Mechanisms of antifungal agent resistance

Y L Yang1, H J Lo

  • 1Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, ROC.

Insights

Yeast infections are a growing concern in hospitals, leading to increased antifungal drug resistance. Understanding resistance mechanisms is crucial for developing new strategies to combat these infections.

Area of Science:

  • Mycology
  • Infectious Diseases
  • Molecular Biology

Background:

  • Yeast infections, particularly Candida species, are significant causes of hospital-acquired infections.
  • Increasing antifungal drug usage correlates with rising reports of drug resistance.
  • Altered immune status in patients contributes to the prevalence of nosocomial yeast infections.

Purpose of the Study:

  • To review the mechanisms of action for current antifungal agents.
  • To elucidate cellular and molecular mechanisms underlying antifungal drug resistance in yeasts.
  • To propose strategies for the prevention of antifungal resistance.

Main Methods:

  • Literature review of antifungal mechanisms and resistance.
  • Analysis of cellular factors contributing to drug resistance.
  • Examination of established and proposed molecular resistance mechanisms.

Main Results:

  • Antifungal agents target various cellular processes in yeasts.
  • Multiple cellular and molecular mechanisms confer resistance to antifungal drugs.
  • Both proven and speculative molecular pathways of resistance are identified.

Conclusions:

  • Understanding antifungal resistance mechanisms is critical for effective treatment.
  • Developing novel antifungal agents and resistance-preventing strategies is essential.
  • Multifaceted approaches are needed to address the challenge of antifungal resistance.

Related Concept Videos

Treatment Resistant Cancers02:56

Treatment Resistant Cancers

Cancer is the second leading cause of death in the United States. A cancer cell is genetically unstable and hence can mutate faster. They can also modify their microenvironment and escape immune surveillance. The difficulties in treating cancer are further compounded by the emergence of rapid resistance to anticancer drugs. The most common ways to attain resistance in cancer cells include alteration in drug transport and metabolism, modification of drug target, elevated DNA damage response, or...
Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
Antifungal Agents01:15

Antifungal Agents

Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...
Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...