Interventions after acute stress prevent its delayed effects on the amygdala

Area of Science:

• Neuroscience
• Behavioral Science
• Endocrinology

Background:

• Acute stress induces delayed plasticity in the basolateral amygdala (BLA) and anxiety-like behavior.
• These delayed effects manifest 10 days after a single stress exposure.
• This temporal gap suggests a potential window for therapeutic intervention.

Purpose of the Study:

• To investigate the efficacy of an anxiolytic drug in reversing delayed stress effects.
• To explore the potential of a post-stress intervention window.

Main Methods:

• Rats were exposed to immobilization stress.
• Diazepam or vehicle was administered 1 hour post-stress.
• Anxiety-like behavior (elevated plus-maze) and BLA dendritic spine density were assessed 10 days later.
• Corticosterone levels were measured.

Main Results:

• Diazepam administration 1 hour after stress prevented delayed anxiety and BLA spinogenesis.
• Vehicle administration also showed protective effects on behavior and synaptic changes.
• Vehicle gavage induced a significant rise in corticosterone, comparable to stress.

Conclusions:

• Corticosterone surge, induced by post-stress gavage, reversed delayed anxiety and BLA synaptic enhancements.
• These findings support the protective role of glucocorticoids against stress-induced disorders.
• Intervention within 1 hour after acute stress can prevent long-term behavioral and neural consequences.