title: Immunization against hepatitis B virus by mucosal administration of antigen-antibody complexes.
abstract: Antigen-antibody complexes have been shown to enhance immune responses against several antigens given by parenteral immunization. Herein, we have evaluated the potential of administering such immunostimulatory complexes by a mucosal route. Hepatitis B surface antigen (HBsAg) complexed with antibodies against HBsAg (anti-HBs) (HBsAg/Ab) was administered to BALB/c mice by intranasal inhalation. HBsAg by itself did not induce immune responses, whereas with HBsAg/Ab complexes, both systemic and mucosal immune responses were observed and these could be modulated by adjuvants. With HBsAg/Ab (1 or 10 microg), anti-HBs antibodies induced were predominantly of the IgG1 isotype (Th2-like). In contrast, anti-HBs induced by HBsAg/Ab plus cholera toxin (CT) or oligodeoxynucleotides (ODN) containing immunostimulatory CpG motifs (CpG) (1 microg each) were predominantly IgG2a (Th1-like). Results from this study indicate that HBsAg/Ab complexes can induce strong humoral immune responses when delivered by a noninvasive route, whether used alone or in combination with other mucosal adjuvants.
authors: Loeb Health Research Institute, Ottawa, Canada.
authors: M J
authors: MJ
authors: McCluskie
authors: Y M
authors: YM
authors: Wen
authors: Q
authors: Q
authors: Di
authors: H L
authors: HL
authors: Davis
mesh_terms: D000818:Animals; D000936:Antigen-Antibody Complex / Q000276:immunology*; D004333:Drug Administration Routes; D005260:Female; D006510:Hepatitis B Antibodies / Q000276:immunology*; D006514:Hepatitis B Surface Antigens / Q000276:immunology*; D017325:Hepatitis B Vaccines / Q000276:immunology*; D006515:Hepatitis B virus / Q000276:immunology*; D007116:Immunization, Passive / Q000379:methods*; D051379:Mice; D008807:Mice, Inbred BALB C; D009092:Mucous Membrane
chemical_list: D000936:Antigen-Antibody Complex; D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D017325:Hepatitis B Vaccines