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E1A dependent up-regulation of c-jun/AP-1 activity.
I Kitabayashi1, R Chiu, G Gachelin
1Tsukuba Life Science Center, Institute of Physical and Chemical Research (RIKEN), Ibaraki, Japan.
Nucleic Acids Research
|February 11, 1991
Summary
Human adenovirus E1A protein significantly boosts c-jun gene expression, increasing cell growth and oncogenic transformation potential. This regulation involves complex interactions with junB, impacting transcriptional control.
Area of Science:
- Molecular Biology
- Virology
- Cellular Biology
Background:
- Human adenovirus E1A protein regulates cellular gene expression, promoting cell growth and division.
- The precise mechanisms of E1A's regulatory functions on specific cellular genes are under investigation.
Purpose of the Study:
- To investigate the effect of E1A on c-jun and junB gene expression in rat 3Y1 cells.
- To elucidate the role of E1A-mediated transcriptional regulation in cellular processes.
Main Methods:
- Analysis of c-jun and junB gene expression in rat 3Y1 cells following E1A introduction.
- Assessing the binding activity of transcription factor cJun/AP1 to the c-jun promoter.
- Investigating the impact of junB expression on E1A-induced c-jun expression.
Main Results:
- E1A significantly induced c-jun expression (over 50-fold) independently of serum.
- E1A concurrently down-regulated junB expression.
- E1A enhanced the binding activity of cJun/AP1 to the c-jun promoter, increasing cJun/AP1 levels.
- Introducing junB repressed E1A-induced c-jun expression.
Conclusions:
- Differential expression of c-jun and junB by E1A expands cellular regulatory capabilities.
- E1A-induced c-jun expression and c-jun autoregulation may amplify E1A's effects during adenovirus infection.
- E1A may contribute to oncogenic transformation through constitutive activation of c-jun, a key factor in transcriptional regulation.