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The small neurotoxin apamin blocks not only small conductance Ca activated K channels (SK type) but also the voltage dependent Kv1.3 channel

European Biophysics Journal, ISSN: 1432-1017, Vol: 46, Issue: 6, Page: 517-523
2017
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Article Description

Apamin is frequently used as a specific blocker of small-conductance Ca-activated (SK type) K channels. Here we show that the small neurotoxin is not as specific as anticipated. It is also a high-affinity inhibitor with an IC of 13 nM of the Kv1.3 channel; it blocks the latter with potency similar to the Kv1.3 blocker PAP-1. Since SK type channels and Kv1.3 channels are frequently coexpressed in different tissues such as cells of the immune system, apamin must be used with caution as a pharmacological tool.

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