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- W2892095406 abstract "e14085 Background: Cyclin dependent kinase 7 (CDK7) is an attractive target for cancer drugs due to its dual roles, cell cycle regulation and gene transcription/RNA procession. We synthesized UD-017, a small molecule, highly selective CDK7 inhibitor with a novel chemotype. In this study, we characterize antitumor activity of UD-017 in vitro and in vivo, and try to elucidate underlying mechanisms by which CDK7 inhibition contributes to the antitumor efficacy in colorectal cancer cells. Methods: We examined CDK7 selectivity of UD-017 against the other CDKs and kinases. We evaluated the antitumor activity in a variety of human cancer cell lines including colorectal cancer cells. We investigated the mechanism of antitumor activity of UD-017 using a human colorectal cancer cell line, HCT-116. In vivo antitumor efficacy of UD-017 was assessed in HCT-116 xenograft models and patient derived xenograft (PDX) model. Results:UD-017 inhibited CDK7 enzyme (IC 50 = 16 nM), which is at least 300-fold more selective against other CDKs. In a panel of 313 kinases assay, UD-017 inhibited CDK7 almost mono-specifically. UD-017 potently inhibited the growth of human cancer cells including the patient-derived colorectal cancer cells.In the mechanism study, UD-017 inhibited phosphorylation of CDK1, 2 and retinoblastoma, which was followed by cell-cycle arrest. Inhibition of both RNA polymerase II phosphorylation and c-Myc expression was observed followed by apoptosis induction. HCT-116 xenograft model and PDX model demonstrated the potent antitumor activity of UD-017 with dose-dependence by daily oral administration for 2 weeks. Furthermore, UD-017 showed the combination effect with 5-FU without further affecting the side effects of the chemotherapy. Conclusions:UD-017 is a potent and highly selective CDK7 inhibitor, and significantly inhibits the growth of human cancer cell lines with cell-cycle arrest and apoptosis induction. UD-017 showed potent and dose-dependent antitumor response in the HCT-116 xenograft model and PDX model. Further investigation towards clinical development is warranted." @default.
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- W2892095406 date "2017-05-20" @default.
- W2892095406 modified "2023-09-22" @default.
- W2892095406 title "Preclinical in vitro and in vivo evaluation of antitumor activity of UD-017, a novel selective and orally available CDK7 inhibitor, in colorectal cancer." @default.
- W2892095406 doi "https://doi.org/10.1200/jco.2017.35.15_suppl.e14085" @default.
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