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Immune regulation and tolerance to fungi in the lungs and skin

L Romani1, P Puccetti

  • 1Department of Experimental Medicine and Biochemical Sciences, University of Perugia, Perugia, Italy.

Chemical Immunology and Allergy
|September 20, 2008
PubMed

Insights

Successful host-fungal interactions require immune balance. Dysregulated inflammation, particularly involving Th17 cells and regulatory T cells (Tregs), can lead to fungal persistence and tissue damage, with indoleamine 2,3-dioxygenase (IDO) offering a regulatory mechanism.

Area of Science:

  • Immunology
  • Mycology
  • Host-Pathogen Interactions

Background:

  • Successful host-fungal interactions depend on balanced immune signaling.
  • Inflammation is crucial for antifungal defense, but its dysregulation exacerbates fungal diseases.
  • The Th17 pathway and regulatory T cells (Tregs) play complex roles in fungal immunity.

Purpose of the Study:

  • To explore the intricate balance of immune responses in fungal infections.
  • To understand the role of Th17 cells, Th2 cells, and Tregs in fungal persistence and inflammation.
  • To investigate the contribution of indoleamine 2,3-dioxygenase (IDO) and tryptophan catabolites in regulating host antifungal immunity.

Main Methods:

  • Analysis of pro- and anti-inflammatory signaling pathways.
  • Investigation of innate and adaptive immune system coordination.
  • Assessment of Th17, Th2, and Treg cell involvement in fungal burden-dependent responses.
  • Evaluation of IDO and tryptophan metabolite functions in immune homeostasis.

Main Results:

  • Immune dysregulation, including Th17 and Th2 cell activation, can lead to fungal persistence despite inflammation.
  • Regulatory T cells (Tregs) are essential for protective tolerance to fungi.
  • Indoleamine 2,3-dioxygenase (IDO) and tryptophan catabolites contribute to immune homeostasis, preventing excessive inflammation and tissue damage.

Conclusions:

  • The interplay between Th17, Th2, and Tregs is critical in managing fungal infections.
  • IDO and tryptophan metabolites act as key regulators, balancing protective immunity with tolerance to prevent pathology.
  • Targeting these pathways may offer novel therapeutic strategies for fungal diseases.

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