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Updated: Jun 19, 2025

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Graft-Specific Regulatory T Cells for Long-Lasting, Local Tolerance Induction.

Nadja Seltrecht1, Matthias Hardtke-Wolenski1,2, Konstantinos Iordanidis1

  • 1Department of Gastroenterology, Hepatology, Infectious Diseases & Endocrinology, Hannover Medical School, 30625 Hannover, Germany.

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|July 26, 2024
PubMed
Summary

Combining antigen-specific regulatory T cells (Tregs) with existing therapies and lymphopenia-induced T-cell proliferation promotes Treg accumulation in grafts, establishing long-term operational tolerance in transplantation models.

Keywords:
alloantigen-specificimmune toleranceregulatory T cellssolid organ transplantation

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Area of Science:

  • Immunology
  • Transplantation Science
  • Cell Therapy

Background:

  • Immune-mediated graft dysfunction and immunosuppression side effects impede solid organ transplantation.
  • Regulatory T cells (Tregs) are vital for immune modulation post-transplantation, but alone, they are insufficient for allotolerance.
  • Current Treg therapies require enhancement for clinical efficacy.

Purpose of the Study:

  • To enhance the efficacy of adoptive Treg therapy for inducing allotolerance.
  • To investigate immune interventions to improve Treg function and persistence post-transplantation.
  • To facilitate clinical translation of Treg-based therapies.

Main Methods:

  • Utilized an immunogenic skin transplant model in rodents.
  • Employed antigen-specific Tregs for adoptive transfer.
  • Combined Treg therapy with induction therapies and drug-induced T-cell proliferation via lymphopenia.

Main Results:

  • The combined approach significantly increased Treg/T effector ratios.
  • Achieved substantial Treg accumulation within the transplanted graft.
  • Demonstrated long-term operational tolerance in all treated animals.

Conclusions:

  • A novel protocol combining antigen-specific Tregs with induction therapies and lymphopenia-induced T-cell proliferation effectively establishes graft tolerance.
  • This strategy promotes Treg accumulation and long-term graft acceptance.
  • Findings support the potential of this protocol for future clinical trials in organ transplantation.