Beauvericin-induced channels in ventricular myocytes and liposomes |
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Authors: | K Kouri M Lemmens |
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Institution: | a Institute of Pharmacology and Toxicology, University of Vienna, Althanstr. 14, 1090 Vienna, Austria b Department of Plant Production Biotechnology, Institute for Agrobiotechnology, Konrad Lorenzstr. 20, 3430 Tulln, Austria |
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Abstract: | The antibiotic Beauvericin (BEA) was previously shown to express ionophoric properties under simple experimental systems. Its channel-forming activity was examined in inside-out patches of ventricular myocytes and synthetic membranes with the patch clamp and fluorescence imaging techniques. Current transitions to several open state levels were evident after wash-in. The BEA channel is cation-selective. Conductance and kinetics are presented for K+ and Na+ substates and main states. The pore was blocked by La3+. In myocytes, the K+]i was reduced, while Na+]i and Ca2+]i increased, leading to cytolysis. These results indicate that BEA forms cation-selective channels in lipid membranes, which can affect the ionic homeostasis. |
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Keywords: | Cyclodepsipeptide Ionophore Patch clamp Fusarium Fura |
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