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Molecular Cancer Therapeutics
Molecular Cancer Therapeutics
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Article

Down-regulation of Notch-1 contributes to cell growth inhibition and apoptosis in pancreatic cancer cells

Zhiwei Wang, Yuxiang Zhang, Yiwei Li, Sanjeev Banerjee, Joshua Liao and Fazlul H. Sarkar
Zhiwei Wang
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Yuxiang Zhang
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Yiwei Li
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Sanjeev Banerjee
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Joshua Liao
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Fazlul H. Sarkar
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DOI: 10.1158/1535-7163.MCT-05-0299 Published March 2006
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This article has been retracted. Please see:

  • Retraction: Downregulation of Notch-1 Contributes to Cell Growth Inhibition and Apoptosis in Pancreatic Cancer Cells - October 1, 2018

Abstract

Pancreatic cancer remains the fourth most common cause of cancer-related death in the United States. Notch signaling plays a critical role in maintaining the balance among cell proliferation, differentiation, and apoptosis, and thereby may contribute to the development of pancreatic cancer. To characterize Notch pathway function in pancreatic cancer cells, we explored the consequences of down-regulation of Notch-1 in BxPC-3, HPAC, and PANC-1 pancreatic cancer cells. Using multiple cellular and molecular approaches such as 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay, apoptosis assay, flow cytometry, gene transfection, real-time reverse transcription-PCR (RT-PCR), Western blotting, and electrophoretic mobility shift assay for measuring DNA binding activity of nuclear factor κB (NF-κB), we found that down-regulation of Notch-1 inhibited cell growth and induced apoptosis in pancreatic cancer cells. Notch-1 down-regulation also increased cell population in the G0-G1 phase. Compared with control, small interfering RNA–transfected cells decreased expression of cyclin A, cyclin D1, and cyclin-dependent kinase 2. We found up-regulation of p21 and p27, which was correlated with the cell cycle changes. In addition, Notch-1 down-regulation also induced apoptosis, which could be due to decreased Bcl-2 and Bcl-XL protein expression in pancreatic cancer cells. Because Notch-1 is known to cross-talk with another major cell growth and apoptotic regulatory pathway (i.e., NF-κB), we found that NF-κB is a downstream target of Notch because down-regulation of Notch reduced NF-κB activity. We also found that genistein, a prominent isoflavone, could be an active agent for the down-regulation of the Notch pathway. These findings suggest that Notch-1 down-regulation, especially by genistein, could be a novel therapeutic approach for the treatment of pancreatic cancer. [Mol Cancer Ther 2006;5(3):483–93]

Keywords:
  • Notch-1 signaling pathway
  • genistein
  • NF-κB
  • cell cycle

Footnotes

  • Grant support: National Cancer Institute, NIH grant 5R01CA101870-02 and The University of Texas M.D. Anderson Cancer Center subcontract award (F.H. Sarkar) through Specialized Program of Research Excellence in Pancreatic Cancer grant 1P20-CA010193-01 (J. Abbruzzese).

  • The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

    • Accepted January 5, 2006.
    • Received August 3, 2005.
    • Revision received October 31, 2005.
  • American Association for Cancer Research
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Molecular Cancer Therapeutics: 5 (3)
March 2006
Volume 5, Issue 3
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Down-regulation of Notch-1 contributes to cell growth inhibition and apoptosis in pancreatic cancer cells
Zhiwei Wang, Yuxiang Zhang, Yiwei Li, Sanjeev Banerjee, Joshua Liao and Fazlul H. Sarkar
Mol Cancer Ther March 1 2006 (5) (3) 483-493; DOI: 10.1158/1535-7163.MCT-05-0299

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Down-regulation of Notch-1 contributes to cell growth inhibition and apoptosis in pancreatic cancer cells
Zhiwei Wang, Yuxiang Zhang, Yiwei Li, Sanjeev Banerjee, Joshua Liao and Fazlul H. Sarkar
Mol Cancer Ther March 1 2006 (5) (3) 483-493; DOI: 10.1158/1535-7163.MCT-05-0299
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Molecular Cancer Therapeutics
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