Acta Physiol Scand. 1978 Dec;104(4):469-78.

Inhibition of acetylcholine release in guinea pig ileum by adenosine.

Gustafsson L, Hedqvist P, Fredholm BB, Lundgren G.

Abstract

The effect of adenosine on cholinergic neuroeffector transmission was studied in the isolated guinea pig ileum. Adenosine caused a dose-dependent and inverse frequency-dependent inhibition of contraction responses to transmural nerve stimulation. Blockade of adrenergic neurotransmission did not alter the inhibitory effect of adenosine. Adenosine also inhibited contraction responses to serotonin, angiotensin and high potassium, but not the responses to acetylcholine, histamine or direct electrical stimulation of the smooth muscle cells. Adenosine had little effect on basal outflow of acetylcholine but inhibited markedly and reversibly the release of acetylcholine induced by nerve stimulation. Acetylcholine was determined with gas chromatography-mass spectrometry. The results provide direct evidence that adenosine inhibits cholinergic neuroeffector transmission in the gut by a prejunctional action on acetylcholine release. This may be of functional importance since adenine compounds are released during stimulation of intestinal nerves.

PMID:: 214999; [PubMed - indexed for MEDLINE]

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Cited by 6 PubMed Central articles

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