LincRNA-RoR/miR-145 promote invasion and metastasis in triple-negative breast cancer via targeting MUC1.

Triple-negative breast cancer (TNBC) was associated with high rates of cancer recurrence and metastasis and currently no available molecularly target. Accumulating evidences have established the importance of lincRNA-ROR as a marker of cancers. In order to better understand the mechanism of lincRNA-ROR in TNBC, we provided a novel molecular target into the regulatory invasion and metastasis in present research. We found that lincRNA-ROR was upregulated in TNBC cell lines and tissue samples. The aberrant expression of lincRNA-ROR was shown to increase invasion and metastasis in MDA-MB-231 and loss of function by siRNA reverse these process. Furthermore, lincRNA-ROR functions as a competing endogenous RNAs (ceRNA) which sponges miR-145 and therefore upregulate the expression of Mucin1 (MUC1). The expression of MUC1 impacted E-cadherin membrane localization. Together, MUC1 was a potential molecular target may help explain the role of lincRNA-ROR/miR-145 for invasion and metastasis in TNBC cell lines.