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Article

E2F1 downregulation by arsenic trioxide in lung adenocarcinoma

  • Authors:
    • Sze-Kwan Lam
    • Yuan-Yuan Li
    • Chun-Yan Zheng
    • Leanne Lee Leung
    • James Chung-Man Ho
  • View Affiliations / Copyright

    Affiliations: Division of Respiratory Medicine, Department of Medicine, The University of Hong Kong, Queen Mary Hospital, Hong Kong, SAR, P.R. China
  • Pages: 2033-2043
    |
    Published online on: August 19, 2014
       https://doi.org/10.3892/ijo.2014.2609
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Abstract

Lung cancer is one of the most common cancers worldwide. Arsenic trioxide (ATO) has been approved by the US Food and Drug Administration for the treatment of acute promyelocytic leukemia. Nonetheless preliminary data have suggested potential activity of ATO in solid tumors including lung cancer. This study aimed to examine the underlying mechanisms of ATO in the treatment of lung adenocarcinoma. Using a panel of 7 lung adenocarcinoma cell lines, the effects of ATO treatment on cell viability, expression of E2F1 and its downstream targets, phosphatidylserine externalization, mitochondrial membrane depolarization and alteration of apoptotic/anti-apoptotic factors were studied. Tumor growth inhibition in vivo was investigated using a nude mouse xenograft model. ATO decreased cell viability with clinically achievable concentrations (8 µM) in all cell lines investigated. This was accompanied by reduced expression of E2F1, cyclin A2, skp2, c-myc, thymidine kinase and ribonucleotide reductase M1, while p-c-Jun was upregulated. Cell viability was significantly decreased with E2F1 knockdown. Treatment with ATO resulted in phosphatidylserine externalization in H23 cells and mitochondrial membrane depolarization in all cell lines, associated with truncation of Bid, downregulation of Bcl-2, upregulation of Bax and Bak, caspase-9 and -3 activation and PARP cleavage. Using the H358 xenograft model, the tumor growth was suppressed in the ATO treatment group during 8 days of treatment, associated with downregulation of E2F1 and upregulation of truncated Bid and cleaved caspase-3. In conclusion, ATO has potent in vitro and in vivo activity in lung adenocarcinoma, partially mediated through E2F1 downregulation and apoptosis.
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Copy and paste a formatted citation
Spandidos Publications style
Lam S, Li Y, Zheng C, Leung LL and Ho JC: E2F1 downregulation by arsenic trioxide in lung adenocarcinoma. Int J Oncol 45: 2033-2043, 2014.
APA
Lam, S., Li, Y., Zheng, C., Leung, L.L., & Ho, J.C. (2014). E2F1 downregulation by arsenic trioxide in lung adenocarcinoma. International Journal of Oncology, 45, 2033-2043. https://doi.org/10.3892/ijo.2014.2609
MLA
Lam, S., Li, Y., Zheng, C., Leung, L. L., Ho, J. C."E2F1 downregulation by arsenic trioxide in lung adenocarcinoma". International Journal of Oncology 45.5 (2014): 2033-2043.
Chicago
Lam, S., Li, Y., Zheng, C., Leung, L. L., Ho, J. C."E2F1 downregulation by arsenic trioxide in lung adenocarcinoma". International Journal of Oncology 45, no. 5 (2014): 2033-2043. https://doi.org/10.3892/ijo.2014.2609
Copy and paste a formatted citation
x
Spandidos Publications style
Lam S, Li Y, Zheng C, Leung LL and Ho JC: E2F1 downregulation by arsenic trioxide in lung adenocarcinoma. Int J Oncol 45: 2033-2043, 2014.
APA
Lam, S., Li, Y., Zheng, C., Leung, L.L., & Ho, J.C. (2014). E2F1 downregulation by arsenic trioxide in lung adenocarcinoma. International Journal of Oncology, 45, 2033-2043. https://doi.org/10.3892/ijo.2014.2609
MLA
Lam, S., Li, Y., Zheng, C., Leung, L. L., Ho, J. C."E2F1 downregulation by arsenic trioxide in lung adenocarcinoma". International Journal of Oncology 45.5 (2014): 2033-2043.
Chicago
Lam, S., Li, Y., Zheng, C., Leung, L. L., Ho, J. C."E2F1 downregulation by arsenic trioxide in lung adenocarcinoma". International Journal of Oncology 45, no. 5 (2014): 2033-2043. https://doi.org/10.3892/ijo.2014.2609
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