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• W1614344254 startingPage "4606" @default.
• W1614344254 abstract "Abstract Most tumors grow in immunocompetent hosts despite expressing NKG2D ligands (NKG2DLs) such as the MHC class I chain-related genes A and B (MICA/B). However, their participation in tumor cell evasion is still not completely understood. Here we demonstrate that several human melanomas (cell lines and freshly isolated metastases) do not express MICA on the cell surface but have intracellular deposits of this NKG2DL. Susceptibility to NK cell-mediated cytotoxicity correlated with the ratio of NKG2DLs to HLA class I molecules but not with the amounts of MICA on the cell surface of tumor cells. Transfection-mediated overexpression of MICA restored cell surface expression and resulted in an increased in vitro cytotoxicity and IFN-γ secretion by human NK cells. In xenografted nude mice, these melanomas exhibited a delayed growth and extensive in vivo apoptosis. Retardation of tumor growth was due to NK cell-mediated antitumor activity against MICA-transfected tumors, given that this effect was not observed in NK cell-depleted mice. Also, mouse NK cells killed MICA-overexpressing melanomas in vitro. A mechanistic analysis revealed the retention of MICA in the endoplasmic reticulum, an effect that was associated with accumulation of endoH-sensitive (immature) forms of MICA, retrograde transport to the cytoplasm, and degradation by the proteasome. Our study identifies a novel strategy developed by melanoma cells to evade NK cell-mediated immune surveillance based on the intracellular sequestration of immature forms of MICA in the endoplasmic reticulum. Furthermore, this tumor immune escape strategy can be overcome by gene therapy approaches aimed at overexpressing MICA on tumor cells." @default.
• W1614344254 created "2016-06-24" @default.
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• W1614344254 date "2008-04-01" @default.
• W1614344254 modified "2023-09-26" @default.
• W1614344254 title "Intracellular Retention of the NKG2D Ligand MHC Class I Chain-Related Gene A in Human Melanomas Confers Immune Privilege and Prevents NK Cell-Mediated Cytotoxicity" @default.
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• W1614344254 doi "https://doi.org/10.4049/jimmunol.180.7.4606" @default.
• W1614344254 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18354183" @default.
• W1614344254 hasPublicationYear "2008" @default.
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