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Polyclonal B-cell activation by bacteria that induce nonsuppurative sequelae.

W L Gross1

  • 1I. Medizinische Universitäts-Klinik, Kiel, Federal Republic of Germany.

Rheumatology International
|January 1, 1989
PubMed
Summary
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Certain bacteria like Klebsiella pneumoniae and Yersinia enterocolitica can activate B cells, leading to antibody production without T cells. This process may contribute to autoimmune responses and disease.

Area of Science:

  • Immunology
  • Microbiology
  • Autoimmunity

Background:

  • Polyclonal B cell activation (PBA) is crucial for immune responses but can also lead to autoimmunity.
  • Certain bacterial species, including Klebsiella pneumoniae (klebs) and Yersinia enterocolitica (yers), are implicated in autoimmune diseases.

Purpose of the Study:

  • To investigate the mechanisms of polyclonal B cell activation induced by Klebsiella pneumoniae and Yersinia enterocolitica.
  • To determine the role of bacterial components and host immune cells in this activation process.

Main Methods:

  • Human peripheral blood B cells were stimulated with heat-inactivated bacteria and their cell wall components.
  • Immunoglobulin secretion, proliferation (3H-thymidine uptake), and cell surface marker expression (CD4+, CD8+, monocytes) were analyzed.

Related Experiment Videos

  • The effects of interleukin-2 and B cell growth factor (BCGF) were assessed.

    • Main Results:

    • Both heat-inactivated bacteria and their cell wall structures induced B cell differentiation into immunoglobulin-secreting cells without prior proliferation or T cell involvement.
    • Klebsiella pneumoniae-activated B cells primarily secreted IgM and IgG2.
    • CD4+ cells and monocytes regulated the PBA process, while CD8+ cells did not.
    • Interleukin-2 enhanced B cell proliferation and differentiation, whereas BCGF did not significantly increase proliferation.
    • Anti-polynucleotide autoantibodies and the 16/6 idiotype were detected in Klebsiella pneumoniae-activated cultures.

    Conclusions:

    • Klebsiella pneumoniae and Yersinia enterocolitica can directly activate B cells, bypassing T cell help, leading to antibody production.
    • Bacterial components can trigger polyclonal B cell activation and autoantibody production, potentially contributing to the pathogenesis of diseases with nonsuppurative sequelae.
    • The findings highlight bacterial mechanisms for overcoming host immune tolerance, suggesting a role in autoimmune disease development.