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AHR in the intestinal microenvironment: safeguarding barrier function.

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The aryl hydrocarbon receptor (AHR) is an environmental sensor crucial for intestinal barrier protection. Emerging research highlights its beneficial roles in immune and other intestinal cells, shifting focus from pollutant effects.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The aryl hydrocarbon receptor (AHR) is a transcription factor involved in environmental sensing.
  • Historically viewed as mediating pollutant toxicity, recent studies reveal beneficial AHR functions.
  • AHR plays roles in various immune and non-immune cells within the intestinal microenvironment.

Purpose of the Study:

  • To review the regulation of the AHR pathway.
  • To highlight the barrier-protective roles of AHR in the intestinal microenvironment.
  • To discuss AHR's physiological functions in intestinal cells.

Main Methods:

  • Literature review of AHR pathway regulation.
  • Analysis of AHR's role in haematopoietic and non-haematopoietic intestinal cells.
  • Examination of AHR ligands and feedback mechanisms.

Main Results:

  • AHR activation has beneficial functions, particularly in barrier protection.
  • AHR is implicated in the physiology of intestinal immune, epithelial, endothelial, and neuronal cells.
  • The study outlines AHR ligand types and pathway feedback regulation.

Conclusions:

  • AHR is a critical regulator of intestinal barrier function.
  • Understanding AHR signaling is key to appreciating its diverse physiological roles.
  • The review emphasizes the shift in perspective regarding AHR's function from toxic mediator to beneficial regulator.