Early-life stress induces persistent astrocyte dysfunction associated with fear generalisation.

Area of Science:

• Neuroscience
• Cell Biology
• Behavioral Science

Background:

• Early-life stress (ELS) has lasting impacts on behavior and cognition.
• Neuronal changes from ELS are known, but non-neuronal cell contributions are understudied.
• Understanding cell type interactions is key to linking cellular changes to behavioral deficits.

Purpose of the Study:

• To investigate the role of non-neuronal cells, specifically astrocytes, in mediating the effects of ELS.
• To explore the cellular and synaptic mechanisms underlying ELS-induced behavioral changes in the amygdala.
• To determine if astrocyte dysfunction is a causal factor in ELS-related deficits.

Main Methods:

• Used male and female mice exposed to ELS.
• Assessed anxiety-like behavior and fear generalization using amygdala-dependent tasks.
• Examined synaptic plasticity, neural excitability, and astrocyte function.
• Genetically manipulated amygdala astrocyte activity and network function.

Main Results:

• ELS induced anxiety-like behavior and fear generalization.
• Behavioral changes correlated with impaired synaptic plasticity, increased neural excitability, and astrocyte hypofunction.
• Reducing amygdala astrocyte calcium activity or network function mimicked ELS-associated cellular and behavioral deficits.

Conclusions:

• Astrocytes play a critical role in regulating emotionally salient memory.
• ELS leads to astrocyte hypofunction, contributing to behavioral and cognitive deficits.
• Targeting astrocyte function may offer therapeutic avenues for ELS-induced disorders.