XB-ART-18285
FEBS Lett
1996 Apr 29;3851-2:77-80.
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Blockade of HERG channels expressed in Xenopus oocytes by the histamine receptor antagonists terfenadine and astemizole.
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The widely used histamine receptor antagonists terfenadine and astemizole were shown to prolong the QT interval in electrocardiographic recordings in cases of overdose or inappropriate co-medications, indicating a possible interaction with cardiac K+ channels. Here, terfenadine and astemizole both inhibited the human ether-a-go-go related gene (HERG) encoded channels expressed in Xenopus oocytes at nanomolar concentrations in a use- and voltage-dependent fashion. In contrast, inhibition of other delayed rectifier (Kv1.1 and IsK) or inward rectifier K+ channels (IRK1) was much weaker and occurred only at high micromolar concentrations. These results suggest that blockade of HERG channels by terfenadine and astemizole might contribute to the cardiac side effects of these compounds.
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Species referenced: Xenopus
Genes referenced: gnao1 kcna1 kcne1 kcnh1 kcnh2 kcnj12 kcnj2