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NGF-resistant PC12 cell death induced by arachidonic acid is accompanied by a decrease of active PKC zeta and nuclear
N J Macdonald1, J R Perez-Polo, A D Bennett
1Department of Human Biological Chemistry and Genetics, The University of Texas Medical Branch at Galveston, USA.
Journal of Neuroscience Research
|July 9, 1999
Summary
Inflammation, via arachidonic acid (AA), triggers neuronal apoptosis by inhibiting protein kinase C zeta (PKCzeta) and nuclear factor kappa B (NFkappaB). Nerve growth factor (NGF) cannot prevent AA-induced cell death, highlighting AA
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Neuroinflammation, involving tumor necrosis factor alpha (TNFalpha), is implicated in neurodegenerative diseases.
- Neuronal survival depends on trophic factors like nerve growth factor (NGF), which signals through TrkA and p75(NTR).
- p75(NTR) shares signaling similarities with TNFalpha receptor type 1 (TNFR-I), suggesting cross-talk in neuronal survival pathways.
Purpose of the Study:
- To investigate the role of arachidonic acid (AA), a lipid mediator, in neuronal apoptosis.
- To determine if AA interferes with nerve growth factor (NGF)-mediated neuroprotection.
- To elucidate the specific signaling pathways affected by AA in neuronal cells.
Main Methods:
- Utilized PC12 cells as a model system for neuronal apoptosis studies.
- Administered arachidonic acid (AA) to induce apoptosis.
- Assessed the impact of AA on protein kinase C zeta (PKCzeta) and nuclear factor kappa B (NFkappaB) activity.
- Evaluated the neuroprotective effect of nerve growth factor (NGF) against AA-induced apoptosis.
Main Results:
- Arachidonic acid (AA) induced apoptosis in PC12 cells.
- AA inhibited both protein kinase C zeta (PKCzeta) and nuclear factor kappa B (NFkappaB) activity.
- Nerve growth factor (NGF) failed to prevent AA-induced apoptosis.
- PKCzeta and NFkappaB are essential for NGF-mediated rescue from apoptosis.
Conclusions:
- Arachidonic acid (AA), potentially induced by TNFalpha, promotes neuronal apoptosis by inhibiting PKCzeta and NFkappaB.
- NGF-mediated neuroprotection relies on intact PKCzeta and NFkappaB signaling.
- AA may reduce neuronal survival by disrupting NGF signaling pathways, contributing to neurodegeneration.