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Integrated Analyses Identify a Master MicroRNA Regulatory Network for the Mesenchymal Subtype in Serous Ovarian Cancer

by: Da Yang, Yan Sun, Limei Hu, Hong Zheng, Ping Ji, Chad V. Pecot, Yanrui Zhao, Sheila Reynolds, Hanyin Cheng, Rajesha Rupaimoole, David Cogdell, Matti Nykter, Russell Broaddus, Cristian Rodriguez-Aguayo, Gabriel Lopez-Berestein, Jinsong Liu, Ilya Shmulevich, Anil K. Sood, Kexin Chen, Wei Zhang
Cancer Cell, Vol. 23, No. 2. (11 February 2013), pp. 186-199, doi:10.1016/j.ccr.2012.12.020  Key: citeulike:12028326

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Abstract

Integrated genomic analyses revealed a miRNA-regulatory network that further defined a robust integrated mesenchymal subtype associated with poor overall survival in 459 cases of serous ovarian cancer (OvCa) from The Cancer Genome Atlas and 560 cases from independent cohorts. Eight key miRNAs, including miR-506, miR-141, and miR-200a, were predicted to regulate 89% of the targets in this network. Follow-up functional experiments illustrate that miR-506 augmented E-cadherin expression, inhibited cell migration and invasion, and prevented TGF²-induced epithelial-mesenchymal transition by targeting SNAI2, a transcriptional repressor of E-cadherin. In human OvCa, miR-506 expression was correlated with decreased SNAI2 and VIM, elevated E-cadherin, and beneficial prognosis. Nanoparticle delivery of miR-506 in orthotopic OvCa mouse models led to E-cadherin induction and reduced tumor growth. º Integrated analyses identify microRNA network regulating iM subtype º iM subtype is robustly associated with poor overall survival in serous OvCa º miR-506 is validated as an EMT inhibitor º miR-506 suppresses tumor growth in orthotopic mouse models of OvCa


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