Actions of dopamine and apomorphine on the vasoconstrictor responses of perfused mesenteric arteries of mouse, rat and rabbit
- 1 September 1981
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Pharmacy and Pharmacology
- Vol. 33 (1), 150-154
- https://doi.org/10.1111/j.2042-7158.1981.tb13738.x
Abstract
Dopamine (10−7-10−6 m) and apomorphine (5 × 10−7 − 5 × 10−6 m) inhibited the vasoconstrictor responses of the perfused mesenteric artery preparations of rat, rabbit and mouse to adrenergic nerve stimulation but did not affect responses to added noradrenaline. The inhibitory effects of both dopamine and apomorphine were prevented by haloperidol (3 × 10−7 m) but not by yohimbine (3 × 10−8 m) in rat and rabbit mesenteric artery preparations. In contrast, yohimbine (3 × 10−8 m), but not haloperidol, antagonized the inhibitory effect of dopamine and apomorphine in mouse mesenteric artery preparations. In higher concentrations, dopamine (10−6 − 10−4 m) produced a direct vascoconstrictor effect, which involved post-junctional α-adrenoceptors in all three species. However, in preparations contracted with 10−7 m 5-hydroxytryptamine and in the presence of phentolamine (3 × 10−7 m) and propranolol (10−6 m), dopamine (10−6 − 10−4 m) produced a direct relaxant effect in rabbit mesenteric artery preparations but not in those of rat and mouse. It is suggested that inhibition of neurogenic vasoconstrictor responses, by dopamine and apomorphine, may be mediated through a specific prejunctional inhibitory dopamine receptor in the mesenteric artery of rat and rabbit whereas in the mouse they involve activation of α-adrenoceptors.This publication has 9 references indexed in Scilit:
- MODULATION OF NORADRENERGIC TRANSMISSION IN THE RABBIT EAR ARTERY BY DOPAMINEBritish Journal of Pharmacology, 1978
- A Comparison of the Vascular Dopamine Receptor with Other Dopamine ReceptorsAnnual Review of Pharmacology and Toxicology, 1978
- Selectivity for catecholamines of presynaptic alpha-receptors involved in feedback control of sympathetic neurotransmitter secretion in guinea-pig vas deferensNaunyn-Schmiedebergs Archiv für experimentelle Pathologie und Pharmakologie, 1975
- Inhibition by dopamine of 3H-noradrenaline release elicited by nerve stimulation in the isolated cat's nictitating membraneNaunyn-Schmiedebergs Archiv für experimentelle Pathologie und Pharmakologie, 1975
- Presynaptic regulation of catecholamine releaseBiochemical Pharmacology, 1974
- PROCEEDINGS OF THE BRITISH PHARMACOLOGICAL SOCIETYBritish Journal of Pharmacology, 1973
- Effects of dopamine, noradrenaline and 5-hydroxytryptamine on the cerebral blood flow in the dogJournal of Pharmacy and Pharmacology, 1972
- A new and sensitive bioassay for catecholaminesJournal of Pharmacy and Pharmacology, 1965
- The effect of sympathetic nerve stimulation on vasoconstrictor responses in perfused mesenteric blood vessels of the ratThe Journal of Physiology, 1965