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Bile acid-sensitive tuft cells regulate biliary neutrophil influx.

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Biliary tuft cells, rare gallbladder cells, act as negative regulators of inflammation. Bile acids control their numbers, suggesting a role in maintaining biliary health and preventing inflammation.

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Area of Science:

  • Gastroenterology and Hepatology
  • Cell Biology
  • Immunology

Background:

  • Extrahepatic biliary tree inflammation and dysfunction are implicated in gallstones and cholangiocarcinoma.
  • Local regulation of biliary inflammation remains poorly understood.
  • Tuft cells are rare sensory epithelial cells found in the gallbladder and extrahepatic bile ducts.

Purpose of the Study:

  • To investigate the role of biliary tuft cells in regulating inflammation within the extrahepatic biliary tree.
  • To determine the relationship between bile acids, tuft cell abundance, and biliary inflammation.
  • To explore the impact of tuft cell deficiency on biliary inflammation and the role of the microbiome.

Main Methods:

  • Characterization of biliary tuft cell gene expression.
  • Manipulation of enterohepatic bile acid recirculation.
  • Analysis of tuft cell-deficient mouse models.
  • Assessment of inflammatory gene signatures and neutrophil infiltration.
  • Microbiome analysis in relation to biliary inflammation.

Main Results:

  • Biliary tuft cells express a distinct genetic program and decrease postnatally with bile acid maturation.
  • Bile acids negatively regulate tuft cell abundance, with loss of tuft cells observed in obstructive cholestasis.
  • Tuft cell-deficient mice exhibit spontaneous gallbladder inflammation and neutrophil infiltration, modulated by the microbiome.

Conclusions:

  • Biliary tuft cells function as bile acid-sensitive negative regulators of inflammation in the biliary tree.
  • These cells may limit inflammation under homeostatic conditions.
  • Findings suggest a novel mechanism for maintaining biliary tissue homeostasis involving tuft cells and bile acid signaling.