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Targeting ApoE-KCC2 Signaling Rescues GABAergic Synaptic Dysfunction and Depression-like Behaviors in Mice
Chengyuan Xu1,2, Jing Liu1, Mengru Guo1
1Department of Pharmacology, School of Pharmaceutical Sciences, Anhui Medical University, Hefei 230032, Anhui, China.
Research (Washington, D.C.)
|June 18, 2025
Summary
Apolipoprotein E (ApoE) deficiency causes depression-like behaviors by impairing GABAergic transmission. Activating ApoE or KCC2 signaling alleviates these behaviors, suggesting a new therapeutic target for depression.
Area of Science:
- Neuroscience
- Molecular Biology
- Psychiatry
Background:
- Apolipoprotein E (ApoE) is linked to neurodegenerative diseases, but its role in depression is unclear.
- Understanding ApoE's function in depression is crucial for developing novel treatments.
Purpose of the Study:
- To investigate the role of ApoE in depression pathophysiology.
- To explore the underlying mechanisms involving GABAergic synaptic transmission and KCC2.
- To identify potential therapeutic targets for depression.
Main Methods:
- Utilized chronic social defeat stress (CSDS) to model depression in mice.
- Employed ApoE knockout (ApoE-/-) and knockdown (ApoE-KD) mouse models.
- Performed coimmunoprecipitation, gene manipulation (overexpression/knockdown), and pharmacological treatments (CLP290, CLP257).
Main Results:
- ApoE deficiency induced depression-like behaviors associated with impaired GABAergic transmission and reduced KCC2 expression.
- An interaction between KCC2 and the ApoE receptor LDLR was identified.
- Overexpression of ApoE, activation of hippocampal GABAergic neurons, and KCC2 activator treatment reversed depression-like behaviors.
Conclusions:
- ApoE plays a critical role in the pathophysiology of depression.
- The ApoE-KCC2 signaling pathway is a promising target for novel antidepressant therapies.
