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Effect of 5-hydroxytryptamine and its antagonists on colonic smooth muscle of the rabbit.

Abstract：

:The effect of 5-hydroxytryptamine (5HT) was studied in circular and longitudinal muscle from the proximal and distal colon of New Zealand white rabbits. 5HT stimulated a dose-dependent isometric contraction of distal and proximal circular muscle that was greater than in distal longitudinal muscle (P less than 0.01). 5HT did not stimulate taenia coli longitudinal muscle. The EC50 for 5HT stimulation of distal circular muscle (-7.0 +/- 0.1), distal longitudinal muscle, and proximal circular muscle was similar. Methysergide dose-dependently inhibited the 5HT stimulation of both proximal and distal circular muscle. The IC50 for methysergide inhibition of 5HT (5 x 10(-7) M) stimulation was -5.5 +/- 0.2. Ketanserine and ICS 205-930 did not inhibit 5HT stimulation of colonic muscle. Tetrodotoxin (TTX) decreased the potency, but not the efficacy of 5HT stimulation of proximal and distal circular muscle. Atropine decreased the potency (EC50 = -6.6 +/- 0.1) (P less than 0.05) and the efficacy by 40%. Electrical field stimulation (EFS) caused an on-contraction and off-contraction of distal circular muscle and an on-contraction of proximal circular muscle. 5HT decreased the off-contraction of the distal circular muscle but did not affect the on-contraction of the other muscle strips. 5HT receptor antagonists did not affect EFS of the tissue. The studies suggest: (1) 5HT stimulates circular colonic muscle with greater efficacy than longitudinal muscle, (2) 5HT stimulates circular muscle through a 5HT1 receptor, (3) there is atropine-sensitive and atropine-insensitive 5HT stimulation of circular colonic muscle, (4) 5HT inhibits neurons responsible for the off-contraction in distal circular muscle without affecting the on-contraction.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Dig Dis Sci

journal_title

Digestive diseases and sciences

authors

Ng WW,Jing J,Hyman PE,Snape WJ Jr

doi

10.1007/BF01300751

subject

Has Abstract

pub_date

1991-02-01 00:00:00

pages

168-73

issue

2

eissn

0163-2116

issn

1573-2568

journal_volume

36

pub_type

杂志文章

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