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[Principal mechanisms of autoimmunity]
1Laboratoire d'immunologie, Centre hospitalier universitaire, Brest.
La Revue Du Praticien
|January 1, 1994
Summary
The immune system maintains self-tolerance through T lymphocyte and B cell mechanisms. Autoimmunity can arise when these tolerance checkpoints fail, potentially causing organ damage.
Area of Science:
- Immunology
- Autoimmunity research
- Cellular tolerance mechanisms
Context:
- Immune tolerance is crucial for preventing autoimmune diseases.
- T lymphocyte tolerance occurs via clonal deletion in the thymus and clonal anergy peripherally.
- B cell repertoire is biased towards low-affinity autoantibodies.
Purpose:
- To explain the mechanisms of immune tolerance.
- To identify pathways that bypass immune tolerance.
- To understand the perpetuation and complications of autoimmunity.
Summary:
- Immune tolerance, involving T lymphocytes and B cells, prevents autoimmunity.
- Tolerance can be bypassed by B cell polyclonal activation, autoantigen driving, or MHC molecule engagement.
- Deficiencies in immune control systems perpetuate autoimmunity, leading to visceral complications. Both autoantibodies and T lymphocytes can be pathogenic, alongside immune complexes.
Impact:
- Provides insight into the breakdown of immune tolerance.
- Highlights potential therapeutic targets for autoimmune diseases.
- Enhances understanding of pathogenic mechanisms in autoimmunity.