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PU.1 regulates the CXCR1 promoter
1Department of Physiology and Biophysics and Sealy Center for Molecular Science. University of Texas Medical Branch, Galveston, Texas 77555-0641, USA.
The Journal of Biological Chemistry
|December 29, 1998
Summary
This study identifies the transcription factor PU.1 as a key regulator of the interleukin-8 receptor CXCR1 gene. These findings reveal a novel mechanism for controlling neutrophil chemoattractant receptor expression.
Area of Science:
- Molecular Biology
- Immunology
- Genetics
Background:
- Interleukin-8 receptors (CXCR1 and CXCR2) are crucial for neutrophil function.
- These receptors are highly expressed in neutrophil lineage cells, mediating inflammatory responses.
Purpose of the Study:
- To identify promoter elements regulating the CXCR1 gene.
- To determine the role of the transcription factor PU.1 in CXCR1 gene activation.
Main Methods:
- Reporter gene assays using CXCR1 upstream sequences (-800 to +86 bp).
- Analysis of DNA-protein interactions to identify PU.1 binding sites.
- Demonstration of PU.1's transactivation activity on the CXCR1 promoter.
Main Results:
- The CXCR1 promoter (-800 to +86 bp) drives myeloid-specific gene expression.
- Negative regulatory elements were found between -800 and -128 bp, and positive elements between -128 and +50 bp.
- The transcription factor PU.1 binds to the -22 to +14 bp fragment and transactivates the CXCR1 promoter.
Conclusions:
- PU.1 is a major regulator of CXCR1 gene transcription.
- This is the first demonstration of PU.1-mediated regulation of a neutrophil chemoattractant G protein-coupled receptor.