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Cytosolic prion protein in neurons
Alexander Mironov1, Diane Latawiec, Holger Wille
1The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands.
Summary
This study reveals the cellular prion protein (PrPC) localizes to late endosomes and neuronal plasma membranes. Unexpectedly, cytosolic PrP was found in specific neurons, potentially impacting prion disease pathogenesis.
Area of Science:
- Neuroscience
- Cell Biology
- Prion Biology
Background:
- Understanding prion protein (PrPC) localization is crucial for prion disease pathogenesis research.
- The precise ultrastructural localization of PrPC remains largely unknown.
Purpose of the Study:
- To quantitatively investigate the ultrastructural localization of PrPC in the mouse hippocampus.
- To elucidate the role of PrPC localization in neuronal compartments and potential involvement in disease.
Main Methods:
- High-resolution cryoimmunogold electron microscopy was employed.
- Quantitative analysis of PrPC distribution in neuronal compartments was performed.
Main Results:
- PrPC follows the standard biosynthetic pathway, localizing to late endosomes and neuronal plasma membranes.
- PrPC is present synaptically and perisynaptically but absent from synaptic vesicles.
- Cytosolic PrP was unexpectedly detected in subpopulations of neurons in the hippocampus, neocortex, and thalamus.
Conclusions:
- PrPC's localization suggests specific roles in neuronal trafficking and synaptic function.
- The presence of cytosolic PrP in certain neurons may indicate a novel mechanism contributing to prion disease pathogenesis, especially in cases with mutant PrP genes.