Gut microbiota primes stroke severity via the AHR in intestinal dendritic cells.

Enrichment of indole-producing Escherichia coli worsens stroke outcomes via AHR activation in intestinal dendritic cells, with AHR deletion improving prognosis in mice.

• Why it matters: Understanding how gut microbiota influences stroke severity is crucial for developing targeted therapies, as the mechanisms linking microbiota to neurological outcomes are not fully known.
• What they did: Researchers used mouse models and patient samples to show that microbial indole activates AHR in dendritic cells, and that deleting AHR in these cells reduces neuroinflammation and improves stroke recovery.
• The result: Blocking AHR signaling enhances regulatory immune responses and gut-derived dendritic cell migration, suggesting microbial tryptophan metabolism as a promising therapeutic target for stroke intervention.