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Monoacylated Cellular Prion Proteins Reduce Amyloid-β-Induced Activation of Cytoplasmic Phospholipase A2 and Synapse
Ewan West1, Craig Osborne2, William Nolan3
1Department of Pathology and Pathogen Biology, Royal Veterinary College, Hawkshead Lane, North Mymms, Herts AL97TA, UK. ejwest@rvc.ac.uk.
Abstract:
Alzheimer's disease (AD) is a progressive neurodegenerative disease characterized by the accumulation of amyloid-β (Aβ) and the loss of synapses. Aggregation of the cellular prion protein (PrPC) by Aβ oligomers induced synapse damage in cultured neurons. PrPC is attached to membranes via a glycosylphosphatidylinositol (GPI) anchor, the composition of which affects protein targeting and cell signaling. Monoacylated PrPC incorporated into neurons bound "natural Aβ", sequestering Aβ outside lipid rafts and preventing its accumulation at synapses. The presence of monoacylated PrPC reduced the Aβ-induced activation of cytoplasmic phospholipase A2 (cPLA2) and Aβ-induced synapse damage. This protective effect was stimulus specific, as treated neurons remained sensitive to α-synuclein, a protein associated with synapse damage in Parkinson's disease. In synaptosomes, the aggregation of PrPC by Aβ oligomers triggered the formation of a signaling complex containing the cPLA2.a process, disrupted by monoacylated PrPC. We propose that monoacylated PrPC acts as a molecular sponge, binding Aβ oligomers at the neuronal perikarya without activating cPLA2 or triggering synapse damage.
Insights
Modified prion protein (PrPC) prevents amyloid-β (Aβ) from damaging synapses in Alzheimer's disease (AD). Monoacylated PrPC acts as a molecular sponge, binding Aβ and protecting neurons without triggering harmful signaling pathways.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- Alzheimer's disease (AD) involves amyloid-β (Aβ) accumulation and synapse loss.
- Oligomeric Aβ aggregates cellular prion protein (PrPC), causing synapse damage.
- PrPC's glycosylphosphatidylinositol (GPI) anchor influences its function.
Purpose of the Study:
- To investigate the protective role of monoacylated PrPC against Aβ-induced synapse damage.
- To elucidate the mechanism by which monoacylated PrPC confers neuroprotection.
Main Methods:
- Utilized cultured neurons and synaptosomes.
- Incorporated monoacylated PrPC into neuronal membranes.
- Assessed Aβ binding, lipid raft localization, and signaling pathway activation (cPLA2).
Main Results:
- Monoacylated PrPC sequestered Aβ outside lipid rafts, preventing synaptic accumulation.
- Reduced Aβ-induced cytoplasmic phospholipase A2 (cPLA2) activation and synapse damage.
- Demonstrated stimulus specificity, with no effect on α-synuclein-induced damage.
Conclusions:
- Monoacylated PrPC acts as a neuroprotective agent by binding Aβ oligomers.
- This interaction prevents pathological signaling and synapse damage in Alzheimer's disease models.
- The GPI anchor modification is crucial for PrPC's protective function.
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