GFRAL neurons remodel intestinal structure and type 2 immunity

In mice, brainstem GFRAL-expressing neurons remodel intestinal structure and prime type 2 immunity, with excitability changes driving opposite shifts in tuft and goblet cells and type 2 cytokines.

• Why it matters: Neural control of intestinal type 2 immune programs is not well defined, limiting understanding of how brainstem circuits coordinate epithelial remodeling during intestinal disease.
• What they did: The study used mouse models to test how type 2 inflammation activates GFRAL neurons, then manipulated neuron excitability or inhibition and assessed intestinal epithelial populations and type 2 cytokine expression via a vagal brain-gut circuit.
• The result: Increasing excitability was sufficient to expand tuft and goblet cells and raise intestinal type 2 cytokines, while inhibiting GFRAL neurons produced largely opposite changes, reshaping outcomes in food allergy, helminth infection, and colitis models.

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