Papillomavirus-Associated Tumor Formation Critically Depends on c-Fos Expression Induced by Viral Protein E2 and Bromodomain Protein Brd4
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Summary
This summary is machine-generated.Papillomavirus E2 protein activates oncogene promoters by inducing c-Fos expression via Brd4. This mechanism is crucial for papillomavirus-induced skin tumorigenesis.
Area Of Science
- Molecular Biology
- Virology
- Oncology
Background
- Papillomavirus E2 protein is a key regulator of viral gene expression.
- Activator protein 1 (AP1) binding sites are frequently found in viral promoters.
- The precise mechanism by which E2 activates promoters via AP1 sites remains unclear.
Purpose Of The Study
- To elucidate the mechanism of papillomavirus E2-mediated promoter activation through AP1 binding sites.
- To investigate the role of E2, AP1 components, and Brd4 in papillomavirus-induced tumorigenesis.
Main Methods
- Inducible cell line expressing E2
- Transcriptome analysis
- In vitro and in vivo RNA interference
- Mutation analysis
- Chromatin immunoprecipitation (ChIP) analysis
Main Results
- E2 induces c-Fos and FosB expression in a Brd4-dependent manner.
- c-Fos, an AP1 component, drives the expression of viral oncogenes E6/E7.
- c-Fos/AP1 and Brd4 are essential for papillomavirus-induced tumorigenesis.
- E2 and Brd4 co-localize at the c-Fos promoter's E2 binding site (E2BS).
Conclusions
- E2 activates viral oncogene promoters by inducing c-Fos expression through Brd4.
- E2 may function as a viral oncogene by directly activating c-Fos, contributing to skin tumorigenesis.