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A c-Jun dominant negative mutant protects sympathetic neurons against programmed cell death
1Eisai London Research Laboratories, University College London, United Kingdom.
Neuron
|May 1, 1995
Summary
Nerve growth factor (NGF) withdrawal triggers sympathetic neuron apoptosis, primarily through increased c-Jun transcription factor activity. This AP-1 pathway is crucial for neuronal cell death, as blocking c-Jun prevents it, while its overexpression induces it.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Sympathetic neurons require nerve growth factor (NGF) for survival.
- Absence of NGF leads to programmed cell death (apoptosis) in these neurons.
Purpose of the Study:
- To investigate the role of Jun and Fos transcription factors in NGF-deprived sympathetic neuron apoptosis.
- To determine the specific contribution of c-Jun to neuronal cell death pathways.
Main Methods:
- Utilized antibodies specific to Jun and Fos family members to analyze protein expression patterns.
- Employed microinjection of c-Jun dominant-negative mutants and full-length c-Jun expression vectors.
- Assessed neuronal survival and apoptosis following NGF withdrawal and genetic manipulation.
Main Results:
- NGF deprivation significantly increased c-Jun protein levels and phosphorylation in sympathetic neurons.
- Other Jun and Fos family members showed relatively constant expression.
- Blocking c-Jun activity with a dominant-negative mutant protected neurons from NGF withdrawal-induced death.
- Overexpression of full-length c-Jun alone induced apoptosis in sympathetic neurons.
Conclusions:
- AP-1 transcription factor activity, specifically mediated by c-Jun, is essential for NGF withdrawal-induced sympathetic neuron apoptosis.
- c-Jun plays a critical role in initiating and executing programmed cell death in these neurons.