期刊
BMC MOLECULAR BIOLOGY
卷 17, 期 -, 页码 -出版社
BMC
DOI: 10.1186/s12867-016-0063-y
关键词
STAT5; c-Myc; BET; BRD2; Super-enhancer; Chromatin
资金
- Deutsche Forschungsgemeinschaft [RA 2010/2-1]
- Deutsche Krebshilfe [109750]
- Foerderlinie C
- Frauenfoerderung, Bayerisches Programm zur Realisierung der Chancengleichheit fuer Frauen in Forschung und Lehre
Background: c-Myc has been proposed as a putative target gene of signal transducer and activator of transcription 5 (STAT5). No functional STAT5 binding site has been identified so far within the c-Myc gene locus, therefore a direct transcriptional regulation by STAT5 remains uncertain. c-Myc super-enhancer, located 1.7 Mb downstream of the c-Myc gene locus, was recently reported as essential for the regulation of c-Myc gene expression by hematopoietic transcription factors and bromodomain and extra-terminal (BET) proteins and for leukemia maintenance. c-Myc super-enhancer is composed of five regulatory regions (E1-E5) which recruit transcription and chromatin-associated factors, mediating chromatin looping and interaction with the c-Myc promoter. Results: We now show that STAT5 strongly binds to c-Myc super-enhancer regions E3 and E4, both in normal and transformed Ba/F3 cells. We also found that the BET protein bromodomain-containing protein 2 (BRD2), a co-factor of STAT5, co-localizes with STAT5 at E3/E4 in Ba/F3 cells transformed by the constitutively active STAT5-1*6 mutant, but not in non-transformed Ba/F3 cells. BRD2 binding at E3/E4 coincides with c-Myc transcriptional activation and is lost upon treatment with deacetylase and BET inhibitors, both of which inhibit STAT5 transcriptional activity and c-Myc gene expression. Conclusions: Our data suggest that constitutive STAT5 binding to c-Myc super-enhancer might contribute to BRD2 maintenance and thus allow sustained expression of c-Myc in Ba/F3 cells transformed by STAT5-1*6.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据