癌症研究
小RNA
基因表达
癌症
胶质母细胞瘤
长非编码RNA
癌变
作者
Deobrat Dixit,Briana C. Prager,Ryan C. Gimple,Hui Xian Poh,Yang Wang,Qiulian Wu,Zhixin Qiu,Reilly L. Kidwell,Leo J.Y. Kim,Qi Xie,Kristoffer Vitting-Seerup,Shruti Bhargava,Zhen Dong,Li Jiang,Zhe Zhu,Petra Hamerlik,Samie R. Jaffrey,Jing Crystal Zhao,Xiuxing Wang,Jeremy N. Rich
出处
期刊:Cancer Discovery
[American Association for Cancer Research]
日期:2021-02-01
卷期号:11 (2): 480-499
被引量:52
标识
DOI:10.1158/2159-8290.cd-20-0331
摘要
Glioblastoma is a universally lethal cancer driven by glioblastoma stem cells (GSC). Here, we interrogated N6-methyladenosine (m6A) mRNA modifications in GSCs by methyl RNA immunoprecipitation followed by sequencing and transcriptome analysis, finding transcripts marked by m6A often upregulated compared with normal neural stem cells (NSC). Interrogating m6A regulators, GSCs displayed preferential expression, as well as in vitro and in vivo dependency, of the m6A reader YTHDF2, in contrast to NSCs. Although YTHDF2 has been reported to destabilize mRNAs, YTHDF2 stabilized MYC and VEGFA transcripts in GSCs in an m6A-dependent manner. We identified IGFBP3 as a downstream effector of the YTHDF2–MYC axis in GSCs. The IGF1/IGF1R inhibitor linsitinib preferentially targeted YTHDF2-expressing cells, inhibiting GSC viability without affecting NSCs and impairing in vivo glioblastoma growth. Thus, YTHDF2 links RNA epitranscriptomic modifications and GSC growth, laying the foundation for the YTHDF2–MYC–IGFBP3 axis as a specific and novel therapeutic target in glioblastoma. Significance: Epitranscriptomics promotes cellular heterogeneity in cancer. RNA m6A landscapes of cancer and NSCs identified cell type–specific dependencies and therapeutic vulnerabilities. The m6A reader YTHDF2 stabilized MYC mRNA specifically in cancer stem cells. Given the challenge of targeting MYC, YTHDF2 presents a therapeutic target to perturb MYC signaling in glioblastoma. This article is highlighted in the In This Issue feature, p. 211
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