Combined vaccine regimen based on parenteral priming with a DNA vaccine and administration of an oral booster consisting of a recombinant Salmonella enterica serovar typhimurium vaccine strain for immunization against infection with human-derived enterotoxigenic Escherichia coli strains

Combined vaccine regimen based on parenteral priming with a DNA vaccine and administration of an oral booster consisting of a recombinant Salmonella enterica serovar typhimurium vaccine strain for immunization against infection with human-derived enterotoxigenic Escherichia coli strains

Autor Lasaro, Marcio O. Google Scholar
Luiz, Wilson B. Google Scholar
Sbrogio-Almeida, Maria E. Google Scholar
Nishimura, Lucilia S. Autor UNIFESP Google Scholar
Guth, Beatriz EC Autor UNIFESP Google Scholar
Ferreira, Luis CS Google Scholar
Instituição Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Butantan Inst
Resumo Repeated evidence has demonstrated that combined primer-booster immunization regimens can improve both secreted and humoral immune responses to antigens derived from viral, bacterial, and parasitic pathogens. for the present work, we evaluated the synergic serum immunoglobulin G (IgG) and fecal IgA antibody responses elicited in BALB/c mice who were intramuscularly primed with a DNA vaccine, pRECFA, followed by oral boosting with an attenuated Salmonella enterica serovar Typhimurium vaccine (HG3) strain, with both vaccines encoding the structural subunit (CfaB) of the CFA/I fimbriae produced by human-derived enterotoxigenic Escherichia coli (ETEC) strains. the immunological properties of the vaccine regimen were evaluated according to the order of the administered vaccines, the nature of the oral antigen carrier, the age of the vaccinated animals, the interval between the priming and boosting doses, and the amount of injected DNA. the production of gamma interferon and the IgG2a subclass in serum indicated that mice immunized with the primer-booster regimen developed prevailing type 1 T-cell-dependent immune responses. the synergic effect of the vaccine regimen on the induced antibody responses was also revealed by its ability to block the adhesive properties of CFA/I fimbriae expressed by live bacteria, as shown by the inhibition of Caco-2 cell and human erythrocyte binding. Moreover, DBA2 newborn mice were protected from lethal challenges with a CFA/I+ ETEC strain after the incubation of live bacteria with serum samples harvested from mice who were subjected to the primer-booster regimen. We propose, therefore, that the DNA primer-Salmonella booster regimen represents an alternative for the development of vaccines requiring both mucosal and systemic antibody responses for immunological protection.
Idioma Inglês
Data de publicação 2004-11-01
Publicado em Infection and Immunity. Washington: Amer Soc Microbiology, v. 72, n. 11, p. 6480-6491, 2004.
ISSN 0019-9567 (Sherpa/Romeo, fator de impacto)
Publicador Amer Soc Microbiology
Extensão 6480-6491
Fonte http://dx.doi.org/10.1128/IAI.72.11.6480-6491.2004
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000224664300037
Endereço permanente http://repositorio.unifesp.br/handle/11600/27993

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