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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Respir+Crit+Care+Med
2013 ; 187
(12
): 1349-59
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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
PMID23590269
show 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.