title: Immunogenicity and protective role of an IgA reactive 31-kDa antigen of Vibrio cholerae O139.
abstract: Immunoglobulin A (IgA) is important in protective immunity against infection by Vibrio cholerae. In this study, the immune response to and protective role of a 31-kDa antigen of V. cholerae O139, reacting with IgA antibodies present in the sera of cholera patients and common to V. cholerae strains O139 and O1 was evaluated in BALB/c mice. From the various antigens of V. cholerae O139 and V. cholerae O1 which reacted with IgA antibodies in sera of a cholera patient, a 31-kDa common antigen was selected and purified by DEAE-Sepharose CL 6B column chromatography. Oral administration of live V. cholerae O139 in BALB/c mice elicited an IgA response to the 31-kDa antigen in serum and intestinal fluid, and a proliferation of the splenic lymphocytes on stimulation with the same antigen. The cytokine profile of these splenic lymphocytes revealed a shift from a mixed Th1 and Th2 response--interleukin-10 (IL-10) and interferon-gamma--in the first week after infection to a Th2 type of response--IL-10--in the third week. In passive protection studies, hyperimmune serum to the 31-kDa antigen was able to protect infant mice against challenge with O139 and O1 strains. These results demonstrate the ability of the 31-kDa antigen of V. cholerae O139 to induce humoral and cellular immune responses in mice, and its immunoprotective nature.
authors.forename: Subodh
authors.initials: S
authors.lastname: Kumar
authors.forename: Pallab
authors.initials: P
authors.lastname: Ray
authors.forename: Harminder
authors.initials: H
authors.lastname: Singh
authors.affiliation: Department of Medical Microbiology and *Department of Experimental Medicine & Biotechnology, Postgraduate Institute of Medical Education and Research, Chandigarh - 160012, India.
authors.forename: Nirmal Kumar
authors.initials: NK
authors.lastname: Ganguly
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D000907:Antibodies, Bacterial / Q000096:biosynthesis / Q000097:blood* / Q000276:immunology; D000942:Antigens, Bacterial / Q000032:analysis / Q000276:immunology* / Q000302:isolation & purification; D002771:Cholera / Q000097:blood / Q000276:immunology*; D002848:Chromatography, DEAE-Cellulose; D016207:Cytokines / Q000096:biosynthesis; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D007111:Immunity, Cellular; D015151:Immunoblotting; D007070:Immunoglobulin A / Q000096:biosynthesis / Q000097:blood* / Q000276:immunology; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D013154:Spleen / Q000166:cytology / Q000276:immunology; D014734:Vibrio cholerae / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D016207:Cytokines; D007070:Immunoglobulin A