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Multidrug resistance in yeast Candida

Rajendra Prasad1, Khyati Kapoor

  • 1Membrane Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi-110067, India.

International Review of Cytology
|December 16, 2004
PubMed

Insights

Candida species are opportunistic pathogens causing severe infections, especially in immunocompromised patients. Multidrug resistance (MDR) in these fungi, driven by azole use, is a significant challenge in antifungal therapy.

Area of Science:

  • Medical Mycology
  • Antimicrobial Resistance
  • Molecular Biology

Background:

  • Opportunistic fungal pathogens like Candida albicans pose increasing threats to immunocompromised individuals.
  • Candida species infections are severe and complicated by the development of antifungal resistance.
  • The widespread use of azole antifungals has accelerated the emergence of multidrug resistance (MDR).

Purpose of the Study:

  • To investigate the mechanisms underlying azole resistance in Candida species.
  • To identify key molecular players contributing to multidrug resistance in clinical isolates.

Main Methods:

  • Analysis of target enzyme (lanosterol 14 alpha-demethylase) mutations and overexpression.
  • Investigating the transcriptional activation of drug efflux pump genes.
  • Studying ATP-binding cassette (ABC) and major facilitator superfamily (MFS) transporters.

Main Results:

  • Overexpression of or mutations in lanosterol 14 alpha-demethylase contribute to azole resistance.
  • Transcriptional activation of drug efflux pump genes, including ABC transporters (CDR1, CDR2) and MFS transporters (CaMDR1), is implicated in MDR.
  • High expression levels of CDR1, CDR2, and CaMDR1 were observed in azole-resistant clinical isolates.

Conclusions:

  • Mechanisms of MDR in Candida involve alterations in azole targets and increased activity of drug efflux pumps.
  • ABC and MFS transporters, particularly CDR1, CDR2, and CaMDR1, are crucial for azole resistance in Candida.
  • Understanding these resistance mechanisms is vital for developing effective antifungal therapies against Candida infections.

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