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Candida biofilm resistance

Pranab K Mukherjee1, Jyotsna Chandra

  • 1Department of Dermatology, Center for Medical Mycology, Case Western Reserve University, 11100 Euclid Avenue, LKS-5028 Cleveland, OH 44106-5028, USA. pkm@cwru.edu

Drug Resistance Updates : Reviews and Commentaries in Antimicrobial and Anticancer Chemotherapy
|November 10, 2004
PubMed

Insights

Device biofilms, often caused by Candida species, show high resistance to antifungals. Mechanisms include drug efflux pumps and altered membrane sterols, contributing to persistent fungal infections.

Area of Science:

  • Mycology
  • Infectious Diseases
  • Biotechnology

Background:

  • Device-related infections are a significant challenge in healthcare settings.
  • Biofilms formed by microbial pathogens on medical devices contribute to persistent infections.
  • Candida species are a common cause of fungal device-related infections, exhibiting high antimicrobial resistance.

Purpose of the Study:

  • To investigate the mechanisms underlying the enhanced antifungal resistance of Candida biofilms.
  • To identify factors contributing to the persistence of fungal biofilms despite antifungal therapy.

Main Methods:

  • Analysis of gene expression related to drug efflux pumps during early biofilm formation.
  • Assessment of membrane sterol composition in Candida biofilms.
  • Evaluation of the role of extracellular matrix (ECM) in drug resistance and diffusion.

Main Results:

  • Candida biofilms demonstrate significantly enhanced resistance to most antifungal agents, with exceptions including echinocandins and lipid formulations of amphotericin B.
  • Upregulation of drug efflux pumps and alterations in membrane sterol composition are key contributors to azole resistance in these biofilms.
  • Metabolic dormancy and the extracellular matrix (ECM) do not appear to be primary drivers of resistance, though ECM can impede drug diffusion in mixed-species biofilms.

Conclusions:

  • Multifactorial resistance mechanisms in fungal biofilms provide broad-spectrum defense against various antifungal agents.
  • Understanding these mechanisms is crucial for developing effective strategies against persistent Candida biofilm infections.
  • These resistance strategies in fungal biofilms share common themes with those observed in other microbial biofilms.

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