Social isolation induces succinate dehydrogenase dysfunction in anxious mice

Area of Science:

• Neuroscience
• Mitochondrial Biology
• Behavioral Science

Background:

• Social isolation is known to induce anxiety-like behaviors, cognitive deficits, and reduced brain adenosine triphosphate (ATP) levels in mice.
• Dihydromyricetin (DHM), a GABA_A receptor modulator, has previously shown efficacy in ameliorating these social isolation-induced changes.

Purpose of the Study:

• To investigate the subcellular mechanisms by which social isolation affects brain energy metabolism.
• To examine the impact of social isolation on mitochondrial oxidative capacity within the electron transport chain.
• To determine if DHM treatment can restore mitochondrial function in a social isolation mouse model.

Main Methods:

• Establishment of a social isolation-induced anxiety mouse model.
• Assessment of brain ATP levels and mitochondrial oxidative capacity, specifically succinate dehydrogenase activity.
• Administration of dihydromyricetin (DHM) at 2 mg/kg orally daily.

Main Results:

• Four weeks of social isolation significantly decreased brain ATP levels by 43% and succinate dehydrogenase capacity by 52% compared to controls.
• Daily oral administration of DHM (2 mg/kg) effectively restored succinate dehydrogenase capacity in isolated mice.
• These findings indicate that social isolation impairs mitochondrial ATP generation, a deficit that DHM can reverse.

Conclusions:

• Social isolation leads to a reduction in mitochondrial capacity for ATP production, contributing to observed behavioral and cognitive deficits.
• Dihydromyricetin (DHM) demonstrates potential as a therapeutic agent for anxiety and mitochondrial stress by restoring mitochondrial function.