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Differential effects of alkaloids on sodium currents of isolated single skeletal muscle fibers

The effects of the alkaloids ajmaline, lupanine, sparteine, serpentine, strychnine, and yohimbine were studied with the loose patch clamp technique on sodium currents of isolated single skeletal muscle fibers. The IC50 values for half-maximal blocking of the sodium currents were 6.6 μM for ajmaline,...

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Hauptverfasser: Körper, Sixten (VerfasserIn) , Wink, Michael (VerfasserIn) , Fink, Rainer (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 1998
In: FEBS letters
Year: 1998, Jahrgang: 436, Heft: 2, Pages: 251-255
ISSN:1873-3468
DOI:10.1016/S0014-5793(98)01135-1
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/S0014-5793(98)01135-1
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0014579398011351
Volltext
Verfasserangaben:Sixten Körper, Michael Wink, Rainer H.A Fink

MARC

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520 |a The effects of the alkaloids ajmaline, lupanine, sparteine, serpentine, strychnine, and yohimbine were studied with the loose patch clamp technique on sodium currents of isolated single skeletal muscle fibers. The IC50 values for half-maximal blocking of the sodium currents were 6.6 μM for ajmaline, 55.7 μM for quinidine, 168.8 μM for sparteine, and 1.2 mM for lupanine. The observed Na+ channel inhibition is in accordance with the use of ajmaline, quinidine and sparteine as antiarrhythmic drugs. The interference of alkaloids with Na+ channels can also be interpreted as a means to strongly interfere with neuronal transmission in herbivores. Alkaloids thus serve as chemical defense compounds for the plants producing them. 
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