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2019 - In vitro and in vivo characterization of a synthetic scorpion toxin AmmTx3, a potent inhibitor of cardiac voltage-gated potassium channel Kv4.2

icon sp96   SyncroPatch 384PE (a predecessor model of the SyncroPatch 384i) publication in Archives of Cardiovascular Diseases Supplements (2019)

Nicolas S., Zoukimian C.,Meuda H., De Waard S., Ait Ouares K., Canepari M., Beroud R., Landon C., De Waard M., Boturyn D.

Archives of Cardiovascular Diseases Supplements (2019) 11(2):259-260


Voltage-gated potassium channel Kv4.2 (encoded by KCND2 gene) contributes to the cardiac transient outward potassium current (Ito1). This current is the main contributor to the repolarisation phase 1 of the cardiac action potential. The toxin AmmTx3, identified from the venom of the scorpion Androctonus mauretanicus, is a blocker of Kv4.x channels, and have interesting therapeutic potential for neurological disorders due to its effect in cerebellar granule neurons. Its effects on cardiac Kv4.2 channels remains unclear.


AmmTx3 toxin can be chemically synthesized and used as a Kv4.2 channel inhibitor to contributed to the better understanding of the exact role of Ito1 in cardiac electrophysiology. Those first results seem to be a promising evidence that AmmTx3 could a potential inhibitor of Ito current in early repolarisation syndrome.

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