Immunoregulatory profiles in liver transplant recipients on different immunosuppressive agents

Josh Levitsky*, Joshua Miller, Edward Wang, Anne Rosen, Cathy Flaa, Michael Abecassis, James Mathew, Anat Tambur

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

We compared peripheral blood immunophenotyping in 31 adult liver transplant recipients on differing long-term immunosuppressive (IS) monotherapy with and without peri-transplantation alemtuzumab (AL) induction. All patients had been stable on monotherapy with either sirolimus (SRL) (n = 10) or without SRL (tacrolimus (TAC) (n = 10), mycophenolate mofetil (MMF) (n = 11)) for more than 6 months. Five-color flow cytometry for putative "regulatory" T and dendritic cells as well as serum assays for soluble HLA-G (sHLA-G) were performed. The SRL monotherapy group had significantly higher percentages of CD4+CD25high+Foxp3+ T cells (1.3 ± 1.0) compared with the non-SRL group (0.7 ± 0.6) (p = 0.04). The SRL effect was even higher in a subset with prior AL induction and no prior hepatitis C or rejection (1.7 ± 0.2) compared with all other subgroups (0.7 ± 0.6) (p = 0.02). TAC patients showed significantly higher "regulatory" DC2:DC1 ratios (10 ± 7.6) compared with non-TAC patients (4.1 ± 2.3) (p = 0.04). Although sHLA-G levels appeared higher in TAC patients, the differences were not statistically significant. In conclusion, IS monotherapy provides an opportunity to investigate regulatory roles of individual agents. SRL maintenance and prior AL induction in subsets of patients appeared to show a regulatory T cell immunophenotype. However, TAC patients may have other regulatory characteristics, supporting the need for larger, prospective studies to clarify differences.

Original languageEnglish (US)
Pages (from-to)146-150
Number of pages5
JournalHuman Immunology
Volume70
Issue number3
DOIs
StatePublished - Mar 2009

Keywords

  • Dendritic cells
  • Immunophenotyping
  • Immunosuppression
  • Liver transplantation
  • Regulatory T cells

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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