Genome-wide DNA methylome analysis identifies methylation signatures associated with survival and drug resistance of ovarian cancers
Autor: | Fangfang He, Yau-Sang Chan, Wai-Yip Lam, Fushun Chen, Mingo M. H. Yung, Benjamin Li, Karen K. L. Chan, Stephanie S. Liu, David W. Chan, Hextan Y.S. Ngan, Wai-Sun Chan |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
0301 basic medicine
Decitabine Biology Demethylating agents 03 medical and health sciences 0302 clinical medicine Ovarian cancer Ovarian carcinoma Genetics medicine Methylome profiling Epigenetics Molecular Biology Gene Genetics (clinical) Research Wnt signaling pathway Epigenetic Methylation medicine.disease Tumor grading 030104 developmental biology 030220 oncology & carcinogenesis DNA methylation Cancer research Developmental Biology medicine.drug |
Zdroj: | Clinical Epigenetics |
ISSN: | 1868-7083 1868-7075 |
Popis: | Background In contrast to stable genetic events, epigenetic changes are highly plastic and play crucial roles in tumor evolution and development. Epithelial ovarian cancer (EOC) is a highly heterogeneous disease that is generally associated with poor prognosis and treatment failure. Profiling epigenome-wide DNA methylation status is therefore essential to better characterize the impact of epigenetic alterations on the heterogeneity of EOC. Methods An epigenome-wide association study was conducted to evaluate global DNA methylation in a retrospective cohort of 80 mixed subtypes of primary ovarian cancers and 30 patients with high-grade serous ovarian carcinoma (HGSOC). Three demethylating agents, azacytidine, decitabine, and thioguanine, were tested their anti-cancer and anti-chemoresistant effects on HGSOC cells. Results Global DNA hypermethylation was significantly associated with high-grade tumors, platinum resistance, and poor prognosis. We determined that 9313 differentially methylated probes (DMPs) were enriched in their relative gene regions of 4938 genes involved in small GTPases and were significantly correlated with the PI3K-AKT, MAPK, RAS, and WNT oncogenic pathways. On the other hand, global DNA hypermethylation was preferentially associated with recurrent HGSOC. A total of 2969 DMPs corresponding to 1471 genes were involved in olfactory transduction, and calcium and cAMP signaling. Co-treatment with demethylating agents showed significant growth retardation in ovarian cancer cells through differential inductions, such as cell apoptosis by azacytidine or G2/M cell cycle arrest by decitabine and thioguanine. Notably, azacytidine and decitabine, though not thioguanine, synergistically enhanced cisplatin-mediated cytotoxicity in HGSOC cells. Conclusions This study demonstrates the significant association of global hypermethylation with poor prognosis and drug resistance in high-grade EOC and highlights the potential of demethylating agents in cancer treatment. Graphic abstract |
Databáze: | OpenAIRE |
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