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Learn MoreThe serrated adenocarcinoma subtype accounts for 15-30% of all colorectal cancers (CRCs) and is aggressive and treatment-resistant. it is an alternative mechanism for CRC development characterized by dysregulation of the MAPK pathway. We show that human serrated tumors display reduced expression of PKCz and PKCl/i, and that the simultaneous inactivation of these genes in the mouse intestinal epithelium resulted in spontaneous tumorigenesis through the serrated pathway that progressed to advanced cancer. Whereas epithelial PKCl/i deficiency led to immunogenic cell death that repressed tumor initiation, interferon and CD8+ T cell responses were impaired concomitant with stromal activation and immunosuppression driven by PKCz loss. Thus, PKCz and PKCl/i cooperatively suppress serrated tumorigenesis. Targeting this stromal activation and immunosuppression showed synergistic curative activity. SOURCE: Jorge Moscat (jmoscat@sanfordburnham.org) - Sanford-Burnham Medical Research Institute
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