title: Critical contribution of liver natural killer T cells to a murine model of hepatitis.
abstract: Natural killer T (NKT) cells constitute a distinct subpopulation of T cells with a unique antigen specificity, prompt effector functions, and an unusual tissue distribution. NKT cells are especially abundant in the liver, but their physiological function in this organ remains unclear. In the present study, we examined the possible contribution of NKT cells to a murine model of hepatitis induced by i.v. injection of Con A. CD1-deficient mice lacking NKT cells were highly resistant to Con A-induced hepatitis. Adoptive transfer of hepatic NKT cells isolated from wild-type mice, but not from FasL-deficient gld mice, sensitized CD1-deficient mice to Con A-induced hepatitis. Furthermore, adoptive transfer of hepatic mononuclear cells from wild-type mice, but not from CD1-deficient mice, sensitized gld mice to Con A-induced hepatitis. Upon Con A administration, hepatic NKT cells rapidly up-regulated cell surface FasL expression and FasL-mediated cytotoxicity. At the same time, NKT cells underwent apoptosis leading to their rapid disappearance in the liver. These results implicated FasL expression on liver NKT cells in the pathogenesis of Con A-induced hepatitis, suggesting a similar pathogenic role in human liver diseases such as autoimmune hepatitis.
authors.affiliation: Department of Immunology, Juntendo University School of Medicine, Bunkyo-ku, Tokyo 113-8421, Japan. ktakeda@med.juntendo.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Takeda
authors.forename: Y
authors.initials: Y
authors.lastname: Hayakawa
authors.forename: L
authors.initials: L
authors.lastname: Van Kaer
authors.forename: H
authors.initials: H
authors.lastname: Matsuda
authors.forename: H
authors.initials: H
authors.lastname: Yagita
authors.forename: K
authors.initials: K
authors.lastname: Okumura
mesh_terms: D019264:Adoptive Transfer; D000410:Alanine Transaminase / Q000097:blood; D000818:Animals; D018949:Antigens, CD1 / Q000235:genetics / Q000276:immunology; D017209:Apoptosis; D001219:Aspartate Aminotransferases / Q000097:blood; D003208:Concanavalin A; D003602:Cytotoxicity, Immunologic; D053222:Fas Ligand Protein; D006520:Hepatitis, Animal / Q000139:chemically induced / Q000276:immunology* / Q000473:pathology; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology*; D008099:Liver / Q000276:immunology* / Q000473:pathology; D017710:Lymphocyte Transfusion; D008297:Male; D008562:Membrane Glycoproteins / Q000172:deficiency / Q000235:genetics / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout
chemical_list: D018949:Antigens, CD1; C505661:FASLG protein, human; D053222:Fas Ligand Protein; C505658:Fasl protein, mouse; D008562:Membrane Glycoproteins; D003208:Concanavalin A; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase