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International Journal of Oncology
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Article

Epigenetic silencing of ARNTL, a circadian gene and potential tumor suppressor in ovarian cancer

  • Authors:
    • Chia-Ming Yeh
    • Jacqueline Shay
    • Ting-Chuan Zeng
    • Jian-Liang Chou
    • Tim H.-M. Huang
    • Hung-Cheng Lai
    • Michael W.Y. Chan
  • View Affiliations / Copyright

    Affiliations: Department of Life Science and, National Chung Cheng University, Chia-Yi, Taiwan, R.O.C., Department of Molecular Medicine, Institute of Biotechnology, University of Texas Health Science Center, San Antonio, TX, USA, Department of Obstetrics and Gynecology, Tri-Service General Hospital, National Defense Medical Center, Taipei, R.O.C.
  • Pages: 2101-2107
    |
    Published online on: August 29, 2014
       https://doi.org/10.3892/ijo.2014.2627
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Abstract

Ovarian cancer is the fifth leading cause of cancer death and the most deadly gynecological malignancy in women. Epigenetic modifications play an important role in regulating gene transcription. Specifically, aberrant promoter hypermethylation has been implicated as a hallmark of cancer. In order to identify genes that are differentially methylated in ovarian cancer, we performed meDIP-chip in various ovarian cancer cell lines using Agilent 244K CpG island microarray. One of the targets, ARNTL which is a core component of the circadian clock is methylated in a sub-set of ovarian cancer cell lines. Combined bisulfite restriction analysis (COBRA) confirmed the results of the microarray. Additional analysis using ChIP-PCR revealed that promoter of ARNTL is enriched with the repressive histone mark H3K27me3 in CP70 and MCP2 ovarian cancer cells. Treatment with the EZH2 inhibitor (GSK126) significantly restored ARNTL expression in these cells (CP70 and MCP2). Further functional analysis demonstrated that overexpression of ARNTL inhibited cell growth and enhanced chemosensitivity of cisplatin in ovarian cancer cells. Finally, overexpression of ARNTL restored the rhythmic activity of c-MYC in ovarian cancer cells. These results suggested that ARNTL may be a tumor suppressor and is epigenetically silenced in ovarian cancer.
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Copy and paste a formatted citation
Spandidos Publications style
Yeh C, Shay J, Zeng T, Chou J, Huang TH, Lai H and Chan MW: Epigenetic silencing of ARNTL, a circadian gene and potential tumor suppressor in ovarian cancer. Int J Oncol 45: 2101-2107, 2014.
APA
Yeh, C., Shay, J., Zeng, T., Chou, J., Huang, T.H., Lai, H., & Chan, M.W. (2014). Epigenetic silencing of ARNTL, a circadian gene and potential tumor suppressor in ovarian cancer. International Journal of Oncology, 45, 2101-2107. https://doi.org/10.3892/ijo.2014.2627
MLA
Yeh, C., Shay, J., Zeng, T., Chou, J., Huang, T. H., Lai, H., Chan, M. W."Epigenetic silencing of ARNTL, a circadian gene and potential tumor suppressor in ovarian cancer". International Journal of Oncology 45.5 (2014): 2101-2107.
Chicago
Yeh, C., Shay, J., Zeng, T., Chou, J., Huang, T. H., Lai, H., Chan, M. W."Epigenetic silencing of ARNTL, a circadian gene and potential tumor suppressor in ovarian cancer". International Journal of Oncology 45, no. 5 (2014): 2101-2107. https://doi.org/10.3892/ijo.2014.2627
Copy and paste a formatted citation
x
Spandidos Publications style
Yeh C, Shay J, Zeng T, Chou J, Huang TH, Lai H and Chan MW: Epigenetic silencing of ARNTL, a circadian gene and potential tumor suppressor in ovarian cancer. Int J Oncol 45: 2101-2107, 2014.
APA
Yeh, C., Shay, J., Zeng, T., Chou, J., Huang, T.H., Lai, H., & Chan, M.W. (2014). Epigenetic silencing of ARNTL, a circadian gene and potential tumor suppressor in ovarian cancer. International Journal of Oncology, 45, 2101-2107. https://doi.org/10.3892/ijo.2014.2627
MLA
Yeh, C., Shay, J., Zeng, T., Chou, J., Huang, T. H., Lai, H., Chan, M. W."Epigenetic silencing of ARNTL, a circadian gene and potential tumor suppressor in ovarian cancer". International Journal of Oncology 45.5 (2014): 2101-2107.
Chicago
Yeh, C., Shay, J., Zeng, T., Chou, J., Huang, T. H., Lai, H., Chan, M. W."Epigenetic silencing of ARNTL, a circadian gene and potential tumor suppressor in ovarian cancer". International Journal of Oncology 45, no. 5 (2014): 2101-2107. https://doi.org/10.3892/ijo.2014.2627
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