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Activity-dependent increase in beta-amyloid precursor protein mRNA expression in neurons
Akiko Tabuchi1, Asami Ishii, Mamoru Fukuchi
1Department of Biological Chemistry, Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University, Sugitani 2630, Toyama 930-0194, Japan.
Neuroreport
|May 29, 2004
Summary
Beta-amyloid precursor protein (APP) mRNA expression in neurons is regulated by neuronal activity. High potassium levels increase APP mRNA, while reduced activity decreases it, highlighting activity-dependent control.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Beta-amyloid precursor protein (APP) is implicated in neuronal survival and plasticity.
- The regulation of APP mRNA expression by neuronal activity remains largely uncharacterized.
Purpose of the Study:
- To investigate the relationship between neuronal activity and APP mRNA expression in neurons.
- To elucidate the mechanisms underlying activity-dependent regulation of APP mRNA.
Main Methods:
- Primary cultures of mouse cerebellar granule cells were used.
- Neuronal activity was manipulated by altering extracellular potassium (K+) concentration.
- APP mRNA and protein levels were quantified.
- Calcium influx and protein synthesis pathways were examined.
Main Results:
- High potassium concentrations significantly increased APP mRNA levels.
- Depolarization-induced K+ deprivation reduced both APP mRNA expression and protein synthesis.
- Restoring high K+ concentrations restored APP mRNA expression.
- This regulation was dependent on calcium (Ca2+) influx via L-type voltage-dependent calcium channels and de novo protein synthesis.
Conclusions:
- APP mRNA expression in neurons is controlled in an activity-dependent manner.
- Neuronal activity, specifically membrane depolarization, modulates APP gene expression.
- Calcium signaling pathways are crucial for this activity-dependent regulation of APP.