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Apoptosis

pp 1–11 | Cite as

Cellular responses of BRCA1-defective HCC1937 breast cancer cells induced by the antimetastasis ruthenium(II) arene compound RAPTA-T

  • Tidarat Nhukeaw
  • Khwanjira Hongthong
  • Paul J. Dyson
  • Adisorn RatanaphanEmail author
Article
  • 132 Downloads

Abstract

An organometallic ruthenium(II) arene compound, Ru(η6-toluene)(PTA)Cl2 (PTA = 1,3,5-triaza-7-phosphaadamantane), termed RAPTA-T, exerts promising antimetastatic properties. In this study, the effects of RAPTA-T on BRCA1-defective HCC1937 breast cancer cells have been investigated, and compared to its effects on BRCA1-competent MCF-7 breast cancer cells. RAPTA-T showed a very low cytotoxicity against both tested cells. Ruthenium is found mostly in the cytoplasmic compartment of both cells. Flow cytometric analysis reveals that the compound arrests the growth of both cells by triggering the G2/M phase that led to the induction of apoptosis. At equimolar concentrations, RAPTA-T causes much more cellular BRCA1 damage in HCC1937 than in MCF-7 cells, suppressing the expression of BRCA1 mRNA in both cell lines with the subsequent down-regulation of the BRCA1 protein. Interestingly, RAPTA-T exhibits an approximately fivefold greater ability to suppress the expression of the BRCA1 protein in HCC1937 than in MCF-7 cells. These data provide insights into the molecular mechanisms by which RAPTA-T exerts its effects on BRCA1-associated breast cancer cells.

Keywords

Ruthenium complexes BRCA1 Breast cancer Cell cycle Apoptosis BRCA1 expression 

Notes

Acknowledgements

This research work was supported by the National Research Council of Thailand (PHA610093S and PHA590396S), Prince of Songkla University (PHA6202079S), and the Graduate school, Prince of Songkla University. We would like to thank the Pharmaceutical Laboratory Service Center and Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Prince of Songkla University for providing research facilities.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Human and animal rights

The article does not contain any studies with human participants or animals performed by any of the authors.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Laboratory of Pharmaceutical Biotechnology, Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical SciencesPrince of Songkla UniversitySongkhlaThailand
  2. 2.Institute of Chemical Sciences and EngineeringSwiss Federal Institute of Technology Lausanne (EPFL)LausanneSwitzerland

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