LncRNA-ATB promotes trastuzumab resistance and invasion-metastasis cascade in breast cancer.

ABSTRACT: Trastuzumab resistance is leading cause of mortality in HER2-positive breast cancers, and the role of TGF-?-induced epithelial-mesenchymal transition (EMT) in trastuzumab resistance is well established, but the involvement of lncRNAs in trastuzumab resistance is still unknown. Here, we generated trastuzumab-resistant breast cancer cells with increased invasiveness compared with parental cells, and observed robust epithelial-mesenchymal transition (EMT) and consistently elevated TGF-? signaling in these cells. We identified long noncoding RNA activated by TGF-? (lnc-ATB) was the most remarkably upregulated lncRNA in TR SKBR-3 cells and the tissues of TR breast cancer patients. We found that lnc-ATB could promote trastuzumab resistance and invasion-metastasis cascade in breast cancer by competitively biding miR-200c, up-regulating ZEB1 and ZNF-217, and then inducing EMT. In addition, we also found that the high level of lnc-ATB was correlated with trastuzumab resistance of breast cancer patients. Thus, these findings suggest that lncRNA-ATB, a mediator of TGF-? signaling, could predispose breast cancer patients to EMT and trastuzumab resistance.

SUBMITTER: Shi SJ 

PROVIDER: S-EPMC4484483 | biostudies-literature | 2015 May

REPOSITORIES: biostudies-literature