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Combination of etoposide and fisetin results in anti-cancer efficiency against osteosarcoma cell models

Abstract

Osteosarcoma chemotherapy is often limited by chemoresistance, resulting in poor prognosis. Combined chemotherapy could, therefore, be used to prevent resistance to chemotherapeutics. Here, the effects of fisetin on osteosarcoma cells were investigated, as well as cytostatic potential in combination with the anti-cancer drug etoposide. For this, different osteosarcoma cell lines were treated with fisetin, with etoposide and with respective combinations. Fisetin was associated with decrease in colony formation in Saos-2 and in U2OS cells but not in MG-63 cells. Notwithstanding, upon evaluation of cellular growth by crystal violet assay, MG-63 and Saos-2 cells showed decreased cell proliferation at 40 and 20 µM fisetin, respectively. Depending on the relative concentrations, fisetin:etoposide combinations showed negative-to-positive interactions on the inhibition of cell proliferation. In addition, fisetin treatment up to 50 µM for 48 h resulted in G2-phase cell cycle arrest. Regardless of the combination, fisetin:etoposide increased % cells in G2-phase and decreased % cells in G1-phase. In addition, mixtures with more positive combined effects induced increased % cells in S-phase. Compared to etoposide treatment, these combinations resulted in decreased levels of cyclins B1 and E1, pointing to the role of these regulators in fisetin-induced cell cycle arrest. In conclusion, these results show that the combination of fisetin with etoposide has higher anti-proliferative effects in osteosarcoma associated with cell cycle arrest, allowing the use of lower doses of the chemotherapeutic agent, which has important implications for osteosarcoma treatment.

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Acknowledgements

This work was supported by Grants from the Portuguese Foundation for Science and Technology—Fundação para a Ciência e a Tecnologia (SFRH/BPD/74868/2010 to J.M.P.F.O, SFRH/BPD/111736/2015 to H.O.).

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Correspondence to Conceição Santos.

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The manuscript does not contain clinical studies or patient data.

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The authors declare that they have no conflict of interest.

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Ferreira de Oliveira, J.M.P., Pacheco, A.R., Coutinho, L. et al. Combination of etoposide and fisetin results in anti-cancer efficiency against osteosarcoma cell models. Arch Toxicol 92, 1205–1214 (2018). https://doi.org/10.1007/s00204-017-2146-z

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Keywords

  • Osteosarcoma
  • P53
  • Combination therapy
  • Fisetin
  • Etoposide
  • Cell cycle regulators
  • MG-63 cells
  • Saos-2 cells