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Cancer Research 67, 8699, September 15, 2007. doi: 10.1158/0008-5472.CAN-07-1936
© 2007 American Association for Cancer Research
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Cell, Tumor, and Stem Cell Biology

MicroRNA Signatures in Human Ovarian Cancer

Marilena V. Iorio1, Rosa Visone2, Gianpiero Di Leva2, Valentina Donati2, Fabio Petrocca2, Patrizia Casalini1, Cristian Taccioli2, Stefano Volinia2, Chang-Gong Liu2, Hansjuerg Alder2, George A. Calin2, Sylvie Ménard1 and Carlo M. Croce2

1 Molecular Biology Unit, Department of Experimental Oncology, Fondazione Istituti di Ricovero e Cura a Carattere Scientifico, Istituto Nazionale Tumori, Milano, Italy and 2 Department of Molecular Virology, Immunology and Medical Genetics and Comprehensive Cancer Center, Ohio State University, Columbus, Ohio

Requests for reprints: Carlo M. Croce, Department of Molecular Virology, Immunology and Medical Genetics and Comprehensive Cancer Center, Ohio State University, Room 445C, Wiseman Hall, 400 12th Avenue, Columbus, OH 43210. Phone: 614-292-3063; Fax: 614-292-3312; E-mail: Carlo.Croce{at}osumc.edu.

Epithelial ovarian cancer (EOC) is the sixth most common cancer in women worldwide and, despite advances in detection and therapies, it still represents the most lethal gynecologic malignancy in the industrialized countries. Unfortunately, still relatively little is known about the molecular events that lead to the development of this highly aggressive disease. The relatively recent discovery of microRNAs (miRNA), a class of small noncoding RNAs targeting multiple mRNAs and triggering translation repression and/or RNA degradation, has revealed the existence of a new level of gene expression regulation. Multiple studies involving various types of human cancers proved that miRNAs have a causal role in tumorigenesis. Here we show that, in comparison to normal ovary, miRNAs are aberrantly expressed in human ovarian cancer. The overall miRNA expression could clearly separate normal versus cancer tissues. The most significantly overexpressed miRNAs were miR-200a, miR-141, miR-200c, and miR-200b, whereas miR-199a, miR-140, miR-145, and miR-125b1 were among the most down-modulated miRNAs. We could also identify miRNAs whose expression was correlated with specific ovarian cancer biopathologic features, such as histotype, lymphovascular and organ invasion, and involvement of ovarian surface. Moreover, the levels of miR-21, miR-203, and miR-205, up-modulated in ovarian carcinomas compared with normal tissues, were significantly increased after 5-aza-2'-deoxycytidine demethylating treatment of OVCAR3 cells, suggesting that the DNA hypomethylation could be the mechanism responsible for their overexpression. Our results indicate that miRNAs might play a role in the pathogenesis of human EOC and identify altered miRNA gene methylation as a possible epigenetic mechanism involved in their aberrant expression. [Cancer Res 2007;67(18):8699–707]




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