Endocytic Regulation of Voltage-Dependent Potassium Channels in the Heart
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- Ishii Kuniaki
- Department of Pharmacology, Yamagata University School of Medicine, Japan
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- Norota Ikuo
- Department of Pharmacology, Yamagata University School of Medicine, Japan
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- Obara Yutaro
- Department of Pharmacology, Yamagata University School of Medicine, Japan
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Understanding the regulation of cardiac ion channels is critical for the prevention of arrhythmia caused by abnormal excitability. Ion channels can be regulated by a change in function (qualitative) and a change in number (quantitative). Functional changes have been extensively investigated for many ion channels including cardiac voltage-dependent potassium channels. By contrast, the regulation of ion channel numbers has not been widely examined, particularly with respect to acute modulation of ion channels. This article briefly summarizes stimulus-induced endocytic regulation of major voltage-dependent potassium channels in the heart. The stimuli known to cause their endocytosis include receptor activation, drugs, and low extracellular [K+], following which the potassium channels undergo either clathrin-mediated or caveolin-mediated endocytosis. Receptor-mediated endocytic regulation has been demonstrated for Kv1.2, Kv1.5, KCNQ1 (Kv7.1), and Kv4.3, while drug-induced endocytosis has been demonstrated for Kv1.5 and hERG. Low [K+]o–induced endocytosis might be unique for hERG channels, whose electrophysiological characteristics are known to be under strong influence of [K+]o. Although the precise mechanisms have not been elucidated, it is obvious that major cardiac voltage-dependent potassium channels are modulated by endocytosis, which leads to changes in cardiac excitability.
収録刊行物
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- Journal of Pharmacological Sciences
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Journal of Pharmacological Sciences 120 (4), 264-269, 2012
公益社団法人 日本薬理学会
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詳細情報 詳細情報について
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- CRID
- 1390001205178932608
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- NII論文ID
- 10031147574
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- NII書誌ID
- AA11806667
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- COI
- 1:CAS:528:DC%2BC3sXktV2i
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- ISSN
- 13478648
- 13478613
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- NDL書誌ID
- 024148576
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- PubMed
- 23165803
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 使用不可