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- W2561907664 abstract "Regorafenib, a multi-kinase inhibitor targeting the Ras/Raf/MEK/ERK pathway, has recently been approved for the treatment of metastatic colorectal cancer (CRC). However, the mechanisms of action of regorafenib in CRC cells have been unclear. We investigated how regorafenib suppresses CRC cell growth and potentiates effects of other chemotherapeutic drugs. We found that regorafenib treatment induces PUMA in CRC cells irrespective of p53 status through the NF-κB pathway following ERK inhibition and glycogen synthase kinase 3β (GSK3β) activation. Upregulation of PUMA is correlated with apoptosis induction in different CRC cell lines. PUMA is necessary for regorafenib-induced apoptosis in CRC cells. Chemosensitization by regorafenib is mediated by enhanced PUMA induction through different pathways. Furthermore, deficiency in PUMA abrogates the in vivo antitumor, antiangiogenic and chemosensitization effects of regorafenib. Our results demonstrate a key role of PUMA in mediating the anticancer effects of regorafenib in CRC cells. They suggest that PUMA induction can be used as an indicator of regorafenib sensitivity, and also provide a rationale for manipulating the apoptotic machinery to improve the therapeutic efficacy of regorafenib and other targeted drugs. Citation Format: Dongshi Chen, Liang Wei, Jian Yu, Lin Zhang. Regorafenib inhibits colorectal tumor growth through PUMA-mediated apoptosis. [abstract]. In: Proceedings of the 106th Annual Meeting of the American Association for Cancer Research; 2015 Apr 18-22; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Res 2015;75(15 Suppl):Abstract nr 667. doi:10.1158/1538-7445.AM2015-667" @default.
- W2561907664 created "2017-01-06" @default.
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- W2561907664 date "2015-08-01" @default.
- W2561907664 modified "2023-09-26" @default.
- W2561907664 title "Abstract 667: Regorafenib inhibits colorectal tumor growth through PUMA-mediated apoptosis" @default.
- W2561907664 doi "https://doi.org/10.1158/1538-7445.am2015-667" @default.
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