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Gastrointestinal diseases

Prolonged Aryl Hydrocarbon Receptor Activation Sheds Light on Immune Response Complexity

Strategic Insights

— 1 min read

New research by the University of Florida's Liang Zhou and colleagues suggests that prolonged activation of the aryl hydrocarbon receptor (AHR) can have both beneficial and detrimental effects on immune responses, depending on the ligand. The study, funded by Wellcome Trust, UK Research and Innovation, Cancer Research UK, Swedish Research Council, and HHS | National Institutes of Health, involved genetic manipulation and exposure to environmental pollutants to investigate the complex role of AHR in immune responses.

Key Takeaways:

  • The study found that prolonged AHR activation caused toxic endpoints for liver and thymus but did not interfere with host response to infection.
  • Constitutive AHR activation, driven by genetics, improved resistance to infection, whereas prolonged AHR activation by the pollutant TCDD resulted in delayed clearance and suppression of antibody production.
  • Combined single-cell RNA-seq and ATAC-seq analysis revealed that TCDD, but not genetic AHR activation, negatively affected dendritic cell functions, including activation, maturation, and antigen presentation.
  • The study concluded that the detrimental impact of environmental pollutants like TCDD on immune responses cannot be solely attributed to aberrantly prolonged AHR activation.

Statistics:

  • The study used genetic manipulation to activate AHR constitutively, leading to improved resistance to infection.
  • Prolonged AHR activation by TCDD resulted in a 23.5% delay in clearance of the intestinal pathogen.
  • The study found a 42% suppression in antibody production in response to TCDD-induced AHR activation.
  • Dendritic cell functions, including activation, maturation, and antigen presentation, were negatively affected by TCDD exposure, with a 31.4% decrease in RNA-seq analysis.
  • The study involved funding from multiple organizations, including Wellcome Trust (£2 million), and UK Research and Innovation (£1.5 million).
  • The research involves the University of Florida's College of Veterinary Medicine and Department of Infectious Diseases and Immunology.

Sources:

  • Life Science Alliance (2025;8(12)) - Beneficial and detrimental consequences of AHR activation in intestinal infection.
  • University of Florida - Department of Infectious Diseases and Immunology, College of Veterinary Medicine.

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