Characterization of chromanol 293B-induced block of the delayed-rectifier K+ current in heart-derived H9c2 cells

Yi Ching Lo, Su Rong Yang, Mei Han Huang, Yen Chin Liu, Sheng Nan Wu

研究成果: Article同行評審

9 引文 斯高帕斯(Scopus)

摘要

The effects of chromanol 293B on ion currents in rat embryonic heart-derived H9c2 cells were investigated in this study. Chromanol 293B suppressed the amplitude of delayed rectified K+ current (I K) in a concentration-dependent manner. The IC50 value for chromanol 293B-induced inhibition of IK was 8 μM. The I K present in these cells, the electrical properties of which resembled those for the Kv2.1-related K+ current, was sensitive to inhibition by quinidine or dendrotoxin, yet not by pandinotoxin-Kα, E-4031 or apamin. Chromanol 293B reduced the activation time constant of IK and the effective gating charge of this channel. However, little or no modification in the steady-state inactivation of IK in response to long-lasting conditioning pulses could be demonstrated in the presence of chromanol 293B. These results clearly demonstrate that chromanol 293B can effectively interact with the K+ channel functionally expressed in H9c2 myoblasts. The chromanol 293B-induced inhibition of these channels could primarily be attributed to open channel block.

原文English
頁(從 - 到)2275-2286
頁數12
期刊Life Sciences
76
發行號20
DOIs
出版狀態Published - 2005 四月 1

All Science Journal Classification (ASJC) codes

  • 生物化學、遺傳與分子生物學 (全部)
  • 藥理學、毒理學和藥劑學 (全部)

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