| Affiliation: | (1) Department of General Medicine and Clinical Pharmacotherapy, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan;(2) Department of General Medicine and Clinical Pharmacotherapy, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan |
| Abstract: | Primary sclerosing cholangitis is often complicated by ulcerative colitis. Recently, we reported on Th1-dominant cholangitis associated with experimental colitis, and natural killer T (NKT) cells might play an important role in this model. The aim of this study was to clarify the immunopathogenic role of NKT cells in this model using α-galactosylceramide. CD-1 mice were administered 2.0% dextran sulfate sodium for 29 days and injection of α-galactosylceramide was performed every 5 days, then inflammation was assessed. Mononuclear cells from the liver were analyzed with respect to cytokine production and the surface marker. α -Galactosylceramide improved survival rate, weight gain, and inflammation score. Also, interferon-γ release from MNC, CD4/CD8 ratio, NKT cell population, and NK cell population were decreased by this treatment. These findings indicate that repeated stimulation of NKT cells modifies the Th1/Th2 balance to reduce Th1 dominance, and this may be a mechanism by which α -galactosylceramide has a therapeutic effect. |
