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Molecular and cellular aspects of immunologic tolerance
1Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Australia.
European Journal of Biochemistry
|December 18, 1991
Summary
The immune system distinguishes self from non-self through clonal abortion and clonal anergy, processes that eliminate or inactivate self-reactive lymphocytes. Transgenic mouse models reveal these mechanisms depend on antigen presentation and lymphocyte receptor affinity.
Area of Science:
- Immunology
- Biochemistry
- Molecular Biology
Background:
- Self/non-self discrimination is crucial for immune system function.
- Historical models proposed "holes" in lymphocyte recognition repertoires to explain tolerance.
- Two primary mechanisms, clonal abortion and clonal anergy, were hypothesized to maintain self-tolerance.
Purpose of the Study:
- To review recent data on immune self/non-self discrimination for a biochemical audience.
- To explain the mechanisms of tolerance in B cells and T cells.
- To highlight the impact of transgenic mouse technology on understanding tolerance.
Main Methods:
- Review of experimental data on lymphocyte recognition and tolerance.
- Survey of historical experiments in conventional mice.
- Emphasis on transgenic mouse models developed since 1988.
Main Results:
- Transgenic mice enabled detailed study of clonal abortion and anergy.
- Both T cell and B cell tolerance mechanisms were experimentally validated.
- T cell tolerance depends on thymic antigen presence; B cell tolerance is influenced by antigen concentration, presentation, and receptor affinity.
Conclusions:
- Clonal abortion and anergy are key mechanisms for maintaining immune tolerance.
- The specific tolerance pathway (abortion vs. anergy) is context-dependent.
- Transgenic mouse technology has been instrumental in elucidating these complex immunological processes.