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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
PubMed
Summary

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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.

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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.