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Nerve growth factor (NGF) induces increase in multi-ubiquitin chains and concomitant decrease in free ubiquitin in
R Ohtani-Kaneko1, M Asahara, K Takada
1Department of Anatomy, St. Marianna University School of Medicine, Kanagawa, Japan.
Neuroscience Research
|December 1, 1996
Summary
Nerve growth factor (NGF) treatment increases ubiquitin in PC12h cell nuclei, indicating enhanced multi-ubiquitination of nuclear proteins during neuronal differentiation.
Area of Science:
- Cell Biology
- Neuroscience
- Biochemistry
Background:
- Nerve growth factor (NGF) is crucial for neuronal development and survival.
- Ubiquitination is a key post-translational modification involved in protein regulation.
Purpose of the Study:
- To investigate changes in ubiquitin-immunoreactivity in PC12h cells following NGF treatment.
- To determine the specific alterations in free ubiquitin and multi-ubiquitin chains in different cellular compartments.
Main Methods:
- PC12h cells were treated with NGF.
- Ubiquitin-immunoreactivity was assessed using immunofluorescence.
- Levels of free ubiquitin and multi-ubiquitin chains were quantified using radioimmunoassay (RIA) and enzyme-linked immunosorbent assay (ELISA).
- Subcellular fractionation was performed to analyze nuclear and cytoplasmic extracts.
Main Results:
- NGF treatment led to increased ubiquitin-immunoreactivity in the nucleus of PC12h cells.
- Quantitative analysis showed a significant increase in ubiquitin-immunoreactive nuclei after 7 days of NGF treatment.
- A decrease in free ubiquitin was observed in water-soluble cytoplasmic extracts.
- An increase in multi-ubiquitin chains and a decrease in free ubiquitin were detected in water-soluble nuclear extracts.
Conclusions:
- NGF-induced neuronal differentiation in PC12h cells is associated with increased multi-ubiquitination of nuclear proteins.
- These findings highlight the role of ubiquitin modification in NGF-mediated cellular processes.