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April-2015 Volume 33 Issue 4

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Article

Violacein anticancer activity is enhanced under hypoxia

  • Authors:
    • Saeed M. Hashimi
    • Tiefeng Xu
    • Ming Q. Wei
  • View Affiliations / Copyright

    Affiliations: Division of Molecular and Gene Therapies, Griffith Health Institute, School of Medical Science, Griffith University, Gold Coast, Qld 4215, Australia, Cancer Institute of Hainan Medical College, Affiliated Hospital of Hainan Medical College, Haikou, Hainan 570102, P.R. China
  • Pages: 1731-1736
    |
    Published online on: February 4, 2015
       https://doi.org/10.3892/or.2015.3781
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Abstract

Current cancer treatments of solid tumours such as chemotherapy and radiotherapy, have yet to produce effective therapeutic results due to non-specific targeting. This has led to many complications, such as toxicities in cancer patients. The ability of natural compounds in inducing programmed cell death (apoptosis), a process dysregulated in cancer cells, has been extensively studied in recent studies. This study assessed the anti-proliferative activity of violacein in a number of human cancer cell lines under normal and hypoxic conditions. Furthermore, we investigated its effects in a tumour‑bearing subcutaneous mouse model. We also examined the ability of a tumour‑targeting Salmonella strain to produce violacein for local delivery within the tumour microenvironment. The results showed that hypoxia significantly increased the cytotoxic effects of violacein. The most significant reduction in the IC50 was in the HT29 (12.6-fold) and HCT116 (4.8-fold) colon cancer cell lines, HN5 head and neck squamous carcinoma cell line (6.5-fold), and MCF-7 breast ductal carcinoma cell line (4-fold). Among the cell lines tested for active caspase-3/7 activity, violacein only increased caspase-3/7 activity in the A549 non-small lung cancer cell line. In vivo efficacy of violacein showed that HN5 tumour‑bearing mice had regressed tumours during the treatment period and survival increased. The results also showed that transfer of the violacein biosynthetic cluster into the oncolytic strain VNP20009 of Salmonella resulted in the production of active violacein, suggesting targeted delivery of violacein by VNP20009. Taken together, our study has shown that hypoxia synergises the effects of violacein and the results from the in vivo administration of violacein require further investigation of violacein as an anticancer chemotherapeutic.
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Copy and paste a formatted citation
Spandidos Publications style
Hashimi SM, Xu T and Wei MQ: Violacein anticancer activity is enhanced under hypoxia. Oncol Rep 33: 1731-1736, 2015.
APA
Hashimi, S.M., Xu, T., & Wei, M.Q. (2015). Violacein anticancer activity is enhanced under hypoxia. Oncology Reports, 33, 1731-1736. https://doi.org/10.3892/or.2015.3781
MLA
Hashimi, S. M., Xu, T., Wei, M. Q."Violacein anticancer activity is enhanced under hypoxia". Oncology Reports 33.4 (2015): 1731-1736.
Chicago
Hashimi, S. M., Xu, T., Wei, M. Q."Violacein anticancer activity is enhanced under hypoxia". Oncology Reports 33, no. 4 (2015): 1731-1736. https://doi.org/10.3892/or.2015.3781
Copy and paste a formatted citation
x
Spandidos Publications style
Hashimi SM, Xu T and Wei MQ: Violacein anticancer activity is enhanced under hypoxia. Oncol Rep 33: 1731-1736, 2015.
APA
Hashimi, S.M., Xu, T., & Wei, M.Q. (2015). Violacein anticancer activity is enhanced under hypoxia. Oncology Reports, 33, 1731-1736. https://doi.org/10.3892/or.2015.3781
MLA
Hashimi, S. M., Xu, T., Wei, M. Q."Violacein anticancer activity is enhanced under hypoxia". Oncology Reports 33.4 (2015): 1731-1736.
Chicago
Hashimi, S. M., Xu, T., Wei, M. Q."Violacein anticancer activity is enhanced under hypoxia". Oncology Reports 33, no. 4 (2015): 1731-1736. https://doi.org/10.3892/or.2015.3781
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