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2017 ; 6
(9
): e1339854
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Soluble NKG2D ligands in the ovarian cancer microenvironment are associated with
an adverse clinical outcome and decreased memory effector T cells independent of
NKG2D downregulation
#MMPMID28932639
Vyas M
; Reinartz S
; Hoffmann N
; Reiners KS
; Lieber S
; Jansen JM
; Wagner U
; Müller R
; von Strandmann EP
Oncoimmunology
2017[]; 6
(9
): e1339854
PMID28932639
show ga
The immune receptor NKG2D is predominantly expressed on NK cells and T cell
subsets and confers anti-tumor activity. According to the current paradigm,
immune surveillance is counteracted by soluble ligands shed into the
microenvironment, which down-regulate NKG2D receptor expression. Here, we
analyzed the clinical significance of the soluble NKG2D ligands sMICA and sULBP2
in the malignancy-associated ascites of ovarian cancer. We show that high levels
of sMICA and sULBP2 in ascites were associated with a poor prognosis. Ascites
inhibited the activation of normal NK cells, which, in contrast to the prevailing
notion, was not associated with decreased NKG2D expression. Of note, an inverse
correlation of soluble NKG2D ligands with effector memory T cells and a direct
correlation with pro-tumorigenic CD163(+)CD206(+) macrophages was observed. Thus,
the role of soluble NKG2D ligands within the ovarian cancer microenvironment is
more complex than anticipated and does not exclusively function via NKG2D
downregulation.