Skip to main content
Top
Published in: Journal of Neuro-Oncology 3/2020

01-07-2020 | Glioma | Clinical Study

Long non-coding RNA GAS5, by up-regulating PRC2 and targeting the promoter methylation of miR-424, suppresses multiple malignant phenotypes of glioma

Authors: Chen Jin, Jie Zhao, Zhi-Ping Zhang, Ming Wu, Jian Li, Ge-Lei Xiao, Bo Liu, Yu-Xiang Liao, Jing-Ping Liu

Published in: Journal of Neuro-Oncology | Issue 3/2020

Login to get access

Abstract

Purpose

Malignant gliomas remain significant challenges in clinic and pose dismal prognosis on patients. In this study, we focused on growth arrest-specific 5 (GAS5), a tumor suppressive long non-coding RNA in glioma, explored its crosstalk with miR-424, and examined their biological functions in glioma.

Methods

Expressions of GAS5 and miR-424 were measured using qRT-PCR. The regulation of GAS5 on miR-424 expression was examined in GAS5-overexpressing glioma cells by combining methylation-specific PCR, western blotting, and RNA immunoprecipitation. Functional significance of GAS5 and miR-424 on in vitro cell proliferation, apoptosis, migration, invasion, and in vivo tumor growth was examined using colony formation, flow cytometry, wound healing, transwell assay, and the xenograft model, respectively. The potential targeting of AKT3 by miR-424 was investigated using luciferase reporter assay.

Results

GAS5 and miR-424 were significantly down-regulated in glioma cells. GAS5 directly interacted with enhancer of zeste homolog 2 (EZH2), stimulated the formation of polycomb repressive complex 2 (PRC2), reduced the levels of DNA methyltransferases (Dnmts), alleviated promoter methylation of miR-424, and promoted miR-424 expression. Functionally, GAS5, by up-regulating miR-424, inhibited cell proliferation, migration, and invasion, while increased apoptosis of glioma cells in vitro, and suppressed xenograft growth in vivo. miR-424 directly inhibited AKT3 and altered the expressions of AKT3 targets, cyclinD1, c-Myc, Bax, and Bcl-2, which might contribute to its tumor suppressive activities.

Conclusions

GAS5, by inhibiting methylation and boosting expression of miR-424, inhibits AKT3 signaling and suppresses multiple malignant phenotypes. Therefore, stimulating GAS5/miR-424 signaling may benefit the treatment of glioma.
Literature
16.
18.
go back to reference Das PP, Hendrix DA, Apostolou E, Buchner AH, Canver MC, Beyaz S, Ljuboja D, Kuintzle R, Kim W, Karnik R, Shao Z, Xie H, Xu J, De Los AA, Zhang Y, Choe J, Jun DL, Shen X, Gregory RI, Daley GQ, Meissner A, Kellis M, Hochedlinger K, Kim J, Orkin SH (2015) PRC2 is required to maintain expression of the maternal Gtl2-Rian-Mirg locus by preventing de novo DNA methylation in mouse embryonic stem cells. Cell Rep 12:1456–1470. https://doi.org/10.1016/j.celrep.2015.07.053CrossRefPubMedPubMedCentral Das PP, Hendrix DA, Apostolou E, Buchner AH, Canver MC, Beyaz S, Ljuboja D, Kuintzle R, Kim W, Karnik R, Shao Z, Xie H, Xu J, De Los AA, Zhang Y, Choe J, Jun DL, Shen X, Gregory RI, Daley GQ, Meissner A, Kellis M, Hochedlinger K, Kim J, Orkin SH (2015) PRC2 is required to maintain expression of the maternal Gtl2-Rian-Mirg locus by preventing de novo DNA methylation in mouse embryonic stem cells. Cell Rep 12:1456–1470. https://​doi.​org/​10.​1016/​j.​celrep.​2015.​07.​053CrossRefPubMedPubMedCentral
31.
go back to reference Schmittgen TD, Livak KJ (2008) Analyzing real-time PCR data by the comparative C(T) method. Nat Protoc 3:1101–1108CrossRefPubMed Schmittgen TD, Livak KJ (2008) Analyzing real-time PCR data by the comparative C(T) method. Nat Protoc 3:1101–1108CrossRefPubMed
42.
go back to reference Zhang H, Wang X, Chen Z, Wang W (2015) MicroRNA-424 suppresses estradiol-induced cell proliferation via targeting GPER in endometrial cancer cells. Cell Mol Biol (Noisy-le-grand) 61:96–101 Zhang H, Wang X, Chen Z, Wang W (2015) MicroRNA-424 suppresses estradiol-induced cell proliferation via targeting GPER in endometrial cancer cells. Cell Mol Biol (Noisy-le-grand) 61:96–101
Metadata
Title
Long non-coding RNA GAS5, by up-regulating PRC2 and targeting the promoter methylation of miR-424, suppresses multiple malignant phenotypes of glioma
Authors
Chen Jin
Jie Zhao
Zhi-Ping Zhang
Ming Wu
Jian Li
Ge-Lei Xiao
Bo Liu
Yu-Xiang Liao
Jing-Ping Liu
Publication date
01-07-2020
Publisher
Springer US
Published in
Journal of Neuro-Oncology / Issue 3/2020
Print ISSN: 0167-594X
Electronic ISSN: 1573-7373
DOI
https://doi.org/10.1007/s11060-020-03544-2

Other articles of this Issue 3/2020

Journal of Neuro-Oncology 3/2020 Go to the issue