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Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Oncotarget 2015 ; 6 (35): 37385-97 Nephropedia Template TP
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Rescuing lymphocytes from HLA-G immunosuppressive effects mediated by the tumor microenvironment #MMPMID26460949
Wu D; Kuiaste I; Moreau P; Carosella E; Yotnda P
Oncotarget 2015[Nov]; 6 (35): 37385-97 PMID26460949show ga
Several studies have demonstrated that the antitumor activities of both T and natural killer (NK) effector populations are limited by the immunosuppressive strategies of tumors. In several malignant transformations, the expression of HLA-G by tumor cells rises dramatically, rendering them strongly immunosuppressive. In this study, we postulated that the absence of HLA-G receptors would prevent the immunosuppressive effects of both soluble and membrane-bound HLA-G. Thus, we investigated the therapeutic potential of effector NK cells genetically modified to downregulate the expression of ILT2 (HLA-G receptor) on their cell surfaces. We have shown that the proliferation of modified NK is still dependent on stimulation signals (no malignant transformation). ILT2? NK cells proliferate, migrate, and eliminate HLA-G negative targets cells to the same extent parental NK cells do. However, in the presence of HLA-G positive tumors, ILT2? NK cells exhibit superior proliferation, conjugate formation, degranulation, and killing activities compared to parent NK cells. We tested the effectiveness of ILT2? NK cells in vivo using a xenograft cancer model and found that silencing ILT2 rescued their anti-tumor activity.We believe that combining ILT2? NK cells with existing therapeutic strategies will strengthen the antitumor response in cancer patients.