Objective:

To investigate the effects of oral administration of a human-derived GABA-producing Bacteroides salyersiae strain (HB32) on depressive-like behaviors in a rat model of social defeat stress.

Approach:

Key Findings:

• Oral administration of B. salyersiae HB32 significantly reduced depressive-like behaviors in rats subjected to social defeat stress.
• The effects of B. salyersiae HB32 were comparable to those of ketamine.
• Mechanistic analyses indicated alterations in gut-brain communication pathways.

Interpretation:

The findings suggest that the gut microbiome, specifically B. salyersiae HB32, may play a therapeutic role in managing depressive-like behaviors, potentially through GABA production and modulation of the gut-brain axis.

Limitations:

• The study was conducted in a rat model, which may not fully replicate human depression.
• Long-term effects and safety of B. salyersiae HB32 in humans remain to be established.

Conclusion:

B. salyersiae HB32 shows promise as a potential therapeutic intervention for depression, warranting further investigation in clinical settings.

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