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Molecular Cancer
Published in: Molecular Cancer 1/2015

Open Access 01-12-2015 | Research

miR-634 restores drug sensitivity in resistant ovarian cancer cells by targeting the Ras-MAPK pathway

Authors: Marijn T. M. van Jaarsveld, Patricia F. van Kuijk, Antonius W. M. Boersma, Jozien Helleman, Wilfred F. van IJcken, Ron H. J. Mathijssen, Joris Pothof, Els M. J. J. Berns, Jaap Verweij, Erik A. C. Wiemer

Published in: Molecular Cancer | Issue 1/2015

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Abstract

Background

Drug resistance hampers the efficient treatment of malignancies, including advanced stage ovarian cancer, which has a 5-year survival rate of only 30 %. The molecular processes underlying resistance have been extensively studied, however, not much is known about the involvement of microRNAs.

Methods

Differentially expressed microRNAs between cisplatin sensitive and resistant cancer cell line pairs were determined using microarrays. Mimics were used to study the role of microRNAs in drug sensitivity of ovarian cancer cell lines and patient derived tumor cells. Luciferase reporter constructs were used to establish regulation of target genes by microRNAs.

Results

MiR-634 downregulation was associated with cisplatin resistance. Overexpression of miR-634 affected cell cycle progression and enhanced apoptosis in ovarian cancer cells. miR-634 resensitized resistant ovarian cancer cell lines and patient derived drug resistant tumor cells to cisplatin. Similarly, miR-634 enhanced the response to carboplatin and doxorubicin, but not to paclitaxel. The cell cycle regulator CCND1, and Ras-MAPK pathway components GRB2, ERK2 and RSK2 were directly repressed by miR-634 overexpression. Repression of the Ras-MAPK pathway using a MEK inhibitor phenocopied the miR-634 effects on viability and chemosensitivity.

Conclusion

miR-634 levels determine chemosensitivity in ovarian cancer cells. We identify miR-634 as a therapeutic candidate to resensitize chemotherapy resistant ovarian tumors.
Appendix
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Metadata
Title
miR-634 restores drug sensitivity in resistant ovarian cancer cells by targeting the Ras-MAPK pathway
Authors
Marijn T. M. van Jaarsveld
Patricia F. van Kuijk
Antonius W. M. Boersma
Jozien Helleman
Wilfred F. van IJcken
Ron H. J. Mathijssen
Joris Pothof
Els M. J. J. Berns
Jaap Verweij
Erik A. C. Wiemer
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2015
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/s12943-015-0464-4

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