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Cancer Research 67, 6092, July 1, 2007. doi: 10.1158/0008-5472.CAN-06-4607
© 2007 American Association for Cancer Research
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Molecular Biology, Pathobiology, and Genetics

Cyclin G1 Is a Target of miR-122a, a MicroRNA Frequently Down-regulated in Human Hepatocellular Carcinoma

Laura Gramantieri1, Manuela Ferracin2, Francesca Fornari1, Angelo Veronese2,3, Silvia Sabbioni2, Chang-Gong Liu4, George A. Calin4, Catia Giovannini1, Eros Ferrazzi3, Gian Luca Grazi1, Carlo M. Croce2,4, Luigi Bolondi1 and Massimo Negrini2,4

1 Dipartimento di Medicina Interna e Gastroenterologia e Centro di Ricerca Biomedica Applicata, Università di Bologna, Bologna, Italy; 2 Dipartimento di Medicina Sperimentale e Diagnostica e Centro Interdipartimentale per la Ricerca sul Cancro, Università di Ferrara, Ferrara, Italy; 3 Istituto Oncologico Veneto, Rovigo, Italy; and 4 Comprehensive Cancer Center, Ohio State University, Columbus, Ohio

Requests for reprints: Massimo Negrini, Dipartimento di Medicina Sperimentale e Diagnostica, Università di Ferrara, via Luigi Borsari 46, 44100 Ferrara, Italy. Phone: 39-0532-291399/291400; Fax: 39-0532-247618; E-mail: ngm{at}unife.it.

We investigated the role of microRNAs (miRNAs) in the pathogenesis of human hepatocellular carcinoma (HCC). A genome-wide miRNA microarray was used to identify differentially expressed miRNAs in HCCs arisen on cirrhotic livers. Thirty-five miRNAs were identified. Several of these miRNAs were previously found deregulated in other human cancers, such as members of the let-7 family, mir-221, and mir-145. In addition, the hepato-specific miR-122a was found down-regulated in ~70% of HCCs and in all HCC-derived cell lines. Microarray data for let-7a, mir-221, and mir-122a were validated by Northern blot and real-time PCR analysis. Understanding the contribution of deregulated miRNAs to cancer requires the identification of gene targets. Here, we show that miR-122a can modulate cyclin G1 expression in HCC-derived cell lines and an inverse correlation between miR-122a and cyclin G1 expression exists in primary liver carcinomas. These results indicate that cyclin G1 is a target of miR-122a and expand our knowledge of the molecular alterations involved in HCC pathogenesis and of the role of miRNAs in human cancer. [Cancer Res 2007;67(13):6092–9]




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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cancer Prevention Research
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Annual Meeting Education Book Meeting Abstracts Online
Copyright © 2007 by the American Association for Cancer Research.