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A novel effect of EGF on mRNA stability
Y Jinno1, G T Merlino, I Pastan
1Laboratory of Molecular Biology, National Cancer Institute, Bethesda, MD 20892.
Nucleic Acids Research
|June 10, 1988
Summary
Epidermal growth factor (EGF) stabilizes EGF receptor mRNA, increasing its levels. Unlike PMA, EGF prolongs mRNA half-life, suggesting a key mechanism for gene regulation.
Area of Science:
- Molecular Biology
- Cell Signaling
- Gene Expression Regulation
Background:
- Epidermal Growth Factor (EGF) receptor gene expression is modulated by EGF and phorbol esters like PMA.
- Understanding the post-transcriptional regulation of EGF receptor mRNA is crucial for comprehending cellular responses.
Purpose of the Study:
- To investigate the mechanisms by which EGF and PMA influence EGF receptor mRNA levels.
- To determine the impact of EGF and PMA on the stability and degradation rates of EGF receptor mRNA.
Main Methods:
- Treatment of human KB epidermoid carcinoma cells with EGF and PMA.
- Measurement of EGF receptor mRNA levels.
- Assessment of mRNA half-life using actinomycin D to inhibit transcription.
Main Results:
- PMA increased EGF receptor mRNA levels without significantly altering mRNA half-life.
- EGF significantly prolonged the half-life of EGF receptor mRNA.
- EGF also stabilized beta-tubulin and beta-actin mRNAs, with minimal impact on total mRNA degradation.
Conclusions:
- EGF-induced stabilization of EGF receptor mRNA represents a primary mechanism for increasing its levels.
- Differential regulation of mRNA stability by signaling molecules like EGF plays a critical role in gene expression control.
- EGF exhibits broad effects on mRNA stability beyond the EGF receptor.