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* Department of Pathology and Laboratory Medicine, Epithelial Pathobiology Research Unit, Emory University, Atlanta, GA, 30322; Departments of
General Surgery and
Medicine B, University of Muenster, Muenster, Germany; and
Pritzker School of Medicine, University of Chicago, Chicago, IL
It is well known that inflammatory conditions of the intestinal mucosa result in compromised barrier function. Inflammation is characterized by an influx into the mucosa of immune cells that influence epithelial function by releasing proinflammatory cytokines such as IFN-
and TNF-
. Mucosal barrier function is regulated by the epithelial apical junctional complex (AJC) consisting of the tight junction and the adherens junction. Since the AJC regulates barrier function, we analyzed the influence of IFN- and TNF- on its structure/function and determined the contribution of apoptosis to this process using a model intestinal epithelial cell line, T84, and IFN- and TNF-. AJC structure/function was analyzed by confocal microscopy, biochemical analysis, and physiologic measurement of epithelial gate/fence function. Apoptosis was monitored by determining cytokeratin 18 cleavage and caspase-3 activation. IFN- induced time-dependent disruptions in epithelial gate function that were potentiated by coincubation with TNF-. Tight junction fence function was somewhat disrupted. Cytokine treatment was associated with internalization of AJC transmembrane proteins, junction adhesion molecule 1, occludin, and claudin-1/4 with minimal effects on the cytoplasmic plaque protein zonula occludens 1. Detergent solubility profiles of junction adhesion molecule 1 and E-cadherin and their affiliation with "raft-like" membrane microdomains were modified by these cytokines. Inhibition of cytokine-induced apoptosis did not block induced permeability defects; further emphasizing their primary influence on the epithelial AJC structure and barrier function. Our findings for the first time clearly separate the proapoptotic effects of IFN- and TNF- from their abilities to disrupt barrier function.
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