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- W2956142912 abstract "Abstract Colorectal cancer (CRC) is one of the leading cause of cancer-related deaths Worldwide. In Saudi Arabia, CRC is more aggressive and presents at younger age, warranting new treatment strategies. Role of TGFβ/Smad4 signaling pathway in initiation and progression of CRC is well documented. Current study examined the role of TGFβ/Smad4 signaling pathway in a large cohort of Saudi CRC, followed by in vitro analysis to dissect the dual role of TGFβ on inducing epithelial to mesenchymal transition (EMT) and apoptosis. In this study, we investigated Smad4 alterations and their association with clinicopathological outcomes in a large cohort of CRC samples using targeted capture sequencing, Fluorescent in-situ hybridisation and immunohistochemistry. Our study demonstrated high frequency of Smad4 alterations with low expression of Smad4 protein identifying a sub-group of aggressive CRC to be an independent marker for poor prognosis. Functional studies using CRC cells show that TGFβ induces Smad4 dependent EMT followed by apoptosis. Induction of mesenchymal transcriptional factors, Snail1 and Zeb1 was essential for TGFβ-induced apoptosis. Our results indicate that KLF5 acts as an oncogene in CRC cells regardless of Smad4 expression and inhibition of KLF5 is requisite for TGFβ-induced apoptosis. Furthermore, TGFβ/Smad4 signal inhibits the transcription of KLF5 that in turn switches Sox4 from tumor promoter to suppressor. A high incidence of Smad4 alterations were found in the Saudi CRC patients. Functional study results indicate that TGFβ induces Smad4 dependent EMT followed by apoptosis in CRC cells. Citation Format: Pratheeshkumar Poyil, Abdul K. Siraj, Divya Sasidharan Padmaja, Sandeep Kumar Parvathareddy, Rong Bu, Tariq Masoodi, Yan Kong, Saravanan Thangavel, Saeeda Omer Ahmed, Nasser Al-Sanea, Luai H. Ashari, Alaa Abduljabbar, Samar Alhomoud, Fouad Al-Dayel, Khawla S. Al-Kuraya. TGFβ induced SMAD4 dependent apoptosis proceeded by EMT in colorectal cancer [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 4286." @default.
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- W2956142912 date "2019-07-01" @default.
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- W2956142912 title "Abstract 4286: TGFβ induced SMAD4 dependent apoptosis proceeded by EMT in colorectal cancer" @default.
- W2956142912 doi "https://doi.org/10.1158/1538-7445.am2019-4286" @default.
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