Journal
ONCOLOGY RESEARCH
Volume 21, Issue 6, Pages 345-352Publisher
COGNIZANT COMMUNICATION CORP
DOI: 10.3727/096504014X14024160459285
Keywords
Lung cancer; miR-136; Smad2; Smad3
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Funding
- Natural Science Foundation of China [81330058, 81372686, 41176128]
- National Science and Technique Major Project [2012ZK10004213, 311030, 201305017, 2012ZX09102101-017]
- Key Science and Technique Research Project of Guangzhou City [12B292060029]
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TGF-beta/Smad signaling induces epithelial mesenchymal transition (EMT) and tumor metastasis. As essential mediators in this pathway, Smad2 and Smad3 have been extensively studied and found to promote EMT and the subsequent mobility as well as invasiveness of lung cancer cells. In the present study, we determined that miR-136 directly targeted Smad2 and Smad3, leading to reduced migration and invasiveness of lung adenocarcinoma (ADC) cell lines, accompanied by increased epithelial markers as well as decreased mesenchymal markers. Moreover, ectopic expression of either Smad2 or Smad3 partially restored the malignant phenotype of ADC cells overexpressing miR-136. Taken together, our data demonstrate that miR-136 may play a tumor-suppressive role by repressing EMT and prometastatic traits via targeting Smad2 and Smad3. The potent antimetastasis property of miR-136 and its multitarget mechanism provide new insights in developing novel therapeutic approaches.
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