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Chimerism and immunological tolerance in solid organ transplantation.

Birte Ohm1, Anastasios D Giannou2,3,4,5,6, David Harriman6

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Chimerism, the mix of donor and host cells, is key in organ transplants. Inducing stable chimerism could enable donor-specific tolerance, reducing lifelong immunosuppression and improving graft survival.

Keywords:
ChimerismDonorFeto-maternal microchimerismOrgan transplantationRecipientTolerance

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Area of Science:

  • Immunology
  • Transplantation Biology
  • Cellular Biology

Background:

  • Solid organ transplantation necessitates long-term immunosuppression due to host immune responses against the graft.
  • Chimerism, the presence of donor-derived cells within the recipient, is a natural consequence of organ transplantation.
  • Achieving donor-specific immunological tolerance is crucial for long-term graft survival and reducing immunosuppressive drug toxicity.

Purpose of the Study:

  • To review the historical development, clinical outcomes, and scientific principles of chimerism-based tolerance in solid organ transplantation.
  • To explore the potential of deliberately inducing stable mixed bone marrow chimerism for achieving donor-specific tolerance.
  • To discuss the role of naturally occurring feto-maternal microchimerism in immune tolerance relevant to organ transplantation.

Main Methods:

  • Review of existing literature on chimerism and transplantation tolerance.
  • Analysis of historical data and clinical case series.
  • Examination of the biological mechanisms underlying chimerism-induced immune tolerance.

Main Results:

  • Stable mixed bone marrow chimerism has been established in animal models and shows promise in clinical settings.
  • Current conditioning regimens for inducing chimerism are associated with significant toxicity, limiting widespread clinical application.
  • Feto-maternal microchimerism demonstrates the capacity of naturally occurring chimerism to induce immune tolerance.

Conclusions:

  • Deliberate induction of stable chimerism offers a promising strategy to achieve donor-specific tolerance in organ transplant recipients.
  • Overcoming the toxicity of conditioning regimens is essential for the clinical translation of chimerism-based tolerance strategies.
  • Understanding microchimerism provides insights into natural mechanisms of immune tolerance that could be leveraged in transplantation.