IFN-γ–Mediated Induction of an Apical IL-10 Receptor on Polarized Intestinal Epithelia
IFN-γ–Mediated Induction of an Apical IL-10 Receptor on Polarized Intestinal Epithelia
Abstract Cytokines secreted at sites of inflammation impact the onset, progression, and resolution of inflammation. In this article, we investigated potential proresolving mechanisms of IFN-γ in models of inflammatory bowel disease. Guided by initial microarray analysis, in vitro studies revealed that IFN-γ selectively induced the expression of IL-10R1 on intestinal epithelia. Further analysis revealed that IL-10R1 was expressed predominantly on the apical membrane of polarized epithelial cells. Receptor activation functionally induced canonical IL-10 target gene expression in epithelia, concomitant with enhanced barrier restitution. Furthermore, knockdown of IL-10R1 in intestinal epithelial cells results in impaired barrier function in vitro. Colonic tissue isolated from murine colitis revealed that levels of IL-10R1 and suppressor of cytokine signaling 3 were increased in the epithelium and coincided with increased tissue IFN-γ and IL-10 cytokines. In parallel, studies showed that treatment of mice with rIFN-γ was sufficient to drive expression of IL-10R1 in the colonic epithelium. Studies of dextran sodium sulfate colitis in intestinal epithelial-specific IL-10R1–null mice revealed a remarkable increase in disease susceptibility associated with increased intestinal permeability. Together, these results provide novel insight into the crucial and underappreciated role of epithelial IL-10 signaling in the maintenance and restitution of epithelial barrier and of the temporal regulation of these pathways by IFN-γ.
- University of Salford United Kingdom
- University of Colorado Anschutz Medical Campus United States
- Helmholtz Association of German Research Centres Germany
- Otto-von-Guericke University Magdeburg Germany
- Helmholtz Center for Information Security Germany
STAT3 Transcription Factor, Dextran Sulfate, Interleukin-10 Receptor alpha Subunit, Cell Polarity, Dextrans, Epithelial Cells, Colitis, Permeability, Recombinant Proteins, Cell Line, Interleukin-10, Mice, Inbred C57BL, Interferon-gamma, Mice, Gene Expression Regulation, Animals, Cytokines, Humans, Intestinal Mucosa, Fluorescein-5-isothiocyanate
STAT3 Transcription Factor, Dextran Sulfate, Interleukin-10 Receptor alpha Subunit, Cell Polarity, Dextrans, Epithelial Cells, Colitis, Permeability, Recombinant Proteins, Cell Line, Interleukin-10, Mice, Inbred C57BL, Interferon-gamma, Mice, Gene Expression Regulation, Animals, Cytokines, Humans, Intestinal Mucosa, Fluorescein-5-isothiocyanate
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