Effect of cadmium on contractile response to spasmogens in vascular and nonvascular tissues
Balaraman, R.; Rathod, S.P.; Gulati, O.D.
Indian Journal of Experimental Biology 28(5): 455-459
1990
ISSN/ISBN: 0019-5189 PMID: 2401519 Document Number: 351147
In rat isolated aorta low concentration of CdCl2 (4.8 .times. 10-8 M) produced a significant increase in pD2 value of KCl and noradrenaline (NA) with an increase in the maxima, while higher concentrations of CdCl2 (1.44 .times. 10-5 M) produced a significant rightward shift of the dose-response curve with a depression of maxima. In rat isolated portal vein 4.8 .times. 10-7 M CdCl2 produced a significant increase in the pD2 value of KCl with an increase in the maxima, while higher concentration of CdCl2 (4.8 .times. 10-5 M) produced a significant rightward shift of the dose-response curve of KCl and NA with a depression of maxima. In rat isolated vas deferens and anococcygeus muscle 4.8 .times. 10-8 M CdCl2 produced a significant increase in pD2 value of KCl with an increase in the maxima, while higher concentrations of CdCl2 (4.8 .times. 10-6 M and 1.44 .times. 10-5 M) produced a significant rightward shift of the dose-response curve of KCl and NA. It is suggested that enhancement and reduction of response to KCl and NA, in presence of different concentrations of CdCl2 might be due to the alteration in the fluxes of calcium ion since these spasmogens produce their action by increasing the availability of calcium ions for the contractile machinary.