Cell survival promoted by the Ras-MAPK signaling pathway by transcription-dependent and -independent mechanisms.
A mechanism by which the Ras-mitogen-activated protein kinase (MAPK) signaling pathway mediates growth factor-dependent cell survival was characterized. The MAPK-activated kinases, the Rsks, catalyzed the phosphorylation of the pro-apoptotic protein BAD at serine 112 both in vitro and in vivo. The Rsk-induced phosphorylation of BAD at serine 112 suppressed BAD-mediated apoptosis in neurons. Rsks also are known to phosphorylate the transcription factor CREB (cAMP response element-binding protein) at serine 133. Activated CREB promoted cell survival, and inhibition of CREB phosphorylation at serine 133 triggered apoptosis. These findings suggest that the MAPK signaling pathway promotes cell survival by a dual mechanism comprising the posttranslational modification and inactivation of a component of the cell death machinery and the increased transcription of pro-survival genes.
Duke Scholars
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- ras Proteins
- bcl-Associated Death Protein
- Transfection
- Transcription, Genetic
- Ribosomal Protein S6 Kinases
- Recombinant Fusion Proteins
- Rats, Long-Evans
- Rats
- Protein Serine-Threonine Kinases
- Phosphoserine
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- ras Proteins
- bcl-Associated Death Protein
- Transfection
- Transcription, Genetic
- Ribosomal Protein S6 Kinases
- Recombinant Fusion Proteins
- Rats, Long-Evans
- Rats
- Protein Serine-Threonine Kinases
- Phosphoserine