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2015 ; 348
(6230
): 136-9
Nephropedia Template TP
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English Wikipedia
Antitumor immunity A shed NKG2D ligand that promotes natural killer cell
activation and tumor rejection
#MMPMID25745066
Deng W
; Gowen BG
; Zhang L
; Wang L
; Lau S
; Iannello A
; Xu J
; Rovis TL
; Xiong N
; Raulet DH
Science
2015[Apr]; 348
(6230
): 136-9
PMID25745066
show ga
Immune cells, including natural killer (NK) cells, recognize transformed cells
and eliminate them in a process termed immunosurveillance. It is thought that
tumor cells evade immunosurveillance by shedding membrane ligands that bind to
the NKG2D-activating receptor on NK cells and/or T cells, and desensitize these
cells. In contrast, we show that in mice, a shed form of MULT1, a high-affinity
NKG2D ligand, causes NK cell activation and tumor rejection. Recombinant soluble
MULT1 stimulated tumor rejection in mice. Soluble MULT1 functions, at least in
part, by competitively reversing a global desensitization of NK cells imposed by
engagement of membrane NKG2D ligands on tumor-associated cells, such as myeloid
cells. The results overturn conventional wisdom that soluble ligands are always
inhibitory and suggest a new approach for cancer immunotherapy.