Arylbenzazepines Are Potent Modulators for the Delayed Rectifier K+ Channel: A Potential Mechanism for Their Neuroprotective Effects

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Arylbenzazepines Are Potent Modulators for the Delayed Rectifier K+ Channel: A Potential Mechanism for Their Neuroprotective Effects

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Title: Arylbenzazepines Are Potent Modulators for the Delayed Rectifier K+ Channel: A Potential Mechanism for Their Neuroprotective Effects
Author: Chen, Xue-Qin; Jin, Guo-Zhang; Hu, Guo-Yuan; Zhang, Ao; Zhen, Xuechu; Bernhard, Eric J.; Zhang, Jing; Neumeyer, John Leopold

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Citation: Chen, Xue-Qin, Jing Zhang, John L. Neumeyer, Guo-Zhang Jin, Guo-Yuan Hu, Ao Zhang, and Xuechu Zhen. 2009. Arylbenzazepines are potent modulators for the delayed rectifier K channel: a potential mechanism for their neuroprotective effects. PLoS ONE 4(6): e5811.
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Abstract: (±) SKF83959, like many other arylbenzazepines, elicits powerful neuroprotection in vitro and in vivo. The neuroprotective action of the compound was found to partially depend on its D1-like dopamine receptor agonistic activity. The precise mechanism for the (±) SKF83959-mediated neuroprotection remains elusive. We report here that (±) SKF83959 is a potent blocker for delayed rectifier K+ channel. (±) SKF83959 inhibited the delayed rectifier K+ current (IK) dose-dependently in rat hippocampal neurons. The IC50 value for inhibition of IK was 41.9±2.3 µM (Hill coefficient = 1.81±0.13, n = 6), whereas that for inhibition of IA was 307.9±38.5 µM (Hill coefficient = 1.37±0.08, n = 6). Thus, (±) SKF83959 is 7.3-fold more potent in suppressing IK than IA. Moreover, the inhibition of IK by (±) SKF83959 was voltage-dependent and not related to dopamine receptors. The rapidly onset of inhibition and recovery suggests that the inhibition resulted from a direct interaction of (±) SKF83959 with the K+ channel. The intracellular application of (±) SKF83959 had no effects of on IK, indicating that the compound most likely acts at the outer mouth of the pore of K+ channel. We also tested the enantiomers of (±) SKF83959, R-(+) SKF83959 (MCL-201), and S-(−) SKF83959 (MCL-202), as well as SKF38393; all these compounds inhibited IK. However, (±) SKF83959, at either 0.1 or 1 mM, exhibited the strongest inhibition on the currents among all tested drug. The present findings not only revealed a new potent blocker of IK , but also provided a novel mechanism for the neuroprotective action of arylbenzazepines such as (±) SKF83959.
Published Version: doi:10.1371/journal.pone.0005811
Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2690691/pdf/
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:4633208
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