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Wrzosek A, Gałecka S, Żochowska M, Olszewska A, Kulawiak B. Alternative Targets for Modulators of Mitochondrial Potassium Channels. Molecules 2022; 27:299. [PMID: 35011530 PMCID: PMC8746388 DOI: 10.3390/molecules27010299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 12/30/2021] [Accepted: 12/31/2021] [Indexed: 12/17/2022] Open
Abstract
Mitochondrial potassium channels control potassium influx into the mitochondrial matrix and thus regulate mitochondrial membrane potential, volume, respiration, and synthesis of reactive oxygen species (ROS). It has been found that pharmacological activation of mitochondrial potassium channels during ischemia/reperfusion (I/R) injury activates cytoprotective mechanisms resulting in increased cell survival. In cancer cells, the inhibition of these channels leads to increased cell death. Therefore, mitochondrial potassium channels are intriguing targets for the development of new pharmacological strategies. In most cases, however, the substances that modulate the mitochondrial potassium channels have a few alternative targets in the cell. This may result in unexpected or unwanted effects induced by these compounds. In our review, we briefly present the various classes of mitochondrial potassium (mitoK) channels and describe the chemical compounds that modulate their activity. We also describe examples of the multidirectional activity of the activators and inhibitors of mitochondrial potassium channels.
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Affiliation(s)
- Antoni Wrzosek
- Laboratory of Intracellular Ion Channels, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 02-093 Warsaw, Poland; (A.W.); (S.G.); (M.Ż.)
| | - Shur Gałecka
- Laboratory of Intracellular Ion Channels, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 02-093 Warsaw, Poland; (A.W.); (S.G.); (M.Ż.)
| | - Monika Żochowska
- Laboratory of Intracellular Ion Channels, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 02-093 Warsaw, Poland; (A.W.); (S.G.); (M.Ż.)
| | - Anna Olszewska
- Department of Histology, Medical University of Gdansk, 1a Debinki, 80-211 Gdansk, Poland;
| | - Bogusz Kulawiak
- Laboratory of Intracellular Ion Channels, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 02-093 Warsaw, Poland; (A.W.); (S.G.); (M.Ż.)
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Huang H, Pugsley MK, Fermini B, Curtis MJ, Koerner J, Accardi M, Authier S. Cardiac voltage-gated ion channels in safety pharmacology: Review of the landscape leading to the CiPA initiative. J Pharmacol Toxicol Methods 2017; 87:11-23. [PMID: 28408211 DOI: 10.1016/j.vascn.2017.04.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Revised: 03/27/2017] [Accepted: 04/06/2017] [Indexed: 12/15/2022]
Abstract
Voltage gated ion channels are central in defining the fundamental properties of the ventricular cardiac action potential (AP), and are also involved in the development of drug-induced arrhythmias. Many drugs can inhibit cardiac ion currents, including the Na+ current (INa), L-type Ca2+ current (Ica-L), and K+ currents (Ito, IK1, IKs, and IKr), and thereby affect AP properties in a manner that can trigger or sustain cardiac arrhythmias. Since publication of ICH E14 and S7B over a decade ago, there has been a focus on drug effects on QT prolongation clinically, and on the rapidly activating delayed rectifier current (IKr), nonclinically, for evaluation of proarrhythmic risk. This focus on QT interval prolongation and a single ionic current likely impacted negatively some drugs that lack proarrhythmic liability in humans. To rectify this issue, the Comprehensive in vitro proarrhythmia assay (CiPA) initiative has been proposed to integrate drug effects on multiple cardiac ionic currents with in silico modelling of human ventricular action potentials, and in vitro data obtained from human stem cell-derived ventricular cardiomyocytes to estimate proarrhythmic risk of new drugs with improved accuracy. In this review, we present the physiological functions and the molecular basis of major cardiac ion channels that contribute to the ventricle AP, and discuss the CiPA paradigm in drug development.
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Affiliation(s)
- Hai Huang
- CiToxLAB North America, 445, Armand-Frappier Boul, Laval H7V 4B3, QC, Canada
| | - Michael K Pugsley
- Department of Toxicology, Purdue Pharma L.P., Cranbury, NJ 08512, USA
| | | | - Michael J Curtis
- Cardiovascular Division, Faculty of Life Sciences & Medicine, King's College London, Rayne Institute, St Thomas' Hospital, London SE17EH, UK
| | - John Koerner
- Center for Drug Evaluation and Research, US Food and Drug Administration, Silver Spring, MD 20993, USA
| | - Michael Accardi
- CiToxLAB North America, 445, Armand-Frappier Boul, Laval H7V 4B3, QC, Canada
| | - Simon Authier
- CiToxLAB North America, 445, Armand-Frappier Boul, Laval H7V 4B3, QC, Canada.
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Ozawa M, Komatsu T, Sato Y, Kunugita F, Tachibana H, Tashiro A, Okabayashi H, Nakamura M. Comparison of the effects of bepridil and aprindine for the prevention of atrial fibrillation after cardiac and aortic surgery: A prospective randomized study. J Arrhythm 2015; 31:302-6. [PMID: 26550087 PMCID: PMC4600894 DOI: 10.1016/j.joa.2015.04.003] [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: 01/12/2015] [Revised: 04/01/2015] [Accepted: 04/05/2015] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Approximately one-third of the patients undergoing cardiovascular surgery reportedly experience paroxysmal atrial fibrillation (AF) during the postoperative period. However, the usefulness of antiarrhythmic drugs for preventing postoperative AF recurrence in the Japanese population has not been extensively studied. METHODS From a total of 118 patients who developed postoperative paroxysmal AF between April 2009 and March 2011, 72 patients (45 men, mean age 68±8 years) requiring treatment for postoperative AF due to symptoms lasting ≥30 min were enrolled to prospectively investigate the efficacy of oral bepridil (100 mg/day, n=37) or aprindine (40 mg/day, n=35). RESULT The AF recurrence-free survival rates at 1, 3, 7, and 14 days were 100%, 94%, 57%, and 49%, respectively, in the aprindine group, and 100%, 97%, 86%, and 76%, respectively, in the bepridil group (P=0.028, aprindine vs. bepridil). CONCLUSION Bepridil, at a fixed dose of 100 mg/day, was considered to be more effective than a routine dose of aprindine for the prevention of postoperative AF recurrence.
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Affiliation(s)
- Mahito Ozawa
- Division of Cardioangiology, Nephrology and Endocrinology, Department of Internal Medicine and Memorial Heart Center, Iwate Medical University School of Medicine, Morioka, Japan
| | - Takashi Komatsu
- Division of Cardioangiology, Nephrology and Endocrinology, Department of Internal Medicine and Memorial Heart Center, Iwate Medical University School of Medicine, Morioka, Japan
| | - Yoshihiro Sato
- Division of Cardioangiology, Nephrology and Endocrinology, Department of Internal Medicine and Memorial Heart Center, Iwate Medical University School of Medicine, Morioka, Japan
| | - Fusanori Kunugita
- Division of Cardioangiology, Nephrology and Endocrinology, Department of Internal Medicine and Memorial Heart Center, Iwate Medical University School of Medicine, Morioka, Japan
| | - Hideaki Tachibana
- Division of Cardioangiology, Nephrology and Endocrinology, Department of Internal Medicine and Memorial Heart Center, Iwate Medical University School of Medicine, Morioka, Japan
| | - Atsushi Tashiro
- Division of Cardioangiology, Nephrology and Endocrinology, Department of Internal Medicine and Memorial Heart Center, Iwate Medical University School of Medicine, Morioka, Japan
| | - Hitoshi Okabayashi
- Department of Cardiovascular Surgery, Iwate Medical University School of Medicine, Morioka, Japan
| | - Motoyuki Nakamura
- Division of Cardioangiology, Nephrology and Endocrinology, Department of Internal Medicine and Memorial Heart Center, Iwate Medical University School of Medicine, Morioka, Japan
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Kurokawa S, Niwano S, Kiryu M, Murakami M, Ishikawa S, Yumoto Y, Moriguchi M, Niwano H, Kosukegawa T, Izumi T. Importance of Morphological Changes in T-U Waves During Bepridil Therapy as a Predictor of Ventricular Arrhythmic Event. Circ J 2010; 74:876-84. [DOI: 10.1253/circj.cj-09-0937] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sayaka Kurokawa
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Shinichi Niwano
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Michiro Kiryu
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Masami Murakami
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Shoko Ishikawa
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Yoshihiro Yumoto
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | | | - Hiroe Niwano
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Tomoko Kosukegawa
- Department of Cardio-Angiology, Kitasato University School of Medicine
| | - Tohru Izumi
- Department of Cardio-Angiology, Kitasato University School of Medicine
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Li GR, Dong MQ. Pharmacology of Cardiac Potassium Channels. CARDIOVASCULAR PHARMACOLOGY - HEART AND CIRCULATION 2010; 59:93-134. [DOI: 10.1016/s1054-3589(10)59004-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Niwano S, Sasaki T, Kurokawa S, Kiryu M, Fukaya H, Hatakeyama Y, Niwano H, Fujiki A, Izumi T. Predicting the efficacy of antiarrhythmic agents for interrupting persistent atrial fibrillation according to spectral analysis of the fibrillation waves on the surface ECG. Circ J 2009; 73:1210-8. [PMID: 19436116 DOI: 10.1253/circj.cj-08-1139] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Spectral analysis of the fibrillation waves was performed in patients with persistent atrial fibrillation (PAF) to clarify the usefulness of this method of predicting the efficacy of antiarrhythmic agents. METHODS AND RESULTS The 59 patients with PAF were randomly assigned to pilsicainide (150 mg/day) or bepridil (200 mg/day) therapy for 4 weeks under optimal anticoagulation therapy. When the first therapy did not interrupt PAF, the drugs were changed in a cross-over manner. The fibrillation cycle length (FCL) was calculated using spectral analysis of the fibrillation waves on the body-surface ECG every 2 weeks. Pilsicainide and bepridil were effective in 19 and 20 patients, respectively. The FCL at the basic state was longest in the pilsicainide-effective group, moderate in the bepridil-effective group and shortest in the failure group (P<0.05). The change in FCL with drug administration (DeltaFCL) was larger in the effective than in the ineffective cases (P<0.01). Successful interruption of the atrial fibrillation (AF) with pilsicainide could be expected for patients with a FCL >148 ms (sensitivity =0.917, specificity =0.612, P=0.007) and DeltaFCL >41 ms (sensitivity =0.875, specificity =0.833, P=0.001). CONCLUSIONS The FCL reflects the electrophysiological properties of the AF substrate and is considered useful for predicting the efficacy of antiarrhythmic agents.
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Affiliation(s)
- Shinichi Niwano
- Department of Cardio-Angiology, Kitasato University School of Medicine, Kitasato, Sagamihara, Japan.
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Osaka T, Yokoyama E, Kushiyama Y, Hasebe H, Kuroda Y, Suzuki T, Kodama I. Opposing Effects of Bepridil on Ventricular Repolarization in Humans Inhomogeneous Prolongation of the Action Potential Duration vs Flattening of Its Restitution Kinetics. Circ J 2009; 73:1612-8. [DOI: 10.1253/circj.cj-09-0139] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Toshiyuki Osaka
- Division of Arrhythmia and Electrophysiology, Shizuoka Saiseikai General Hospital
| | - Eriko Yokoyama
- Division of Arrhythmia and Electrophysiology, Shizuoka Saiseikai General Hospital
| | - Yasunori Kushiyama
- Division of Arrhythmia and Electrophysiology, Shizuoka Saiseikai General Hospital
| | - Hideyuki Hasebe
- Division of Arrhythmia and Electrophysiology, Shizuoka Saiseikai General Hospital
| | - Yusuke Kuroda
- Division of Arrhythmia and Electrophysiology, Shizuoka Saiseikai General Hospital
| | - Tomoyuki Suzuki
- Division of Arrhythmia and Electrophysiology, Shizuoka Saiseikai General Hospital
| | - Itsuo Kodama
- Department of Cardiovasucular Research, Research Institute of Environmental Medicine, Nagoya University
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Zankov DP, Ding WG, Matsuura H, Horie M. Open-State Unblock Characterizes Acute Inhibition of IKs Potassium Current by Amiodarone in Guinea Pig Ventricular Myocytes. J Cardiovasc Electrophysiol 2005; 16:314-22. [PMID: 15817093 DOI: 10.1046/j.1540-8167.2005.40561.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
INTRODUCTION The aim of the present study was to investigate the acute action of amiodarone on the slow component of delayed rectifier K+ current (IKs) under basal conditions and during beta-adrenoceptor stimulation in guinea pig ventricular myocytes. METHODS AND RESULTS Using the whole-cell patch-clamp method, IKs was evoked by depolarizing voltage-clamp steps, during superfusion with the Na+-, K+-, and Ca2+-free solution supplemented with 0.4 microM nisoldipine and 5 microM E-4031. The acute effect of amiodarone was evaluated, within approximately 10 minutes after starting the bath application, by the amplitude of deactivating tail currents at -50 mV. Amiodarone concentration dependently blocked I(Ks) and exerted a more potent effect on IKs when activated by shorter pulse durations; the degree of block by 30 microM amiodarone on IKs activated by 200 ms, 500 ms, and 2000 ms depolarizing pulses to +30 mV was 55.9 +/- 5.8%, 38.6 +/- 6.0%, and 27.1 +/- 4.0% (n = 5 each), respectively. An envelope of tails test conducted at +10, +30, and +60 mV demonstrated that the degree of IKs block by amiodarone was gradually attenuated during membrane depolarization, which can be described by a monoexponential function, thus supporting the presence of open channel unblock. Amiodarone also blocked IKs maximally stimulated by 1 microM isoprenaline, to an extent similar to control, when IKs was activated by pulse durations of < or =2000 ms. CONCLUSION We propose that amiodarone acutely blocks native IKs with characteristics associated with open channel unblock, and that the protein kinase A-mediated phosphorylation of channel proteins only minimally affects the amiodarone block.
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Affiliation(s)
- Dimitar P Zankov
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan
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