title: 5-Aminosalicylic acid inhibits the impaired epithelial barrier function induced by gamma interferon.
abstract: Gamma interferon (IFN gamma) impairs epithelial barrier function and induces HLA-DR expression on colonic cancer cell lines. Salicylates have been shown to reduce IFN gamma induced HLA-DR expression. The effect of 5-aminosalicylic acid (5-ASA) on IFN gamma induced changes in transepithelial resistance and permeability was investigated in HT29 clone 19A and Caco 2 monolayers. Monolayers were incubated with different concentrations of IFN gamma (100, 500, 1000, and 3000 U/ml) and 5-ASA. IFN gamma induced class II expression in a time and dose dependent manner in HT29:19A but not Caco 2 cells. HT29:19A monolayers incubated with both IFN gamma and 5-ASA showed lower HLA-DR expression compared with monolayers incubated with IFN gamma alone. Electrical resistance and 14C-mannitol flux across HT29:19A monolayers were significantly changed by IFN gamma. Addition of both IFN gamma and 5-ASA to the basolateral surface of the monolayers significantly reduced paracellular permeability compared with addition of IFN gamma alone. These data show that IFN gamma is able to induce HLA-DR expression and to impair the barrier function of HT29:19A monolayers, and that 5-ASA reduces IFN gamma induced HLA-DR expression and inhibits the effects of IFN gamma on epithelial barrier function.
authors.affiliation: Gastroenterology Unit, Radcliffe Infirmary, Oxford.
authors.forename: M C
authors.initials: MC
authors.lastname: Di Paolo
authors.forename: M N
authors.initials: MN
authors.lastname: Merrett
authors.forename: B
authors.initials: B
authors.lastname: Crotty
authors.forename: D P
authors.initials: DP
authors.lastname: Jewell
mesh_terms: D000636:Aminosalicylic Acids / Q000494:pharmacology*; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D018938:Caco-2 Cells / Q000187:drug effects / Q000378:metabolism; D004848:Epithelium / Q000187:drug effects / Q000378:metabolism; D015870:Gene Expression / Q000235:genetics; D006684:HLA-DR Antigens / Q000378:metabolism*; D019073:HT29 Cells / Q000187:drug effects; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism; D007371:Interferon-gamma / Q000494:pharmacology*; D019804:Mesalamine
chemical_list: D000636:Aminosalicylic Acids; D000894:Anti-Inflammatory Agents, Non-Steroidal; D006684:HLA-DR Antigens; D018799:Intercellular Adhesion Molecule-1; D019804:Mesalamine; D007371:Interferon-gamma