title: New T cell epitopes identified from an anti-idiotypic antibody mimicking ovarian cancer associated antigen.
abstract: Anti-idiotype (Id) antibodies can be used to induce specific cellular immune responses against tumor antigens, but the mechanism of antigenicity is not always clear. We previously reported an anti-Id antibody, 6B11, which mimics human ovarian cancer associated antigen OC166-9. To explore the molecular basis of cellular immune response induced by 6B11, a panel of peptides derived from complementarity determining region (CDR) of 6B11 were synthesized. After a series of immunologic experiments, we found that the light chain CDR3 peptide and heavy chain CDR3 peptide were the MHC class I and class II epitopes of 6B11, respectively. The combination of MHC class I and class II epitopes is more effective than 6B11 in inducing specific cellular immune response against ovarian cancer. Our study provided the structural basis of antigenicity of 6B11. The identification of antigen-specific T cell eptitopes in 6B11 should facilitate the design of epitope-based vaccine against human ovarian cancer.
authors.affiliation: Gynecologic Oncology Center, Peking University People's Hospital, 11 Xi Zhi Men South Street, Xi Cheng District, Beijing, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Heng
authors.initials: H
authors.lastname: Cui
authors.forename: Fan-Qiang
authors.initials: FQ
authors.lastname: Meng
authors.forename: Xiao-Hong
authors.initials: XH
authors.lastname: Chang
authors.forename: Guo
authors.initials: G
authors.lastname: Zhang
authors.forename: Bei
authors.initials: B
authors.lastname: Liu
authors.forename: Zi-Hai
authors.initials: ZH
authors.lastname: Li
mesh_terms: D000888:Antibodies, Anti-Idiotypic / Q000737:chemistry / Q000276:immunology*; D000912:Antibodies, Neoplasm / Q000276:immunology*; D000951:Antigens, Neoplasm / Q000737:chemistry / Q000276:immunology*; D022801:Complementarity Determining Regions / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D018984:Epitopes, T-Lymphocyte / Q000737:chemistry / Q000276:immunology*; D005260:Female; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D006801:Humans; D018716:Molecular Mimicry / Q000276:immunology; D010051:Ovarian Neoplasms / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology
chemical_list: D000888:Antibodies, Anti-Idiotypic; D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D022801:Complementarity Determining Regions; D018984:Epitopes, T-Lymphocyte; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II