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Evaluation of systemic and mucosal immune responses in mice administered with recombinant Salmonella Typhimurium expressing IutA protein

  • Oh, In-Gyeong (College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University) ;
  • Choi, Minsu (College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University) ;
  • Lee, John Hwa (College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University)
  • Received : 2013.01.04
  • Accepted : 2013.07.16
  • Published : 2013.09.30

Abstract

Avian pathogenic Escherichia coli (APEC) are known to cause extraintestinal disease in poultry, leading to substantial losses in the industry. IutA, iron-regulated aerobactin receptor is firmly associated with APEC. To assess the potential of IutA to induce protective immune responses, attenuated Salmonella Typhimurium strain expressing IutA was constructed and administered orally to BALB/c mice. The IutA-specific immune responses were measured with sera, vaginal and fecal samples by an enzyme-linked immunosorbent assay. We found that the Salmonella-IutA vaccine induced significantly higher immune responses as compared to the control inoculated with the attenuated S. Typhimurium containing the plasmid only. The IutA-specific immune responses were increased by second immunization at third week after initial immunization, whereas triple immunization induced lower immune responses than those induced by the double immunization. The Salmonella-IutA vaccine induced a nature of immunity biased to the Th1-type, as judged by the ratio of IutA-specific IgG isotypes (IgG2a/IgG1). Overall, these results suggest that the Salmonella-IutA vaccine appear to be suitable candidate for a vaccine against APEC.

Acknowledgement

Supported by : National Research Foundation (NRF)

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