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Mitogen activated protein kinase-dependent activation of c-Jun and c-Fos is required for neuronal differentiation but not for growth and stress response in PC12 cells.
- Source :
-
Journal of Cellular Physiology . Feb2007, Vol. 210 Issue 2, p538-548. 11p. 6 Graphs. - Publication Year :
- 2007
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Abstract
- MAPK-dependent activation of AP-1 protein c-Jun is involved in PC12 cell differentiation and apoptosis. However, the role of other AP-1 proteins and their connection to MAPKs during growth, differentiation and apoptosis has remained elusive. Here we studied the activation of AP-1 proteins in response to ERK, JNK, and p38 signaling upon NGF, EGF and anisomycin exposures. All treatments caused different kinetics and strength of MAPK and AP-1 activities. NGF induced persistent ERK and AP-1 activities, whereas upon EGF and anisomycin exposures, their activities were only weakly and transiently induced. The sustained AP-1 activity was associated with concomitant c-Fos and c-Jun expression and phoshorylation, which were JNK and ERK dependent. While inhibition of the ERK, JNK, and p38 activities partially prevented AP-1 activity and suppressed differentiation, none of them was required for anisomycin-induced apoptosis. The importance of c-Fos and c-Jun as mediators of differentiation was demonstrated by the findings that the corresponding siRNAs suppressed NGF-induced neurite outgrowth. However, the capacity of c-Fos to promote differentiation required cooperation with Jun proteins. In contrast, Fra-2 expression was not required for the differentiation response. Together, the results show that sustained c-Jun and c-Fos activities mediate MAPK signaling and are essential for differentiation of PC12 cells. J. Cell. Physiol. 210: 538–548, 2007. © 2006 Wiley-Liss, Inc. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219541
- Volume :
- 210
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Cellular Physiology
- Publication Type :
- Academic Journal
- Accession number :
- 23289309
- Full Text :
- https://doi.org/10.1002/jcp.20907