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[Current concepts of autoimmunity].

J F Bach1

  • 1INSERM U25, Hôpital Necker, Paris.

Revue Neurologique
|October 31, 2002
PubMed
Summary
This summary is machine-generated.

Autoimmunity is normally physiological but becomes pathological when autoreactive cells increase. Defects in immune regulation and expanded antigen recognition contribute to chronic autoimmune diseases like multiple sclerosis.

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Area of Science:

  • Immunology
  • Pathophysiology
  • Autoimmune Diseases

Context:

  • Autoimmunity is a normal physiological process involving autoreactive T and B cells.
  • Autoimmune diseases arise when the number and receptor avidity of autoreactive cells increase, alongside heightened target cell immunogenicity.
  • Factors like viral infections, HLA genes, and T cell repertoire influence disease initiation, with rare cases involving cross-reactivity with infectious agents.

Purpose:

  • To elucidate the mechanisms underlying the transition from physiological autoimmunity to pathological autoimmune diseases.
  • To explore the role of immune dysregulation and regulatory T cell populations in the chronicity of autoimmune conditions.
  • To discuss the evolving understanding of autoantigen specificity and its implications for developing novel immunotherapies.

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Summary:

  • Pathological autoimmunity occurs with increased autoreactive cells and their receptor avidity, influenced by target cell immunogenicity and host genetic factors.
  • Chronic autoimmune diseases, such as multiple sclerosis and myasthenia gravis, often result from defects in immunoregulation involving regulatory T cells (e.g., Th2, Tr1, NKT cells) and cytokines like IL-10 and TGF-β.
  • Autoimmune reactions can spread beyond a single autoantigen, targeting the entire cell, which informs the development of new immunotherapies like soluble autoantigens and modified peptides.

Impact:

  • Provides a framework for understanding the multifaceted nature of autoimmune disease development.
  • Highlights the critical role of immune regulation in preventing chronic autoimmune conditions.
  • Informs the design of targeted immunotherapeutic strategies for autoimmune diseases, moving beyond single-antigen approaches.