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MicroRNA 29 targets nuclear factor-κB-repressing factor and Claudin 1 to increase intestinal permeability.

Abstract：

BACKGROUND & AIMS:Some patients with irritable bowel syndrome with diarrhea (IBS-D) have intestinal hyperpermeability, which contributes to their diarrhea and abdominal pain. MicroRNA 29 (MIR29) regulates intestinal permeability in patients with IBS-D. We investigated and searched for targets of MIR29 and investigated the effects of disrupting Mir29 in mice. METHODS:We investigated expression MIR29A and B in intestinal biopsies collected during endoscopy from patients with IBS (n = 183) and without IBS (controls) (n = 36). Levels were correlated with disease phenotype. We also generated and studied Mir29(-/-) mice, in which expression of Mir29a and b, but not c, is lost. Colitis was induced by administration of 2,4,6-trinitrobenzenesulfonic acid; intestinal tissues were collected and permeability was assessed. Microarray analysis was performed using tissues from Mir29(-/-) mice. Changes in levels of target genes were measured in human colonic epithelial cells and small intestinal epithelial cells after knockdown of MIR29 with anti-MIRs. RESULTS:Intestinal tissues from patients with IBS-D (but not IBS with constipation or controls) had increased levels of MIR29A and B, but reduced levels of Claudin-1 (CLDN1) and nuclear factor-κB-repressing factor (NKRF). Induction of colitis and water avoidance stress increased levels of Mir29a and Mir29b and intestinal permeability in wild-type mice; these increased intestinal permeability in colons of far fewer Mir29(-/-) mice. In microarray and knockdown experiments, MIR29A and B were found to reduce levels of NKRF and CLDN1 messenger RNA, and alter levels of other messenger RNAs that regulate intestinal permeability. CONCLUSIONS:Based on experiments in knockout mice and analyses of intestinal tissue samples from patients with IBS-D, MIR29 targets and reduces expression of CLDN1 and NKRF to increase intestinal permeability. Strategies to block MIR29 might be developed to restore intestinal permeability in patients with IBS-D.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Zhou Q,Costinean S,Croce CM,Brasier AR,Merwat S,Larson SA,Basra S,Verne GN

doi

10.1053/j.gastro.2014.09.037

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

158-169.e8

issue

1

eissn

0016-5085

issn

1528-0012

pii

S0016-5085(14)01191-3

journal_volume

148

pub_type

杂志文章

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