Journal of Applied Physiology
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J Appl Physiol 62: 785-790, 1987;
8750-7587/87 $5.00
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Journal of Applied Physiology, Vol 62, Issue 2 785-790, Copyright © 1987 by American Physiological Society

ARTICLES

Prejunctional beta 1-adrenoceptors inhibit cholinergic transmission in canine bronchi

A. H. Danser, R. van den Ende, R. R. Lorenz, N. A. Flavahan and P. M. Vanhoutte

The aim of the present study was to determine in canine bronchi the effects produced by norepinephrine (released from adrenergic nerve terminals) on cholinergic neurotransmission. Electrical stimulation of canine bronchi activates cholinergic and adrenergic nerve fibers. The adrenergic neuronal blocker, bretylium tosylate, inhibited the increase in [3H]norepinephrine overflow evoked by electrical stimulation but did not prevent that caused by the indirect sympathomimetic tyramine. During blockade of the exocytotic release of norepinephrine with bretylium, the pharmacological displacement of the sympathetic neurotransmitter by tyramine significantly decreased the contractions evoked by electrical stimulation but did not affect contractions caused by exogenous acetylcholine. Metoprolol, a beta 1-adrenergic antagonist, abolished and propranolol significantly reduced the effect of tyramine during electrical stimulation. alpha 2-Adrenergic blockade, beta 2-adrenergic blockade, or removal of the epithelium did not significantly affect the response to tyramine. These results suggest that norepinephrine when released from sympathetic nerve endings can activate prejunctional inhibitory beta 1-adrenoceptors to depress cholinergic neurotransmission in the bronchial wall.


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L. Brichetto, P. Song, E. Crimi, K. Rehder, and V. Brusasco
Modulation of cholinergic responsiveness through the {beta}-adrenoceptor signal transmission pathway in bovine trachealis
J Appl Physiol, August 1, 2003; 95(2): 735 - 741.
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