TY - JOUR
T1 - Induction of tolerance to bone marrow allografts by donor-derived host nonreactive ex vivo-induced central memory CD8 T cells
AU - Ophir, Eran
AU - Eidelstein, Yaki
AU - Afik, Ran
AU - Bachar-Lustig, Esther
AU - Reisner, Yair
PY - 2010/3/11
Y1 - 2010/3/11
N2 - 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.
AB - 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.
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U2 - 10.1182/blood-2009-10-248716
DO - 10.1182/blood-2009-10-248716
M3 - Article
C2 - 20042725
AN - SCOPUS:77950424584
SN - 0006-4971
VL - 115
SP - 2095
EP - 2104
JO - Blood
JF - Blood
IS - 10
ER -