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Tuft cell-derived acetylcholine regulates epithelial fluid secretion.

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  • 1Department of Immunology, University of Washington School of Medicine, Seattle, Washington, USA.

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|March 30, 2023
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Summary

Intestinal tuft cells release acetylcholine (ACh) to rapidly induce fluid secretion, not immune responses. This tuft cell-regulated fluid secretion is crucial for clearing parasitic worms and maintaining mucosal barriers.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Cell Biology

Background:

  • Tuft cells are solitary chemosensory cells at mucosal barriers, regulating tissue physiology and immunity.
  • In the intestine, tuft cells detect helminths and succinate, initiating Type 2 immune responses and epithelial remodeling.
  • The function of acetylcholine (ACh) secreted by airway tuft cells is known, but its role in the intestine remains unclear.

Approach:

  • Investigated tuft cell chemosensing in the intestine.
  • Assessed the role of tuft cell-derived ACh in immune cell activation and tissue remodeling.
  • Examined the impact of ACh on epithelial fluid secretion and helminth clearance in mice.

Key Points:

  • Intestinal tuft cell chemosensing triggers ACh release, but does not activate immune cells or cause tissue remodeling.
  • Tuft cell-derived ACh directly stimulates immediate fluid secretion into the intestinal lumen.
  • This fluid secretion is amplified during Type 2 inflammation, and its absence delays helminth clearance.

Conclusions:

  • Tuft cell chemosensing coupled with ACh release forms an epithelium-intrinsic response unit, rapidly altering fluid secretion.
  • This mechanism is conserved across tissues, regulating epithelial secretion vital for Type 2 immunity and mucosal homeostasis.