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Published on: September 9, 2011
Interferon-gamma induces a cell surface phenotype switch on T84 intestinal epithelial cells
S P Colgan1, C A Parkos, J B Matthews
1Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts.
The American Journal of Physiology
|August 1, 1994
Summary
Interferon-gamma (IFN-gamma) reduces intestinal epithelial chloride secretion by downregulating key ion transport proteins. This immune cytokine also increases major histocompatibility complex (MHC) expression and promotes neutrophil adhesion.
Area of Science:
- Immunology
- Gastroenterology
- Cell Biology
Background:
- Intestinal epithelia interact closely with lymphocytes, which release cytokines like interferon-gamma (IFN-gamma) during inflammation.
- Intraepithelial lymphocytes increase during inflammation and produce cytokines, including IFN-gamma.
Purpose of the Study:
- To investigate the effects of recombinant human IFN-gamma on ion transport in T84 intestinal epithelial cells.
- To understand how IFN-gamma influences chloride secretion and related cellular mechanisms.
Main Methods:
- Assessed chloride secretion using short-circuit current (ISC) measurements in T84 cells.
- Utilized efflux and uptake studies to analyze cell surface transport proteins.
- Performed [3H]bumetanide binding assays and surface immunofluorescence.
- Conducted neutrophil-epithelial adhesion assays.
Main Results:
- IFN-gamma significantly attenuated stimulated chloride secretion across T84 cell monolayers.
- Functional downregulation of apical Cl- channels and basolateral transporters (Na(+)-K(+)-2Cl- cotransporter, K+ channels, Na-K-ATPase) was observed.
- Surface expression of the Na(+)-K(+)-2Cl- cotransporter decreased by over 70%.
- IFN-gamma induced Major Histocompatibility Complex (MHC) class I and class II expression and promoted beta 2-integrin-dependent neutrophil adhesion.
Conclusions:
- IFN-gamma impairs intestinal epithelial ion transport and barrier function.
- IFN-gamma modulates epithelial cell surface protein expression and enhances immune cell interactions.
- These findings highlight IFN-gamma's role in inflammatory responses within the intestinal epithelium.
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