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Findlay I, Pasqualin C, Yu A, Maupoil V, Bredeloux P. Selective Inhibition of Pulmonary Vein Excitability by Constitutively Active GIRK Channels Blockade in Rats. Int J Mol Sci 2023; 24:13629. [PMID: 37686437 PMCID: PMC10487709 DOI: 10.3390/ijms241713629] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 08/25/2023] [Accepted: 09/01/2023] [Indexed: 09/10/2023] Open
Abstract
Pulmonary veins (PV) are the main source of ectopy, triggering atrial fibrillation. This study investigated the roles of G protein-coupled inwardly rectifying potassium (GIRK) channels in the PV and the left atrium (LA) of the rat. Simultaneous intracellular microelectrode recording from the LA and the PV of the rat found that in the presence or absence of acetylcholine, the GIRK channel blocker tertiapin-Q induced AP duration elongation in the LA and the loss of over-shooting AP in the PV, suggesting the presence of constitutively active GIRK channels in these tissues. Patch-clamp recordings from isolated myocytes showed that tertiapin-Q inhibited a basal inwardly rectified background current in PV cells with little effect in LA cells. Experiments with ROMK1 and KCa1.1 channel blockers ruled out the possibility of an off-target effect. Western blot showed that GIRK4 subunit expression was greater in PV cardiomyocytes, which may explain the differences observed between PV and LA in response to tertiapin-Q. In conclusion, GIRK channels blockade abolishes AP only in the PV, providing a molecular target to induce electrical disconnection of the PV from the LA.
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Affiliation(s)
- Ian Findlay
- Laboratoire de Pharmacologie, Faculté de Pharmacie, Université de Tours, 37200 Tours, France;
| | - Côme Pasqualin
- EA4245, Transplantation, Immunologie et Inflammation, Université de Tours, 37200 Tours, France; (C.P.); (A.Y.); (V.M.)
| | - Angèle Yu
- EA4245, Transplantation, Immunologie et Inflammation, Université de Tours, 37200 Tours, France; (C.P.); (A.Y.); (V.M.)
| | - Véronique Maupoil
- EA4245, Transplantation, Immunologie et Inflammation, Université de Tours, 37200 Tours, France; (C.P.); (A.Y.); (V.M.)
| | - Pierre Bredeloux
- EA4245, Transplantation, Immunologie et Inflammation, Université de Tours, 37200 Tours, France; (C.P.); (A.Y.); (V.M.)
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2
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Aimoto M, Yagi K, Ezawa A, Tsuneoka Y, Kumada K, Hasegawa T, Kuze T, Chiba T, Nagasawa Y, Tanaka H, Takahara A. Chronic Volume Overload Caused by Abdominal Aorto-Venocaval Shunt Provides Arrhythmogenic Substrates in the Rat Atrium. Biol Pharm Bull 2022; 45:635-642. [DOI: 10.1248/bpb.b22-00031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Megumi Aimoto
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University
| | - Keita Yagi
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University
| | - Aya Ezawa
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University
| | - Yayoi Tsuneoka
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Kohei Kumada
- Department of R&D, Fukushima Research Laboratories, TOA EIYO LTD
| | - Takeshi Hasegawa
- Department of R&D, Fukushima Research Laboratories, TOA EIYO LTD
| | - Tetsuo Kuze
- Department of R&D, Fukushima Research Laboratories, TOA EIYO LTD
| | - Toshiki Chiba
- Department of R&D, Fukushima Research Laboratories, TOA EIYO LTD
| | - Yoshinobu Nagasawa
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University
| | - Hikaru Tanaka
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Akira Takahara
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University
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Irie M, Hiiro H, Kato S, Kuramochi M, Hamaguchi S, Namekata I, Tanaka H. Differential effects of class I antiarrhythmic drugs on the guinea pig pulmonary vein myocardium: Inhibition of automatic activity correlates with blockade of a diastolic sodium current component. J Pharmacol Sci 2020; 143:325-329. [PMID: 32487451 DOI: 10.1016/j.jphs.2020.05.004] [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: 01/24/2020] [Revised: 04/17/2020] [Accepted: 05/07/2020] [Indexed: 10/24/2022] Open
Abstract
The effects of class I antiarrhythmic drugs on the automaticity of isolated guinea pig pulmonary vein myocardia were investigated using microelectrode and voltage clamp methods. All of the drugs examined reduced the maximum rate of rise of automatic action potentials. The firing frequency and rate of diastolic depolarization were decreased by aprindine, flecainide and propafenone, but not by cibenzoline, disopyramide and pilsicainide, which correlated with blockade of the sodium current component induced by ramp depolarization mimicking the diastolic depolarization. In conclusion, class I antiarrhythmic drugs which block the diastolic sodium current component inhibit the automaticity of the pulmonary vein myocardium.
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Affiliation(s)
- Masahiko Irie
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, 274-8510, Japan
| | - Haruhito Hiiro
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, 274-8510, Japan
| | - Shu Kato
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, 274-8510, Japan
| | - Mizuki Kuramochi
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, 274-8510, Japan
| | - Shogo Hamaguchi
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, 274-8510, Japan
| | - Iyuki Namekata
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, 274-8510, Japan.
| | - Hikaru Tanaka
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, 274-8510, Japan
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4
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Cao X, Nagasawa Y, Zhang C, Zhang H, Aimoto M, Takahara A. Acehytisine suppresses atrial fibrillation in rats with dilated atria caused by chronic volume overload. J Pharmacol Sci 2019; 142:34-40. [PMID: 31791657 DOI: 10.1016/j.jphs.2019.11.003] [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: 08/07/2019] [Revised: 10/25/2019] [Accepted: 11/07/2019] [Indexed: 10/25/2022] Open
Abstract
Atrial dilation is an independent risk factor for the development of atrial fibrillation (AF) and modulates the efficacy of anti-AF drugs, leading to the unsatisfactory control of AF. Pre-clinical studies showed anti-AF effects of acehytisine, a multi-ion channel inhibitor, in atria without structural and/or electrophysiological abnormalities, but information is limited regarding its anti-AF efficacy in dilated atria. We evaluated anti-AF effects of acehytisine at 4 and 10 mg/kg intravenously infused over 10 min using 8-week-old Wistar rats (n = 5; male) with atrial dilation caused by aorto-venocaval shunt (AVS). Echocardiography showed that atria were enlarged by +26.9% after one month of operation in AVS rats compared with sham-operated rats (n = 4; male). Electrophysiological examinations indicated burst pacing-induced AF reached 206 s. Acehytisine at doses of 4 and 10 mg/kg decreased the duration of burst pacing-induced AF with prolongation of Wenckebach cycle length and P wave duration in a dose-dependent manner. Importantly, the drug effectively terminated the persistent AF that was resistant to multiple programmed electrical stimulations in one rat. Therefore, these results provide in vivo evidence that acehytisine may be beneficial for preventing and terminating persistent AF in dilated atria.
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Affiliation(s)
- Xin Cao
- Acupuncture and Tuina School/Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, 37 Shierqiao Road, Jinniu District, Chengdu 610075, Sichuan Province, China; Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
| | - Yoshinobu Nagasawa
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Chengshun Zhang
- Acupuncture and Tuina School/Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, 37 Shierqiao Road, Jinniu District, Chengdu 610075, Sichuan Province, China
| | - Hanxiao Zhang
- Acupuncture and Tuina School/Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, 37 Shierqiao Road, Jinniu District, Chengdu 610075, Sichuan Province, China
| | - Megumi Aimoto
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Akira Takahara
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
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Angiotensin II Induces Automatic Activity of the Isolated Guinea Pig Pulmonary Vein Myocardium through Activation of the IP₃ Receptor and the Na⁺-Ca 2+ Exchanger. Int J Mol Sci 2019; 20:ijms20071768. [PMID: 30974804 PMCID: PMC6479489 DOI: 10.3390/ijms20071768] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 04/01/2019] [Accepted: 04/05/2019] [Indexed: 11/16/2022] Open
Abstract
The automaticity of the pulmonary vein myocardium is known to be the major cause of atrial fibrillation. We examined the involvement of angiotensin II in the automatic activity of isolated guinea pig pulmonary vein preparations. In tissue preparations, application of angiotensin II induced an automatic contractile activity; this effect was mimicked by angiotensin I and blocked by losartan, but not by PD123,319 or carvedilol. In cardiomyocytes, application of angiotensin II induced an increase in the frequency of spontaneous Ca2+ sparks and the generation of Ca2+ transients; these effects were inhibited by losartan or xestospongin C. In tissue preparations, angiotensin II caused membrane potential oscillations, which lead to repetitive generation of action potentials. Angiotensin II increased the diastolic depolarization slope of the spontaneous or evoked action potentials. These effects of angiotensin II were inhibited by SEA0400. In tissue preparations showing spontaneous firing of action potentials, losartan, xestospongin C or SEA0400 decreased the slope of the diastolic depolarization and inhibited the firing of action potentials. In conclusion, in the guinea pig pulmonary vein myocardium, angiotensin II induces the generation of automatic activity through activation of the IP3 receptor and the Na+-Ca2+ exchanger.
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Cao X, Aimoto M, Fukumoto M, Nagasawa Y, Tanaka H, Takahara A. Influence of chronic volume overload-induced atrial remodeling on electrophysiological responses to cholinergic receptor stimulation in the isolated rat atria. J Pharmacol Sci 2018; 136:73-78. [DOI: 10.1016/j.jphs.2017.12.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 12/08/2017] [Accepted: 12/26/2017] [Indexed: 11/29/2022] Open
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Irie M, Tsuneoka Y, Shimobayashi M, Hasegawa N, Tanaka Y, Mochizuki S, Ichige S, Hamaguchi S, Namekata I, Tanaka H. Involvement of alpha- and beta-adrenoceptors in the automaticity of the isolated guinea pig pulmonary vein myocardium. J Pharmacol Sci 2017; 133:247-253. [PMID: 28410967 DOI: 10.1016/j.jphs.2017.03.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 03/10/2017] [Accepted: 03/14/2017] [Indexed: 01/12/2023] Open
Abstract
We examined the involvement of adrenoceptors in the automaticity of the pulmonary vein myocardium, which probably plays a crucial role in the generation of atrial fibrillation. The automatic activity of the myocardium in guinea pig pulmonary vein tissue preparations were monitored by contractile force or membrane potential measurement. In quiescent preparations, application of noradrenaline induced an automatic activity. The firing frequency was reduced by prazosin or atenolol. Methoxamine induced an automatic activity of low frequency, which was accelerated by further application of isoproterenol. In preparations driven at a constant frequency, noradrenaline, in the presence of atenolol, caused a depolarizing shift of the resting membrane potential and an increase in the slope of the diastolic depolarization. In contrast, in the presence of prazosin, noradrenaline had no effect on the slope, but caused acceleration of the late repolarization and a hyperpolarizing shift of the maximum diastolic potential. At clinically relevant concentrations, carvedilol significantly inhibited the noradrenaline-induced activity but bisoprolol did not. It was concluded that α1- and β1-adrenoceptor stimulation enhance automaticity through different mechanisms in the guinea pig pulmonary vein myocardium. Dual blockade of these adrenoceptors appears to be effective for suppressing noradrenaline-induced pulmonary vein automaticity and probably atrial fibrillation.
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Affiliation(s)
- Masahiko Irie
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Yayoi Tsuneoka
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan; Laboratory of Pharmacology, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - Mariko Shimobayashi
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Nao Hasegawa
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Yusuke Tanaka
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Soh Mochizuki
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Sho Ichige
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Shogo Hamaguchi
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan.
| | - Iyuki Namekata
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Hikaru Tanaka
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan
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8
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Hamaguchi S, Hikita K, Tanaka Y, Tsuneoka Y, Namekata I, Tanaka H. Enhancement of Automaticity by Mechanical Stretch of the Isolated Guinea Pig Pulmonary Vein Myocardium. Biol Pharm Bull 2016; 39:1216-9. [DOI: 10.1248/bpb.b15-01013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Shogo Hamaguchi
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Koh Hikita
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Yusuke Tanaka
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Yayoi Tsuneoka
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
- Laboratory of Pharmacology, Faculty of Pharmaceutical Sciences, Tokyo University of Science
| | - Iyuki Namekata
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Hikaru Tanaka
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
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