title: Long noncoding RNA ANRIL indicates a poor prognosis of gastric cancer and promotes tumor growth by epigenetically silencing of miR-99a/miR-449a.
abstract: Long noncoding RNAs are involved in diseases including cancer. Here, we reported that ANRIL (CDKN2B-AS1), a 3.8-kb long noncoding RNA, recruiting and binding to PRC2, was generally upregulated in human gastric cancer (GC) tissues. In a cohort of 120 GC patients, the higher expression of ANRIL was significantly correlated with a higher TNM stage (P=0.041) and tumor size (P=0.001). Multivariate analyses revealed that ANRIL expression served as an independent predictor for overall survival (P=0.036). Further experiments revealed that ANRIL knockdown significantly repressed the proliferation both in vitro and in vivo. We also showed that E2F1 could induce ANRIL and ANRIL-mediated growth promotion is in part due to epigenetic repression of miR-99a/miR-449a in Trans (controlling the targets--mTOR and CDK6/E2F1 pathway) by binding to PRC2, thus forming a positive feedback loop, continuing to promote GC cell proliferation. To our knowledge, this is the first report showed that the role of ANRIL in the progression of GC and ANRIL could crosstalk with microRNAs in epigenetic level. Our results suggest that ANRIL, as a growth regulator, may serve as a candidate prognostic biomarker and target for new therapies in human gastric cancer.
authors.affiliation: Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, Jiangsu, PR China.
authors.forename: Er-bao
authors.initials: EB
authors.lastname: Zhang
authors.forename: Rong
authors.initials: R
authors.lastname: Kong
authors.forename: Dan-dan
authors.initials: DD
authors.lastname: Yin
authors.forename: Liang-hui
authors.initials: LH
authors.lastname: You
authors.forename: Ming
authors.initials: M
authors.lastname: Sun
authors.forename: Liang
authors.initials: L
authors.lastname: Han
authors.forename: Tong-peng
authors.initials: TP
authors.lastname: Xu
authors.forename: Rui
authors.initials: R
authors.lastname: Xia
authors.forename: Jin-song
authors.initials: JS
authors.lastname: Yang
authors.forename: Wei
authors.initials: W
authors.lastname: De
authors.forename: Jin fei
authors.initials: Jf
authors.lastname: Chen
mesh_terms: D000818:Animals; D015153:Blotting, Western; D047369:Chromatin Immunoprecipitation; D018572:Disease-Free Survival; D044127:Epigenesis, Genetic; D005260:Female; D005434:Flow Cytometry; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D020868:Gene Silencing; D064593:Heterografts; D006801:Humans; D007150:Immunohistochemistry; D053208:Kaplan-Meier Estimate; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D035683:MicroRNAs / Q000235:genetics*; D008875:Middle Aged; D011379:Prognosis; D016016:Proportional Hazards Models; D062085:RNA, Long Noncoding / Q000235:genetics*; D060888:Real-Time Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000235:genetics* / Q000401:mortality; D014162:Transfection
chemical_list: C561518:CDKN2B antisense RNA, human; C544530:MIRN449 microRNA, human; C561679:MIRN99 microRNA, human; D035683:MicroRNAs; D062085:RNA, Long Noncoding