Exogenous serotonin regulates proliferation of interstitial cells of Cajal in mouse jejunum through 5-HT2B receptors

Gastroenterology
M M WoutersGianrico Farrugia

Abstract

Interstitial cells of Cajal (ICC) are required for normal gastrointestinal motility. Loss of ICC is associated with several motility disorders. The mechanisms modulating ICC survival and proliferation are poorly understood. This study aimed to establish whether 5-hydroxytryptamine (5-HT) plays a role in regulating ICC proliferation. Expression of 5-HT receptor mRNA was investigated in muscle strips, in purified populations of ICC, and in identified single cells. The effect of 5-HT(2B) receptor ligands on ICC numbers was studied in primary cell cultures. Proliferation of ICC was determined by counting Ki67-positive cells in culture. Of the 5-HT receptors known to be involved in proliferation, 5-HT(2B) receptor mRNA was detected by reverse transcriptase-polymerase chain reaction (RT-PCR) in jejunal muscle, whereas 5-HT(1A), 5-HT(1D), and 5-HT(2C) receptor mRNAs were not. 5-HT(2B) receptor mRNA was found in single ICC and cells purified by flow cytometry. Exogenous 5-HT (1 micromol/L) increased (66% +/- 9%, P < .005) ICC numbers in culture. The 5-HT(2) receptor antagonist, ritanserin, and the 5-HT(2B) receptor antagonist, SB204741, inhibited the effect of 5-HT. The 5-HT(2B) receptor agonist BW 723C86 induced a concentration-depend...Continue Reading

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Related Concepts

BW 723C86
SB204741
Cell Survival
Indoles
Jejunum
Mice, Inbred BALB C
Mice, Inbred Strains
Poly(A) Tail
Hydroxytryptamine
Serotonin Antagonists

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