Relation Between Catecholamine-induced Cyclic AMP Changes and Hyperpolarization in Isolated Rat Sympathetic Ganglia

Overview

Journal J Physiol

Specialty Physiology

Date 1979 May 1

PMID 224171

Citations 11

Authors

D A Brown

M P Caulfield

P J Kirby

Affiliations

Soon will be listed here.

Abstract

1. The effect of catecholamines on cyclic adenosine 3'5'-monophosphate (cyclic AMP) production in isolated rat superior cervical ganglia has been measured under experimental conditions in which they also produce ganglion hyperpolarization.2. (+/-)Isoprenaline (1 muM) increased cyclic AMP levels by 8-100 times after 15 min incubation at 25 degrees C. Half-maximal stimulation occurred at about 0.03 muM. This was due to stimulation of beta-receptors, since it was prevented by 1 muM-propranolol but not by 1 muM-phentolamine.3. The alpha-agonists phenylephrine (100 muM), dopamine (100 muM) and clonidine (1 muM) did not produce a detectable increase in ganglionic cyclic AMP. Dopamine (100 muM) was also ineffective at 37 degrees C in the presence of 10 mM-theophylline.4. Exogenous cyclic AMP (0.01-1 mM) hyperpolarized the ganglion. This effect was replicated by other adenosine compounds, most effectively by adenosine and by adenosine 5'-monophosphate, and was antagonized by theophylline. Dibutyryl cyclic AMP was weaker than cyclic AMP.5. Neither theophylline nor the non-xanthine phosphodiesterase inhibitor, Ro 20-1724, enhanced the hyperpolarizing actions of noradrenaline or dopamine.6. Since catecholamine-induced hyperpolarization of the isolated rat ganglion is induced via alpha-receptors, whereas cyclic AMP-production is induced via beta-receptors, it is concluded that cyclic AMP is unlikely to mediate the hyperpolarization. The effect of exogenous cyclic AMP may be due to an action on external adenosine-receptors.

Citing Articles

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Characterization of the adenosine receptors of the rat superior cervical ganglion.

Connolly G, Stone T, Brown F Br J Pharmacol. 1993; 110(2):854-60.

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Muscarinic inhibition of sympathetic C neurones in the bullfrog.

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Cyclic adenosine 3',5'-monophosphate and beta-effects in rat isolated superior cervical ganglia.

Brown D, Dunn P Br J Pharmacol. 1983; 79(2):441-9.

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The ionic basis of adenosine receptor actions on post-ganglionic neurones in the rat.

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