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P38 activation mediates amyloid-beta cytotoxicity.
Xiongwei Zhu1, Matthew Mei, Hyoung-Gon Lee
1Institute of Pathology, Case Western Reserve University, 2085 Adelbert Road, Cleveland, Ohio 44106, USA. Xiongwei.Zhu@case.edu
Neurochemical Research
|September 28, 2005
Summary
Amyloid-beta causes neuronal damage in Alzheimer disease (AD) via oxidative stress and p38 activation. Inhibiting p38 significantly reduced this toxicity, suggesting a therapeutic target for AD.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Alzheimer disease (AD) is linked to amyloid-beta, but mechanisms remain unclear.
- Amyloid-beta-induced neuronal damage is associated with oxidative stress.
- Stress-activated protein kinases (SAPKs), including p38, are implicated in AD pathogenesis.
Purpose of the Study:
- To investigate the role of p38 activation in amyloid-beta-induced neuronal cell death.
- To determine if blocking p38 activity can mitigate amyloid-beta toxicity.
Main Methods:
- Exposure of M17 human neuroblastoma cells and primary cortical neurons to amyloid-beta.
- Assessment of p38 activation in response to amyloid-beta.
- Inhibition of p38 activity using dominant-negative p38 expression and a specific inhibitor (SB203580).
Main Results:
- Amyloid-beta induced p38 activation in a concentration-dependent manner.
- Inhibition of p38 significantly decreased amyloid-beta-induced cytotoxicity in both cell models.
- Blocking p38 pathway diminished amyloid-beta toxicity in primary neurons.
Conclusions:
- p38 acts as a key downstream mediator of amyloid-beta-induced neuronal death.
- Targeting the p38 pathway presents a potential therapeutic strategy for Alzheimer disease.