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Long non-coding RNA HAND2-AS1 inhibits invasion and metastasis in endometrioid endometrial carcinoma through
Xueying Yang1, Chi Chiu Wang2, Wayne Yuk Wai Lee3
1Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, China.
Abstract:
Endometrioid endometrial carcinoma (EEC) is one of the common causes of cancer-related mortality in women. Mounting evidences suggest that long noncoding RNAs (lncRNAs) function in multiple cancers. In this study, we discovered that HAND2-AS1, a lncRNA transcribed antisense adjacent to Heart and Neural Crest Derivatives Expressed 2 (HAND2) in chromosome 4q33-34, is significantly down-regulated in EEC. HAND2-AS1 and HAND2 were frequently down-regulated in EEC tissues, especially in poor differentiated tumor tissues. Down-regulation of HAND2-AS1 and HAND2 was correlated with tumor grade, lymph node metastasis and recurrence of EEC patients. HAND2-AS1 and HAND2 were co-downregulated by promoter DNA hypermethylation in EEC. Overexpression of HAND2-AS1 in EEC cells demonstrated that HAND2-AS1 suppressed migration and invasion of EEC cells. Similarly, overexpression of HAND2 also inhibited migration and invasion EEC cells indicating that HAND2-AS1 and HAND2 had a concordant role in the progression of EEC. However, HAND2 was not regulated by HAND2-AS1 in EEC. Furthermore, the anti-tumorigenic effect of HAND2-AS1 was mediated by down-regulating NMU, which has an oncogenic role in EEC. Our findings therefore provide the first evidence that HAND2-AS1 is a critical tumor suppressor in EEC.
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