title: Heat killed multi-serotype Shigella immunogens induced humoral immunity and protection against heterologous challenge in rabbit model.
abstract: Recently we have shown the homologous protective efficacy of heat killed multi-serotype Shigella (HKMS) immunogens in a guinea pig colitis model. In our present study, we have advanced our research by immunizing rabbits with a reduced number of oral doses and evaluating the host's adaptive immune responses. The duration of immunogenicity and subsequently protective efficacy was determined against wild type heterologous Shigella strains in a rabbit luminal model. After three successive oral immunizations with HKMS immunogens, serum and lymphocyte supernatant antibody titer against the heterologous shigellae were reciprocally increased and remained at an elevated level up to 180 days. Serogroup and serotype specific O-antigen of lipopolysaccharide and immunogenic proteins of heterologous challenge strains were detected by immunoblot assay. Up-regulation of IL-12p35, IFN-γ and IL-10 mRNA expression was detected in immunized rabbit peripheral blood mononuclear cells (PBMC) after stimulation with HKMS in vitro. HKMS-specific plasma cell response was confirmed by production of a relatively higher level of HKMS-specific IgG in immunized PBMC supernatant compared to control group. Furthermore, the immunized groups of rabbits exhibited complete protection against wild type heterologous shigellae challenge. Thus HKMS immunogens induced humoral and Th1-mediated adaptive immunity and provided complete protection in a rabbit model. These immunogens could be a broad spectrum non-living vaccine candidate for human use in the near future.
authors.affiliation: Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India.
authors.forename: Dhrubajyoti
authors.initials: D
authors.lastname: Nag
authors.affiliation: Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India.
authors.forename: Ritam
authors.initials: R
authors.lastname: Sinha
authors.affiliation: Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India.
authors.forename: Soma
authors.initials: S
authors.lastname: Mitra
authors.affiliation: Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India.
authors.forename: Soumik
authors.initials: S
authors.lastname: Barman
authors.affiliation: Collaborative Research Centre of Okayama University for Infectious Diseases, National Institute of Cholera and Enteric Diseases, Kolkata, India.
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Takeda
authors.affiliation: Collaborative Research Centre of Okayama University for Infectious Diseases, National Institute of Cholera and Enteric Diseases, Kolkata, India.
authors.forename: Sumio
authors.initials: S
authors.lastname: Shinoda
authors.affiliation: Division of Pathophysiology, National Institute of Cholera and Enteric Diseases, Kolkata, India.
authors.forename: M K
authors.initials: MK
authors.lastname: Chakrabarti
authors.affiliation: Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India. Electronic address: hemantakoley@hotmail.com.
authors.forename: Hemanta
authors.initials: H
authors.lastname: Koley
mesh_terms: D056704:Adaptive Immunity; D000284:Administration, Oral; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood / Q000276:immunology; D000917:Antibody Formation; D000942:Antigens, Bacterial / Q000008:administration & dosage / Q000276:immunology*; D004195:Disease Models, Animal; D004405:Dysentery, Bacillary / Q000276:immunology* / Q000517:prevention & control*; D005260:Female; D007111:Immunity, Cellular; D056724:Immunity, Humoral; D007114:Immunization; D007071:Immunoglobulin A, Secretory / Q000097:blood / Q000276:immunology; D007132:Immunoglobulin Isotypes / Q000097:blood / Q000276:immunology; D008297:Male; D010950:Plasma Cells / Q000276:immunology / Q000378:metabolism; D011817:Rabbits; D065288:Serogroup; D012760:Shigella / Q000145:classification / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D007071:Immunoglobulin A, Secretory; D007132:Immunoglobulin Isotypes
keywords: Adaptive immunity; Heat killed multi serotype; Humoral immunity; Rabbit model; Shigella