FTY720 enhances the activation-induced apoptosis of donor T cells and modulates graft-versus-host disease

Daigo Hashimoto, Shoji Asakura, Ken Ichi Matsuoka, Yukimi Sakoda, Motoko Koyama, Kazutoshi Aoyama, Mitsune Tanimoto, Teshima Takanori

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

FTY720 is a novel immunosuppressant that improves the outcomes after solid organ and one marrow transplantation (BMT) due to the sequestration of T cells into LN. We tested the hypothesis that the sequestration of donor T cells in LN by FTY720 would enhance their interaction with host APC, thus causing a greater degree of activation-induced apoptosis of alloreactive T cells, and thereby resulting in a reduction of graft-vs.-host disease (GVHD). The short-term administration of FTY720 improved the recipient survival after allogeneic BMT. FTY720 treatment facilitated a rapid contraction of the donor T cell pool in association with an increased degree of apoptosis of donor T cells. The donor T cell reactivity to host alloantigens was diminished in host's LN and adoptive transfer of donor T cells isolated from LN of FTY720-treated recipients of allogeneic BMT induced less severe GVHD in secondary recipients than the transfer from controls. Caspase-dependent apoptosis was involved in this mechanism because FTY720-induced protection was abrogated when a pan-caspase inhibitor was administered. These findings thus demonstrate the presence of a novel mechanism by which FTY720 modulates the allogeneic T cell responses: namely, by the induction of activation-induced apoptosis of alloreactive T cells in LN.

Original languageEnglish
Pages (from-to)271-281
Number of pages11
JournalEuropean Journal of Immunology
Volume37
Issue number1
DOIs
Publication statusPublished - Jan 2007

Keywords

  • Animal models
  • Apoptosis
  • Transplantation

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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