Clathrodin, hymenidin and oroidin, and their synthetic analogues as inhibitors of the voltage-gated potassium channels
作者:Nace Zidar、Aleš Žula、Tihomir Tomašič、Marc Rogers、Robert W. Kirby、Jan Tytgat、Steve Peigneur、Danijel Kikelj、Janez Ilaš、Lucija Peterlin Mašič
DOI:10.1016/j.ejmech.2017.08.015
日期:2017.10
We have prepared three alkaloids from the Agelas sponges, clathrodin, hymenidin and oroidin, and a series of their synthetic analogues, and evaluated their inhibitory effect against six isoforms of the KO subfamily of voltage-gated potassium channels, g(v)1.1-K(v)1.6, expressed in Chinese Hamster ovary (CHO) cells using automated patch clamp electrophysiology assay. The most potent inhibitor was the (E)-N-(3(2-amino-1H-imidazol-4-yl)ally1)-4,5-dichloro-1H-pyrrole-2-carboxamide (6g) with IC50 values between 1.4 and 6.1 mu M against K(v)1.3, K(v)1.4, K(v)1.5 and K(v)1.6 channels. All compounds tested displayed selectivity against K(v)1.1 and K(v)1.2 channels. For confirmation of their activity and selectivity, compounds were additionally evaluated in the second independent system against K(v)1.1-K(v)1.6 and K(v)10.1 channels expressed in Xenopus laevis oocytes under voltage clamp conditions where IC50 values against K(v)1.3K(v)1.6 channels for the most active analogues (e.g. 6g) were lower than 1 mu M. Because of the observed low sub-micromolar IC50 values and fairly low molecular weights, the prepared compounds represent good starting points for further optimisation towards more potent and selective voltage-gated potassium channel inhibitors. (C) 2017 Elsevier Masson SAS. All rights reserved.