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. 1991 Dec;104(4):817–822. doi: 10.1111/j.1476-5381.1991.tb12512.x

Evidence for inhibition of sympathetic neurotransmission by endogenously released acetylcholine in the guinea-pig trachea.

Y D Pendry 1, J Maclagan 1
PMCID: PMC1908860  PMID: 1667287

Abstract

1. Interactions between pulmonary cholinergic and noradrenergic nerves were studied in the innervated tracheal tube preparation isolated from guinea-pigs anaesthetized with urethane. Relaxations of the trachealis smooth muscle in response to postganglionic stimulation of the sympathetic nerve were recorded as decreases in the intraluminal pressure of the tracheal tube after the pressure had been raised with the stable thromboxane-mimetic, U46619. In contrast, contractions following preganglionic stimulation of the vagal nerve trunk were recorded as increases in intraluminal pressure. 2. In approximately half of the preparations studied, concurrent stimulation of of the vagal nerve trunk the vagal nerve trunk inhibited relaxation responses elicited by stimulation of the sympathetic nerves. The vagi were stimulated at parameters which caused no change in intraluminal pressure, excluding the involvement of postjunctional mechanisms. 3. The effect of simultaneous stimulation of the sympathetic nerve trunk was studied on contractile responses evoked by preganglionic stimulation of the vagus nerve. In 80% of the preparations tested the vagal responses were inhibited. This inhibitory effect of sympathetic nerve stimulation was antagonized by propranolol. 4. The potassium channel agonist, cromakalim, endothelins 1 and 3 and the neuropeptides, vasoactive intestinal peptide, neurokinin A and substance P, did not significantly modulate sympathetic nerve-induced relaxations. 5. The anticholinesterase drug, physostigmine, induced a concentration-dependent increase in the intraluminal pressure of the tracheal tube and potentiated the postjunctional action of exogenously applied acetylcholine to contract the guinea-pig trachealis muscle. In the presence of higher concentrations of physostigmine both vagally-induced contractions and sympathetic nerve-induced relaxations were reduced.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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