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2013 ; 121
(7
): 1220-8
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Murine anti-third-party central-memory CD8(+) T cells promote hematopoietic
chimerism under mild conditioning: lymph-node sequestration and deletion of
anti-donor T cells
#MMPMID23223359
Ophir E
; Or-Geva N
; Gurevich I
; Tal O
; Eidelstein Y
; Shezen E
; Margalit R
; Lask A
; Shakhar G
; Hagin D
; Bachar-Lustig E
; Reich-Zeliger S
; Beilhack A
; Negrin R
; Reisner Y
Blood
2013[Feb]; 121
(7
): 1220-8
PMID23223359
show ga
Transplantation of T cell-depleted BM (TDBM) under mild conditioning, associated
with minimal toxicity and reduced risk of GVHD, offers an attractive therapeutic
option for patients with nonmalignant hematologic disorders and can mediate
immune tolerance to subsequent organ transplantation. However, overcoming TDBM
rejection after reduced conditioning remains a challenge. Here, we address this
barrier using donorderived central memory CD8(+) T cells (Tcms), directed against
third-party antigens. Our results show that fully allogeneic or
(hostXdonor)F1-Tcm, support donor chimerism (> 6 months) in sublethally
irradiated (5.5Gy) mice, without GVHD symptoms. Chimerism under yet lower
irradiation (4.5Gy) was achieved by combining Tcm with short-term administration
of low-dose Rapamycin. Importantly, this chimerism resulted in successful donor
skin acceptance, whereas third-party skin was rejected. Tracking of host
anti-donor T cells (HADTCs), that mediate TDBMT rejection, in a novel
bioluminescence-imaging model revealed that Tcms both induce accumulation and
eradicate HADTCs in the LNs,concomitant with their elimination from other organs,
including the BM. Further analysis with 2-photon microcopy revealed that Tcms
form conjugates with HADTCs, resulting in decelerated and confined movement of
HADTCs within the LNs in an antigen-specific manner. Thus, anti-third-party Tcms
support TDBMT engraftment under reduced-conditioning through lymph-node
sequestration and deletion of HADTCs, offering a novel and potentially safe
approach for attaining stable hematopoietic chimerism.
|Animals
[MESH]
|Bone Marrow Transplantation/immunology
[MESH]
|CD8-Positive T-Lymphocytes/*immunology
[MESH]
|Female
[MESH]
|Graft vs Host Disease/immunology/prevention & control
[MESH]