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Does Yersinia induce autoimmunity?

P Toivanen1, A Toivanen

  • 1Department of Medical Microbiology, Turku University, Finland.

International Archives of Allergy and Immunology
|January 1, 1994
PubMed
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Yersinia enterocolitica O:3 shares structural similarities with the human thyrotropin receptor, but its role in thyroid autoimmunity is complex. Further research is needed to understand Yersinia

Area of Science:

  • Immunology
  • Microbiology
  • Endocrinology

Background:

  • Yersinia enterocolitica O:3 exhibits serological cross-reactivity with the human thyrotropin receptor, suggesting molecular mimicry.
  • The precise molecular basis for this cross-reactivity and its implications for thyroid autoimmunity remain unclear.
  • Yersinia's role in spondyloarthropathies, particularly reactive arthritis, is debated, with potential contributions from microbial components or autoimmunity.

Purpose of the Study:

  • To explore the relationship between Yersinia enterocolitica O:3 and human autoimmune diseases.
  • To investigate the potential role of Yersinia in thyroid autoimmunity and spondyloarthropathies.
  • To evaluate the significance of cytotoxic T-cell responses in Yersinia-associated autoimmunity.

Main Methods:

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  • Serological cross-reactivity assays were used to identify structural similarities between Yersinia enterocolitica O:3 and the human thyrotropin receptor.
  • Analysis of existing literature and clinical data regarding Yersinia infections and autoimmune conditions.
  • Characterization of cytotoxic T-cell clones from patients with Yersinia-triggered reactive arthritis.

Main Results:

  • Yersinia enterocolitica O:3 and the human thyrotropin receptor share structural similarities, but Yersinia is not a major inducer of thyroid autoimmunity.
  • Yersinia may contribute to thyroid autoimmunity in genetically susceptible individuals through interactions with the intestinal flora.
  • Evidence for molecular mimicry between Yersinia and HLA B27 in spondyloarthropathies is lacking, though specific T-cell responses have been observed.

Conclusions:

  • While Yersinia enterocolitica O:3 shares structural similarities with the human thyrotropin receptor, its direct role in inducing thyroid autoimmunity is limited.
  • Yersinia infections may act as a trigger for autoimmunity in susceptible individuals, particularly in the context of other autoimmune predispositions.
  • The precise mechanisms underlying Yersinia's involvement in spondyloarthropathies require further investigation, focusing on the characterization of involved microbial and host peptides.