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Role of Yersinia pseudotuberculosis outer proteins (Yops) in murine humoral immune response

J M L Maia1, L G S Monnazzi, B M M Medeiros

  • 1Department of Biological Sciences, School of Pharmaceutical Sciences, São Paulo State University, SP, Brazil.

Folia Microbiologica
|August 4, 2009
PubMed

Insights

Yersinia pseudotuberculosis infection suppresses B cell immunoglobulin production, particularly certain isotypes. Key virulence factors YopH, YopJ, and YpkA are implicated in this immune suppression.

Area of Science:

  • Immunology
  • Microbiology
  • Bacterial Pathogenesis

Background:

  • Yersinia pseudotuberculosis (Y. pseudotuberculosis) is a bacterial pathogen that can cause various infections.
  • Understanding the host immune response to Y. pseudotuberculosis infection is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the impact of Y. pseudotuberculosis wild-type (WT) infection on B lymphocyte activation and immunoglobulin (Ig) production in mice.
  • To identify the specific virulence factors responsible for immune suppression.

Main Methods:

  • Infection of mice with the WT strain of Y. pseudotuberculosis.
  • Analysis of B lymphocyte activation and immunoglobulin production (IgG, IgM).
  • Assessment of autoantibody production.

Main Results:

  • WT Y. pseudotuberculosis infection did not induce polyclonal B lymphocyte activation.
  • Suppression of certain immunoglobulin isotypes was observed, primarily mediated by YopH, YopJ, and YpkA.
  • Progressive increase in serum-specific IgG and transient IgM production occurred post-infection.
  • Autoantibodies against phosphorylcholine, myelin, thyroglobulin, and cardiolipin were detected.

Conclusions:

  • Y. pseudotuberculosis infection leads to suppression of immunoglobulin production by splenic B cells.
  • The Yersinia outer proteins (Yops) YopH, YopJ, and YpkA are critical in mediating this immunosuppression.

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