Amyloid β oligomers suppress excitatory transmitter release via presynaptic depletion of phosphatidylinositol-4,5-bisphosphate.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30867420.
- Also identified by DOI 10.1038/s41467-019-09114-z and PMC identifier 6416269.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Amyloid β (Aβ) oligomer-induced aberrant neurotransmitter release is proposed to be a crucial early event leading to synapse dysfunction in Alzheimer's disease (AD). In the present study, we report that the release probability (Pr) at the synapse between the Schaffer collateral (SC) and CA1 pyramidal neurons is significantly reduced at an early stage in mouse models of AD with elevated Aβ production. High nanomolar synthetic oligomeric Aβ<sub>42</sub> also suppresses Pr at the SC-CA1 synapse in wild-type mice. This Aβ-induced suppression of Pr is mainly due to an mGluR5-mediated depletion of phosphatidylinositol-4,5-bisphosphate (PIP<sub>2</sub>) in axons. Selectively inhibiting Aβ-induced PIP<sub>2</sub> hydrolysis in the CA3 region of the hippocampus strongly prevents oligomeric Aβ-induced suppression of Pr at the SC-CA1 synapse and rescues synaptic and spatial learning and memory deficits in APP/PS1 mice. These results first reveal the presynaptic mGluR5-PIP<sub>2</sub> pathway whereby oligomeric Aβ induces early synaptic deficits in AD.
Medical subject headings
- Alzheimer Disease
- Amyloid beta-Peptides
- CA1 Region, Hippocampal
- Peptide Fragments
- Phosphatidylinositol 4,5-Diphosphate
- Synapses