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Deprecated: Implicit conversion from float 263.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Transplantation 2014 ; 97 (7): 740-7 Nephropedia Template TP
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Co-transplantation with Myeloid-Derived Suppressor Cells Protects Cell Transplants: A Crucial Role of Inducible Nitric Oxide Synthase #MMPMID24642686
Arakawa Y; Qin J; Chou HS; Bhatt S; Wang L; Stuehr D; Ghosh A; Fung JJ; Lu L; Qian S
Transplantation 2014[Apr]; 97 (7): 740-7 PMID24642686show ga
Background: Islet transplantation is an alternative to pancreas transplantation to cure type 1 diabetes, but both require chronic immunosuppression, which is often accompanied by deleterious side effects. The purpose of this study was to explore prolongation of islet allograft survival by co-transplantation with myeloid-derived suppressor cells (MDSCs) without requirement of immunosuppression, and determine the role of inducible nitric oxide synthase (iNOS) produced by MDSCs in immune regulation. Methods: Bone marrow cells were isolated from wild type (WT) or iNOS?/? mice and cultured in the presence of GM-CSF and hepatic stellate cells (HSCs), resulting in the generation of MDSCs. WT or iNOS?/? MDSCs were co-transplanted with islet allografts under the renal capsule of diabetic recipient mice. Results: Addition of HSCs into DC culture promoted generation of MDSCs (instead of DCs). MDSCs had elevated expression of iNOS upon exposure to IFN-? and inhibited T cell responses in an MLR culture. Co-transplantation with WT MDSCs markedly prolonged survival of islet allografts, which was associated with reduced infiltration of CD8+ T cells due to inhibited proliferative response. These effects were significantly attenuated when MDSCs were deficient in iNOS. Furthermore, iNOS?/? MDSCs largely lost their ability to protect islet allografts. Conclusions: Co-transplantation with HSC-induced MDSCs significantly extends islet allograft survival through iNOS-mediated T cell inhibition. The results demonstrate the potential use of in vitro generated MDSCs as a novel adjunctive immunotherapy for islet transplantation.