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

Molecular Cancer

Research

Joris Pothof¹  Antonius W. M. Boersma²  Patricia F. van Kuijk²  Erik A. C. Wiemer²  Jozien Helleman²  Ron H. J. Mathijssen²  Jaap Verweij²  Els M. J. J. Berns²  Marijn T. M. van Jaarsveld³  Wilfred F. van IJcken⁴ 

[1] Department of Genetics, Erasmus University Medical Center, 3015 CN, Rotterdam, The Netherlands;Department of Medical Oncology, Erasmus MC Cancer Institute, Erasmus University Medical Center Rotterdam, 3015 CN, Wytemaweg 80, Rotterdam, The Netherlands;Department of Medical Oncology, Erasmus MC Cancer Institute, Erasmus University Medical Center Rotterdam, 3015 CN, Wytemaweg 80, Rotterdam, The Netherlands;Present address: Max Planck Institute for Molecular Genetics, Berlin, Germany;Erasmus Center for Biomics, Erasmus University Medical Center, 3015 CN, Rotterdam, The Netherlands;

关键词: microRNA;    miRNA;    Drug resistance;    miR-634;    Ras-MAPK pathway;    Ovarian cancer;    Chemotherapy;    Cisplatin;    RPS6KA3;    RSK2;   

DOI  :  10.1186/s12943-015-0464-4

 received in 2015-04-13, accepted in 2015-10-28,  发布年份 2015

来源: Springer

【 摘 要 】

BackgroundDrug 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.MethodsDifferentially 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.ResultsMiR-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.ConclusionmiR-634 levels determine chemosensitivity in ovarian cancer cells. We identify miR-634 as a therapeutic candidate to resensitize chemotherapy resistant ovarian tumors.

【 授权许可】

CC BY   
© van Jaarsveld et al. 2015