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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Science 2018 ; 359 (6377): 770-5 Nephropedia Template TP
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A major chromatin regulator determines resistance of tumor cells to T cell?mediated killing #MMPMID29301958
Pan D; Kobayashi A; Jiang P; de Andrade LF; Tay RE; Luoma AM; Tsoucas D; Qiu X; Lim K; Rao P; Long HW; Yuan GC; Doench J; Brown M; Liu XS; Wucherpfennig KW
Science 2018[Feb]; 359 (6377): 770-5 PMID29301958show ga
Many human cancers are resistant to immunotherapy, for reasons that are poorly understood. We used a genome-scale CRISPR-Cas9 screen to identify mechanisms of tumor cell resistance to killing by cytotoxic T cells, the central effectors of antitumor immunity. Inactivation of >100 genes?including Pbrm1, Arid2, and Brd7, which encode components of the PBAF form of the SWI/SNF chromatin remodeling complex?sensitized mouse B16F10 melanoma cells to killing by T cells. Loss of PBAF function increased tumor cell sensitivity to interferon-?, resulting in enhanced secretion of chemokines that recruit effector T cells. Treatment-resistant tumors became responsive to immunotherapy when Pbrm1 was inactivated. In many human cancers, expression of PBRM1 and ARID2 inversely correlated with expression of T cell cytotoxicity genes, and Pbrm1-deficient murine melanomas were more strongly infiltrated by cytotoxic T cells.