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• W2891387143 startingPage "6594" @default.
• W2891387143 abstract ": Unresectable hepatic metastases of colon cancer respond poorly to existing therapies and are a major cause of colon cancer lethality. In this study, we evaluated the therapeutic viability of targeting the mediator kinase CDK8, an early clinical stage drug target, as a means to suppress metastasis of colon cancer. CDK8 was amplified or overexpressed in many colon cancers and CDK8 expression correlated with shorter patient survival. Knockdown or inhibition of CDK8 had little effect on colon cancer cell growth but suppressed metastatic growth of mouse and human colon cancer cells in the liver. This effect was due in part to inhibition of already established hepatic metastases, indicating therapeutic potential of CDK8 inhibitors in the metastatic setting. In contrast, knockdown or inhibition of CDK8 had no significant effect on the growth of tumors implanted subcutaneously, intrasplenically, or orthotopically in the cecum. CDK8 mediated colon cancer growth in the liver through downregulation of matrix metalloproteinase (MMP) inhibitor TIMP3 via TGFβ/SMAD-driven expression of a TIMP3-targeting microRNA, miR-181b, along with induction of Mmp3 in murine or MMP9 in human colon cancer cells via Wnt/β-catenin-driven transcription. These findings reveal a new mechanism for negative regulation of gene expression by CDK8 and a site-specific role for CDK8 in colon cancer hepatic metastasis. Our results indicate the utility of CDK8 inhibitors for the treatment of colon cancer metastases in the liver and suggest that CDK8 inhibitors may be considered in other therapeutic settings involving TGFβ/SMAD or Wnt/β-catenin pathway activation. SIGNIFICANCE: These findings demonstrate that inhibition of the transcription-regulating kinase CDK8 exerts a site-specific tumor-suppressive effect on colon cancer growth in the liver, representing a unique therapeutic opportunity for the treatment of advanced colon cancer.Graphical Abstract: http://cancerres.aacrjournals.org/content/canres/78/23/6594/F1.large.jpg." @default.
• W2891387143 created "2018-09-27" @default.
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• W2891387143 date "2018-12-01" @default.
• W2891387143 modified "2023-09-30" @default.
• W2891387143 title "CDK8 Selectively Promotes the Growth of Colon Cancer Metastases in the Liver by Regulating Gene Expression of TIMP3 and Matrix Metalloproteinases" @default.
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• W2891387143 doi "https://doi.org/10.1158/0008-5472.can-18-1583" @default.
• W2891387143 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6279600" @default.
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