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Neuropeptide Y inhibits excitatory enteric neurons supplying the circular muscle of the guinea pig small intestine.

Abstract：

:The effect of neuropeptide Y on the motor activity of the circular and longitudinal muscle of the guinea pig small intestine was investigated. Neuropeptide Y (0.3-30 nM) inhibited, in a concentration-dependent manner, the ascending enteric reflex contraction of the circular muscle; both the cholinergic and noncholinergic component of the ascending enteric reflex were suppressed. Neuropeptide Y also blocked nerve-mediated phasic contractions of the circular muscle, induced by dimethylphenylpiperazinium or ceruletide, and abolished the peristaltic movements of the small intestine. Nerve-mediated cholinergic and noncholinergic contractions of the longitudinal muscle, induced by electrical field stimulation, were only slightly depressed by neuropeptide Y. Further analysis showed that neuropeptide Y did not act directly on intestinal muscle but interrupted excitatory pathways of the enteric nervous system. The effect of neuropeptide Y did not involve activation of alpha-adrenoceptors, opioid receptors, or P1 purinoceptors or the release of endogenous factors stimulating these receptors. These findings suggest a possible physiologic role of neuropeptide Y as a nonnoradrenergic inhibitory transmitter involved in the enteric nervous control of intestinal circular muscle activity.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Holzer P,Lippe IT,Barthó L,Saria A

doi

10.1016/0016-5085(87)90628-7

subject

Has Abstract

pub_date

1987-06-01 00:00:00

pages

1944-50

issue

6

eissn

0016-5085

issn

1528-0012

pii

0016-5085(87)90628-7

journal_volume

92

pub_type

杂志文章

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