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Size Matters: Measurement of Capsule Diameter in Cryptococcus neoformans
08:24

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Published on: February 27, 2018

Cryptococcus neoformans, a fungus under stress.

Sarah M Brown1, Leona T Campbell, Jennifer K Lodge

  • 1Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, 1402 S. Grand Boulevard, Saint Louis, MO 63104, USA. brownsm2@slu.edu

Current Opinion in Microbiology
|August 21, 2007
PubMed
Summary

Cryptococcus neoformans withstands host stresses via specific peroxidases, not catalases. Key pathways and gene expression changes aid fungal survival against oxidative and nitrosative threats.

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Area of Science:

  • Mycology
  • Molecular Biology
  • Pathogen Biology

Background:

  • Cryptococcus neoformans is a human fungal pathogen.
  • It endures various host-induced stresses like oxidative stress, high temperature, hypoxia, and nutrient deprivation.
  • Previous research identified genes involved in resistance to individual stresses.

Purpose of the Study:

  • To investigate the specific roles of genes and pathways in Cryptococcus neoformans's stress resistance.
  • To clarify the function of catalases and peroxidases in oxidative and nitrosative stress response.
  • To understand the signaling pathways and transcriptional changes associated with stress adaptation.

Main Methods:

  • Gene expression analysis using microarrays.
  • Proteomic analysis to identify protein level changes.
  • Investigating the roles of specific enzymes like catalases and peroxidases.
  • Analyzing signal transduction pathways including HOG1 and calcineurin/calmodulin.

Main Results:

  • Catalases do not play the expected role in external oxidative stress resistance.
  • Specific peroxidases are crucial for resistance to both oxidative and nitrosative stresses.
  • Signal transduction pathways like HOG1 and calcineurin/calmodulin are involved in the stress response.
  • Common stress responses include induction of metabolic and oxidative stress genes and repression of translational machinery genes.

Conclusions:

  • Specific peroxidases are essential for Cryptococcus neoformans survival under oxidative and nitrosative stress.
  • Understanding these stress response mechanisms is vital for developing antifungal strategies.
  • Transcriptional reprogramming involving metabolic genes and translational machinery is a key adaptation strategy.