SKF-96365 blocks human ether-à-go-go-related gene potassium channels stably expressed in HEK 293 cells

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• 作者：Hui Liu^a ; ^c ; ¹ ; Lei Yang^b ; ^c ; ¹ ; Kui-Hao Chen^a ; ^c ; Hai-Ying Sun^c ; Man-Wen Jin^a ; Guo-Sheng Xiao^d ; Yan Wang^d ; ^{wy@medmail.com.cn" class="auth_mail" title="E-mail the corresponding author} ; Gui-Rong Li^c ; ^d ; ^{grli8@outlook.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：SK-96365 (1-[2-(4-Methoxyphenyl)-2-[3-(4-methoxyphenyl) propoxy]ethyl]imidazole) (PubChem CID ; 104956) ; Dimethyl sulfoxide (PubChem CID ; 679) ; G418 sulfate (PubChem CID ; 86605443) ; Pentobarbital sodium (PubChem CID ; 23676152)
• 刊名：Pharmacological Research
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：104
• 期：Complete
• 页码：61-69
• 全文大小：2325 K

文摘

SKF-96365 is a TRPC channel antagonist commonly used to characterize the potential functions of TRPC channels in different systems, which was recently reported to induce QTc prolongation on ECG by inhibiting TRPC channels. The present study investigates whether the blockade of cardiac repolarization currents would be involved in the increase of QTc interval. Cardiac repolarization currents were recorded in HEK 293 cells stably expressing human ether-à-go-go-related gene potassium (hERG or hKv11.1) channels, hKCNQ1/hKCNE1 channels (I_Ks) or hKir2.1 channels and cardiac action potentials were recorded in guinea pig ventricular myocytes using a whole-cell patch technique. The potential effect of SKF-96365 on QT interval was evaluated in ex vivo guinea pig hearts. It was found that SKF-96365 inhibited hERG current in a concentration-dependent manner (IC₅₀, 3.4 μM). The hERG mutants S631A in the pore helix and F656 V of the S6 region reduced the inhibitory sensitivity with IC₅₀s of 27.4 μM and 11.0 μM, suggesting a channel pore blocker. In addition, this compound inhibited I_Ks and hKir2.1currents with IC₅₀s of 10.8 and 8.7 μM. SKF-96365 (10 μM) significantly prolonged ventricular APD₉₀ in guinea pig ventricular myocytes and QTc interval in ex vivo guinea pig hearts. These results indicate that the TRPC channel antagonist SKF-96365 exerts blocking effects on hERG, I_Ks, and hKir2.1 channels. Prolongation of ventricular APD and QT interval is related to the inhibition of multiple repolarization potassium currents, especially hERG channels.