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Cross-talk between the Smad1 and Ras/MEK signaling pathways for TGFbeta
1Department of Pharmacology, Pennsylvania State University College of Medicine, Hershey 17033, USA.
Oncogene
|April 20, 1999
Summary
Ras signaling is crucial for transforming growth factor-beta (TGFbeta) to regulate RSmad1 in epithelial cells. The Ras/MEK pathway partially mediates TGFbeta
Area of Science:
- Cellular signaling pathways
- Molecular biology
- Cancer research
Background:
- Ras activation is essential for TGFbeta-mediated Erk1 activation and Cdk inhibitor upregulation.
- Previous studies established Ras's role in TGFbeta signaling pathways.
Purpose of the Study:
- To investigate the role of Ras in TGFbeta-mediated effects on RSmad1 in intestinal epithelial cells (IECs).
- To elucidate the involvement of the Ras/MEK pathway in TGFbeta and BMP signaling to RSmad1.
Main Methods:
- Utilized dominant-negative Ras (RasN17) to inactivate Ras signaling.
- Employed MEK inhibitor PD98059 to block the Ras/MEK pathway.
- Assessed RSmad1 phosphorylation and transcriptional activity using reporter assays (3TP-lux).
Main Results:
- Both TGFbeta and BMP induced Smad1 phosphorylation in IECs.
- Ras inactivation or MEK inhibition significantly reduced TGFbeta and BMP-induced Smad1 phosphorylation.
- Ras/MEK pathway inhibition impaired RSmad1's ability to regulate TGFbeta-responsive gene expression.
Conclusions:
- TGFbeta regulates RSmad1 function in epithelial cells.
- The Ras/MEK pathway is partially required for TGFbeta-mediated regulation of RSmad1.
- Findings highlight the interplay between Ras/MEK and TGFbeta signaling in epithelial cells.