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Literature DB >> 19303862

Transcriptional regulation of the human Na+/H+ exchanger NHE3 by serotonin in intestinal epithelial cells.

Md Ruhul Amin¹, Leda Ghannad, Ahmad Othman, Ravinder K Gill, Pradeep K Dudeja, Krishnamurthy Ramaswamy, Jaleh Malakooti.

Abstract

Serotonin (5-HT) decreases NHE2 and NHE3 activities under acute conditions in human intestinal epithelial cells. Here, we have investigated the effects of 5-HT on expression of the human NHE3 gene and the mechanisms underlying its transcriptional regulation in differentiated C2BBe1 cells. Treatment of the human intestinal epithelial cell line, C2BBe1, with 5-HT (20 microM) resulted in a significant decrease in NHE3 mRNA and protein expression. In transient transfection studies, 5-HT repressed the NHE3 promoter activity by approximately 55%. The repression of the NHE3 promoter activity in response to 5-HT was accompanied by reduced DNA-binding activity of transcription factors Sp1 and Sp3 to the NHE3 promoter without alteration in their nuclear levels. Pharmacological inhibitors of protein kinase C reversed the inhibitory effect of 5-HT on the promoter activity. Our data indicate that 5-HT suppresses the transcriptional activity of the NHE3 promoter and this effect may be mediated by PKCalpha and modulation of DNA-binding affinities of Sp1 and Sp3.

Entities: CellLine Chemical Disease Gene Species

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Year: 2009 PMID： 19303862 PMCID： PMC2676776 DOI： 10.1016/j.bbrc.2009.03.087

Source DB: PubMed Journal: Biochem Biophys Res Commun ISSN： 0006-291X Impact factor: 3.575

21 in total

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