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Open Access

Duramycin effects on voltage-gated ion channels: a QT-prolongation risk?

  • Eva-Maria Zebedin1,
  • Xaver Koenig1,
  • Miroslav Radenkovic1,
  • Halyna Pankevych1,
  • Hannes Todt1,
  • Michael Freissmuth1 and
  • Karlheinz Hilber1Email author
BMC Pharmacology20077(Suppl 2):A9

https://doi.org/10.1186/1471-2210-7-S2-A9

Published: 14 November 2007

Drug-induced prolongation of the QT interval has become a major safety concern during drug development. Duramycin, a peptide antibiotic, is in clinical development for the treatment of cystic fibrosis. It becomes deposited in cellular membranes where it binds to phosphatidylethanolamine. Duramycin may thereby change biophysical membrane properties and perturb ion channel function. Thus, its application possibly carries the risk to elicit a QT-prolongation. Here, we tested the effects of duramycin on currents through voltage-gated hERG potassium, sodium and calcium channels of various mammalian cell types in whole cell patch clamp studies. We found that duramycin bath concentrations between 1 nM and 0.1 μM did not generate any effects on these currents. Concentrations ≥0.3 μM, however, reduced the amplitudes of all the investigated currents. Moreover, sodium current fast inactivation kinetics was slowed in the presence of duramycin. The described effects exhibited concentration-dependency. A further rise in duramycin bath concentration (≥3.3 μM) induced a leak current consistent with pore formation. The reported effects of duramycin on ion channel function may be generated by disruption of biophysical membrane properties rather than by specific interaction with ion channel proteins. Our data suggest that, under therapeutic conditions (i.e. administration via inhalation), duramycin is unlikely to elicit a QT-prolongation.

Authors’ Affiliations

(1)
Center of Biomolecular Medicine and Pharmacology, Institute of Pharmacology, Medical University of Vienna

Copyright

© Zebedin et al; licensee BioMed Central Ltd. 2007

This article is published under license to BioMed Central Ltd.

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