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Journal Article
Research Support, Non-U.S. Gov't
Differentiation Therapy by Epigenetic Reconditioning Exerts Antitumor Effects on Liver Cancer Cells.
Molecular Therapy 2018 July 6
Primary liver tumors are mainly represented by hepatocellular carcinoma (HCC), one of the most aggressive and resistant forms of cancer. Liver tumorigenesis is characterized by an accumulation of epigenetic abnormalities, leading to gene extinction and loss of hepatocyte differentiation. The aim of this work was to investigate the feasibility of converting liver cancer cells toward a less aggressive and differentiated phenotype using a process called epigenetic reconditioning. Here, we showed that an epigenetic regimen with non-cytotoxic doses of the demethylating compound 5-azacytidine (5-AZA) promoted an anti-cancer response by inhibiting HCC cell tumorigenicity. Furthermore, epigenetic reconditioning improved sorafenib response. Remarkably, epigenetic treatment was associated with a significant restoration of differentiation, as attested by the increased expression of characteristic hepatocyte markers in reconditioned cells. In particular, we showed that reexpression of these epigenetically silenced liver genes following 5-AZA treatment or after knockdown of DNA methyltransferase 1 (DNMT1) was the result of regional CpG demethylation. Lastly, we confirmed the efficacy of HCC differentiation therapy by epigenetic reconditioning using an in vivo tumor growth model. In summary, this work demonstrates that epigenetic reconditioning using the demethylating compound 5-AZA shows therapeutic significance for liver cancer and is potentially attractive for the treatment of solid tumors.
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