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Biologically active amphotericin B-calix[4]arene conjugates.

Valérie Paquet1, Andreas Zumbuehl, Erick M Carreira

  • 1Laboratorium für Organische Chemie, ETH Hönggerberg, CH-8093 Zürich, Switzerland.

Bioconjugate Chemistry
|November 16, 2006
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Summary

New calix[4]arene-amphotericin B conjugates show potent antifungal activity and reduced toxicity. These novel compounds form ion channels, offering improved tools for studying amphotericin B

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Area of Science:

  • Medicinal Chemistry
  • Biophysics
  • Pharmacology

Background:

  • Amphotericin B is a vital antifungal agent but suffers from significant toxicity.
  • Understanding the mechanism of amphotericin B, particularly its ion channel formation, is crucial for developing safer alternatives.

Purpose of the Study:

  • To synthesize novel amphotericin B conjugates using a calix[4]arene scaffold.
  • To evaluate the antifungal activity and hemotoxicity of these new conjugates.
  • To investigate the ion channel formation properties of the synthesized amphotericin B tetramers.

Main Methods:

  • Covalent linkage of four amphotericin B molecules to a calix[4]arene scaffold.
  • Assessment of antifungal activity using minimal inhibitory concentration (MIC) assays.
  • Evaluation of hemotoxicity through comparative studies with monomeric amphotericin B.
  • Monitoring ion channel formation via potassium (K+) efflux from liposomes.

Main Results:

  • Successful synthesis of calix[4]arene-amphotericin B conjugates that adopt a cone conformation mimicking transmembrane pores.
  • Conjugates 3 and 4 exhibited antifungal activity comparable or superior to native amphotericin B (MICs of 0.10 and 0.25 microM).
  • The novel conjugates demonstrated at least a 10-fold reduction in hemotoxicity compared to monomeric amphotericin B.
  • Ion channel formation by the amphotericin B tetramer in lipid bilayers was confirmed through K+ efflux measurements.

Conclusions:

  • The synthesized calix[4]arene-amphotericin B conjugates represent promising therapeutic agents with enhanced efficacy and reduced toxicity.
  • These conjugates provide valuable tools for elucidating the ion channel-forming mechanism of amphotericin B.
  • The study highlights the potential of macrocyclic scaffolds in drug delivery and the development of improved antifungal therapies.