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2017 ; 129
(12
): 1718-1728
Nephropedia Template TP
gab.com Text
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English Wikipedia
Tolerogenic interactions between CD8(+) dendritic cells and NKT cells prevent
rejection of bone marrow and organ grafts
#MMPMID28096089
Hongo D
; Tang X
; Zhang X
; Engleman EG
; Strober S
Blood
2017[Mar]; 129
(12
): 1718-1728
PMID28096089
show ga
The combination of total lymphoid irradiation and anti-T-cell antibodies safely
induces immune tolerance to combined hematopoietic cell and organ allografts in
humans. Our mouse model required host natural killer T (NKT) cells to induce
tolerance. Because NKT cells normally depend on signals from CD8(+) dendritic
cells (DCs) for their activation, we used the mouse model to test the hypothesis
that, after lymphoid irradiation, host CD8(+) DCs play a requisite role in
tolerance induction through interactions with NKT cells. Selective deficiency of
either CD8(+) DCs or NKT cells abrogated chimerism and organ graft acceptance.
After radiation, the CD8(+) DCs increased expression of surface molecules
required for NKT and apoptotic cell interactions and developed suppressive immune
functions, including production of indoleamine 2,3-deoxygenase. Injection of
naive mice with apoptotic spleen cells generated by irradiation led to DC changes
similar to those induced by lymphoid radiation, suggesting that apoptotic body
ingestion by CD8(+) DCs initiates tolerance induction. Tolerogenic CD8(+) DCs
induced the development of tolerogenic NKT cells with a marked T helper 2 cell
bias that, in turn, regulated the differentiation of the DCs and suppressed
rejection of the transplants. Thus, reciprocal interactions between CD8(+) DCs
and invariant NKT cells are required for tolerance induction in this system that
was translated into a successful clinical protocol.
|*Immune Tolerance
[MESH]
|Animals
[MESH]
|Bone Marrow Transplantation
[MESH]
|CD8-Positive T-Lymphocytes/immunology
[MESH]
|Cell Communication/immunology
[MESH]
|Dendritic Cells/*immunology
[MESH]
|Graft Rejection/immunology/*prevention & control
[MESH]