[The effect of biologically active substances (acetylcholine, histamine and bradykinin) on depolarization of taenia coli smooth muscle].

In experiments on the isolated strips of Taenia coli of guinea pigs it was shown that compound D-600 depressed the acetylcholine (5-10(-6), histamine (2-10(-6) and bradykinin (10(-5) gl/ml)-induced contractile response of depolarized smooth muscle. Along with depression of the drug-induced response, compound D-600 depressed the "potassium contracture". It is supposed that the mentioned agents activated the inward flow of Ca2+ ions through the membrane, but not the release of these ions from the sarcoplasmic reticulum.