title: Maintenance of antigen-specific immunological memory through variable regions of heavy and light chains of anti-idiotypic antibody.
abstract: Immunological memory is characterized by a quick and enhanced immune response after re-exposure to the same antigen. To explain the mechanism involved in generation and maintenance of immunological memory, we had earlier proposed a hypothesis involving the relay of memory by idiotypic and anti-idiotypic B cells. The peptidomimic present in the hypervariable region of anti-idiotypic antibody was hypothesized to carry forward immunological memory. In the present work, we provide evidence supporting a role for the anti-idiotypic antibody in eliciting antigen-specific B-cell and T-cell responses. Employing the idiotypic monoclonal antibody (Ab(1)) specific for haemagglutinin (H) protein of rinderpest virus, Ab(2beta) was generated, which possesses an internal image of the H protein in the region between amino acids 527 and 556. We demonstrate that antigen-specific memory is perpetuated by immunization with Ab(2), as shown by maintenance of antigen-specific T-cell responses upon restimulation in vitro of Ab(2) immune splenocytes by antigen-presenting cells expressing H protein or pulsed with H-protein-derived peptides. We have also shown that boosting with antigen-specific anti-idiotypic B cells generates a memory response in antigen-primed mice. Evidence has been provided for the existence of an antigen-specific B-cell idiotypic network in the body that supports the perpetuation of immunological memory as proposed in the relay hypothesis.
authors.affiliation: Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore, Karnataka, India.
authors.forename: J
authors.initials: J
authors.lastname: Vani
authors.forename: R
authors.initials: R
authors.lastname: Nayak
authors.forename: M S
authors.initials: MS
authors.lastname: Shaila
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology; D001667:Binding, Competitive; D002460:Cell Line; D049109:Cell Proliferation; D018984:Epitopes, T-Lymphocyte / Q000276:immunology; D005260:Female; D006023:Glycoproteins / Q000378:metabolism; D006389:Hemagglutinins, Viral / Q000378:metabolism; D007114:Immunization; D007143:Immunoglobulin Heavy Chains / Q000276:immunology*; D007147:Immunoglobulin Light Chains / Q000276:immunology*; D007135:Immunoglobulin Variable Region / Q000276:immunology*; D007156:Immunologic Memory / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D051381:Rats; D017207:Rats, Sprague-Dawley; D016415:Sequence Alignment; D013045:Species Specificity; D014764:Viral Proteins / Q000378:metabolism
chemical_list: D000888:Antibodies, Anti-Idiotypic; D018984:Epitopes, T-Lymphocyte; D006023:Glycoproteins; D006389:Hemagglutinins, Viral; D007143:Immunoglobulin Heavy Chains; D007147:Immunoglobulin Light Chains; D007135:Immunoglobulin Variable Region; D014764:Viral Proteins; C079749:hemagglutinin protein, Rinderpest virus