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Wip1 protects hydrogen peroxide-induced colonic epithelial barrier dysfunction
T Oshima1, M Sasaki, H Kataoka
1Department of Internal Medicine and Bioregulation, Nagoya City University Graduate School of Medical Sciences, Kawasumi, Mizuho, Nagoya 467-8601, Japan. t-oshima@hyo-med.ac.jp
Cellular and Molecular Life Sciences : CMLS
|October 30, 2007
Summary
Reactive oxygen species disrupt colonic epithelial tight junctions. Wip1 protein protects against this oxidative stress, preventing claudin-4 protein dislocalization and maintaining barrier function.
Area of Science:
- Gastroenterology
- Cell Biology
- Molecular Biology
Background:
- Tight junctions (TJs) form a crucial barrier in the colon.
- Reactive oxygen species (ROS) are implicated in inflammatory bowel diseases.
- The role of ROS in colonic epithelial TJ function is not well understood.
Purpose of the Study:
- To investigate the impact of oxidative stress on colonic epithelial TJs.
- To explore the protective role of p38 MAP kinase pathway and Wip1 in maintaining TJ integrity.
Main Methods:
- Utilized hydrogen peroxide (H2O2) to induce oxidative stress in colonic epithelial models.
- Employed p38 MAP kinase inhibitor (SB203580) and Wip1-expressing adenovirus.
- Analyzed changes in TJ protein localization (claudin-4) and permeability.
Main Results:
- Oxidative stress significantly increased colonic epithelial permeability.
- H2O2 altered claudin-4 localization from insoluble to soluble fractions and from apical TJs to lateral membranes.
- SB203580 and Wip1 attenuated H2O2-induced permeability and claudin-4 dislocalization.
Conclusions:
- Exogenous Wip1 protects against oxidative stress-mediated colonic mucosal permeability.
- Wip1 prevents H2O2-induced claudin-4 dislocalization, thereby preserving TJ integrity.
- The p38 MAP kinase pathway is a key mediator in oxidative stress-induced TJ dysfunction.
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