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The JNK pathway amplifies and drives subcellular changes in tau phosphorylation
1Discovery Neuroscience, Wyeth Research, CN8000, Princeton, NJ 08543, USA.
Neuropharmacology
|July 25, 2009
Summary
This study reveals how the JNK pathway, particularly JNK3, influences tau phosphorylation in Alzheimer's Disease models. Findings show JNK3 can self-phosphorylate, impacting tau and other targets in the central nervous system (CNS).
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Neurofibrillary tangles of hyperphosphorylated tau are key in Alzheimer's Disease (AD).
- Understanding tau regulation is crucial for developing AD therapeutics.
- The c-Jun N-terminal kinase (JNK) pathway is implicated in tau phosphorylation.
Purpose of the Study:
- To investigate the role of the JNK pathway in tau phosphorylation using Okadaic acid (OA) in cultured neurons.
- To quantitatively assess the spatiotemporal profile of proteins involved in tau pathology.
- To explore the autophosphorylation capacity of JNK3 and its implications in the CNS.
Main Methods:
- Primary cultured hippocampal neurons treated with Okadaic acid (OA).
- High-content screening for quantitative protein analysis.
- In vitro phosphorylation experiments with JNK3.
Main Results:
- Okadaic acid treatment induced significant and inhibitable changes in tau phosphorylation and related proteins.
- High-content screening provided a high-resolution spatiotemporal profile of these changes.
- JNK3 demonstrated strong autophosphorylation in vitro, suggesting sustained signaling capacity.
Conclusions:
- The JNK pathway, especially JNK3, plays a significant role in regulating tau phosphorylation in neurons.
- JNK3's autophosphorylation capability has implications for sustained signaling towards tau and apoptotic pathways in the CNS.
- These findings offer novel insights into JNK pathway dynamics and tau pathology in neurological disorders.
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