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Related Experiment Videos

Split tolerance in chimeric GVH mice.

C Baron1, P Lang, V Bierre

  • 1Department of Nephrology, H pital Henri Mondor, Creteil, France.

Transplant International : Official Journal of the European Society for Organ Transplantation
|January 1, 1994
PubMed
Summary
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Graft-versus-host reaction (GVHR) in mice leads to a chimeric state with split tolerance. A radiosensitive thymus-dependent mechanism is crucial for maintaining self-tolerance after GVHR.

Area of Science:

  • Immunology
  • Transplantation Biology

Background:

  • Graft-versus-host reaction (GVHR) induced by parental spleen cells in F1 hybrid mice causes immune deficiency.
  • The B10D2 --> (B10.BRx B10.D2) F1 strain combination model exhibits thymic injury and transient cellular immune deficiency post-GVHR.

Purpose of the Study:

  • To analyze the immune status 60 days after GVHR induction.
  • To investigate the mechanisms of self-tolerance in GVH chimeric mice.

Main Methods:

  • Phenotypic analysis of spleen cells to assess chimerism.
  • Cytotoxic T lymphocyte (CTL) response assays against allogeneic cells.
  • Mixed lymphocyte culture (MLC) to evaluate reactivity against F1 hybrid cells.
  • In vivo studies including induction of GVHR and bone marrow (BM) cell transplantation.

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Main Results:

  • Mice showed 85% chimerism with parental lymphocytes and restored anti-allogeneic CTL response.
  • GVH chimeric splenocytes were unresponsive in MLC but showed anti-F1 CTL reactivity.
  • F1 GVH mice rejected F1 BM cells, but grafting a neonatal parental thymus prevented rejection and restored CTL alloreactivity.

Conclusions:

  • GVHR-induced chimerism is associated with split tolerance.
  • A radiosensitive, thymic-dependent mechanism maintains self-tolerance in these chimeric mice.