Recombinant BCG coexpressing Ag85B, ESAT-6 and mouse-IFN-gamma confers effective protection against Mycobacterium tuberculosis in C57BL/6 mice

FEMS Immunol Med Microbiol. 2007 Dec;51(3):480-7. doi: 10.1111/j.1574-695X.2007.00322.x. Epub 2007 Oct 4.

Abstract

In this study, the protective efficacy of a novel recombinant bacille Calmette Géurin (BCG) strain (rBCG-AEI) expressing fusion protein the antigen 85B (Ag85B)- the 6-kDa early secreted antigen target (ESAT-6)-IFN-gamma against Mycobacterium tuberculosis H37Rv in mice was evaluated. The immunogenicity study showed that rBCG-AEI could induce higher specific antibody titers and significantly increase cellular immune response than BCG, or rBCG-A strain (expressing Ag85B), or rBCG-AE strain (expressing fusion protein Ag85B-ESAT-6). The protective experiment demonstrated that rBCG-AEI could confer similar or even better protective efficacy against M. tuberculosis infection compared with others in organ bacterial loads, lung histopathology and net weight gain or loss. The results suggested that rBCG-AEI is a potential candidate for further study.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acyltransferases / genetics
  • Acyltransferases / immunology*
  • Animals
  • Antibodies, Bacterial / blood
  • Antigens, Bacterial / biosynthesis
  • Antigens, Bacterial / genetics
  • Antigens, Bacterial / immunology*
  • Bacterial Proteins / biosynthesis
  • Bacterial Proteins / genetics
  • Bacterial Proteins / immunology*
  • Bacterial Vaccines / genetics
  • Bacterial Vaccines / immunology*
  • Body Weight
  • Colony Count, Microbial
  • Female
  • Interferon-gamma / biosynthesis
  • Interferon-gamma / genetics
  • Interferon-gamma / immunology*
  • Lung / microbiology
  • Lung / pathology
  • Mice
  • Mice, Inbred C57BL
  • Mycobacterium bovis / genetics
  • Mycobacterium bovis / immunology*
  • Mycobacterium tuberculosis / immunology
  • Recombinant Fusion Proteins / biosynthesis
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / immunology
  • Spleen / microbiology
  • T-Lymphocytes / immunology
  • Tuberculosis / prevention & control*
  • Tuberculosis Vaccines / immunology*
  • Vaccines, Synthetic / genetics
  • Vaccines, Synthetic / immunology

Substances

  • Antibodies, Bacterial
  • Antigens, Bacterial
  • Bacterial Proteins
  • Bacterial Vaccines
  • ESAT-6 protein, Mycobacterium tuberculosis
  • Recombinant Fusion Proteins
  • Tuberculosis Vaccines
  • Vaccines, Synthetic
  • Interferon-gamma
  • Acyltransferases
  • antigen 85B, Mycobacterium tuberculosis