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      Long non-coding RNA in glioma: signaling pathways

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          Abstract

          Glioma is regarded as the most prevalent malignant carcinoma of the central nervous system. Thus, the development of new therapeutic strategies targeting glioma is of significant clinical importance. Long non-coding RNAs (lncRNAs) are functional RNA molecules without a protein-coding function and are reportedly involved in the initiation and progression of glioma. Dysregulation of lncRNAs in glioma is due to activation of several signaling pathways, such as the BRD4-HOTAIR-β-catenin/PDCD4, p53-Hif-H19/IGF2 and CRNDE/mTOR pathways. Furthermore, microRNAs (miRNAs) such as miR-675 also interact with lncRNAs in glioma. Thus, exploring the mechanisms by which lncRNA control processes will be instrumental for devising new effective therapies against glioma.

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          Repression of the human dihydrofolate reductase gene by a non-coding interfering transcript.

          Igor Martianov, Aroul Ramadass, Ana Serra Barros … (2007)
          Alternative promoters within the same gene are a general phenomenon in gene expression. Mechanisms of their selective regulation vary from one gene to another and are still poorly understood. Here we show that in quiescent cells the mechanism of transcriptional repression of the major promoter of the gene encoding dihydrofolate reductase depends on a non-coding transcript initiated from the upstream minor promoter and involves both the direct interaction of the RNA and promoter-specific interference. The specificity and efficiency of repression is ensured by the formation of a stable complex between non-coding RNA and the major promoter, direct interaction of the non-coding RNA with the general transcription factor IIB and dissociation of the preinitiation complex from the major promoter. By using in vivo and in vitro assays such as inducible and reconstituted transcription, RNA bandshifts, RNA interference, chromatin immunoprecipitation and RNA immunoprecipitation, we show that the regulatory transcript produced from the minor promoter has a critical function in an epigenetic mechanism of promoter-specific transcriptional repression.
          Article 0 comments Cited 261 times – based on 0 reviews     Review now
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            The noncoding RNA taurine upregulated gene 1 is required for differentiation of the murine retina.

            T L Young, T. Matsuda, C Cepko (2005)
            With the advent of genome-wide analyses, it is becoming evident that a large number of noncoding RNAs (ncRNAs) are expressed in vertebrates. However, of the thousands of ncRNAs identified, the functions of relatively few have been established. In a screen for genes upregulated by taurine in developing retinal cells, we identified a gene that appears to be a ncRNA. Taurine Upregulated Gene 1 (TUG1) is a spliced, polyadenylated RNA that does not encode any open reading frame greater than 82 amino acids in its full-length, 6.7 kilobase (kb) RNA sequence. Analyses of Northern blots and in situ hybridization revealed that TUG1 is expressed in the developing retina and brain, as well as in adult tissues. In the newborn retina, knockdown of TUG1 with RNA interference (RNAi) resulted in malformed or nonexistent outer segments of transfected photoreceptors. Immunofluorescent staining and microarray analyses suggested that this loss of proper photoreceptor differentiation is a result of the disregulation of photoreceptor gene expression. A function for a newly identified ncRNA, TUG1, has been established. TUG1 is necessary for the proper formation of photoreceptors in the developing rodent retina.
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              Long non-coding RNA expression profiles predict clinical phenotypes in glioma.

              Xiaoqin Zhang, Stella Sun, Jenny Kan-Suen Pu … (2012)
              Glioma is the commonest form of primary brain tumor in adults with varying malignancy grades and histological subtypes. Long non-coding RNAs (lncRNAs) are a novel class of non-protein-coding transcripts that have been shown to play important roles in cancer development. To discover novel tumor-related lncRNAs and determine their associations with glioma subtypes, we first applied a lncRNA classification pipeline to identify 1970 lncRNAs that were represented on Affymetrix HG-U133 Plus 2.0 array. We then analyzed the lncRNA expression patterns in a set of previously published glioma gene expression profiles of 268 clinical specimens, and identified sets of lncRNAs that were unique to different histological subtypes (astrocytic versus oligodendroglial tumors) and malignancy grades. These lncRNAs signatures were then subject to validation in another non-overlapping, independent data set that contained 157 glioma samples. This is the first reported study that correlates lncRNA expression profiles with malignancy grade and histological differentiation in human gliomas. Our findings indicate the potential roles of lncRNAs in the biogenesis, development and differentiation of gliomas, and provide an important platform for future studies. Copyright © 2012 Elsevier Inc. All rights reserved.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Oncotarget
                Journal ID (iso-abbrev): Oncotarget
                Journal ID (publisher-id): Oncotarget
                Journal ID (publisher-id): ImpactJ
                Title: Oncotarget
                Publisher: Impact Journals LLC
                ISSN (Electronic): 1949-2553
                Publication date Collection: 18 April 2017
                Publication date (Electronic): 7 February 2017
                Volume: 8
                Issue: 16
                Pages: 27582-27592
                Affiliations
                1 Department of Neurosurgery, The Third Affiliated Hospital of Soochow University, Changzhou, China
                Author notes
                Correspondence to: Suinuan Wang, wangsuinuan0019@ 123456126.com
                Article
                Publisher ID: 15175
                DOI: 10.18632/oncotarget.15175
                PMC ID: 5432359
                PubMed ID: 28187439
                SO-VID: a3688a18-20e4-43e7-9570-3be385229146
                Copyright © Copyright: © 2017 Shi et al.
                License:

                This article is distributed under the terms of the Creative Commons Attribution License (CC-BY), which permits unrestricted use and redistribution provided that the original author and source are credited.

                History
                Date received : 11 November 2016
                Date accepted : 24 January 2017
                Categories
                Subject: Review

                ScienceOpen disciplines: Oncology & Radiotherapy
                Keywords: long non-coding rnas,glioma,microrna
                Data availability:
                ScienceOpen disciplines: Oncology & Radiotherapy
                Keywords: long non-coding rnas, glioma, microrna

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