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Related Experiment Videos

B cell tolerance and autoimmunity.

T Tsubata1, T Honjo

  • 1Department of Immunology, Medical Research Institute, Tokyo Medical and Dental University, Japan. tsubata.imm@mri.tmd.ac.jp

Reviews in Immunogenetics
|April 28, 2001
PubMed
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B cell tolerance prevents autoimmunity through mechanisms like deletion and anergy, influenced by B cell maturity and self-antigen type. Apoptosis and environmental factors can disrupt this crucial self-tolerance.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Self-tolerance in B cells is essential for preventing autoimmune diseases.
  • B cell tolerance is established through multiple mechanisms including clonal deletion, anergy, receptor editing, and maturation arrest.
  • The specific tolerance mechanism employed is determined by B cell maturational stage and self-antigen characteristics.

Purpose of the Study:

  • To explore the multifaceted mechanisms of B cell self-tolerance induction and maintenance.
  • To investigate factors that can lead to the abrogation of B cell tolerance.
  • To elucidate the role of B cell apoptosis in the regulation of self-tolerance.

Main Methods:

  • Analysis of B cell maturational stages and their interaction with self-antigens.
  • Investigation of molecular regulators of B cell apoptosis, including inhibitory co-receptors, CD19, T cell help, and Fas (CD95).

Related Experiment Videos

  • Examination of environmental factors, such as intestinal lipopolysaccharide, on B cell tolerance.

    • Main Results:

    • B cell tolerance mechanisms vary based on B cell development stage and self-antigen properties.
    • Defects in inhibitory co-receptors, CD19 overexpression, T cell help, and Fas pathway dysfunction can impair B cell tolerance.
    • B cell apoptosis, regulated by antigen receptor and Fas signaling, appears critical for tolerance induction and maintenance.
    • Environmental factors like intestinal lipopolysaccharide can contribute to the breakdown of B cell tolerance.

    Conclusions:

    • B cell tolerance is a complex process involving multiple intrinsic and extrinsic regulatory pathways.
    • Dysregulation of B cell apoptosis and environmental influences are significant factors in the loss of self-tolerance.
    • Understanding these mechanisms is crucial for developing strategies to combat autoimmune diseases.