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Regulation of the tissue factor gene
1Department of Immunology, Scripps Research Institute, La Jolla, California 92037, USA.
Summary
Tissue factor (TF) gene expression is cell-specific, initiating thrombosis in diseases. Its regulation involves distinct promoter regions and transcription factors like AP-1, kappa B, and Egr-1/Sp1, depending on cell type.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Tissue factor (TF) gene expression is crucial for initiating thrombotic events in diseases like atherosclerosis, septic shock, and cancer.
- TF is constitutively expressed in extravascular cells and inducibly in vascular monocytes and endothelial cells.
Purpose of the Study:
- To identify regulatory elements and transcription factors controlling human TF gene expression in different cell types.
- To elucidate the mechanisms of TF gene induction in response to specific stimuli.
Main Methods:
- Functional analysis using TF promoter-luciferase gene plasmids and transient transfection.
- Identification of transcription factors via gel shift mobility assays.
- Investigating promoter activity in human monocytic, endothelial, and epithelial cells.
Main Results:
- TF gene induction in monocytes/endothelial cells involves a distal enhancer with AP-1 and kappa B sites, requiring Fos-Jun and c-Rel-p65 heterodimers.
- TF gene induction in epithelial cells is controlled by a proximal enhancer with Egr-1/Sp1 binding sites, with Sp1 mediating basal activity.
- TF gene expression demonstrates complex regulation by multiple transcription factors binding to distinct promoter regions.
Conclusions:
- Human TF gene expression is tightly regulated by distinct promoter elements and transcription factor interactions, varying by cell type and stimulus.
- Understanding TF gene regulation provides insights into thrombotic disease mechanisms and potential therapeutic targets.