5-HT7 receptors mediate the inhibitory effect of 5-HT on peristalsis in the isolated guinea-pig ileum.

Abstract:

:The study was undertaken to investigate the 5-HT receptor mediating the inhibitory effect of 5-HT on peristalsis in the guinea-pig isolated ileum. The facilitatory and inhibitory effects were measured as the decrease and increase, respectively, in the intraluminal pressure required to trigger peristalsis. In the presence of 5-HT(2/3&4) receptor antagonists ketanserin (0.1 micro M), granisetron (1 micro M) and SB-204070 (1 micro M), a cumulative addition (0.1-100 micro M) of 5-HT or 5-carboxamidotryptamine, but not 2-methyl-5-HT produced a concentration-dependent increase in the threshold required to trigger peristalsis. The 5-HT(7) receptor selective antagonist SB-269970-A (0.01-1 micro M) or methiothepin (0.01-0.1 micro M) concentration-dependently antagonised this response to 5-HT. SB-269970-A (1 micro M) and methiothepin (1 micro M) were also able to restore peristalsis in tissues in which peristalsis was inhibited by a prior addition of 30 micro M of 5-HT. The results indicate an involvement of 5-HT(7) receptors in the inhibitory effect of 5-HT on peristalsis in the guinea-pig ileum.

journal_name

Br J Pharmacol

authors

Tuladhar BR,Ge L,Naylor RJ

doi

10.1038/sj.bjp.0705184

subject

Has Abstract

pub_date

2003-04-01 00:00:00

pages

1210-4

issue

7

eissn

0007-1188

issn

1476-5381

journal_volume

138

pub_type

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