Hypermethylation of the tgf-β target, abca1 is associated with poor prognosis in ovarian cancer patients

Jian Liang Chou, Rui-Lan Huang, Jacqueline Shay, Lin Yu Chen, Sheng Jie Lin, Pearlly S. Yan, Wei Ting Chao, Yi Hui Lai, Yen Ling Lai, Tai Kuang Chao, Cheng I. Lee, Chien Kuo Tai, Shu Fen Wu, Kenneth P. Nephew, Tim H M Huang, Hung Cheng Lai, Michael W Y Chan

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49 引文 斯高帕斯(Scopus)


Background: The dysregulation of transforming growth factor-β (TGF-β) signaling plays a crucial role in ovarian carcinogenesis and in maintaining cancer stem cell properties. Classified as a member of the ATP-binding cassette (ABC) family, ABCA1 was previously identified by methylated DNA immunoprecipitation microarray (mDIP-Chip) to be methylated in ovarian cancer cell lines, A2780 and CP70. By microarray, it was also found to be upregulated in immortalized ovarian surface epithelial (IOSE) cells following TGF-β treatment. Thus, we hypothesized that ABCA1 may be involved in ovarian cancer and its initiation. Results: We first compared the expression level of ABCA1 in IOSE cells and a panel of ovarian cancer cell lines and found that ABCA1 was expressed in HeyC2, SKOV3, MCP3, and MCP2 ovarian cancer cell lines but downregulated in A2780 and CP70 ovarian cancer cell lines. The reduced expression of ABCA1 in A2780 and CP70 cells was associated with promoter hypermethylation, as demonstrated by bisulfite pyro-sequencing. We also found that knockdown of ABCA1 increased the cholesterol level and promoted cell growth in vitro and in vivo. Further analysis of ABCA1 methylation in 76 ovarian cancer patient samples demonstrated that patients with higher ABCA1 methylation are associated with high stage (P = 0.0131) and grade (P = 0.0137). Kaplan-Meier analysis also found that patients with higher levels of methylation of ABCA1 have shorter overall survival (P = 0.019). Furthermore, tissue microarray using 55 ovarian cancer patient samples revealed that patients with a lower level of ABCA1 expression are associated with shorter progress-free survival (P = 0.038). Conclusions: ABCA1 may be a tumor suppressor and is hypermethylated in a subset of ovarian cancer patients. Hypermethylation of ABCA1 is associated with poor prognosis in these patients.
期刊Clinical Epigenetics
出版狀態已發佈 - 1月 14 2015

ASJC Scopus subject areas

  • 遺傳學(臨床)
  • 遺傳學
  • 分子生物學
  • 發展生物學


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