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2018 ; 9
(ä): 282
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Dexamethasone-Induced Myeloid-Derived Suppressor Cells Prolong Allo Cardiac Graft
Survival through iNOS- and Glucocorticoid Receptor-Dependent Mechanism
#MMPMID29497426
Zhao Y
; Shen XF
; Cao K
; Ding J
; Kang X
; Guan WX
; Ding YT
; Liu BR
; Du JF
Front Immunol
2018[]; 9
(ä): 282
PMID29497426
show ga
How to induce immune tolerance without long-term need for immunosuppressive drugs
has always been a central problem in solid organ transplantation. Modulating
immunoregulatory cells represents a potential target to resolve this problem.
Myeloid-derived suppressor cells (MDSCs) are novel key immunoregulatory cells in
the context of tumor development or transplantation, and can be generated in
vitro. However, none of current systems for in vitro differentiation of MDSCs
have successfully achieved long-term immune tolerance. Herein, we combined
dexamethasone (Dex), which is a classic immune regulatory drug in the clinic,
with common MDSCs inducing cytokine granulocyte macrophage colony stimulating
factor (GM-CSF) to generate MDSCs in vitro. Addition of Dex into GM-CSF system
specifically increased the number of CD11b(+) Gr-1(int/low) MDSCs with an
enhanced immunosuppressive function in vitro. Adoptive transfer of these MDSCs
significantly prolonged heart allograft survival and also favored the expansion
of regulatory T cells in vivo. Mechanistic studies showed that inducible nitric
oxide sythase (iNOS) signaling was required for MDSCs in the control of T-cell
response and glucocorticoid receptor (GR) signaling played a critical role in the
recruitment of transferred MDSCs into allograft through upregulating CXCR2
expression on MDSCs. Blockade of GR signaling with its specific inhibitor or
genetic deletion of iNOS reversed the protective effect of Dex-induced MDSCs on
allograft rejection. Together, our results indicated that co-application of Dex
and GM-CSF may be a new and important strategy for the induction of potent MDSCs
to achieve immune tolerance in organ transplantation.