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Br J Pharmacol. 1990 Aug;100(4):665-7.

Mediation of 5-hydroxytryptamine-induced tachycardia in the pig by the putative 5-HT4 receptor.

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  • 1Department of Pharmacology, Faculty of Medicine and Health Sciences, Erasmus University Rotterdam, The Netherlands.

Abstract

Intravenous bolus injections of 5-hydroxytryptamine (5-HT; 3, 10 and 30 micrograms kg-1), 5-methoxytryptamine (5-MeO-T; 3, 10 and 30 micrograms kg-1), renzapride (BRL 24924; 3, 10, 30 and 100 micrograms kg-1) and isoprenaline (0.03, 0.1 and 0.3 micrograms kg-1) to anaesthetized pigs increased heart rate by, respectively, 22 +/- 3, 44 +/- 3 and 65 +/- 4 beats min-1 (5-HT; n = 17); 12 +/- 1, 26 +/- 2 and 44 +/- 4 beats min-1 (5-MeO-T; n = 15), 5 +/- 2, 11 +/- 2, 18 +/- 4 and 37 +/- 5 beats min-1 (renzapride; n = 8) and 17 +/- 2, 46 +/- 3 and 75 +/- 3 beats min-1 (isoprenaline; n = 13). The responses to 5-HT, 5-MeO-T and renzapride were antagonized by ICS 205-930 (1 and 3 mg kg-1, i.v.), which did not modify the increases in heart rate by isoprenaline. Renzapride showed tachyphylaxis and attenuated the responses to 5-HT. These findings indicate that 5-HT elicits tachycardia in the pig by acting on a novel receptor, either similar or identical to the 5-HT4 receptor identified in mouse brain colliculi.

PMID:
2207493
PMCID:
PMC1917582
[PubMed - indexed for MEDLINE]
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