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- W1970050903 abstract "Human leukocyte antigen–G (HLA-G) is a nonclassical tolerogenic molecule that can be expressed either as membrane bound (HLA-G1) or secreted (HLA-G5) isoforms. Upregulation of HLA-G1 or HLA-G5 expression by tumor cells constitutes an efficient way to escape from antitumoral immune responses. The inhibitory role of HLA-G1 on NK cell cytotoxicity is well characterized; however, that of the HLA-G5 isoform secreted by tumor is poorly understood. Our results indicate that the HLA-G5 isoform secreted by M8 melanoma cells is able to protect them from natural killer leukemia cell line (NKL) cytotoxicity. Analysis of NKL/M8-HLA-G5 conjugates by confocal microscopy demonstrates that the inhibition of NKL cytotoxic activity resulted from an impairment of NKL actin reorganization and perforin granules polarization toward M8-HLA-G5 target cell. This study also indicates that HLA-G5 soluble isoform remains evenly distributed in the cytoplasm of M8-HLA-G5 conjugated to NKL cells, suggesting that HLA-G5 does not require to polarize toward effector cell to induce efficient inhibition. These results highlight the inhibitory mechanisms mediated through HLA-G5 leading to tumor escape from NK cell cytotoxicity." @default.
- W1970050903 created "2016-06-24" @default.
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- W1970050903 date "2009-12-01" @default.
- W1970050903 modified "2023-10-11" @default.
- W1970050903 title "Human melanoma cell secreting human leukocyte antigen–G5 inhibit natural killer cell cytotoxicity by impairing lytic granules polarization toward target cell" @default.
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- W1970050903 doi "https://doi.org/10.1016/j.humimm.2009.07.019" @default.
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