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Pharmacological analysis of rebound excitation in large intestine of piebald mouse model for Hirschsprung's disease.

Abstract：

:Pharmacological agents that might influence the poststimulus rebound contractile response (PSRR) through an action on the intrinsic inhibitory innervation of the circular muscle coat were studied in the large intestine of the piebald mouse model for Hirschsprung's disease. Tetrodotoxin (0.3-3 microM) suppressed, in a dose-dependent manner, the amplitude, duration, and area under the contractile traces of the PSRR and increased the latency for the response in ganglionated segments of the large intestine of piebald and normal mice. Sensitivity to tetrodotoxin was greater in the megacolon of piebald mice than in the colon of normal mice. Norepinephrine (6-360 microM) suppressed all parameters of the PSRR in ganglionated regions of the large intestine of abnormal mice. Sensitivity to norepinephrine was greater in the megacolon than in the colon of normal mice. Norepinephrine abolished spontaneous contractile behavior in ganglionated regions of the large intestine of normal and diseased mice and in the aganglionic segment of the piebald mice. Suppression of the PSRR by phentolamine and propranolol were interpreted as nonspecific local anesthetic effects. Atropine (20-200 microM) increased the area under the contractile traces in the midcolon of the intestine of both normal and piebald mice and had no effects on the terminal segment of the large intestine of normal mice. Spontaneous contractile activity and baseline tension were increased by atropine (350 microM) in all preparations. The nicotinic agonist, DMPP (3-157 microM), suppressed the PSRR in the ganglionated regions of the bowel from both normal and abnormal mice. DMPP relaxed resting tension in ganglionated regions, but did not affect the aganglionic terminal segment of the piebald mouse.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Dig Dis Sci

journal_title

Digestive diseases and sciences

authors

Wood JD,Brann LR

doi

10.1007/BF01296453

subject

Has Abstract

pub_date

1986-07-01 00:00:00

pages

744-52

issue

7

eissn

0163-2116

issn

1573-2568

journal_volume

31

pub_type

杂志文章

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