miRNA-145 inhibits non-small cell lung cancer cell proliferation by targeting c-Myc

J Exp Clin Cancer Res. 2010 Nov 22;29(1):151. doi: 10.1186/1756-9966-29-151.


MicroRNAs are important gene regulators that potentially play a profound role in tumorigenesis. Increasing evidence indicates that miR-145 is a tumor suppressor capable of inhibiting breast and colon cancer cell growth both in vitro and in vivo. However, the biological function of miR-145 in non-small cell lung cancer (NSCLC) is largely unknown. In colon cancer cells, c-Myc is a confirmed direct target for miR-145. The aim of this work was to investigate the effect of miR-145 and c-Myc on proliferation of NSCLC cells, using the NSCLC cell lines A549 and H23 as models. We determined the expression level of miR-145 in tumor tissues relative to adjacent non-tumor tissues, and in NSCLC cell lines relative to non-malignant lung cells. Downregulation of miR-145 was seen in tumor tissues and the two NSCLC cell lines by real-time quantitative reverse transcription polymerase chain reaction. MTT and focus formation assays were conducted to measure cell proliferation rates. Cell growth was inhibited and the G1/S transition was blocked by miR-145 in transfection assays of A549 and H23 cells. We further showed that c-Myc was a direct target for miR-145. Introduction of miR-145 dramatically suppressed the c-Myc/eIF4E pathway, which was demonstrated to be crucial for cell proliferation in NSCLC cells. Furthermore, we found that CDK4 was regulated by miR-145 in cell cycle control. Taken together, our study results demonstrate that miR-145 inhibits proliferation of NSCLC cells through c-Myc. Increasing miR-145 expression may provide a novel approach for the treatment of NSCLC.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Blotting, Western
  • Carcinoma, Non-Small-Cell Lung / genetics*
  • Carcinoma, Non-Small-Cell Lung / pathology
  • Cell Proliferation
  • Gene Expression Profiling
  • Gene Expression Regulation, Neoplastic*
  • Humans
  • Lung Neoplasms / genetics*
  • Lung Neoplasms / pathology
  • MicroRNAs / genetics*
  • Oligonucleotide Array Sequence Analysis
  • Proto-Oncogene Proteins c-myc / genetics*
  • Reverse Transcriptase Polymerase Chain Reaction
  • Transfection


  • MIRN145 microRNA, human
  • MYC protein, human
  • MicroRNAs
  • Proto-Oncogene Proteins c-myc