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Presenilin-binding protein forms aggresomes in monkey kidney COS-7 cells
Kazuhiko Namekata1, Noriyuki Nishimura, Hideo Kimura
1National Institute of Neuroscience, NCNP, Tokyo, Japan.
Journal of Neurochemistry
|October 3, 2002
Summary
A novel brain protein, PBP, forms aggresomes when proteasome function is impaired, suggesting a new mechanism in Alzheimer's disease (AD) pathogenesis.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Alzheimer's disease (AD) pathogenesis involves protein aggregation.
- Proteasomes degrade proteins, and their malfunction can lead to protein accumulation.
- Aggresomes are protein aggregates formed when degradation pathways are overwhelmed.
Purpose of the Study:
- To investigate the role of presenilin-binding protein (PBP) in protein aggregation.
- To determine if proteasome dysfunction causes PBP aggregation.
- To explore the potential link between PBP aggresomes and Alzheimer's disease.
Main Methods:
- Overexpression of PBP in COS-7 cells.
- Inhibition of proteasome activity using chemical inhibitors.
- Analysis of PBP aggregation in primary neuronal cultures.
- Characterization of PBP aggregates for aggresome markers.
Main Results:
- Overexpression of PBP or proteasome suppression induced detergent-insoluble, ubiquitinated PBP aggregates.
- PBP formed aggresomes in neurons treated with proteasome inhibitors.
- These PBP aggregates localized to microtubule organization centers and disrupted intermediate filaments.
Conclusions:
- Proteasome malfunction can lead to the formation of PBP aggresomes.
- PBP aggresomes may contribute to the pathogenesis of Alzheimer's disease.
- This study identifies a novel mechanism potentially linking proteasome dysfunction to AD.