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- W4362546985 abstract "<div>Abstract<p>Resistance to cytotoxic T cells is frequently mediated by loss of MHC class I expression or IFNγ signaling in tumor cells, such as mutations of <i>B2M</i> or <i>JAK1</i> genes. Natural killer (NK) cells could potentially target such resistant tumors, but suitable NK-cell–based strategies remain to be developed. We hypothesized that such tumors could be targeted by NK cells if sufficient activating signals were provided. Human tumors frequently express the MICA and MICB ligands of the activating NKG2D receptor, but proteolytic shedding of MICA/B represents an important immune evasion mechanism in many human cancers. We showed that <i>B2M</i>- and <i>JAK1</i>-deficient metastases were targeted by NK cells following treatment with a mAb that blocks MICA/B shedding. We also demonstrated that the FDA-approved HDAC inhibitor panobinostat and a MICA/B antibody acted synergistically to enhance MICA/B surface expression on tumor cells. The HDAC inhibitor enhanced MICA/B gene expression, whereas the MICA/B antibody stabilized the synthesized protein on the cell surface. The combination of panobinostat and the MICA/B antibody reduced the number of pulmonary metastases formed by a human melanoma cell line in NOD/SCID gamma mice reconstituted with human NK cells. NK-cell–mediated immunity induced by a mAb specific for MICA/B, therefore, provides an opportunity to target tumors with mutations that render them resistant to cytotoxic T cells.</p></div>" @default.
- W4362546985 created "2023-04-06" @default.
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- W4362546985 date "2023-04-04" @default.
- W4362546985 modified "2023-10-01" @default.
- W4362546985 title "Data from Inhibition of MICA and MICB Shedding Elicits NK-Cell–Mediated Immunity against Tumors Resistant to Cytotoxic T Cells" @default.
- W4362546985 doi "https://doi.org/10.1158/2326-6066.c.6550462.v1" @default.
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