MicroRNA let-7c inhibits migration and invasion of human non-small cell lung cancer by targeting ITGB3 and MAP4K3

Cancer Lett. 2014 Jan 1;342(1):43-51. doi: 10.1016/j.canlet.2013.08.030. Epub 2013 Aug 24.


MicroRNAs play an important regulatory role in carcinogenesis and cancer metastasis. Different members of let-7 family have been reported to be decreased in human lung tumors. However, the effect of specific let-7 member on metastasis of NSCLC remains undefined. Our current study detected the expression of let-7 members in 94 cases of NSCLC and a significant association was noticed between low levels of let-7c expression and metastasis, venous invasion, advanced TNM stages and poor survival of NSCLC patients. Consistently, ectopic expression of let-7c in relatively highly metastatic cells remarkably suppressed their migration and invasion. Inhibition of let-7c in cells with relatively low metastatic potential promoted their motility and invasion. We then analyzed the potential targets of let-7c and found that ITGB3 and MAP4K3 were directly repressed by let-7c. Upon restoring the expression of ITGB3 and MAP4K3, the effects of let-7c on tumor metastasis were partially reversed, and more importantly, the expression levels of ITGB3 and MAP4K3 were inversely correlated with let-7c in 64 NSCLC tissues. Collectively, our results suggest that let-7c, by degrading ITGB3 and MAP4K3, prevents NSCLC metastasis.

Keywords: Let-7c; MicroRNA; Migration and invasion; NSCLC.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 3' Untranslated Regions
  • Adenocarcinoma / genetics
  • Adenocarcinoma / metabolism*
  • Adenocarcinoma / mortality
  • Adenocarcinoma / secondary
  • Base Sequence
  • Binding Sites
  • Carcinoma, Non-Small-Cell Lung / genetics
  • Carcinoma, Non-Small-Cell Lung / metabolism
  • Carcinoma, Non-Small-Cell Lung / mortality
  • Carcinoma, Non-Small-Cell Lung / secondary
  • Carcinoma, Squamous Cell / genetics
  • Carcinoma, Squamous Cell / metabolism*
  • Carcinoma, Squamous Cell / mortality
  • Carcinoma, Squamous Cell / secondary
  • Cell Line, Tumor
  • Cell Movement*
  • Disease-Free Survival
  • Female
  • Gene Expression
  • Gene Expression Regulation, Neoplastic
  • Humans
  • Integrin beta3 / genetics*
  • Integrin beta3 / metabolism
  • Kaplan-Meier Estimate
  • Lung Neoplasms / genetics
  • Lung Neoplasms / metabolism*
  • Lung Neoplasms / mortality
  • Lung Neoplasms / pathology
  • Male
  • MicroRNAs / genetics*
  • Middle Aged
  • Neoplasm Invasiveness
  • Protein-Serine-Threonine Kinases / genetics*
  • Protein-Serine-Threonine Kinases / metabolism
  • RNA Interference
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism


  • 3' Untranslated Regions
  • ITGB3 protein, human
  • Integrin beta3
  • MicroRNAs
  • RNA, Messenger
  • mirnlet7 microRNA, human
  • MAP4K3 protein, human
  • Protein-Serine-Threonine Kinases