Effects of calcium entry blocking agents on 5-hydroxytryptamine- and noradrenaline-induced contractions of rat isolated jugular vein and aorta

Naunyn-Schmiedeberg's Archives of Pharmacology
M A GouwP A van Zwieten

Abstract

We calculated the contribution of the intracellular releasable calcium pool to the contractile responses induced by 5-hydroxytryptamine (5-HT) and noradrenaline (NA) by constructing time-response curves to the agonists in Ca2+-deficient medium in the isolated rat jugular vein and aorta. Biexponential curves were obtained compatible with a two compartment model. In the aorta the intracellular calcium pools are likely to be different for both 5-HT and NA. Moreover, we investigated the effect of maximally effective concentrations of calcium entry blocking agents (CEB's) on K+, 5-HT- and NA-induced contractions in Ca2+-containing medium. Only a moderate inhibiting effect of nifedipine, diltiazem, flunarizine and gallopamil on 5-HT- and NA-induced Ca2+ influx could be observed; in contrast, K+-induced Ca2+ influx could be antagonized completely. The calculated contribution of intracellular Ca2+ to 5-HT- and NA-induced contractions, obtained from the experiments in Ca2+-"free" medium was much lower than that obtained after pretreatment with CEB's, leading to the conclusion that after CEB-pretreatment a Ca2+ influx component persists. This hypothesis was supported by the observation that contractions in Ca2+-"free" medium consist of a...Continue Reading

References

Nov 1, 1977·The Journal of Physiology·C Van Breemen
Jan 1, 1988·Life Sciences·H Karaki, G B Weiss
Sep 1, 1987·British Journal of Pharmacology·C DacquetJ Mironneau
Jun 1, 1973·Circulation Research·D F Bohr
Jan 1, 1984·Journal of Cardiovascular Pharmacology·C CauvinC van Breemen
Jul 1, 1980·Circulation Research·S WallensteinJ L Fleiss

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Citations

Jan 1, 1993·Fundamental & Clinical Pharmacology·P N van Heiningen, P A van Zwieten

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