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Biolistic Transformation of a Fluorescent Tagged Gene into the Opportunistic Fungal Pathogen Cryptococcus neoformans
07:32

Biolistic Transformation of a Fluorescent Tagged Gene into the Opportunistic Fungal Pathogen Cryptococcus neoformans

Published on: March 19, 2015

Role of glucose in the expression of Cryptococcus neoformans antiphagocytic protein 1, App1

Virginia Williams1, Maurizio Del Poeta

  • 1Department of Biochemistry & Molecular Biology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.

Eukaryotic Cell
|January 18, 2011
PubMed

Insights

Antiphagocytic protein 1 (App1) in Cryptococcus neoformans is upregulated in low-glucose environments like the lungs. This adaptation enhances fungal virulence by increasing App1 expression through transcription and mRNA stability.

Area of Science:

  • Medical Mycology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Cryptococcus neoformans causes life-threatening meningoencephalitis in immunocompromised individuals.
  • The cryptococcus-specific protein antiphagocytic protein 1 (App1) is crucial for fungal virulence, regulating phagocytosis via complement receptors (CR), specifically CR3.
  • Glucose availability significantly impacts C. neoformans gene expression and virulence.

Purpose of the Study:

  • To investigate the role of glucose availability in regulating App1 expression in C. neoformans.
  • To understand how C. neoformans adapts to low-glucose environments, such as the mammalian lung.

Main Methods:

  • Culturing C. neoformans under varying glucose conditions.
  • Incubating C. neoformans in low-glucose biological fluids (BAL fluid, serum, cerebrospinal fluid).
  • Analyzing App1 expression at both transcriptional and mRNA stability levels.

Main Results:

  • App1 expression was dramatically upregulated under low-glucose conditions.
  • App1 was also upregulated when C. neoformans was incubated in low-glucose biological fluids.
  • App1 upregulation occurred through both increased transcription and enhanced mRNA stability.

Conclusions:

  • Glucose starvation is a key regulator of App1 expression in C. neoformans.
  • C. neoformans adapts to low-glucose environments by increasing App1 expression, potentially enhancing virulence.
  • These findings offer new insights into C. neoformans pathogenesis and adaptation strategies.

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