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http://dx.doi.org/10.4070/kcj.2016.46.4.562

Influence of Thromboxane A2 on the Regulation of Adenosine Triphosphate-Sensitive Potassium Channels in Mouse Ventricular Myocytes  

Jeong, In Seok (Department of Thoracic and Cardiovascular Surgery, Chonnam National University Medical School)
Cho, Hwa Jin (Department of Pediatrics, Chonnam National University Medical School)
Cho, Jeong Gwan (Department of Internal Medicine, Chonnam National University Medical School)
Kim, Sang Hyung (Department of Thoracic and Cardiovascular Surgery, Chonnam National University Medical School)
Na, Kook Joo (Department of Thoracic and Cardiovascular Surgery, Chonnam National University Medical School)
Kim, Jong-Keun (Department of Pharmacology, Chonnam National University Medical School)
Publication Information
Korean Circulation Journal / v.46, no.4, 2016 , pp. 562-568 More about this Journal
Abstract
Background and Objectives: Adenosine triphosphate (ATP)-sensitive potassium ($K_{ATP}$) channels play an important role in myocardial protection. We examined the effects of thromboxane $A_2$ on the regulation of $K_{ATP}$ channel activity in single ventricular myocytes. Materials and Methods: Single ventricular myocytes were isolated from the hearts of adult Institute of Cancer Research (ICR) mice by enzymatic digestion. Single channel activity was recorded by excised inside-out and cell-attached patch clamp configurations at -60 mV holding potential during the perfusion of an ATP-free K-5 solution. Results: In the excised inside-out patches, the thromboxane $A_2$ analog, U46619, decreased the $K_{ATP}$ channel activity in a dose-dependent manner; however, the thromboxane $A_2$ receptor antagonist, SQ29548, did not significantly attenuate the inhibitory effect of U46619. In the cell-attached patches, U46619 inhibited dinitrophenol (DNP)-induced $K_{ATP}$ channel activity in a dose-dependent manner, and SQ29548 attenuated the inhibitory effects of U46619 on DNP-induced $K_{ATP}$ channel activity. Conclusion: Thromboxane $A_2$ may inhibit $K_{ATP}$ channel activity, and may have a harmful effect on ischemic myocardium.
Keywords
KATP channels; Thromboxane $A_2$; Myocytes; Cardiac;
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