MiR-199a-3p regulates mTOR and c-Met to influence the doxorubicin sensitivity of human hepatocarcinoma cells

Francesca Fornari, Maddalena Milazzo, Pasquale Chieco, Massimo Negrini, George Adrian Calin, Gian Luca Grazi, Daniela Pollutri, Carlo Maria Croce, Luigi Bolondi, Laura Gramantieri

Research output: Contribution to journalArticlepeer-review

Abstract

MicroRNAs (miRNA) have rapidly emerged as modulators of gene expression in cancer in which they may have great diagnostic and therapeutic import. MicroRNA-199a-3p (miR-199a-3p) is downregulated in several human malignancies including hepatocellular carcinoma (HCC). Here, we show that miR-199a-3p targets mammalian target of rapamycin (mTOR) and c-Met in HCC cells. Restoring attenuated levels of miR-199a-3p in HCC cells led to G1-phase cell cycle arrest, reduced invasive capability, enhanced susceptibility to hypoxia, and increased sensitivity to doxorubicin-induced apoptosis. These in vitro findings were confirmed by an analysis of human HCC tissues, which revealed an inverse correlation linking miR-199a-3p and mTOR as well as a shorter time to recurrence after HCC resection in patients with lower miR-199a-3p expression. These results suggest that tactics to regulate mTOR and c-Met by elevating levels of miR-199a-3p may have therapeutic benefits in highly lethal cancers such as HCC.

Original languageEnglish
Pages (from-to)5184-5193
Number of pages10
JournalCancer Research
Volume70
Issue number12
DOIs
Publication statusPublished - Jun 15 2010

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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