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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Chen, Mei-Chih Lin, Ho Hsu, Fu-Ning Huang, Pao-Hsuan Lee, Guan-Shun Wang, Paulus S. |
| Description | Country affiliation: China Author Affiliation: Chen MC ( Dept. of Physiology, School of Medicine, National Yang Ming University, Taipei 11221, Taiwan, Republic of China.) |
| Abstract | The signaling mechanisms underlying cell differentiation have been extensively studied with the use of rat PC12 cells as a model system. Nerve growth factor (NGF) is a trophic factor inducing PC12 cell differentiation through the activation of the p35/cyclin-dependent kinase 5 (Cdk5) complex. It has been reported that adenylyl cyclase activation and cAMP production may be involved in NGF-dependent actions. Our previous results indicate that cAMP activates the p35/Cdk5 complex in reproductive cells. Therefore, the role of cAMP in NGF-triggered p35/Cdk5 activation and PC12 differentiation was interesting to explore. Our results indicate that roscovitine, a molecular inhibitor of Cdk5, blocks cAMP-triggered PC12 differentiation, which was evaluated by neurite initiation, a decrease in proliferation, and cell cycle G(1) arrest. The following data show that cAMP treatment increased Cdk5 activity through p35 upregulation. cAMP downstream components, protein kinase A (PKA) and phosphorylated cAMP response element binding protein (CREB), are involved in this regulation. The immunocytochemical results indicate that PKA inhibition disrupted cAMP-triggered p35/Cdk5 localization in PC12 cells. In addition, adenylyl cyclase inhibition was found to diminish NGF-induced intracellular cAMP production, CREB phosphorylation, and p35 expression. The cAMP antagonist and the PKA inhibitors reduced NGF-induced p35 expression. Finally, NGF-triggered PC12 differentiation was partially decreased by adenylyl cyclase or PKA inhibitors. In conclusion, these results demonstrate that cAMP may play a role in NGF-p35/Cdk5-dependent PC12 differentiation. |
| File Format | HTM / HTML |
| ISSN | 03636143 |
| e-ISSN | 15221563 |
| Journal | American Journal of Physiology - Cell Physiology |
| Issue Number | 2 |
| Volume Number | 299 |
| Language | English |
| Publisher | American Physiological Society |
| Publisher Date | 2010-08-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Cell Biology Cell Differentiation Physiology Cyclic Amp Pharmacology Cyclin-dependent Kinase 5 Metabolism Nerve Growth Factor Phosphotransferases Animals Drug Effects Cells, Cultured Antagonists & Inhibitors Enzyme Activation Neurites Enzymology Pc12 Cells Purines Comparative Study Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Physiology |
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