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Article

Smad4 sensitizes colorectal cancer to 5-fluorouracil through cell cycle arrest by inhibiting the PI3K/Akt/CDC2/survivin cascade

  • Authors:
    • Binhao Zhang
    • Chao Leng
    • Chao Wu
    • Zhanguo Zhang
    • Lei Dou
    • Xin Luo
    • Bixiang Zhang
    • Xiaoping Chen
  • View Affiliations / Copyright

    Affiliations: Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
  • Pages: 1807-1815
    |
    Published online on: December 8, 2015
       https://doi.org/10.3892/or.2015.4479
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Abstract

5-Fluorouracil (5-FU), a cell cycle-specific antimetabolite, is one of the most commonly used chemotherapeutic agents for colorectal cancer (CRC). Yet, resistance to 5-FU-based chemotherapy is still an obstacle to the treatment of this malignancy. Mutation or loss of Smad4 in CRC is pivotal for chemoresistance. However, the mechanism by which Smad4 regulates the chemosensitivity of CRC remains unclear. In the present study, we investigated the role of Smad4 in the chemosensitivity of CRC to 5-FU, and whether Smad4-regulated cell cycle arrest is involved in 5-FU chemoresistance. We used Smad4-expressing CT26 and Smad4-null SW620 cell lines as experimental models, by knockdown or transgenic overexpression. Cells or tumors were treated with 5-FU to determine chemosensitivity by cell growth, tumorigenicity assay and a mouse model. Cell cycle distribution was examined with flow cytometric analysis, and cell cycle-related proteins were examined by western blotting. Smad4 deficiency in CT26 and SW620 cells induced chemoresistance to 5-FU both in vitro and in vivo. Smad4 deficiency attenuated G1 or G2 cell cycle arrest by activating the PI3K/Akt/CDC2/survivin pathway. The PI3K inhibitor, LY294002, reversed the activation of the Akt/CDC2/survivin cascade in the Smad4-deficient cells, while it had little effect on cells with high Smad4 expression. In conclusion, we discovered a novel mechanism mediated by Smad4 to trigger 5-FU chemosensitivity through cell cycle arrest by inhibiting the PI3K/Akt/CDC2/survivin cascade. The present study also implies that LY294002 has potential therapeutic value to reverse the chemosensitivity of CRC with low Smad4 expression.
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Copy and paste a formatted citation
Spandidos Publications style
Zhang B, Leng C, Wu C, Zhang Z, Dou L, Luo X, Zhang B and Chen X: Smad4 sensitizes colorectal cancer to 5-fluorouracil through cell cycle arrest by inhibiting the PI3K/Akt/CDC2/survivin cascade. Oncol Rep 35: 1807-1815, 2016.
APA
Zhang, B., Leng, C., Wu, C., Zhang, Z., Dou, L., Luo, X. ... Chen, X. (2016). Smad4 sensitizes colorectal cancer to 5-fluorouracil through cell cycle arrest by inhibiting the PI3K/Akt/CDC2/survivin cascade. Oncology Reports, 35, 1807-1815. https://doi.org/10.3892/or.2015.4479
MLA
Zhang, B., Leng, C., Wu, C., Zhang, Z., Dou, L., Luo, X., Zhang, B., Chen, X."Smad4 sensitizes colorectal cancer to 5-fluorouracil through cell cycle arrest by inhibiting the PI3K/Akt/CDC2/survivin cascade". Oncology Reports 35.3 (2016): 1807-1815.
Chicago
Zhang, B., Leng, C., Wu, C., Zhang, Z., Dou, L., Luo, X., Zhang, B., Chen, X."Smad4 sensitizes colorectal cancer to 5-fluorouracil through cell cycle arrest by inhibiting the PI3K/Akt/CDC2/survivin cascade". Oncology Reports 35, no. 3 (2016): 1807-1815. https://doi.org/10.3892/or.2015.4479
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang B, Leng C, Wu C, Zhang Z, Dou L, Luo X, Zhang B and Chen X: Smad4 sensitizes colorectal cancer to 5-fluorouracil through cell cycle arrest by inhibiting the PI3K/Akt/CDC2/survivin cascade. Oncol Rep 35: 1807-1815, 2016.
APA
Zhang, B., Leng, C., Wu, C., Zhang, Z., Dou, L., Luo, X. ... Chen, X. (2016). Smad4 sensitizes colorectal cancer to 5-fluorouracil through cell cycle arrest by inhibiting the PI3K/Akt/CDC2/survivin cascade. Oncology Reports, 35, 1807-1815. https://doi.org/10.3892/or.2015.4479
MLA
Zhang, B., Leng, C., Wu, C., Zhang, Z., Dou, L., Luo, X., Zhang, B., Chen, X."Smad4 sensitizes colorectal cancer to 5-fluorouracil through cell cycle arrest by inhibiting the PI3K/Akt/CDC2/survivin cascade". Oncology Reports 35.3 (2016): 1807-1815.
Chicago
Zhang, B., Leng, C., Wu, C., Zhang, Z., Dou, L., Luo, X., Zhang, B., Chen, X."Smad4 sensitizes colorectal cancer to 5-fluorouracil through cell cycle arrest by inhibiting the PI3K/Akt/CDC2/survivin cascade". Oncology Reports 35, no. 3 (2016): 1807-1815. https://doi.org/10.3892/or.2015.4479
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