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

• Published in: Naunyn-Schmiedeberg's archives of pharmacology 1989-05, Vol.339 (5), p.533-539
• Main Authors: GOUW, M. A. M, WILFFERT, B, VAN ZWIETEN, P. A
• Format: Article
• Language: English
• Subjects: Animals; Aorta, Thoracic - drug effects; Biological and medical sciences; calcium; Calcium - physiology; Calcium Channel Blockers - pharmacology; Cardiovascular system; Edetic Acid - pharmacology; Half-Life; In Vitro Techniques; Jugular Veins - drug effects; Male; Medical sciences; Miscellaneous; Muscle Contraction - drug effects; Muscle, Smooth, Vascular - drug effects; norepinephrine; Norepinephrine - pharmacology; Pharmacology. Drug treatments; Potassium - pharmacology; Rats; Rats, Inbred Strains; Serotonin - pharmacology
• ISSN: 0028-1298; 1432-1912
• DOI: 10.1007/BF00167257

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 monophasic, fast response only, whereas after CEB-pretreatment a response similar to the control, including a slow, sustained component, was obtained. The Ca2+ influx component not affected by maximally effective concentrations of CEB's seems to represent an inflow of extracellular Ca2+ directly into the cytosol and not into an intracellular calcium store.