title: Giardia muris trophozoite antigenic targets for mouse intestinal IgA antibody.
abstract: The aim of this work was to characterize Giardia muris trophozoite proteins that are targets for intestinal anti-trophozoite IgA in G. muris-infected mice. Intestinal secretions were obtained from immunocompetent BALB/c mice that had been infected with G. muris cysts 4-5 weeks previously and from control uninfected BALB/c mice. Flow cytometry of G. muris trophozoites that had been incubated with intestinal secretions and with fluorescein isothiocyanate-conjugated anti-mouse IgA showed that anti-trophozoite IgA was present in intestinal secretions obtained from infected BALB/c mice. By immunoblotting on G. muris trophozoite proteins separated by one-dimensional gel electrophoresis, this IgA recognized at least one trophozoite protein of molecular mass of approximately 80 kDa. The 80-kDa G. muris protein(s) has a molecular mass similar to that described for cysteine-rich surface proteins of the human parasite Giardia lamblia.
authors.affiliation: Cell Biology Section, Department of Veterans Affairs Medical Center, San Francisco, CA 94121.
authors.forename: M F
authors.initials: MF
authors.lastname: Heyworth
authors.forename: J A
authors.initials: JA
authors.lastname: Vergara
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000276:immunology*; D000953:Antigens, Protozoan / Q000276:immunology*; D015153:Blotting, Western; D005260:Female; D005872:Giardia / Q000276:immunology*; D005873:Giardiasis / Q000276:immunology*; D007070:Immunoglobulin A / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D015800:Protozoan Proteins / Q000276:immunology
chemical_list: D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; D007070:Immunoglobulin A; D015800:Protozoan Proteins