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Sp3 regulates fas expression in lung epithelial cells
1The Pulmonary Center, Boston University School of Medicine, 80 E. Concord Street, Boston, MA 02118, USA.
The Biochemical Journal
|June 26, 1998
Summary
Researchers identified Sp3 protein as a key regulator of Fas gene expression in lung epithelial cells. This finding is crucial for understanding cell turnover and immunological activity in these tissues.
Area of Science:
- Molecular Biology
- Immunology
- Cell Biology
Background:
- The Fas receptor plays a role in apoptosis and immune regulation.
- Evidence suggests Fas is also involved in epithelial cell turnover.
Purpose of the Study:
- To identify factors regulating Fas gene expression in epithelial cells.
- To characterize the promoter region of the mouse Fas gene in lung epithelial cells.
Main Methods:
- Isolation and characterization of the mouse Fas gene's 5' flanking region.
- Reporter assays (luciferase) in MLE-15 cells to map promoter activity.
- Electrophoretic mobility-shift assays (EMSA) and site-directed mutagenesis.
- Functional assays in Drosophila SL-2 cells with Sp3 expression constructs.
Main Results:
- Transcriptional start sites were identified near the translation start site.
- Promoter activity was localized to the first 77 bp of the upstream sequence.
- Sp3 protein was identified as a key transcription factor binding to the Fas promoter, influencing its activity.
Conclusions:
- Sp3 protein is a critical regulator of Fas gene expression in lung epithelial cells.
- Understanding this regulation is important for controlling cell turnover and immune responses in the lung.