Social isolation impairs cognition via Aβ-mediated synaptic dysfunction.

Area of Science:

• Neuroscience
• Molecular Biology
• Behavioral Science

Background:

• Social isolation (SI) is prevalent and linked to cognitive impairments and mental disorders.
• Mechanisms by which SI affects brain molecules and behavior remain unclear.

Purpose of the Study:

• To investigate the molecular mechanisms underlying social isolation-induced cognitive deficits.
• To explore the role of BACE1 and amyloid-beta (Aβ) in social isolation's behavioral effects.

Main Methods:

• Utilized C57BL/6J mice and APP/PS1 transgenic mice models.
• Assessed cognitive function, depressive-like behaviors, synaptic plasticity, and Aβ production.
• Investigated the effect of BACE1 downregulation using shRNA.

Main Results:

• Social isolation impaired cognitive function and induced depressive-like behaviors in mice.
• SI increased APP cleavage enzymes, promoting Aβ production and synaptic dysfunction.
• Downregulating BACE1 expression attenuated Aβ toxicity and cognitive impairments.

Conclusions:

• Social isolation upregulates BACE1, leading to Aβ toxicity and behavioral deficits.
• Targeting BACE1 offers a potential therapeutic strategy for preventing cognitive impairments associated with social isolation.