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Related Experiment Videos

Tolerance and suppression in a primed immune system

S E Marshall1, S P Cobbold, J D Davies

  • 1Department of Pathology, University of Cambridge, United Kingdom.

Transplantation
|December 15, 1996
PubMed
Summary

Inducing immune tolerance is challenging. Researchers found that short antibody treatments can create long-term tolerance in mice by enabling CD4+ T cells to regulate, rather than eliminate, other immune cells, preventing graft rejection.

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Area of Science:

  • Immunology
  • Transplantation immunology

Background:

  • Inducing immune tolerance in a primed immune system is therapeutically desirable but challenging.
  • Primed mice reject secondary grafts via CD4+ or CD8+ T cells.

Purpose of the Study:

  • To investigate mechanisms of peripheral T-cell tolerance induction and maintenance.
  • To determine if tolerance can be achieved without eliminating all antigen-reactive cells.

Main Methods:

  • Mice primed to minor histocompatibility antigens received short courses of nonlytic anti-CD4 and anti-CD8 antibodies.
  • Mechanisms of tolerance maintenance were studied, including the role of CD4+ T cells.
  • CD4+ T cells were eliminated from tolerant mice to assess graft rejection.

Main Results:

Related Experiment Videos

  • Short antibody treatments induced long-term peripheral T-cell tolerance in primed mice.
  • Tolerant mice maintained CD4+ T cells that suppressed rejection mediated by CD4+ or CD8+ T cells.
  • Elimination of CD4+ T cells from tolerant mice led to graft rejection, indicating ongoing regulation of CD8+ T cells.

Conclusions:

  • Therapeutic operational tolerance may be achievable without permanently inactivating all antigen-reactive cells.
  • Peripheral tolerance can be maintained through active regulation by CD4+ T cells, rather than solely through cell deletion.