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Anti-CD4 mediates clonal anergy during transplantation tolerance induction
S E Alters1, J A Shizuru, J Ackerman
1Department of Medicine, Stanford University School of Medicine, California 94305.
The Journal of Experimental Medicine
|February 1, 1991
Summary
Depleting CD4+ T cells with anti-CD4 antibodies induces tolerance to pancreatic islet transplants. This tolerance occurs via T cell anergy, not deletion, and can be reversed with interleukin-2.
Area of Science:
- Immunology
- Transplantation immunology
- T cell biology
Background:
- Depletion of CD4+ T cells using anti-CD4 monoclonal antibodies is a known method for inducing allograft tolerance.
- The precise mechanisms underlying this tolerance, particularly concerning specific T cell populations, require further elucidation.
Purpose of the Study:
- To investigate the mechanism of anti-CD4-mediated tolerance in pancreatic islet transplantation.
- To determine whether clonal deletion or anergy is responsible for the observed tolerance.
Main Methods:
- Induction of tolerance to pancreatic islets in a mouse model using anti-CD4 monoclonal antibodies.
- Analysis of T cell populations, specifically V beta 11+ T cells (both CD4+ and CD8+), for evidence of deletion or anergy.
- In vitro experiments to assess the effect of recombinant interleukin-2 on T cell function.
Main Results:
- Anti-CD4-mediated tolerance to pancreatic islet allografts was achieved in the absence of clonal deletion of potentially reactive T cells.
- A state of clonal anergy was induced in both CD4+V beta 11+ and CD8+V beta 11+ T cell subsets.
- Recombinant interleukin-2 partially overcame this induced clonal anergy in vitro.
Conclusions:
- Anti-CD4 antibody-induced allograft tolerance is mediated by T cell anergy rather than clonal deletion.
- Both CD4+ and CD8+ T cell subsets contribute to this anergic state.
- Interleukin-2 plays a role in modulating T cell responses and may be a target for overcoming transplant tolerance.