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Divergence in the upstream signaling of nerve growth factor (NGF) and epidermal growth factor (EGF)
1Skirball Institute of Biomolecular Medicine, New York University School of Medicine, NY 10016, USA.
Abstract:
The early response of mammalian cells to growth factors consists of a combination of protein assemblages and kinase cascades. In the study of how signal specificity of different growth factors is determined, PC12 cells represent an elective experimental model to compare the signaling of differentiative nerve growth factor (NGF) and mitogenic epidermal growth factor (EGF). Focusing on Shc as established regulator of the Ras-ERK cascade, whose sustained activation is known to critically shape the neuronal differentiation of PC12 cells, the present manuscript describes two novel sources of divergence in the signaling of NGF and EGF: a differential phosphorylation of p66-Shc at early time points and a differential duration in the recruitment of the overall pool of Shc.
Insights
Nerve growth factor (NGF) and epidermal growth factor (EGF) signaling in PC12 cells diverge through differential p66-Shc phosphorylation and Shc protein recruitment duration. This impacts the Ras-ERK cascade, crucial for neuronal differentiation.
Area of Science:
- Cellular signaling pathways
- Molecular biology
- Neuroscience
Background:
- Mammalian cells utilize protein assemblies and kinase cascades for early responses to growth factors.
- PC12 cells are a model system for studying growth factor signaling specificity.
- Shc proteins regulate the Ras-ERK cascade, essential for neuronal differentiation.
Purpose of the Study:
- To investigate novel divergence points in nerve growth factor (NGF) and epidermal growth factor (EGF) signaling.
- To compare the signaling specificity of NGF and EGF in PC12 cells.
- To elucidate the role of Shc protein regulation in differential growth factor responses.
Main Methods:
- Utilized PC12 cell models to compare NGF and EGF signaling.
- Focused on the phosphorylation status of p66-Shc at early time points.
- Analyzed the temporal recruitment of the Shc protein pool.
Main Results:
- Identified differential phosphorylation of p66-Shc in response to NGF versus EGF.
- Observed distinct durations in the recruitment of the total Shc protein pool by NGF and EGF.
- These differences contribute to the distinct signaling outcomes of NGF and EGF.
Conclusions:
- Differential p66-Shc phosphorylation and Shc recruitment kinetics represent key mechanisms for NGF/EGF signal divergence.
- These findings enhance understanding of how Shc regulates Ras-ERK pathway specificity.
- Provides insights into the molecular basis of neuronal differentiation versus mitogenesis in PC12 cells.