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Analysis of the c-KIT Ligand Promoter Using Chromatin Immunoprecipitation
Published on: June 27, 2017
CREB, another culprit for TIGAR promoter activity and expression
Shubiao Zou1, Xiaozhong Wang, Linqiang Deng
1Department of Laboratory Medicine, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, PR China.
Biochemical and Biophysical Research Communications
|September 17, 2013
Summary
The CREB protein binds to the TIGAR promoter, regulating its expression. This finding clarifies how the TP53-induced glycolysis and apoptosis regulator (TIGAR) is controlled at the cellular level.
Area of Science:
- Molecular Biology
- Cellular Regulation
- Gene Expression Analysis
Background:
- The TP53-induced glycolysis and apoptosis regulator (TIGAR) protein plays a crucial role in down-regulating glycolysis, reducing reactive oxygen species, and preventing apoptosis.
- Despite its significance, the regulatory mechanisms controlling TIGAR expression are not well understood.
Purpose of the Study:
- To elucidate the molecular mechanisms governing the regulation of TIGAR gene expression.
- To identify specific transcription factors and promoter elements involved in TIGAR regulation.
Main Methods:
- Bioinformatic analysis of the TIGAR promoter region for conserved elements.
- 5'-deletion analysis and site-directed mutagenesis to identify functional promoter regions.
- Electrophoretic mobility shift assay (EMSA) and chromatin immunoprecipitation (ChIP) to confirm protein-DNA interactions.
- CREB knockdown and overexpression studies to assess its role in TIGAR regulation.
Main Results:
- Bioinformatic analysis revealed high conservation in the TIGAR promoter region across species.
- A cAMP-response element (CRE) was identified within the -4/+13 region of the TIGAR promoter.
- CRE-binding protein (CREB) was shown to bind to this CRE site.
- Knockdown of CREB significantly decreased TIGAR promoter activity and expression.
- Overexpression of CREB or forskolin (a CREB activator) enhanced TIGAR promoter activity and expression.
Conclusions:
- CREB directly regulates TIGAR expression through a specific CRE binding site on the TIGAR promoter.
- This study elucidates a key regulatory pathway for TIGAR, impacting cellular glycolysis and apoptosis.
- The findings provide a molecular basis for understanding TIGAR's role in cellular homeostasis.
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