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Nerve growth factor regulates gene expression by several distinct mechanisms
K O Cho1, W C Skarnes, B Minsk
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts.
Molecular and Cellular Biology
|January 1, 1989
Summary
Nerve growth factor (NGF) regulates gene expression through multiple mechanisms, affecting distinct genes like d-2 and d-5 differently. Other growth factors also influence these NGF-inducible genes, revealing complex signaling pathways.
Area of Science:
- Molecular Biology
- Neuroscience
- Cell Signaling
Background:
- Nerve growth factor (NGF) is crucial for neuronal development and survival.
- Understanding NGF's gene regulation mechanisms is key to elucidating neural differentiation.
- PC12 cells are a standard model for studying NGF's effects on gene expression.
Purpose of the Study:
- Identify and characterize genes regulated by NGF in PC12 cells.
- Investigate the distinct mechanisms of NGF-mediated gene regulation.
- Explore the roles of other growth factors and signaling pathways in regulating these genes.
Main Methods:
- Gene expression analysis in PC12 cells treated with NGF and other stimuli.
- Identification of NGF-inducible genes (a-2, d-2, d-4, d-5).
- Assessment of transcriptional and post-transcriptional regulation.
Main Results:
- NGF positively regulates at least four genes (a-2, d-2, d-4, d-5) via multiple mechanisms.
- Three genes show rapid transcriptional induction with distinct kinetics; one (d-4) suggests post-transcriptional regulation.
- Gene expression is also influenced by cyclic AMP, other growth factors (FGF, EGF), and signaling inhibitors, indicating shared pathways.
Conclusions:
- NGF employs diverse strategies to regulate gene expression, including transcriptional and post-transcriptional control.
- The identified NGF-inducible genes are responsive to various growth factors, highlighting convergent signaling.
- These findings provide insights into the complex molecular events underlying NGF-induced neural differentiation.