Microbial metabolism of L-tyrosine protects against allergic airway inflammation

Nat Immunol. 2021 Mar;22(3):279-286. doi: 10.1038/s41590-020-00856-3. Epub 2021 Jan 25.

Abstract

The constituents of the gut microbiome are determined by the local habitat, which itself is shaped by immunological pressures, such as mucosal IgA. Using a mouse model of restricted antibody repertoire, we identified a role for antibody-microbe interactions in shaping a community of bacteria with an enhanced capacity to metabolize L-tyrosine. This model led to increased concentrations of p-cresol sulfate (PCS), which protected the host against allergic airway inflammation. PCS selectively reduced CCL20 production by airway epithelial cells due to an uncoupling of epidermal growth factor receptor (EGFR) and Toll-like receptor 4 (TLR4) signaling. Together, these data reveal a gut microbe-derived metabolite pathway that acts distally on the airway epithelium to reduce allergic airway responses, such as those underpinning asthma.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Administration, Oral
  • Allergens
  • Animals
  • Antibodies / immunology
  • Antibodies / metabolism*
  • Antibody Diversity
  • Bacteria / immunology
  • Bacteria / metabolism*
  • Cells, Cultured
  • Chemokine CCL20 / metabolism
  • Coculture Techniques
  • Cresols / administration & dosage
  • Cresols / metabolism*
  • Disease Models, Animal
  • ErbB Receptors / metabolism
  • Female
  • Gastrointestinal Microbiome*
  • Host-Pathogen Interactions
  • Injections, Intravenous
  • Intestines / microbiology*
  • Lung / immunology
  • Lung / metabolism*
  • Lung / pathology
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Pneumonia / immunology
  • Pneumonia / metabolism
  • Pneumonia / microbiology
  • Pneumonia / prevention & control*
  • Respiratory Hypersensitivity / immunology
  • Respiratory Hypersensitivity / metabolism
  • Respiratory Hypersensitivity / microbiology
  • Respiratory Hypersensitivity / prevention & control*
  • Signal Transduction
  • Sulfuric Acid Esters / administration & dosage
  • Sulfuric Acid Esters / metabolism*
  • Toll-Like Receptor 4 / metabolism
  • Tyrosine / administration & dosage
  • Tyrosine / metabolism*

Substances

  • Allergens
  • Antibodies
  • CCL20 protein, mouse
  • Chemokine CCL20
  • Cresols
  • Sulfuric Acid Esters
  • Tlr4 protein, mouse
  • Toll-Like Receptor 4
  • Tyrosine
  • 4-cresol sulfate
  • EGFR protein, mouse
  • ErbB Receptors