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An Epigenetic Mechanism Underlying Doxorubicin Induced EMT in the Human BGC-823 Gastric Cancer Cell

  • Han, Rong-Fei (Department of Immunology, Wuhan University School of Basic Medical Science) ;
  • Ji, Xiang (Department of Immunology, Wuhan University School of Basic Medical Science) ;
  • Dong, Xing-Gao (Department of Immunology, Hubei University for Nationalities) ;
  • Xiao, Rui-Jing (Department of Immunology, Wuhan University School of Basic Medical Science) ;
  • Liu, Yan-Ping (Department of Neurology, Huashan Hospital, Fudan University) ;
  • Xiong, Jie (Department of Immunology, Wuhan University School of Basic Medical Science) ;
  • Zhang, Qiu-Ping (Department of Immunology, Wuhan University School of Basic Medical Science)
  • 발행 : 2014.05.30

초록

The epithelial to mesenchymal transition (EMT) is a key step during embryonic morphogenesis and plays an important role in drug resistance and metastasis in diverse solid tumors. We previously reported that 48 h treatment of anti-cancer drug doxorubicin could induce EMT in human gastric cancer BGC-823 cells. However, the long term effects of this transient drug treatment were unknown. In this study we found that after 48 h treatment with $0.1{\mu}g/ml$ doxorubicin, most cells died during next week, while a minor population of cells survived and formed colonies. We propagated the surviving cells in drug free medium and found that these long term cultured drug survival cells (abbreviated as ltDSCs) retained a mesenchymal-like cell morphology, and expressed high levels of EMT-related molecules such as vimentin, twist and ${\beta}$-catenin. The expression of chromatin reprogramming factors, Oct4 and c-myc, were also higher in ltDSCs than parental cells. We further demonstrated that the protein level of p300 was upregulated in ltDSCs, and inhibition of p300 by siRNA suppressed the expression of vimentin. Moreover, the ltDSCs had higher colony forming ability and were more drug resistant when compared to parental cells. Our results suggested that an epigenetic mechanism is involved in the EMT of ltDSCs.

키워드

참고문헌

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