title: Comparison of humoral immune responses and tumor immunity in mice immunized with recombinant SV40 large tumor antigen and a monoclonal anti-idiotype.
abstract: We compared the humoral immune responses induced in BALB/c mice by immunization with recombinant SV40 large tumor antigen (T-ag) with those induced by a monoclonal anti-idiotype (anti-Id), designated 58D, that is specific for SV40 T-ag-induced Id network components. We also challenged immunized mice with a lethal dose of SV40-transformed cells to assess in vivo tumor immunity. Two biweekly immunization with either SV40 T-ag or anti-Id 58D induced humoral responses that recognized both SV40 T-ag and anti-Id 58D. Four biweekly immunizations with SV40 T-ag increased the antigen-specific antibody titers and decreased the response to anti-Id 58D, while four biweekly immunizations of anti-Id 58D increased antibody titers to both itself and SV40 T-ag. Comparison of specific T-ag epitope and idiotope specificities indicated that SV40 T-ag and anti-Id 58D immunization generated responses that recognized a similar epitope on SV40 T-ag and expressed a shared idiotope recognized by anti-Id 58D. SV40 T-ag immunized mice challenged with a lethal dose of SV40-transformed cells were completely protected and no tumors were observed. This is despite the fact that little or no SV40 T-ag-specific cytotoxic T-lymphocyte activity was detectable. In contrast, only 3 of 10 mice immunized with anti-Id 58D were protected from a lethal challenge. These results indicate that, although monoclonal anti-Id immunization can induce responses that recognize similar SV40 T-ag epitopes and express shared idiotopes associated with antibodies to SV40 T-ag, the recombinant antigen itself induces superior in vivo tumor immunity.
authors.affiliation: Department of Virology and Immunology, Southwest Foundation for Biomedical Research, San Antonio, Texas 78228-0147.
authors.forename: M H
authors.initials: MH
authors.lastname: Shearer
authors.forename: R K
authors.initials: RK
authors.lastname: Bright
authors.forename: R C
authors.initials: RC
authors.lastname: Kennedy
mesh_terms: D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000097:blood; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000914:Antibodies, Viral / Q000097:blood; D000952:Antigens, Polyomavirus Transforming / Q000276:immunology*; D000939:Epitopes; D005260:Female; D007114:Immunization; D007130:Immunoglobulin Idiotypes / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D009374:Neoplasms, Experimental / Q000276:immunology*; D011994:Recombinant Proteins / Q000276:immunology; D013539:Simian virus 40 / Q000276:immunology*; D014614:Vaccines, Synthetic / Q000276:immunology*
chemical_list: D000888:Antibodies, Anti-Idiotypic; D000911:Antibodies, Monoclonal; D000914:Antibodies, Viral; D000952:Antigens, Polyomavirus Transforming; D000939:Epitopes; D007130:Immunoglobulin Idiotypes; D011994:Recombinant Proteins; D014614:Vaccines, Synthetic