Ovarian cancer is the most lethal gynecological malignancy due to the silent nature on its early onset and the rapid acquisition of drug resistance. Histologically heterogeneous, it includes several subtypes with different mutational landscapes, hampering the development of effective targeted therapies. Non-coding RNAs are emerging as potential new therapeutic targets in cancer. To search for a microRNA signature related to ovarian carcinomas and study its potential as effective targeted therapy, we examined the expression of 768 miRNA in a large collection of tumor samples and found miR-654-5p to be infraexpressed in ovarian serous carcinomas, the most common and aggressive type. Restoration of miR-654-5p levels reduced tumor cell viability in vitro and in vivo and impaired sphere formation capacity and viability of ovarian cancer patient-derived ascitic cells ex vivo. CDCP1 and PLAGL2 oncogenes were found to be the most relevant direct miR-654-5p targets and both genes convey in a molecular signature associated with key cancer pathways relevant to ovarian tumorigenesis, such as MYC, WNT and AKT pathways. Together, we unveiled the tumor suppressor function of miR-654-5p, suggesting that its restoration or co-targeting of CDCP1 and PLAGL2 may be an effective therapeutic approach for ovarian cancer.
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We are thankful to Drs. Diego Arango and Agueda Martinez, Dr. Sung Goo Park and Dr. Rosanna Paciucci for 9E10 c-Myc, anti-HAX1 and anti-RB and anti-p-RB antibodies, respectively. We thank Dr. Francesc Viñals, Dr. Barbara Vanderhyden, Dr. Antonio Rosato, Dr. Erich A. Nigg and the Ovarian Cancer Research Team for cell lines. We are grateful to Drs. Aroa Soriano and Luz Jubierre for experimental help. We acknowledge technical support from the Flow Cytometry Facility at Center of Genomic Regulation (CRG) and the Unitat d’Estadística i Bioinformàtica (UEB) and the Unitat d’Alta Tecnologia (UAT) at VHIR. We thank all our lab members for support and helpful discussions. This work was supported in part by grants from Instituto de la Mujer Dexeus (DEXEUS-B29/012), CIBER (CB16/12/00328), SGR (2017 SGR 1661), the Ministerio de Economia y Competitividad and Fondos FEDER (RTC-2015-3821-1), Instituto Carlos III (PI15/00238 to A.S. and PI17/00564 to M.F.S) and the Miguel Servet Program (CP13/00158 and CPII18/00027 to AS. and CPII16/00006 to MFS). AP and LS were supported by predoctoral VHIR fellowships and CJ by an AGAUR predoctoral fellowship (VHIR: PRED-VHIR-2014-11 and PRED-VHIR-2017; AGAUR: 2017FI_B_00095, respectively).
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Majem, B., Parrilla, A., Jiménez, C. et al. MicroRNA-654-5p suppresses ovarian cancer development impacting on MYC, WNT and AKT pathways. Oncogene 38, 6035–6050 (2019). https://doi.org/10.1038/s41388-019-0860-0
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