MicroRNA gene expression deregulation in human breast cancer

Marilena V Iorio, Manuela Ferracin, Chang-Gong Liu, Angelo Veronese, Riccardo Spizzo, Silvia Sabbioni, Eros Magri, Massimo Pedriali, Muller Fabbri, Manuela Campiglio, Sylvie Ménard, Juan P Palazzo, Anne Rosenberg, Piero Musiani, Stefano Volinia, Italo Nenci, George A Calin, Patrizia Querzoli, Massimo Negrini, Carlo M Croce
Cancer Research 2005 August 15, 65 (16): 7065-70
MicroRNAs (miRNAs) are a class of small noncoding RNAs that control gene expression by targeting mRNAs and triggering either translation repression or RNA degradation. Their aberrant expression may be involved in human diseases, including cancer. Indeed, miRNA aberrant expression has been previously found in human chronic lymphocytic leukemias, where miRNA signatures were associated with specific clinicobiological features. Here, we show that, compared with normal breast tissue, miRNAs are also aberrantly expressed in human breast cancer. The overall miRNA expression could clearly separate normal versus cancer tissues, with the most significantly deregulated miRNAs being mir-125b, mir-145, mir-21, and mir-155. Results were confirmed by microarray and Northern blot analyses. We could identify miRNAs whose expression was correlated with specific breast cancer biopathologic features, such as estrogen and progesterone receptor expression, tumor stage, vascular invasion, or proliferation index.

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