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Epithelial-to-mesenchymal transition (EMT) has an important role in invasion and metastasis of hepatocellular carcinoma (HCC). To explore the regulatory mechanism of atypical protein kinase C ι (aPKCι) signaling pathways to HCC development, and find an agent for targeted therapy for HCC, immortalized murine hepatocytes were employed to establish an EMT cell model of HCC, MMH-RT cells. Our study showed that EMT took place in MMH-R cells under the effect of transforming growth factor-β1 (TGF-β1) overexpressing aPKCι. Furthermore, we showed that the aPKCι blocking agent aurothiomalate (ATM) inhibited EMT and decreased invasion of hepatocytes. Moreover, ATM selectively inhibited proliferation of mesenchymal cells and HepG2 cells and induced apoptosis. However, ATM increased proliferation of epithelial cells and had little effect on apoptosis and invasion of epithelial cells. In conclusion, our result suggested that aPKCι could be an important bio-marker of tumor EMT, and used as an indicator of invasion and malignancy. ATM might be a promising agent for targeted treatment of HCC.

The aPKCι blocking agent ATM negatively regulates EMT and invasion of hepatocellular carcinoma