期刊
NUCLEIC ACIDS RESEARCH
卷 46, 期 8, 页码 4213-4227出版社
OXFORD UNIV PRESS
DOI: 10.1093/nar/gky087
关键词
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资金
- China Scholarship Council (CSC)
- ERC-AdG enhReg [322493]
- ERC-ITN RNA TRAIN [607720]
- Edmond J. Safra Center for Bioinformatics Fellowship
- Human Frontier Science Program [LT000640/2013]
- CSC
- RNATrain [607720]
- European Research Council (ERC) [322493] Funding Source: European Research Council (ERC)
Oncogene-induced senescence (OIS), provoked in response to oncogenic activation, is considered an important tumor suppressor mechanism. Long noncoding RNAs (IncRNAs) are transcripts longer than 200 nt without a protein-coding capacity. Functional studies showed that deregulated IncRNA expression promote tumorigenesis and metastasis and that IncRNAs may exhibit tumor-suppressive and oncogenic function. Here, we first identified IncRNAs that were differentially expressed between senescent and non-senescent human fibroblast cells. Using RNA interference, we performed a loss-function screen targeting the differentially expressed IncRNAs, and identified lncRNA-OIS1 (lncRNA#32, AC008063.3 or ENSG00000233397) as a IncRNA required for OIS. Knockdown of lncRNA-OIS1 triggered bypass of senescence, higher proliferation rate, lower abundance of the cell-cycle inhibitor CDKN1A and high expression of cell-cycle-associated genes. Subcellular inspection of lncRNA-OIS1 indicated nuclear and cytosolic localization in both normal culture conditions as well as following oncogene induction. Interestingly, silencing lncRNA-OIS1 diminished the senescent-associated induction of a nearby gene (Dipeptidyl Peptidase 4, DPP4) with established role in tumor suppression. Intriguingly, similarto IncRNA0IS1, silencing DPP4 caused senescence bypass, and ectopic expression of DPP4 in lncRNA-OIS1 knockdown cells restored the senescent phenotype. Thus, our data indicate that lncRNA-0IS1 links oncogenic induction and senescence with the activation of the tumor suppressor DPP4.
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