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NHE8 plays an important role in mucosal protection via its effect on bacterial adhesion.

Journal article
Authors Chang Liu
Hua Xu
Bo Zhang
Malin E V Johansson
Jing Li
Gunnar C. Hansson
Fayez K Ghishan
Published in American journal of physiology. Cell physiology
Volume 305
Issue 1
Pages C121-8
ISSN 1522-1563
Publication year 2013
Published at Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology
Pages C121-8
Language en
Links dx.doi.org/10.1152/ajpcell.00101.20...
Keywords NHE8, mucosal layer, salmonella
Subject categories Basic Medicine

Abstract

The Na(+)/H(+) exchanger NHE8 is expressed on the apical membrane of intestinal epithelial cells and is particularly abundant in the colon. Our previous study showed that Muc2 expression was significantly reduced in NHE8-knockout (NHE8(-/-)) mice, suggesting that NHE8 plays a role in mucosal protection in the colon. The current study confirms and extends our studies on the role of NHE8 in mucosal protection. The number of bacteria attached on the distal colon was significantly increased in NHE8(-/-) mice compared with their wild-type littermates. As expected, IL-4 expression was markedly increased in NHE8(-/-) mice compared with wild-type mice. Immunohistochemistry showed disorganization in the mucin layer of NHE8(-/-) mice, suggesting a possible direct bacteria-epithelia interaction. Furthermore, NHE8(-/-) mice were susceptible to dextran sodium sulfate-induced mucosal injury. In wild-type mice, dextran sodium sulfate treatment inhibited colonic NHE8 expression. In Caco-2 cells, the absence of NHE8 expression resulted in higher adhesion rates of Salmonella typhimurium but not Lactobacillus plantarum. Similarly, in vivo, S. typhimurium adhesion rate was increased in NHE8(-/-) mice compared with wild-type mice. Our study suggests that NHE8 plays important roles in protecting intestinal epithelia from infectious bacterial adherence.

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