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Related Experiment Videos

Phenotypic switching in Cryptococcus neoformans.

A Guerrero1, N Jain2, D L Goldman3

  • 1Departments of Microbiology and Immunology at All India Institute of Medical Sciences, New Delhi, India.

Microbiology (Reading, England)
|December 31, 2005
PubMed
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Cryptococcus neoformans phenotypic switching affects virulence and host immune response during chronic infections. Certain variants, like the mucoid form, can worsen meningitis and are selected by antifungal treatments.

Area of Science:

  • Mycology
  • Immunology
  • Infectious Diseases

Background:

  • Phenotypic switching is observed in Cryptococcus neoformans serotype A and D strains.
  • This switching occurs in vivo during chronic infections, impacting virulence and gene expression.
  • Switching involves alterations in the polysaccharide capsule and cell wall, affecting phagocytosis resistance.

Purpose of the Study:

  • To investigate the role of phenotypic switching in Cryptococcus neoformans virulence.
  • To understand how host immune responses influence the selection of switch variants.
  • To explore the clinical relevance of phenotypic switching in cryptococcal meningitis and antifungal treatment.

Main Methods:

  • In vivo studies in animal models of chronic cryptococosis.

Related Experiment Videos

  • Analysis of differential gene expression associated with phenotypic switching.
  • Assessment of inflammatory responses elicited by different switch variants.
  • Evaluation of variant selection under chemotherapeutic and immunological antifungal interventions.

    • Main Results:

    • Phenotypic switching alters Cryptococcus neoformans virulence and host inflammatory responses.
    • The mucoid variant (RC-2 MC) promotes increased intracerebral pressure in a rat meningitis model, unlike the smooth variant (RC-2 SM).
    • Antifungal interventions can select for the more virulent mucoid variant during chronic murine infection.

    Conclusions:

    • Phenotypic switching is a critical factor in the pathogenesis of Cryptococcus neoformans infections.
    • Host immune responses and antifungal treatments can influence the selection and maintenance of specific phenotypic variants.
    • Understanding phenotypic switching is crucial for managing cryptococcal meningitis and developing effective antifungal strategies.