期刊论文详细信息
Non-Coding RNA
Truncated Isoforms of lncRNA ANRIL Are Overexpressed in Bladder Cancer, But Do Not Contribute to Repression of INK4 Tumor Suppressors
Michèle J. Hoffmann1  Judith Dehn1  Johanna Droop1  Günter Niegisch1  Christian Niedworok2  Tibor Szarvas2  Wolfgang A. Schulz1 
[1] Department of Urology, Medical Faculty, Heinrich-Heine-University Düsseldorf, Germany; Moorenstrasse 5, Düsseldorf 40225, Germany; E-Mails:;Department of Urology, University of Duisburg-Essen, Hufelandstrasse 55, Essen 45147, Germany; E-Mails:
关键词: long noncoding RNA;    ANRIL;    p16;    p14;    p15;    INK4/ARF;    tumor suppressor;    polycomb;    bladder cancer;    PVT1;   
DOI  :  10.3390/ncrna1030266
来源: mdpi
PDF
【 摘 要 】

The INK4/ARF locus at chromosome 9p21 encoding p14ARF, p15INK4B and p16INK4A is a major tumor suppressor locus, constituting an important barrier for tumor growth. It is frequently inactivated in cancers, especially in urothelial carcinoma (UC). In addition to deletions and DNA hypermethylation, further epigenetic mechanisms might underlie its repression. One candidate factor is the long noncoding RNA ANRIL, which recruits Polycomb proteins (PcG) to regulate expression of target genes in cis and trans. We observed ANRIL overexpression in many UC tissues and cell lines mainly resulting from upregulation of 3’-truncated isoforms. However, aberrant ANRIL expression was neither associated with repression of INK4/ARF genes nor with proliferation activity or senescence. We wondered whether truncated ANRIL isoforms exhibit altered properties resulting in loss of function in cis. We excluded delocalization and performed RNA immunoprecipitation demonstrating interaction between full length or truncated ANRIL and PcG protein CBX7, but not SUZ12 of PRC2. Our data indicate that ANRIL in UC cells may not interact with PRC2, which is central for initializing gene repression. Thus, tissue-specific binding activities between ANRIL and PcG proteins may determine the regulatory function of ANRIL. In conclusion, ANRIL does not play a major role in repression of the INK4/ARF locus in UC.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.

【 预 览 】
附件列表
Files Size Format View
RO202003190001390ZK.pdf 1034KB PDF download
  文献评价指标  
  下载次数:21次 浏览次数:14次