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Park S, Kang M, Heo R, Mun SY, Park M, Han ET, Han JH, Chun W, Park H, Park WS. Inhibition of voltage-dependent K + channels by antimuscarinic drug fesoterodine in coronary arterial smooth muscle cells. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY 2022; 26:397-404. [PMID: 36039740 PMCID: PMC9437370 DOI: 10.4196/kjpp.2022.26.5.397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/08/2022] [Accepted: 08/08/2022] [Indexed: 11/25/2022]
Abstract
Fesoterodine, an antimuscarinic drug, is widely used to treat overactive bladder syndrome. However, there is little information about its effects on vascular K+ channels. In this study, voltage-dependent K+ (Kv) channel inhibition by fesoterodine was investigated using the patch-clamp technique in rabbit coronary artery. In whole-cell patches, the addition of fesoterodine to the bath inhibited the Kv currents in a concentration-dependent manner, with an IC50 value of 3.19 ± 0.91 μM and a Hill coefficient of 0.56 ± 0.03. Although the drug did not alter the voltage-dependence of steady-state activation, it shifted the steady-state inactivation curve to a more negative potential, suggesting that fesoterodine affects the voltage-sensor of the Kv channel. Inhibition by fesoterodine was significantly enhanced by repetitive train pulses (1 or 2 Hz). Furthermore, it significantly increased the recovery time constant from inactivation, suggesting that the Kv channel inhibition by fesoterodine is use (state)-dependent. Its inhibitory effect disappeared by pretreatment with a Kv 1.5 inhibitor. However, pretreatment with Kv2.1 or Kv7 inhibitors did not affect the inhibitory effects on Kv channels. Based on these results, we conclude that fesoterodine inhibits vascular Kv channels (mainly the Kv1.5 subtype) in a concentration- and use (state)-dependent manner, independent of muscarinic receptor antagonism.
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Affiliation(s)
- Seojin Park
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Minji Kang
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Ryeon Heo
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Seo-Yeong Mun
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Minju Park
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Eun-Taek Han
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Jin-Hee Han
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Wanjoo Chun
- Department of Pharmacology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Hongzoo Park
- Institute of Medical Sciences, Department of Urology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Won Sun Park
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
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Kang M, Heo R, Park S, Mun SY, Park M, Han ET, Han JH, Chun W, Ha KS, Park H, Jung WK, Choi IW, Park WS. Inhibitory effects of the atypical antipsychotic, clozapine, on voltage-dependent K + channels in rabbit coronary arterial smooth muscle cells. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2022; 26:277-285. [PMID: 35766005 PMCID: PMC9247706 DOI: 10.4196/kjpp.2022.26.4.277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 05/10/2022] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
To investigate the adverse effects of clozapine on cardiovascular ion channels, we examined the inhibitory effect of clozapine on voltage-dependent K+ (Kv) channels in rabbit coronary arterial smooth muscle cells. Clozapine-induced inhibition of Kv channels occurred in a concentration-dependent manner with an half-inhibitory concentration value of 7.84 ± 4.86 µM and a Hill coefficient of 0.47 ± 0.06. Clozapine did not shift the steady-state activation or inactivation curves, suggesting that it inhibited Kv channels regardless of gating properties. Application of train pulses (1 and 2 Hz) progressively augmented the clozapine-induced inhibition of Kv channels in the presence of the drug. Furthermore, the recovery time constant from inactivation was increased in the presence of clozapine, suggesting that clozapine-induced inhibition of Kv channels is use (state)-dependent. Pretreatment of a Kv1.5 subtype inhibitor decreased the Kv current amplitudes, but additional application of clozapine did not further inhibit the Kv current. Pretreatment with Kv2.1 or Kv7 subtype inhibitors partially blocked the inhibitory effect of clozapine. Based on these results, we conclude that clozapine inhibits arterial Kv channels in a concentrationand use (state)-dependent manner. Kv1.5 is the major subtype involved in clozapine-induced inhibition of Kv channels, and Kv2.1 and Kv7 subtypes are partially involved.
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Affiliation(s)
- Minji Kang
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Ryeon Heo
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Seojin Park
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Seo-Yeong Mun
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Minju Park
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Eun-Taek Han
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Jin-Hee Han
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Wanjoo Chun
- Department of Pharmacology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Kwon-Soo Ha
- Department of Molecular and Cellular Biochemistry, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Hongzoo Park
- Institute of Medical Sciences, Department of Urology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
| | - Won-Kyo Jung
- Department of Biomedical Engineering and Center for Marine-Integrated Biomedical Technology (BK21 Plus), Pukyong National University, Busan 48513, Korea
| | - Il-Whan Choi
- Department of Microbiology, College of Medicine, Inje University, Busan 48516, Korea
| | - Won Sun Park
- Institute of Medical Sciences, Department of Physiology, Kangwon National University School of Medicine, Chuncheon 24341, Korea
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Li H, Zhuang W, Seo MS, An JR, Yang Y, Zha Y, Liang J, Xu ZX, Park WS. Inhibition of voltage-dependent K + channels in rabbit coronary arterial smooth muscle cells by the class Ic antiarrhythmic agent lorcainide. Eur J Pharmacol 2021; 904:174158. [PMID: 33971179 DOI: 10.1016/j.ejphar.2021.174158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 04/22/2021] [Accepted: 05/04/2021] [Indexed: 10/21/2022]
Abstract
Voltage-dependent K+ (Kv) channels play the role of returning the membrane potential to the resting state, thereby maintaining the vascular tone. Here, we used native smooth-muscle cells from rabbit coronary arteries to investigate the inhibitory effect of lorcainide, a class Ic antiarrhythmic agent, on Kv channels. Lorcainide inhibited Kv channels in a concentration-dependent manner with an IC50 of 4.46 ± 0.15 μM and a Hill coefficient of 0.95 ± 0.01. Although application of lorcainide did not change the activation curve, it shifted the inactivation curve toward a more negative potential, implying that lorcainide inhibits Kv channels by changing the channels' voltage sensors. The recovery time constant from channel inactivation increased in the presence of lorcainide. Furthermore, application of train steps (of 1 or 2 Hz) in the presence of lorcainide progressively augmented the inhibition of Kv currents, implying that lorcainide-induced inhibition of Kv channels is use (state)-dependent. Pretreatment with Kv1.5 or Kv2.1/2.2 inhibitors effectively reduced the amplitude of the Kv current but did not affect the inhibitory effect of lorcainide. Based on these results, we conclude that lorcainide inhibits vascular Kv channels in a concentration and use (state)-dependent manner by changing their inactivation gating properties. Considering the clinical efficacy of lorcainide, and the pathophysiological significance of vascular Kv channels, our findings should be considered when prescribing lorcainide to patients with arrhythmia and vascular disease.
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Affiliation(s)
- Hongliang Li
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, 225001, Jiangsu, China; Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment for Senile Diseases, Yangzhou University, Yangzhou, 225001, China
| | - Wenwen Zhuang
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, 225001, Jiangsu, China
| | - Mi Seon Seo
- Department of Physiology, Kangwon National University School of Medicine, Chuncheon, 24341, South Korea
| | - Jin Ryeol An
- Department of Physiology, Kangwon National University School of Medicine, Chuncheon, 24341, South Korea
| | - Yongqi Yang
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, 225001, Jiangsu, China
| | - Yiwen Zha
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, 225001, Jiangsu, China
| | - Jingyan Liang
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, 225001, Jiangsu, China.
| | - Zheng-Xin Xu
- Department of Pharmacology, School of Medicine, Yangzhou University, Yangzhou, 225000, Jiangsu, China.
| | - Won Sun Park
- Department of Physiology, Kangwon National University School of Medicine, Chuncheon, 24341, South Korea.
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Kim SE, Yin MZ, Kim HJ, Vorn R, Yoo HY, Kim SJ. Decreased inward rectifier and voltage-gated K + currents of the right septal coronary artery smooth muscle cells in pulmonary arterial hypertensive rats. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2020; 24:111-119. [PMID: 31908580 PMCID: PMC6940494 DOI: 10.4196/kjpp.2020.24.1.111] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 11/28/2019] [Accepted: 11/28/2019] [Indexed: 11/15/2022]
Abstract
In vascular smooth muscle, K+ channels, such as voltage-gated K+ channels (Kv), inward-rectifier K+ channels (Kir), and big-conductance Ca2+-activated K+ channels (BKCa), establish a hyperpolarized membrane potential and counterbalance the depolarizing vasoactive stimuli. Additionally, Kir mediates endothelium-dependent hyperpolarization and the active hyperemia response in various vessels, including the coronary artery. Pulmonary arterial hypertension (PAH) induces right ventricular hypertrophy (RVH), thereby elevating the risk of ischemia and right heart failure. Here, using the whole-cell patch-clamp technique, we compared Kv and Kir current densities (IKv and IKir) in the left (LCSMCs), right (RCSMCs), and septal branches of coronary smooth muscle cells (SCSMCs) from control and monocrotaline (MCT)-induced PAH rats exhibiting RVH. In control rats, (1) IKv was larger in RCSMCs than that in SCSMCs and LCSMCs, (2) IKv inactivation occurred at more negative voltages in SCSMCs than those in RCSMCs and LCSMCs, (3) IKir was smaller in SCSMCs than that in RCSMCs and LCSMCs, and (4) IBKCa did not differ between branches. Moreover, in PAH rats, IKir and IKv decreased in SCSMCs, but not in RCSMCs or LCSMCs, and IBKCa did not change in any of the branches. These results demonstrated that SCSMC-specific decreases in IKv and IKir occur in an MCT-induced PAH model, thereby offering insights into the potential pathophysiological implications of coronary blood flow regulation in right heart disease. Furthermore, the relatively smaller IKir in SCSMCs suggested a less effective vasodilatory response in the septal region to the moderate increase in extracellular K+ concentration under increased activity of the myocardium.
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Affiliation(s)
- Sung Eun Kim
- Department of Physiology, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Ming Zhe Yin
- Department of Physiology, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Hae Jin Kim
- Department of Physiology, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Rany Vorn
- Department of Nursing, Chung-Ang University, Seoul 06974, Korea
| | - Hae Young Yoo
- Department of Nursing, Chung-Ang University, Seoul 06974, Korea
| | - Sung Joon Kim
- Department of Physiology, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea.,Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul 03080, Korea
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5
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Li H, Seo MS, An JR, Jung HS, Ha K, Han E, Hong S, Bae YM, Ryu DR, Park WS. The anticholinergic drug oxybutynin inhibits voltage‐dependent K
+
channels in coronary arterial smooth muscle cells. Clin Exp Pharmacol Physiol 2019; 46:1030-1036. [DOI: 10.1111/1440-1681.13138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 07/16/2019] [Indexed: 11/29/2022]
Affiliation(s)
- Hongliang Li
- Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment for Senile Diseases Institute of Translational Medicine Medical College Yangzhou University Yangzhou China
| | - Mi Seon Seo
- Department of Physiology Institute of Medical Sciences Kangwon National University, School of Medicine Chuncheon South Korea
| | - Jin Ryeol An
- Department of Physiology Institute of Medical Sciences Kangwon National University, School of Medicine Chuncheon South Korea
| | - Hee Seok Jung
- Department of Physiology Institute of Medical Sciences Kangwon National University, School of Medicine Chuncheon South Korea
| | - Kwon‐Soo Ha
- Department of Molecular and Cellular Biochemistry Kangwon National University School of Medicine Chuncheon South Korea
| | - Eun‐Taek Han
- Department of Medical Environmental Biology and Tropical Medicine Kangwon National University School of Medicine Chuncheon South Korea
| | - Seok‐Ho Hong
- Department of Internal Medicine Institute of Medical Sciences Kangwon National University School of Medicine Chuncheon South Korea
| | - Young Min Bae
- Department of Physiology Konkuk University School of Medicine Chungju South Korea
| | - Dong Ryeol Ryu
- Division of Cardiology Department of Internal Medicine Institute of Medical Sciences Kangwon National University Hospital Kangwon National University School of Medicine Chuncheon South Korea
| | - Won Sun Park
- Department of Physiology Institute of Medical Sciences Kangwon National University, School of Medicine Chuncheon South Korea
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