Protective and cross-protective mucosal immunization of mice by influenza virus type A with bacterial adjuvant.
Mucosal immunization by inactivated viruses often fails to evoke a sufficient immune response. Intensive efforts have been made to enhance the response by suitable adjuvants. We used the G+ nonpathogenic delipidated bacterium Bacillus firmus with pronounced immunostimulatory properties as an adjuvant for immunizing mice with inactivated influenza virus type A. BALB/c mice were immunized intratracheally with inactivated influenza A H1N1 and H3N2 viruses. The production of antibodies in sera and secretions was determined by the ELISA. The local situation in the lungs was assessed histologically and by testing the cytokine expression. The protective and cross-protective effect against infection was tested in in vivo experiments after infection with influenza virus A H1N1. B. firmus as adjuvant increased both systemic and mucosal antibody responses, improved protection against homologous virus and induced cross-protection against virus H1N1 after immunization with virus H3N2.
Zanvit
Peter
P
Charles University, First Faculty of Medicine, Institute of Immunology and Microbiology, Studnickova 7, 128 00 Prague 2, Czech Republic. pzanvit@yahoo.com
Havlícková
Martina
M
Tácner
Jaroslav
J
Novotná
Olga
O
Jirkovská
Marie
M
Cechová
Dana
D
Julák
Jaroslav
J
Sterzl
Ivan
I
Prokesová
Ludmila
L
D000276:Adjuvants, Immunologic; D000818:Animals; D000914:Antibodies, Viral / Q000097:blood / Q000276:immunology*; D001407:Bacillus / Q000276:immunology*; D003429:Cross Reactions; D016207:Cytokines / Q000096:biosynthesis / Q000276:immunology; D005260:Female; D006801:Humans; D018928:Immunity, Mucosal; D007114:Immunization; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology*; D053122:Influenza A Virus, H3N2 Subtype / Q000276:immunology*; D007252:Influenza Vaccines / Q000276:immunology*; D007251:Influenza, Human / Q000276:immunology* / Q000401:mortality / Q000517:prevention & control / Q000821:virology; D008168:Lung / Q000276:immunology / Q000473:pathology; D051379:Mice; D008807:Mice, Inbred BALB C; D009976:Orthomyxoviridae Infections / Q000276:immunology / Q000401:mortality / Q000517:prevention & control
D000276:Adjuvants, Immunologic; D000914:Antibodies, Viral; D016207:Cytokines; D007252:Influenza Vaccines