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The Aspergillus fumigatus cell wall integrity signaling pathway: drug target, compensatory pathways, and virulence

Vito Valiante1, Juliane Macheleidt1, Martin Föge2

  • 1Molecular Biotechnology of Natural Products, Department of Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute Jena, Germany.

Frontiers in Microbiology
|May 2, 2015
PubMed

Insights

Aspergillus fumigatus infections are a major threat. Understanding its cell wall integrity (CWI) signaling pathway is crucial for developing new antifungal drugs that target this essential fungal component.

Area of Science:

  • Medical Mycology
  • Molecular Biology
  • Drug Discovery

Background:

  • Aspergillus fumigatus is a significant airborne fungal pathogen causing invasive infections in immunocompromised individuals.
  • The fungal cell wall (CW) is essential for fungal survival and a key target for antifungal therapies.
  • Echinocandin derivatives targeting the CW are used, but their comparative clinical efficacy against invasive aspergillosis needs further study.

Purpose of the Study:

  • To review recent advances in understanding the cell wall integrity (CWI) signaling pathway in Aspergillus fumigatus.
  • To elucidate CW biosynthesis pathways and signal transduction cascades that may compensate for CW-targeting drug inhibition.
  • To explore the role of CWI signaling in drug stress response and fungal virulence.

Main Methods:

  • Review of existing literature on Aspergillus fumigatus CWI signaling.
  • Analysis of gene deletion studies affecting CWI pathway components (mitogen-activated protein kinases).
  • Examination of cross-talk interactions between CWI and other signaling pathways.

Main Results:

  • The core CWI pathway in A. fumigatus involves three mitogen-activated protein kinases.
  • Deletion of CWI pathway genes leads to increased sensitivity to CW-disrupting agents and significant morphological changes.
  • Emerging evidence suggests cross-talk between CWI and other pathways plays a role in compensatory mechanisms.

Conclusions:

  • The CWI signaling pathway is critical for maintaining cell wall integrity and fungal morphology in A. fumigatus.
  • Understanding this pathway and its compensatory mechanisms is vital for developing effective treatments against invasive aspergillosis.
  • Further research into CWI pathway interactions could reveal novel therapeutic targets.
Keywords:
Aspergillus fumigatuscell wall integritymitogen activated protein kinases (MAPKs)signaling pathwaysvirulence

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