Amyloid β oligomers suppress excitatory transmitter release via presynaptic depletion of phosphatidylinositol-4,5-bisphosphate.
Yang HeMengdi WeiYan WuHuaping QinWeinan LiXiaolin MaJingjing ChengJinshuai RenYe ShenZhong ChenBinggui SunFu-De HuangYi ShenYu-Dong ZhouPublished in: Nature communications (2019)
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 Aβ42 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 (PIP2) in axons. Selectively inhibiting Aβ-induced PIP2 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-PIP2 pathway whereby oligomeric Aβ induces early synaptic deficits in AD.
Keyphrases
- high glucose
- early stage
- diabetic rats
- wild type
- mouse model
- traumatic brain injury
- protein kinase
- drug induced
- signaling pathway
- oxidative stress
- endothelial cells
- metabolic syndrome
- gene expression
- radiation therapy
- adipose tissue
- prefrontal cortex
- spinal cord injury
- insulin resistance
- cognitive decline
- dna methylation
- stress induced
- subarachnoid hemorrhage