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Munc13-1-mediated vesicle priming contributes to secretory amyloid precursor protein processing
Steffen Rossner1, Katrin Fuchsbrunner, Christine Lange-Dohna
1Paul Flechsig Institut für Hirnforschung, Abteilung Neurochemie, Universität Leipzig, Jahnallee 59, D-04109 Leipzig, Germany. rossn@medizin.uni-leipzig.de
The Journal of Biological Chemistry
|May 5, 2004
Summary
Protein kinase Cs (PKCs) and Munc13-1 both regulate amyloid precursor protein (APP) processing. Munc13-1, a protein involved in synaptic vesicle priming, also significantly impacts APP metabolism, alongside PKCs.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Amyloid precursor protein (APP) processing is central to Alzheimer's disease pathogenesis, forming beta-amyloid plaques.
- Non-amyloidogenic APP processing can be enhanced by phorbol esters (PEs) and diacylglycerol (DAG).
- Protein kinase Cs (PKCs) are known DAG/PE activators hypothesized to regulate APP processing.
Purpose of the Study:
- To investigate the roles of PKCs and Munc13-1 in regulating phorbol ester-stimulated secretory APP processing.
- To determine the relative contributions of PKCs versus Munc13-1 in modulating APP metabolism.
Main Methods:
- Utilized Munc13-1 knock-out mouse models.
- Employed knock-in mice expressing a Munc13-1(H567K) variant with impaired DAG/PE binding.
- Assessed PE-stimulated secretory APP processing in these models.
Main Results:
- Confirmed that PKCs play a role in PE-stimulated APP processing.
- Demonstrated that Munc13-1 significantly contributes to the regulation of secretory APP metabolism.
- Established Munc13-1 as an alternative DAG/PE target influencing APP processing.
Conclusions:
- Munc13-1 is a significant regulator of secretory APP processing, independent of or in concert with PKCs.
- This finding expands the understanding of molecular pathways involved in APP metabolism and potential therapeutic targets for Alzheimer's disease.