Gut microbial metabolism via hippocampal indole-AhR signaling regulates emotional symptoms.

Gut microbial indole signaling via hippocampal AhR influences emotional behavior, with a 50% reduction linked to affective symptoms in IBS models.

• Why it matters: Understanding how gut microbiota affect emotion is crucial for developing targeted therapies for mood disorders associated with gastrointestinal conditions, yet the mechanisms remain unclear.
• What they did: Researchers identified a pathway involving Alistipes shahii, tryptophanase, and indole production, examining its impact on hippocampal AhR activity and emotional regulation through microbiota analysis, transplantation, and pharmacological interventions.
• The result: Restoring indole levels or activating hippocampal AhR alleviated emotional symptoms in IBS mice, revealing a potential therapeutic target within the gut-brain axis for affective disturbances.