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Related Experiment Videos

Factors affecting thymic function after allogeneic hematopoietic stem cell transplantation.

K Weinberg1, B R Blazar, J E Wagner

  • 1Division of Research Immunology/Bone Marrow Transplantation, Childrens Hospital Los Angeles, CA 90027, USA. kweinberg@chla.usc.edu

Blood
|February 27, 2001
PubMed
Summary

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In Vitro Induction of Human Regulatory T Cells Using Conditions of Low Tryptophan Plus Kynurenines.

American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons·2017

Hematopoietic stem cell transplantation (HSCT) impairs T-cell regeneration. Graft-versus-host disease (GVHD) significantly reduces thymic output, measured by T-cell receptor excision circles (TRECs), impacting long-term immune recovery.

Area of Science:

  • Immunology
  • Hematology
  • Transplantation Medicine

Background:

  • Hematopoietic stem cell transplantation (HSCT) leads to severe immunodeficiency due to impaired T-cell generation.
  • Assessing thymic function post-HSCT is crucial for understanding immune reconstitution.
  • Naive T-cell counts may not accurately reflect recent thymic emigrants after HSCT.

Purpose of the Study:

  • To accurately measure thymic output after HSCT using T-cell receptor excision circles (TRECs).
  • To identify factors influencing thymic function and T-cell recovery post-HSCT.
  • To investigate the impact of graft-versus-host disease (GVHD) on thymopoiesis.

Main Methods:

  • Quantification of TRECs in CD4+ and CD8+ T cells from patients undergoing HSCT.
  • Correlation of TREC levels with phenotypically naive T cells.

Related Experiment Videos

  • Analysis of factors including GVHD history, graft type, and age on TREC levels.

    • Main Results:

    • TREC levels increased post-HSCT and persisted for years, correlating with naive T-cell frequency.
    • Chronic GVHD was strongly associated with persistently low TREC levels.
    • Matched sibling grafts showed higher TREC levels compared to unrelated donor grafts.

    Conclusions:

    • GVHD is a major inhibitor of post-transplant thymopoiesis.
    • TRECs provide a reliable measure of thymic output after HSCT.
    • Further research is needed to clarify the roles of age and preparative regimens in thymopoietic capacity.