HERV-E-mediated modulation of PLA2G4A transcription in urothelial carcinoma
Human endogenous retroviruses (HERV) and related elements account for more than 8% of the human genome and significantly contribute to the human transcriptome by long terminal repeat (LTR) promoter activity. In this context, HERVs are thought to intervene in the expression of adjacent genes by provi...
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| Hauptverfasser: | , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
November 7, 2012
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| In: |
PLOS ONE
Year: 2012, Jahrgang: 7, Heft: 11, Pages: 0049341 |
| ISSN: | 1932-6203 |
| DOI: | 10.1371/journal.pone.0049341 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1371/journal.pone.0049341 Verlag, kostenfrei, Volltext: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0049341 
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| Verfasserangaben: | Darko Gosenca, Ute Gabriel, Annette Steidler, Jens Mayer, Olivia Diem, Philipp Erben, Alice Fabarius, Christine Leib-Mösch, Wolf-Karsten Hofmann, Wolfgang Seifarth |
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| 245 | 1 | 0 | |a HERV-E-mediated modulation of PLA2G4A transcription in urothelial carcinoma |c Darko Gosenca, Ute Gabriel, Annette Steidler, Jens Mayer, Olivia Diem, Philipp Erben, Alice Fabarius, Christine Leib-Mösch, Wolf-Karsten Hofmann, Wolfgang Seifarth |
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| 520 | |a Human endogenous retroviruses (HERV) and related elements account for more than 8% of the human genome and significantly contribute to the human transcriptome by long terminal repeat (LTR) promoter activity. In this context, HERVs are thought to intervene in the expression of adjacent genes by providing regulatory sequences (cis-effect) or via noncoding RNA including natural antisense transcripts. To address the potential impact of HERV activity in urothelial carcinoma, we comparatively analyzed the HERV transcription profiles in paired samples of non-malignant urothelium and urothelial carcinoma derived from 13 patients with bladder cancer by means of a retrovirus-specific microarray (RetroArray). We established a characteristic HERV signature consisting of six ubiquitously active HERV subgroups (E4-1, HERV-Rb, ERV9, HERV-K-T47D, NMWV3, HERV-KC4). The transcription pattern is largely identical in human urothelial carcinoma, non-malignant urothelial tissue, four tumor-derived cell lines and in a non-malignant urothelial cell line (UROtsa). Quantitative reverse transcriptase PCR (qRT-PCR) of HERV-E4-1, HERV-K(HML-6) and HERV-T(S71-TK1) revealed a bias to lower HERV activity in carcinoma samples compared to non-malignant tissue. Determination of active HERV-E4-1 loci by cloning and sequencing revealed six HERV-E4-1 proviral loci that are differentially regulated in urothelial carcinoma cells and normal tissue. Two full-length HERV-E4-1 proviruses, HERV-Ec1 and HERV-Ec6, are located in antisense orientation in introns of the genes PLA2G4A and RNGTT, respectively. PLA2G4A encodes a cytosolic phospholipase A2 (cPLA2) that is dysregulated in many human tumors. PLA2G4A and HERV-Ec1 displayed reciprocal transcript levels in 7 of 11 urothelial carcinoma patients. Moreover, reciprocal shifts were observed after treatment of UROtsa cells with HERV-Ec1 and PLA2G4A-directed siRNAs or 5-aza-2'-deoxycytidine (aza-dC) pointing to an antagonistic regulation of PLA2G4A and HERV-Ec1 transcription in human urothelial cells. We suggest that transcription of HERV-Ec1 contributes to fine tuning of cPLA2 expression, thereby facilitating tumorigenesis. | ||
| 650 | 4 | |a Carcinomas | |
| 650 | 4 | |a Genetic loci | |
| 650 | 4 | |a Human genomics | |
| 650 | 4 | |a Introns | |
| 650 | 4 | |a Polymerase chain reaction | |
| 650 | 4 | |a Small interfering RNAs | |
| 650 | 4 | |a Transcriptional control | |
| 650 | 4 | |a Urothelium | |
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