Abstract
Background
In ovarian cancer (OC) therapy, even initially responsive patients develop drug resistance.
Methods
Here, we present an OC cell model composed of variants with differing degrees of acquired resistance to carboplatin (CBP), cross-resistance to paclitaxel, and CBP-induced metastatic properties (migration and invasion). Transcriptome data were analysed by two approaches identifying differentially expressed genes and CBP sensitivity-correlating genes. The impact of selected genes and signalling pathways on drug resistance and metastatic potential, along with their clinical relevance, was examined by in vitro and in silico approaches.
Results
TMEM200A and PRKAR1B were recognised as potentially involved in both phenomena, also having high predictive and prognostic values for OC patients. CBP-resistant MES-OV CBP8 cells were more sensitive to PI3K/Akt/mTOR pathway inhibitors Rapamycin, Wortmannin, SB216763, and transcription inhibitor Triptolide compared with parental MES-OV cells. When combined with CBP, Rapamycin decreased the sensitivity of parental cells while Triptolide sensitised drug-resistant cells to CBP. Four PI3K/Akt/mTOR inhibitors reduced migration in both cell lines.
Conclusions
A newly established research model and two distinct transcriptome analysis approaches identified novel candidate genes enrolled in CBP resistance development and/or CBP-induced EMT and implied that one-gene targeting could be a better approach than signalling pathway inhibition for influencing both phenomena.
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Data availability
All data supporting the findings of this study are included within the article and its Supplementary Information files (and Reporting summary). Also, the data will be shared upon reasonable request to the corresponding author from colleagues who want to analyse in deep our findings.
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Acknowledgements
The authors would like to thank Professor Gerhard Fritz (University of Düsseldorf, Germany) and Professor Maja T. Tomicic (University Medical Center of the Johannes Gutenberg University of Mainz) for critical reading of the manuscript and helpful suggestions regarding its improvement and outlook, Graduate Engineer Marina Šutalo (Ruđer Bošković Institute, Croatia) for technical assistance, Mrs. Carla Edwards for language editing and members of the Centre for Information and Media Technology at Heinrich-Heine-University Düsseldorf who provided the computational infrastructure and support.
Funding
These materials are based on the work financed by the Croatian Science Foundation (CSF, project numbers IP-2016-06-1036 and DOK-2018-01-8086), COST Action 17104, and Croatian League against Cancer.
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AB and JK designed the study. JK, MPK, SD, DSP and TW performed the experiments. AB, JK and KK provided conceptual advice. JK and AB wrote the manuscript. AB secured the funding.
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Kralj, J., Pernar Kovač, M., Dabelić, S. et al. Transcriptome analysis of newly established carboplatin-resistant ovarian cancer cell model reveals genes shared by drug resistance and drug-induced EMT. Br J Cancer 128, 1344–1359 (2023). https://doi.org/10.1038/s41416-023-02140-1
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DOI: https://doi.org/10.1038/s41416-023-02140-1
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