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Related Concept Videos

Antifungal Agents01:15

Antifungal Agents

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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...
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Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

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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...
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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...
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Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

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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...
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Impact of Pharmacokinetic–Pharmacodynamic Models: Regulatory Decisions01:15

Impact of Pharmacokinetic–Pharmacodynamic Models: Regulatory Decisions

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PK–PD modeling has significantly influenced FDA regulatory decisions, particularly drug approval, dosage optimization, and labeling. These models integrate pharmacokinetics (PK) and pharmacodynamics (PD) to predict drug behavior and effects, aiding in optimizing dosing regimens and enhancing the probability of clinical trial success.One notable example is Nesiritide (Natrecor®), a recombinant human brain natriuretic peptide for treating acute decompensated congestive heart failure...
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Treatment Resistant Cancers

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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...
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Whole Genome Sequencing of Candida glabrata for Detection of Markers of Antifungal Drug Resistance
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Echinocandin resistance: an emerging clinical problem?

Maiken C Arendrup1, David S Perlin

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Echinocandin resistance in Candida is rising, especially in C. glabrata, necessitating susceptibility testing. Understanding resistance mechanisms and improving detection methods are crucial for managing invasive candidiasis.

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Area of Science:

  • Mycology
  • Infectious Diseases
  • Antimicrobial Resistance

Background:

  • Echinocandin drugs are first-line treatments for invasive candidiasis.
  • Rising echinocandin resistance in Candida species poses a significant clinical challenge.

Purpose of the Study:

  • Review recent advances in echinocandin resistance in Candida.
  • Discuss epidemiology, resistance mechanisms, detection methods, and clinical implications.

Main Methods:

  • Literature review of recent studies on echinocandin resistance in Candida.
  • Analysis of epidemiological data, genetic mutations, and antifungal susceptibility testing (AST) methods.

Main Results:

  • Echinocandin resistance is increasingly prevalent across Candida species, notably in Candida glabrata.
  • Mutations in target genes are linked to species-specific resistance, often detected after prolonged treatment and associated with poor outcomes.
  • Standard AST methods reliably detect resistance, but commercial tests show variability; novel detection technologies are emerging.

Conclusions:

  • Echinocandin resistance is a growing concern, making AST essential, particularly in patients with prior antifungal exposure.
  • Development of rapid, user-friendly commercial AST platforms is needed.
  • Antifungal stewardship is vital to mitigate resistance selection pressure.