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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Am+J+Respir+Crit+Care+Med 2013 ; 187 (12): 1349-59 Nephropedia Template TP
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Cytokine Complex?expanded Natural Killer Cells Improve Allogeneic Lung Transplant Function via Depletion of Donor Dendritic Cells #MMPMID23590269
Jungraithmayr W; Codarri L; Bouchaud G; Krieg C; Boyman O; Gyülvészi G; Becher B; Weder W; Münz C
Am J Respir Crit Care Med 2013[Jun]; 187 (12): 1349-59 PMID23590269show ga
Rationale: Natural killer (NK) cells are innate lymphocytes that target virus-infected and tumor cells. Much less is known about their ability to limit adaptive immune responses.Objectives: Thus, we investigated to what extent NK cells can influence mouse lung allograft rejection.Methods: For this purpose, we employed an orthotopic lung transplantation model in mice.Measurements and Main Results: We demonstrate here that NK cells infiltrate mouse lung allografts before T cells and thereby diminished allograft inflammation, and that NK-cell deficiency enhanced allograft rejection. In contrast, expansion of recipient NK cells through IL-15/IL-15R? complex treatment resulted in decreased T-cell infiltration and alloreactive T-cell priming as well as improved function of the allogeneic lung transplant. Only perforin-competent, but not perforin-deficient, NK cells were able to transfer these beneficial effects into transplanted NK cell?deficient IL-15R??/? mice. These NK cells killed allogeneic dendritic cells (DCs) in vitro and significantly decreased the number of allogeneic DCs in transplanted lungs in vivo. Furthermore, DC-depleted lung allografts presented decreased signs of rejection.Conclusions: These results suggest that NK cells favor allograft acceptance by depleting donor-derived DCs, which otherwise would prime alloreactive T-cell responses. Thus, conditioning regimens that augment NK-cell reactivity should be clinically explored to prepare lung allograft recipients.