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Article

Piperlongumine exerts cytotoxic effects against cancer cells with mutant p53 proteins at least in part by restoring the biological functions of the tumor suppressor

  • Authors:
    • Debasish Basak
    • Surendra R. Punganuru
    • Kalkunte S. Srivenugopal
  • View Affiliations / Copyright

    Affiliations: Department of Biomedical Sciences and Cancer Biology Center, School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, TX 79106, USA
  • Pages: 1426-1436
    |
    Published online on: February 3, 2016
       https://doi.org/10.3892/ijo.2016.3372
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Abstract

Piperlongumine (PL), a small molecule alkaloid present in black pepper (Piper longum), has been reported to kill tumor cells irrespective of their p53 gene status, however, the mechanisms involved are unknown. Since p53 is a redox-sensitive protein, we hypothesized that the redox imbalance induced by PL may affect the structure and/or function of the mutant p53 protein and promote cell death. We used two human colon cancer cell lines, the HT29 and SW620 which harbor the R273H DNA contact abrogatory mutation in p53. PL treatment induced significant ROS production and protein glutathionylation with a concomitant increase in Nrf-2 expression in both cell lines. Surprisingly, immunoprecipitation with wt-p53 specific antibodies (PAb1620) or direct western blotting showed a progressive generation of wild-type-like p53 protein along with a loss of its mutant counterpart in PL-treated HT29 and SW620 cells. Moreover, the EMSA and DNA-affinity blotting revealed a time-dependent restoration of DNA-binding for the mutant p53, which was accompanied by the induction of p53 target genes, MDM2 and Bax. PL, while cytotoxic by itself, also increased the cell killing by many anticancer drugs. In nude mice bearing the HT29 tumors, PL alone (7.5 mg/kg daily) produced a 40% decrease in tumor volume, which was accompanied by diminished intratumoral mutant p53 protein levels. The antitumor efficacy of BCNU or doxorubicin in HT29 xenografts was highly potentiated by PL, followed by expression of apoptotic proteins. These clinically-relevant findings suggest that PL-induced oxidative milieu facilitates a weak functional restoration of mutant p53 through protein glutathionylation and contributes to the increased drug sensitivity.
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Copy and paste a formatted citation
Spandidos Publications style
Basak D, Punganuru SR and Srivenugopal KS: Piperlongumine exerts cytotoxic effects against cancer cells with mutant p53 proteins at least in part by restoring the biological functions of the tumor suppressor. Int J Oncol 48: 1426-1436, 2016.
APA
Basak, D., Punganuru, S.R., & Srivenugopal, K.S. (2016). Piperlongumine exerts cytotoxic effects against cancer cells with mutant p53 proteins at least in part by restoring the biological functions of the tumor suppressor. International Journal of Oncology, 48, 1426-1436. https://doi.org/10.3892/ijo.2016.3372
MLA
Basak, D., Punganuru, S. R., Srivenugopal, K. S."Piperlongumine exerts cytotoxic effects against cancer cells with mutant p53 proteins at least in part by restoring the biological functions of the tumor suppressor". International Journal of Oncology 48.4 (2016): 1426-1436.
Chicago
Basak, D., Punganuru, S. R., Srivenugopal, K. S."Piperlongumine exerts cytotoxic effects against cancer cells with mutant p53 proteins at least in part by restoring the biological functions of the tumor suppressor". International Journal of Oncology 48, no. 4 (2016): 1426-1436. https://doi.org/10.3892/ijo.2016.3372
Copy and paste a formatted citation
x
Spandidos Publications style
Basak D, Punganuru SR and Srivenugopal KS: Piperlongumine exerts cytotoxic effects against cancer cells with mutant p53 proteins at least in part by restoring the biological functions of the tumor suppressor. Int J Oncol 48: 1426-1436, 2016.
APA
Basak, D., Punganuru, S.R., & Srivenugopal, K.S. (2016). Piperlongumine exerts cytotoxic effects against cancer cells with mutant p53 proteins at least in part by restoring the biological functions of the tumor suppressor. International Journal of Oncology, 48, 1426-1436. https://doi.org/10.3892/ijo.2016.3372
MLA
Basak, D., Punganuru, S. R., Srivenugopal, K. S."Piperlongumine exerts cytotoxic effects against cancer cells with mutant p53 proteins at least in part by restoring the biological functions of the tumor suppressor". International Journal of Oncology 48.4 (2016): 1426-1436.
Chicago
Basak, D., Punganuru, S. R., Srivenugopal, K. S."Piperlongumine exerts cytotoxic effects against cancer cells with mutant p53 proteins at least in part by restoring the biological functions of the tumor suppressor". International Journal of Oncology 48, no. 4 (2016): 1426-1436. https://doi.org/10.3892/ijo.2016.3372
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