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Escherichia coli -Based Complementation Assay to Study the Chaperone Function of Heat Shock Protein 70
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Exposure to mycobacteria primes the immune system for evolutionarily diverse heat shock proteins

Khaleda Rahman Qazi1, Mousumi Rahman Qazi, Esther Julián

  • 1Department of Immunology, Wenner-Gren Institute, Stockholm University, SE-106 91 Stockholm, Sweden.

Infection and Immunity
|October 22, 2005
PubMed

Insights

Exposure to certain microorganisms like BCG and M. vaccae can prime the immune system to respond to heat shock proteins (HSPs). This priming effect supports the use of HSPs as potential vaccine adjuvants.

Area of Science:

  • Immunology
  • Microbiology
  • Vaccinology

Background:

  • Microbial stress conditions, like infection, upregulate heat shock protein (HSP) synthesis.
  • Homology within HSP families suggests potential for cross-priming of immune responses.

Purpose of the Study:

  • To investigate if prior exposure to microorganisms can prime the immune system for diverse HSPs.
  • To evaluate the potential of HSPs as vaccine adjuvants.

Main Methods:

  • Mice were primed with Mycobacterium bovis BCG, Mycobacterium vaccae, or Chlamydia pneumoniae.
  • Primed mice were subsequently exposed to various HSPs.
  • Immunoglobulin G (IgG) responses, IgG1/IgG2a profiles, and gamma interferon production were analyzed.

Main Results:

  • BCG and M. vaccae, but not C. pneumoniae, primed the immune system for secondary IgG responses to most tested HSPs.
  • A mixed immune response profile (IgG1/IgG2a and interferon-gamma) was observed.
  • Sera from M. vaccae and HSP70-treated mice showed cross-reactivity without kidney antibody complex formation.

Conclusions:

  • Microbial priming can induce specific immune responses to evolutionarily diverse heat shock proteins.
  • Findings support the use of HSPs as effective vaccine adjuvants, potentially with reduced risk of autoimmunity.

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