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Related Experiment Videos

Phenotypic changes with immunosuppression in human recipients.

Thomas F Mueller1

  • 1Department of Medicine, Renal Division, Molecular Immunology-Immunogenetics, Brigham and Women's Hospital, Harvard Medical School, Boston, MA02115, USA. tmueller@rics.bwh.harvard.edu

Frontiers in Bioscience : a Journal and Virtual Library
|September 6, 2003
PubMed
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Immunosuppressive therapy in transplant medicine alters T cell subsets, leading to immune system aging. Depleting therapies expand terminally differentiated T cells with regulatory roles.

Area of Science:

  • Immunology
  • Transplant Medicine
  • Cellular Biology

Background:

  • Lymphocyte subset differentiation is crucial in transplant medicine.
  • Immunosuppressive therapy significantly impacts circulating T cell populations.
  • Understanding these changes is vital for managing transplant outcomes.

Purpose of the Study:

  • To review alterations in T cell surface molecule expression during immunosuppressive therapy.
  • To correlate phenotypic changes with T cell development, thymic involution, and disease/treatment effects.
  • To investigate the implications of these changes for immune system aging in transplant patients.

Main Methods:

  • Review of literature on T cell phenotyping in transplant recipients.
  • Analysis of surface molecule expression changes on circulating T cells.

Related Experiment Videos

  • Correlation of phenotypic data with immunosuppressive treatment regimens and clinical outcomes.

    • Main Results:

    • Depleting therapies (e.g., antibody treatments) profoundly affect T cell subsets.
    • Lymphopenia-induced proliferation results in expanded CD8+CD57+CD28- T cells, a terminally differentiated subset.
    • These expanded cells exhibit characteristics linked to suppressor and regulatory functions.
    • Transplant patients display immune cell phenotypes resembling those seen in aging individuals.

    Conclusions:

    • Immunosuppressive therapy induces significant T cell phenotypic shifts in transplant patients.
    • The expansion of terminally differentiated T cells suggests a novel homeostasis with regulatory implications.
    • Transplant-associated immune changes mimic accelerated immune system aging.