Abstract
Purpose
Despite recent advances in chemotherapeutic agents for Hepatocellular carcinoma (HCC) treatment, the results of chemotherapy remain unsatisfactory. Doxorubicin (DOX) still represents the cornerstone in HCC chemotherapy, but resistance and toxicity to normal cells are major obstacles to successful chemotherapy. Therefore, new active agents in HCC chemotherapy and agents that increase the chemosensitivity of HCC cells to DOX are still urgently required. Nutlin-3 is a small-molecule inhibitor that acts to inhibit murine double minute-2 (MDM2) binding to p53 or p73, and subsequently activates p53- or p73-dependent apoptosis signaling pathway. This study was designed to investigate whether Nutlin-3 alters cell toxicity to HCC cells following DNA damage and to assess the suitability of DOX/Nutlin-3 as a chemotherapeutic combination in HCC chemotherapy.
Methods
Four human HCC cells were analyzed using cell proliferation assay, apoptosis assay, western blotting, co-immunoprecipitation and siRNA experiments. Anti-tumoral effects of Nutlin-3/DOX targeting the p53/MDM2 and p73/MDM2 pathways were evaluated in HCC cell lines.
Results
Nutlin-3 enhances the growth inhibition by DOX and potentates the apoptotic effect in all HCC cell lines with different p53 types. Nutlin-3 acts through the disruption of p53–MDM2 binding in HepG2, and the disruption of p73–MDM2 in Huh-7 and Hep3B cell lines with subsequent activation of the apoptotic pathway, which leads to the increase in chemosensitivity to DOX in HCC cells.
Conclusions
Taken together, our findings suggest that Nutlin-3 will be active in the treatment of HCC and offers new prospects for overcoming DOX resistance.
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Change history
02 February 2021
A Correction to this paper has been published: https://doi.org/10.1007/s00432-021-03543-4
Abbreviations
- HCC:
-
Hepatocellular carcinoma
- DOX:
-
Doxorubicin
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- MDM2:
-
Murine double minute-2
- PBS:
-
Phospho-buffered saline
- siRNA:
-
Small interfering RNA
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The authors thank Dr. Nishant Bhatta for reviewing the manuscript.
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T. Zheng and J. Wang contributed equally to this work.
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Zheng, T., Wang, J., Song, X. et al. Nutlin-3 cooperates with doxorubicin to induce apoptosis of human hepatocellular carcinoma cells through p53 or p73 signaling pathways. J Cancer Res Clin Oncol 136, 1597–1604 (2010). https://doi.org/10.1007/s00432-010-0817-8
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DOI: https://doi.org/10.1007/s00432-010-0817-8