Induction of tolerance to bone marrow allografts by donor-derived host nonreactive ex vivo-induced central memory CD8 T cells

Eran Ophir, Yaki Eidelstein, Ran Afik, Esther Bachar-Lustig, Yair Reisner

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Enabling engraftment of allogeneic T cell-depleted bone marrow (TDBM) under reduced-intensity conditioning represents a major challenge in bone marrow transplantation (BMT). Anti-third-party cytotoxic T lymphocytes (CTLs) were previously shown to be endowed with marked ability to delete host antidonor T cells in vitro, but were found to be less effective in vivo. This could result from diminished lymph node (LN) homing caused by the prolonged activation, which induces a CD44+CD62L- effector phenotype, and thereby prevents effective colocalization with, and neutralization of, alloreactive host T cells (HTCs). In the present study, LN homing, determined by imaging, was enhanced upon culture conditions that favor the acquisition of CD44 +CD62L+ central memory cell (Tcm) phenotype by anti-third-party CD8+ cells. These Tcmlike cells displayed strong proliferation and prolonged persistence in BM transplant recipients. Importantly, adoptively transferred HTCs bearing a transgenic T-cell receptor (TCR) with antidonor specificity were efficiently deleted only by donor-type Tcms. All these attributes were found to be associated with improved efficacy in overcoming T cell-mediated rejection of TDBM, thereby enabling high survival rate and long-term donor chimerism, without causing graft-versus-host disease. In conclusion, anti-third-party Tcms, which home to recipient LNs and effectively delete antidonor T cells, could provide an effective and novel tool for overcoming rejection of BM allografts.

Original languageEnglish (US)
Pages (from-to)2095-2104
Number of pages10
JournalBlood
Volume115
Issue number10
DOIs
StatePublished - Mar 11 2010

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology

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