by calcium (Ca) and barium (Ba) upon the isolated rat duodenum immersed in a Ca-free Tyrode solution are not nervously mediated and are differently affected by epinephrine (E), cocaine (C) and verapamil (V). E antagonizes Ca but not Ba while C inhibits only Ba. The antagonism of V is greater towards Ba than Ca. The different influence of the drugs disappear in the excess potassium-depolarized duodenum. Thus, C and V block equally Ca and Ba, while E is only slightly effective against the two cations.
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