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Fungus fuels mucosal wounds in Crohn's disease

Kevin M Magnaye1, Susan V Lynch1

  • 1Department of Medicine, University of California, San Francisco, CA, USA.

Immunity
|May 12, 2021
PubMed

Insights

The yeast Debaryomyces hansenii hinders gut healing in mice by affecting immune responses. This fungus is also found in inflamed tissues of Crohn's disease patients, suggesting a role in the condition.

Area of Science:

  • Microbiology
  • Immunology
  • Gastroenterology

Background:

  • Crohn's disease (CD) is linked to gut microbiome changes, but specific causative agents are unknown.
  • Understanding factors contributing to CD pathophysiology is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the role of Debaryomyces hansenii in intestinal healing.
  • To explore the mechanisms by which D. hansenii affects the host immune system in the context of gut inflammation.

Main Methods:

  • Experiments were conducted in mouse models of intestinal healing.
  • Analysis involved assessing the impact of D. hansenii on immune signaling pathways, specifically type I interferon and chemokine CCL5.
  • Microbial and tissue samples from Crohn's disease patients were analyzed for the presence of D. hansenii.

Main Results:

  • Debaryomyces hansenii was found to impair intestinal healing in mice.
  • This impairment was associated with alterations in type I interferon signaling and CCL5 chemokine expression in macrophages.
  • D. hansenii was identified as prevalent in the inflamed mucosa of patients with Crohn's disease.

Conclusions:

  • Debaryomyces hansenii may contribute to the pathophysiology of Crohn's disease by hindering intestinal repair.
  • The fungus's effects on macrophage immune signaling highlight a potential mechanism for its detrimental impact on gut health.

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