Related Experiment Videos
STAT5-Dependent CyclinD1 and Bcl-xL expression in Bcr-Abl-transformed cells
R P de Groot1, J A Raaijmakers, J W Lammers
1Department of Pulmonary Diseases, University Medical Center Utrecht, Utrecht, The Netherlands. r.p.de.groot@sron.nl1
Molecular Cell Biology Research Communications : MCBRC
|August 31, 2000
Summary
Signal transducers and activators of transcription (STAT5) promote cancer by activating antiapoptotic and cell cycle genes. STAT5 targets bcl-xL and cyclin D1 in Bcr-Abl transformed cells, suggesting a role in cellular transformation.
Area of Science:
- Molecular Biology
- Oncology
- Cellular Biology
Background:
- Signal transducers and activators of transcription (STATs) mediate cytokine signaling.
- STAT5 is implicated in cellular transformation driven by the Bcr-Abl oncogene.
Purpose of the Study:
- To investigate the role of STAT5 in regulating target genes in Bcr-Abl-transformed cells.
- To identify specific genes regulated by STAT5 in the context of Bcr-Abl-mediated transformation.
Main Methods:
- Analysis of cyclin D1 and bcl-x promoter activity in K562 and BaF3 cells.
- Use of dominant-negative STAT5 mutants to assess promoter regulation.
- Identification of STAT binding sites and STAT5 binding in Bcr-Abl transformed cells.
Main Results:
- Bcr-Abl transformation leads to high activity of cyclin D1 and bcl-x promoters.
- STAT5 constitutively binds to STAT binding sites within these promoters.
- Dominant-negative STAT5 represses cyclin D1 and bcl-x promoter activity.
Conclusions:
- STAT5 directly induces the expression of cyclin D1 and bcl-xL in Bcr-Abl-transformed cells.
- STAT5 plays a critical role in Bcr-Abl-mediated cellular transformation through these target genes.