miR-200c inhibits TGF-β-induced-EMT to restore trastuzumab sensitivity by targeting ZEB1 and ZEB2 in gastric cancer.

Published on Jan 4, 2018in Cancer Gene Therapy4.534
· DOI :10.1038/S41417-017-0005-Y
Xinliang Zhou10
Estimated H-index: 10
(Hebei Medical University),
Xinyi Men1
Estimated H-index: 1
(Hebei Medical University)
+ 9 AuthorsBaoen Shan5
Estimated H-index: 5
(Hebei Medical University)
Sources
Abstract
Gastric cancer is the fifth most common malignancy in the world, with Eastern Asia as one of areas with the highest incidence rates. Trastuzumab, a HER2-targeting antibody, combined with chemotherapy has been successfully employed for the gastric cancer patients with HER2 overexpression/amplification. However, trastuzumab resistance is a major problem in clinical practice. Here we observed that the trastuzumab-resistant gastric cancer cell line NCI-N87/TR expressed high levels of epithelial–mesenchymal transition factors and demonstrated increased migration and invasion capability compared with NCI-N87 cells. Downregulated E-cadherin and increased N-cadherin, TGF-β, ZEB1, ZEB2, TWIST1, and Snail were detected in NCI-N87/TR cells. We also found that miR-200c was downregulated in NCI-N87/TR cells compared with parental cells NCI-87 by qRT-PCR. Treatment with TGF-β downregulated the expression of miR-200c and upregulated ZEB2, and significantly decreased the trastuzumab sensitivity of NCI-N87 cells. miR-200c restored trastuzumab sensitivity and inhibited migration and invasion through suppressing ZEB1 and ZEB2. In summary, TGF-β/ZEB2 axis plays an encouraging role in trastuzumab resistance of gastric cancer, while miR-200c overexpression downregulates ZEB1/ZEB2 and resensitizes drugs resistance. Our findings might provide a potential therapeutic strategy for trastuzumab resistance of gastric cancer.
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