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학술저널
저자정보
In Seok Jeong (Department of Thoracic and Cardiovascular SurgeryChonnam National University Medical SchoolGwangju) 조화진 (전남대학교) Jeong Gwan Cho (Department of Internal MedicineChonnam National University Medical School Gwangju Korea) Sang Hyung Kim (Department of Thoracic and Cardiovascular SurgeryChonnam National University Medical SchoolGwangju) Kook Joo Na (Department of Thoracic and Cardiovascular SurgeryChonnam National University Medical SchoolGwangju) Jong-Keun Kim (Department of Pharmacology Chonnam National University Medical School Gwangju Korea)
저널정보
대한심장학회 Korean Circulation Journal Korean Circulation Journal Vol.46 No.4
발행연도
2016.1
수록면
562 - 568 (7page)

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Background and Objectives: Adenosine triphosphate (ATP)-sensitive potassium (KATP) channels play an important role in myocardial protection. We examined the effects of thromboxane A2 on the regulation of KATP 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 A2 analog, U46619, decreased the KATP channel activity in a dose-dependent manner; however, the thromboxane A2 receptor antagonist, SQ29548, did not significantly attenuate the inhibitory effect of U46619. In the cell-attached patches, U46619 inhibited dinitrophenol (DNP)-induced KATP channel activity in a dose-dependent manner, and SQ29548 attenuated the inhibitory effects of U46619 on DNP-induced KATP channel activity. Conclusion: Thromboxane A2 may inhibit KATP channel activity, and may have a harmful effect on ischemic myocardium.

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