title: Downregulation of long noncoding RNA MEG3 is associated with poor prognosis and promoter hypermethylation in cervical cancer.
abstract: Our previous study reported that MEG3 is an important tumor suppressor gene that is inactivated in cervical cancer. However, the diagnostic and prognostic values of MEG3, as well as the molecular mechanism of MEG3 inactivation in cervical cancer, remain unclear. In this study, we aimed to further elucidate the role and potential inactivation mechanism of MEG3 in cervical cancer.
  
  
  
  ROC curve and Cox regression analyses were used to assess the diagnostic and prognostic value of MEG3 in patients with cervical cancer. The methylation status of the MEG3 promoter in cervical cancer tissue samples was tested using methylation-specific PCR. Furthermore, we altered the methylation status of the MEG3 promoter in two cervical cancer cell lines (HeLa and CaSki) using a DNA methylation transfer enzyme inhibitor (5-Aza-CdR), to investigate whether promoter hypermethylation is a potential cause of MEG3 inactivation. Finally, we used CCK-8 and colony formation assays to evaluate the cell proliferation ability of HeLa and CaSki cells that had been treated with 5-aza-CdR, to investigate whether downregulation of MEG3 caused by promoter hypermethylation had biological effects.
  
  
  
  ROC curve analysis indicated that MEG3 status showed sufficient sensitivity and specificity for prediction of tumor size and lymph node metastasis in patients with cervical cancer. In addition, our follow-up data showed that low MEG3 expression was correlated with recurrence and short overall survival. Moreover, hypermethylation of the MEG3 promoter was observed in most cervical cancer tissue samples, and demethylation of the MEG3 promoter led to re-expression of MEG3 and inhibited proliferation of HeLa and CaSki cells.
  
  
  
  MEG3 is a powerful tool for diagnosis and prognosis of patients with cervical cancer, and low expression of MEG3 is likely to be related to promoter hypermethylation in cervical cancer.
authors.affiliation: Department of Obstetrics and Gynecology, The Second Clinical Medical College (Shenzhen People's Hospital), Jinan University, Shenzhen, 518020, People's Republic of China.|Department of Gynecological Oncology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510120, People's Republic of China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Gynecological Oncology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510120, People's Republic of China.
authors.forename: Zhongqiu
authors.initials: Z
authors.lastname: Lin
authors.affiliation: Department of Ophthalmology, The Second Clinical Medical College (Shenzhen People's Hospital), Jinan University, Shenzhen, 518020, People's Republic of China. Gaoylsz@126.com.
authors.forename: Yali
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Gynecological Oncology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510120, People's Republic of China. tingtingyaotty@126.com.
authors.forename: Tingting
authors.initials: T
authors.lastname: Yao
mesh_terms: D045744:Cell Line, Tumor; D019175:DNA Methylation; D015536:Down-Regulation; D044127:Epigenesis, Genetic; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006367:HeLa Cells; D006801:Humans; D009362:Neoplasm Metastasis; D011379:Prognosis; D011401:Promoter Regions, Genetic; D062085:RNA, Long Noncoding / Q000235:genetics*; D012372:ROC Curve; D016019:Survival Analysis; D047368:Tumor Burden; D002583:Uterine Cervical Neoplasms / Q000175:diagnosis* / Q000235:genetics
chemical_list: C498907:MEG3 non-coding RNA, human; D062085:RNA, Long Noncoding
keywords: Cervical cancer; Diagnosis; Long noncoding RNA; MEG3; Methylation; Prognosis