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Investigational New Drugs

, Volume 33, Issue 5, pp 1123–1132 | Cite as

Evaluation of cytotoxic activity of titanocene difluorides and determination of their mechanism of action in ovarian cancer cells

  • Lucie Koubkova
  • Rostislav Vyzula
  • Jindrich Karban
  • Jiri Pinkas
  • Eva Ondrouskova
  • Borivoj Vojtesek
  • Roman HrstkaEmail author
SHORT REPORT

Summary

Background Ovarian cancer is the seventh-most common cancer amongst women and the most deadly gynecologic cancer. Cisplatin based drugs are used in first line therapy, but resistance represents a major obstacle for successful treatment. In this study, we investigated the anticancer effects and mechanism of action of three titanocene difluorides, two bearing a pendant carbohydrate moiety (α-d-ribofuranos-5-yl) on their periphery and one without any substitution. Results The efficacy of these compounds on ovarian cancer cell lines was evaluated in relation to their particular chemical structure and compared with cisplatin as the most common treatment modality for this type of cancer. The typical mechanism of cisplatin action involves DNA damage, activation of p53 protein and induction of cell death, as previously described for titanium ions. Nevertheless, our data indicate that the effect of titanocene difluoride derivatives is mediated via the endoplasmic reticulum stress pathway and autophagy. Conclusion We anticipate that the presence of substituents on cyclopentadienyl ring(s) might play an important role in modulation of the activity of particular compounds. Titanocene difluorides exert comparable cytotoxic activity as cisplatin and are more efficient in cisplatin-resistant cell lines. Our results suggest potential utilization of these compounds especially in the treatment of cisplatin-resistant tumor cells.

Keywords

Titanocene Cisplatin Ovarian cancer Cytotoxicity Organometallic compounds 

Notes

Acknowledgments

We would like to thank Dr. Philip J. Coates for critical reading of the manuscript. This work was supported by the project MEYS – NPS I – LO1413, MH CZ-DRO (MMCI, 00209805) and Czech Science Foundation projects P206/12/G151 and P207/12/2368.

Conflict of interest

The authors declare no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Lucie Koubkova
    • 1
  • Rostislav Vyzula
    • 1
  • Jindrich Karban
    • 3
  • Jiri Pinkas
    • 2
  • Eva Ondrouskova
    • 1
  • Borivoj Vojtesek
    • 1
  • Roman Hrstka
    • 1
    Email author
  1. 1.Regional Centre for Applied and Molecular OncologyMasaryk Memorial Cancer InstituteBrnoCzech Republic
  2. 2.J. Heyrovsky Institute of Physical ChemistryAcademy of Sciences of the Czech RepublicPrague 8Czech Republic
  3. 3.Institute of Chemical Process FundamentalsAcademy of Sciences of the Czech RepublicPrague 6Czech Republic

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