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EBV-specific memory CD8+ T cell phenotype and function in stable solid organ transplant patients.

Camila Macedo1, Albert Donnenberg, Iulia Popescu

  • 1Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, PA, USA.

Transplant Immunology
|June 7, 2005
PubMed
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Immune responses to Epstein-Barr virus (EBV) in immunosuppressed solid organ transplant (SOTx) recipients show expanded effector memory CD8+ T cells. However, these EBV-specific T cells exhibit reduced IFN-gamma production, indicating impaired functional activation rather than depletion.

Area of Science:

  • Immunology
  • Transplantation
  • Virology

Background:

  • Immune responses to Epstein-Barr virus (EBV) in immunosuppressed (IS) solid organ transplant (SOTx) recipients are not well understood.
  • Characterizing EBV-specific CD8+ T cells is crucial for managing post-transplant complications.

Purpose of the Study:

  • To evaluate the phenotype and function of EBV-specific CD8+ T cells in stable IS SOTx recipients.
  • To compare EBV-specific T cell responses in IS SOTx patients with healthy donors.

Main Methods:

  • Flow cytometry using HLA-A2 tetramers with EBV peptides (lytic and latent) and memory markers (CD45RO, CD45RA, CD62L).
  • Interferon-gamma (IFN-gamma) production measured by ELISPOT assay upon EBV peptide stimulation.

Main Results:

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  • IS SOTx patients and healthy donors had similar frequencies and specificities of anti-EBV CD8+ T cells.
  • A significant expansion of the effector memory (CD45RO+/CD62L-) CD8+ T cell pool, including EBV-specific cells, was observed in IS SOTx patients.
  • EBV-specific CD8+ T cells from IS SOTx patients showed decreased IFN-gamma production compared to healthy donors.

Conclusions:

  • Impairment of EBV-specific CD8+ T cell activity in IS SOTx recipients is not due to clonal depletion.
  • The reduced T cell activity is primarily caused by impaired functional activation, despite an expanded effector memory pool.