title: Polyclonal anti-idiotypic antibodies exhibit antigenic mimicry of limited type 1 fimbrial proteins of Escherichia coli.
abstract: Polyclonal anti-idiotypic antibodies (anti-Ids)(fim) developed against idiotypes on antibodies (Ab-1s) that specifically bind structural, organelle fimbrial proteins of Escherichia coli were able to modulate immune function in anti-Id(fim)-immunized mice. Proliferation or suppression of splenic lymphoid cell responses by polyclonal anti-Ids in tissue culture appeared to be dose dependent. Anti-Ids were able to induce a dose-dependent T-cell-mediated immunity specific for type 1 fimbrial antigen(s) in immunized animals when assessed in vitro, but they failed to elicit in vivo positive ear-swelling skin reactions. Anti-Ids were unable to induce protective immunity against an in vivo infectious challenge with E. coli in anti-Id-immunized adult animals, but they stimulated a specific, secondary antibody response in anti-Id-challenged mice. Anti-Ids stimulated the development of anti-anti-Ids (Ab-3s) specifically binding a fimbrial antigen(s) and revealed the presence of antibody idiotypes binding E. coli adhesin proteins in the 27- to 29-kilodalton range. Results suggest discrete, but subtle, immunomodulatory effects of the anti-Ids and potential vaccinoid properties capable of stimulating a specific humoral and cellular response in vivo.
authors.affiliation: Department of Microbiology, University of Texas Health Science Center, San Antonio 78284-7758.
authors.forename: R E
authors.initials: RE
authors.lastname: Paque
authors.forename: R
authors.initials: R
authors.lastname: Miller
authors.forename: V
authors.initials: V
authors.lastname: Thomas
mesh_terms: D018830:Adhesins, Escherichia coli; D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology*; D000918:Antibody Specificity; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology*; D001428:Bacterial Vaccines / Q000276:immunology; D004926:Escherichia coli / Q000276:immunology*; D010861:Fimbriae, Bacterial / Q000276:immunology; D006968:Hypersensitivity, Delayed; D007114:Immunization; D051379:Mice; D008807:Mice, Inbred BALB C; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D018830:Adhesins, Escherichia coli; D000888:Antibodies, Anti-Idiotypic; D001425:Bacterial Outer Membrane Proteins; D001428:Bacterial Vaccines