title: Breaking tolerance leads to autoantibody production but not autoimmune liver disease in hepatitis B virus envelope transgenic mice.
abstract: Hepatitis B virus (HBV) transgenic mice containing the HBV envelope open reading frame under the transcriptional control of the mouse albumin promoter express hepatitis B surface Ag (HBsAg) in all of their hepatocytes and secrete HBsAg (10 to 40 ng/ml) into the circulation. Because these transgenic mice show no signs of spontaneous liver cell injury or autoimmunity toward the viral (self-) Ag, we asked whether the state of self-tolerance could be reversed by the induction of an acute necroinflammatory liver disease or by immunization with HBV envelope proteins, with the aim of creating a transgenic model for chronic, immune-mediated hepatitis. Our studies indicate that repetitive administration of bacterial LPS, IFN-gamma, or HBsAg-specific CTL, all of which were previously shown to cause liver cell injury and inflammation, does not break tolerance at the T or B cell level, suggesting that the intrahepatic lymphomononuclear cell infiltrate induced by these agents consists of HBsAg-nonspecific cells. The adoptive transfer of HBsAg-primed nontransgenic CD4+ T cells into transgenic mice did not induce anti-HBs autoantibody production by transgenic B cells, even though transgenic B cells were fully responsive to immunization with HBsAg when appropriate T cell help was provided in a nontransgenic environment. Immunization of transgenic mice with purified HBsAg in CFA and repetitive infection with rHBV envelope vaccinia virus led to production of T cell-dependent anti-HBs autoantibodies that cleared HBsAg from the serum, but not to activation of HBsAg-specific CTL. We conclude that HBV envelope transgenic mice are largely tolerant to the transgene product at the T cell but not at the B cell level, and that the activation of an anti-HBs response was not sufficient to induce an autoimmune liver disease in this HBV envelope transgenic mouse model.
authors.affiliation: Department of Molecular and Experimental Medicine, Scripps Research Institute, La Jolla, CA 92037.
authors.forename: S
authors.initials: S
authors.lastname: Wirth
authors.forename: L G
authors.initials: LG
authors.lastname: Guidotti
authors.forename: K
authors.initials: K
authors.lastname: Ando
authors.forename: H J
authors.initials: HJ
authors.lastname: Schlicht
authors.forename: F V
authors.initials: FV
authors.lastname: Chisari
mesh_terms: D000818:Animals; D001323:Autoantibodies / Q000096:biosynthesis*; D001327:Autoimmune Diseases / Q000209:etiology; D001402:B-Lymphocytes / Q000276:immunology; D005260:Female; D005814:Genes, Viral; D006510:Hepatitis B Antibodies / Q000096:biosynthesis; D006514:Hepatitis B Surface Antigens / Q000235:genetics / Q000276:immunology; D006515:Hepatitis B virus / Q000235:genetics / Q000276:immunology*; D007114:Immunization; D008099:Liver / Q000276:immunology; D008107:Liver Diseases / Q000209:etiology; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D016366:Open Reading Frames; D017634:Self Tolerance; D013601:T-Lymphocytes / Q000276:immunology; D014759:Viral Envelope Proteins / Q000235:genetics / Q000276:immunology
chemical_list: D001323:Autoantibodies; D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D014759:Viral Envelope Proteins