Please use this identifier to cite or link to this item:
Type: Artigo de periódico
Title: Oral immunization with attenuated Salmonella vaccine expressing Escherichia coli O157:H7 intimin gamma triggers both systemic and mucosal humoral immunity in mice
Author: Oliveira, Aline Ferreira
Cardoso, Silvia Almeida
dos Reis Almeida, Fausto Bruno
de Oliveira, Leandro Licursi
Pitondo-Silva, Andre
Soares, Sandro Gomes
Hanna, Ebert Seixas
Abstract: Human infections with EHEC such as O157:H7 have been a great concern for worldwide food-industry surveillance. This pathogen is commonly associated with bloody diarrhea that can evolve to the life-threatening hemolytic uremic syndrome. Animals are the natural reservoir where this pathogen remains asymptomatically, in steps of ingestion and colonization of the bowel. The bacterium is shed in the feces, contaminating the surroundings, including water and food that are directed for human consumption. A major player in this colonization process is intimin, an outer membrane adhesion molecule encoded by the E. coli attachment and effacement (eae) gene that has been shown to be essential for intimate bacterial attachment to eukaryotic host cells. In an attempt to reduce the colonization of animal reservoirs with EHEC O157:H7, we designed a vaccine model to induce an immune response against intimin gamma. The model is based on its recombinant expression in attenuated Salmonella, used as a suitable vaccine vector because of its recognized ability to deliver recombinant antigens and to elicit all forms of immunity: mucosal, systemic, and humoral responses. To test this model, mice were orally immunized with a S. enterica serovar Typhimurium strain carrying the pYA3137eaeA vector, and challenged with E. coli O157:H7. Here we show that immunization induced the production of high levels of specific IgG and IgA antibodies and promoted reduction in the fecal shedding of EHEC after challenge. The live recombinant vaccine reported herein may contribute to the efforts of reducing animal intestinal mucosa colonization.
Subject: Escherichia coli
Salmonella enterica Typhimurium
Editor: Wiley-Blackwell
Citation: Microbiology and Immunology. Wiley-Blackwell, v.56, n.8, p.513-522, 2012
Rights: fechado
Identifier DOI: 10.1111/j.1348-0421.2012.00477.x
Date Issue: 2012
Appears in Collections:IB - Artigos e Outros Documentos

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.