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Synaptic Adhesion Molecule Pcdh-γC5 Mediates Synaptic Dysfunction in Alzheimer's Disease
Yanfang Li1, Zhicai Chen2, Yue Gao2
1Fujian Provincial Key Laboratory of Neurodegenerative Disease and Aging Research, Institute of Neuroscience, College of Medicine, Xiamen University, Xiamen 361005 Fujian, China, yfli@xmu.edu.cn huiz@bcm.edu.
Summary
Protocadherin-γC5 (Pcdh-γC5) promotes inhibitory neuron function. In Alzheimer's disease (AD), aberrant Pcdh-γC5 expression may disrupt this balance, contributing to synaptic dysfunction and offering a therapeutic target.
Area of Science:
- Neuroscience
- Molecular Biology
- Synaptic Plasticity
Background:
- Synaptic dysfunction and excitatory/inhibitory imbalance are key in Alzheimer's disease (AD) pathogenesis.
- Mechanisms of inhibitory synaptic dysfunction in AD remain understudied.
- Protocadherin-γC5 (Pcdh-γC5) promotes GABAergic synaptic transmission.
Purpose of the Study:
- Investigate the role of Pcdh-γC5 in mediating inhibitory synaptic function in AD.
- Determine how Pcdh-γC5 expression and function are affected by AD-related pathology.
- Explore Pcdh-γC5 as a potential therapeutic target for AD.
Main Methods:
- Immunohistochemistry to detect Pcdh-γC5 localization in synaptic puncta.
- Analysis of Pcdh-γC5 and GABAergic protein levels in various models.
- Genetic knock-down of Pcdh-γC5 to assess its functional impact on synaptic currents.
- Treatment with beta-amyloid (Aβ) and use of APP/PS1 transgenic mice.
Main Results:
- Pcdh-γC5 is enriched in GABAergic synaptic puncta.
- Pcdh-γC5 expression increases with neuronal hyperexcitation, Aβ treatment, and in APP/PS1 mice.
- Elevated Pcdh-γC5 correlates with increased GABAergic proteins and enhanced inhibition.
- Pcdh-γC5 directly modulates synaptic currents and Aβ-induced synaptic alterations.
Conclusions:
- Pcdh-γC5 acts as a sensor of neuronal hyperexcitation, augmenting GABAergic inhibition.
- Dysregulation of Pcdh-γC5 in chronic excitation conditions like AD contributes to synaptic dysfunction.
- Pcdh-γC5 represents a novel pathway and potential therapeutic target for AD-related synaptic dysfunction.
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