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Filatova TS, Kuzmin VS, Dzhumaniiazova I, Pustovit OB, Abramochkin DV, Shiels HA. 3-Methyl-phenanthrene (3-MP) disrupts the electrical and contractile activity of the heart of the polar fish, navaga cod (Eleginus nawaga). Chemosphere 2024; 357:142089. [PMID: 38643846 DOI: 10.1016/j.chemosphere.2024.142089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2024] [Revised: 04/17/2024] [Accepted: 04/18/2024] [Indexed: 04/23/2024]
Abstract
Alkylated polycyclic aromatic hydrocarbons are abundant in crude oil and are enriched during petroleum refinement but knowledge of their cardiotoxicity remains limited. Polycyclic aromatic hydrocarbons (PAHs) are considered the main hazardous components in crude oil and the tricyclic PAH phenanthrene has been singled out for its direct effects on cardiac tissue in mammals and fish. Here we test the impact of the monomethylated phenanthrene, 3-methylphenanthrene (3-MP), on the contractile and electrical function of the atrium and ventricle of a polar fish, the navaga cod (Eleginus nawaga). Using patch-clamp electrophysiology in atrial and ventricular cardiomyocytes we show that 3-MP is a potent inhibitor of the delayed rectifier current IKr (IC50 = 0.25 μM) and prolongs ventricular action potential duration. Unlike the parent compound phenanthrene, 3-MP did not reduce the amplitude of the L-type Ca2+ current (ICa) but it accelerated current inactivation thus reducing charge transfer across the myocyte membrane and compromising pressure development of the whole heart. 3-MP was a potent inhibitor (IC50 = 4.7 μM) of the sodium current (INa), slowing the upstroke of the action potential in isolated cells, slowing conduction velocity across the atrium measured with optical mapping, and increasing atrio-ventricular delay in a working whole heart preparation. Together, these findings reveal the strong cardiotoxic potential of this phenanthrene derivative on the fish heart. As 3-MP and other alkylated phenanthrenes comprise a large fraction of the PAHs in crude oil mixtures, these findings are worrisome for Arctic species facing increasing incidence of spills and leaks from the petroleum industry. 3-MP is also a major component of polluted air but is not routinely measured. This is also of concern if the hearts of humans and other terrestrial animals respond to this PAH in a similar manner to fish.
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Affiliation(s)
- Tatiana S Filatova
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Vladislav S Kuzmin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Irina Dzhumaniiazova
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Oksana B Pustovit
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Denis V Abramochkin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia; Laboratory of Cardiac Electrophysiology, Chazov National Medical Research Center for Cardiology, Moscow, Russia; Department of Physiology, Pirogov Russian National Research Medical University, Ostrovityanova str., 1, Moscow, Russia
| | - Holly A Shiels
- Faculty of Biology, Medicine and Health, Core Technology Facility, 46 Grafton Street, University of Manchester, Manchester, M13 9NT, UK.
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Golyako IA, Kuzmin VS, Gorbacheva LR. The effect of hyperglycemia on the activation of peritoneal macrophages of albino rats. Biomed Khim 2023; 69:394-402. [PMID: 38153054 DOI: 10.18097/pbmc20236906394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
Hyperglycemia is one of the main damaging factors of diabetes mellitus (DM). The severity of this disease is most clearly manifested under conditions of the inflammatory process. In this work, we have studied the activation features of rat peritoneal macrophages (MPs) under conditions of high glucose concentration in vitro. Comparison of the independent and combined effects of streptozotocin-induced DM and hyperglycemia on proliferation and accumulation of nitrites in the MPs culture medium revealed similarity of their effects. Elevated glucose levels and, to a lesser extent, DM decreased basal proliferation and NO production by MPs in vitro. The use of the protein kinase C (PKC) activator, phorbol ester (PMA), abolished the proinflammatory effect of thrombin on PMs. This suggests the involvement of PKC in the effects of the protease. At the same time, the effect of thrombin on the level of nitrites in the culture medium demonstrates a pronounced dose-dependence, which was not recognized during evaluation of proliferation. Proinflammatory activation of MPs is potentiated by hyperglycemia, one of the main pathological factors of diabetes. Despite the fact that high concentrations of glucose have a significant effect on proliferation and NO production, no statistically significant differences were found between the responses of MPs obtained from healthy animals and from animals with streptozotocin-induced DM. This ratio was observed for all parameters studied in the work, during analysis of cell proliferation and measurement of nitrites in the culture medium. Thus, the results obtained indicate the leading role of elevated glucose levels in the regulation of MPs activation, which is comparable to the effect of DM and even "masks" it.
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Affiliation(s)
| | - V S Kuzmin
- Academician E.I. Chazov National Medical Research Center for Cardiology, Moscow, Russia
| | - L R Gorbacheva
- Moscow State University, Moscow, Russia; Pirogov Russian National Research Medical University, Moscow, Russia
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Abramochkin DV, Filatova TS, Kuzmin VS, Voronkov YI, Kamkin A, Shiels HA. Tricyclic hydrocarbon fluorene attenuates ventricular ionic currents and pressure development in the navaga cod. Comp Biochem Physiol C Toxicol Pharmacol 2023; 273:109736. [PMID: 37659611 DOI: 10.1016/j.cbpc.2023.109736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 08/22/2023] [Accepted: 08/30/2023] [Indexed: 09/04/2023]
Abstract
The release of polycyclic aromatic hydrocarbons (PAHs) into the environment due to oil and diesel fuel spills is a serious threat to Arctic fish populations. PAHs produce multiple toxic effects in fish, but disturbance of electrical and contractile activity of the heart seems to be the most negative effect. Our study focused on the effects of fluorene, a tricyclic PAH resembling the well-investigated tricyclic phenanthrene, on major ionic currents and action potential (AP) waveform in isolated ventricular myocytes and on contractile activity in isolated whole hearts of polar navaga cod (Eleginus nawaga). Among the studied currents, the repolarizing rapid delayed rectifier K+ current IKr demonstrated the highest sensitivity to fluorene with IC50 of 0.54 μM. The depolarizing inward currents, INa and ICaL, were inhibited with 10 μM fluorene by 20.2 ± 2.8 % and 27.9 ± 8.4 %, respectively, thereby being much less sensitive to fluorene than IKr. Inward rectifier IK1 current was insensitive to fluorene (up to 10 μM). While 3 μM fluorene prolonged APs, 10 μM also slowed the AP upstroke. Resting membrane potential was not affected by any tested concentrations. In isolated heart experiments 10 μM fluorene caused modest depression of ventricular contractile activity. Thus, we have demonstrated that fluorene, a tricyclic PAH present in high quantities in crude oil, strongly impacts electrical activity with only slight effects on contractile activity in the heart of the polar fish, the navaga cod.
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Affiliation(s)
- Denis V Abramochkin
- Department of Biology, MSU-BIT University, Shenzhen, Guangdong Province, China; Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia.
| | - Tatiana S Filatova
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Vladislav S Kuzmin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia; Laboratory of Cardiac Electrophysiology, Chazov National Medical Research Center for Cardiology, Moscow, Russia
| | - Yuri I Voronkov
- State Research Center of the Russian Federation, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Andre Kamkin
- Department of Physiology, Pirogov Russian National Research Medical University, Ostrovityanova str., 1, Moscow, Russia
| | - Holly A Shiels
- Faculty of Biology, Medicine and Health, Core Technology Facility, 46 Grafton Street, University of Manchester, Manchester M13 9NT, UK
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Filatova TS, Kuzmin VS, Guskova VO, Abramochkin DV. Sodium current preserves electrical excitability in the heart of hibernating ground squirrel (Citellus undulatus). Comp Biochem Physiol A Mol Integr Physiol 2023; 282:111452. [PMID: 37207928 DOI: 10.1016/j.cbpa.2023.111452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 05/16/2023] [Accepted: 05/16/2023] [Indexed: 05/21/2023]
Abstract
Hibernating mammals are capable of maintaining normal cardiac function at low temperatures. Excitability of cardiac myocytes crucially depends on the fast sodium current (INa), which is decreased in hypothermia due to both depolarization of resting membrane potential and direct negative effect of low temperature. Therefore, INa in hibernating mammals should have specific features allowing to maintain excitability of myocardium at low temperatures. The current-voltage dependence of INa, its steady-state inactivation and activation and recovery from inactivation were studied in winter hibernating (WH) and summer active (SA) ground squirrels and in rats using whole-cell patch clamp at 10 °C and 20 °C. INa peak amplitude and the parameters of steady-state activation and inactivation curves did not differ between SA and WH ground squirrels at both temperatures. However, at both temperatures strong positive shift of activation and inactivation curves by 5-12 mV was observed in both WH and SA ground squirrels if compared to rats. This peculiarity of cardiac INa in ground squirrels helps to maintain excitability in conditions of depolarized resting membrane potential. The time course of INa recovery from inactivation at 10 °C was faster in WH than in SA ground squirrels, which could ensure normal activation of myocardium during hibernation.
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Affiliation(s)
- Tatiana S Filatova
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow 119234, Russia
| | - Vladislav S Kuzmin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow 119234, Russia; Laboratory of Cardiac Electrophysiology, Chazov National Medical Research Center for Cardiology, Moscow, Russia
| | - Viktoria O Guskova
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow 119234, Russia
| | - Denis V Abramochkin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow 119234, Russia.
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Abramochkin DV, Pustovit OB, Mironov NY, Filatova TS, Kuzmin VS. The Dependence of the Electrophysiological Effects of Class III Antiarrhythmic Drug Refralon on the Frequency of Myocardium Activation. Bull Exp Biol Med 2023; 174:610-615. [PMID: 37040036 DOI: 10.1007/s10517-023-05756-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Indexed: 04/12/2023]
Abstract
We studied the frequency dependence of the effects of the novel Russian class III antiarrhythmic drug refralon on the duration of action potentials (AP) in rabbit ventricular myocardium. The absence of an inverse frequency dependence of AP prolongation was demonstrated: the effects of refralon at stimulation frequency of 1 Hz were stronger than at 0.1 Hz. The patch-clamp experiments with recording of rapid delayed rectifier potassium current IKr in a heterologous expression system showed that the blocking effect of refralon developed significantly faster at 2 Hz depolarization frequency than at 0.2 Hz. This feature of refralon distinguishes it among the majority of other class III drugs (sotalol, dofetilide, E-4031) and explains the relatively high safety of this drug together with its high efficacy.
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Affiliation(s)
- D V Abramochkin
- Department of Human and Animal Physiology, M. V. Lomonosov Moscow State University, Moscow, Russia.
- E. I. Chazov National Medical Research Center of Cardiology, Ministry of Health of the Russian Federation, Moscow, Russia.
- Scientific Research Laboratory of Electrophysiology, Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia.
| | - O B Pustovit
- Department of Human and Animal Physiology, M. V. Lomonosov Moscow State University, Moscow, Russia
| | - N Yu Mironov
- E. I. Chazov National Medical Research Center of Cardiology, Ministry of Health of the Russian Federation, Moscow, Russia
| | - T S Filatova
- Department of Human and Animal Physiology, M. V. Lomonosov Moscow State University, Moscow, Russia
| | - V S Kuzmin
- Department of Human and Animal Physiology, M. V. Lomonosov Moscow State University, Moscow, Russia
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Durkina AV, Bernikova OG, Gonotkov MA, Mikhaleva NJ, Sedova KA, Malykhina IA, Kuzmin VS, Velegzhaninov IO, Azarov JE. Melatonin treatment improves ventricular conduction via upregulation of Nav1.5 channel proteins and sodium current in the normal rat heart. J Pineal Res 2022; 73:e12798. [PMID: 35384053 DOI: 10.1111/jpi.12798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 03/31/2022] [Accepted: 04/02/2022] [Indexed: 11/29/2022]
Abstract
Melatonin treatment was reported to reduce the risk of cardiac arrhythmias, and crucial for this antiarrhythmic action was the effect of melatonin on activation spread. The aim of the present study was evaluation of the mechanisms of this activation enhancement. Experiments were performed in a total of 123 control and melatonin-treated (10 mg/kg, daily, for 7 days) male Wistar rats. In epicardial mapping studies (64 leads, interlead distance 0.5 mm) in the anesthetized animals, activation times (ATs) were determined in each lead as dV/dt minimum during QRS complex under sinus rhythm. Epicardial pacing was performed to measure conduction velocity (CV) across the mapped area. Average left ventricular ATs were shorter in the treated animals as compared to the controls, whereas the minimal epicardial ATs indicating the duration of activation propagation via the ventricular conduction system did not differ between the groups. CV was higher in the treated groups indicating that melatonin affected conduction via contractile myocardium The area of Cx43-derived fluorescence, as well as the expression of Cx43 protein, was similar in ventricles in the control and melatonin-treated groups. Expression of Gja1 gene transcripts encoding Cx43, was increased in the last group. An uncoupling agent octanol modified myocardial conduction properties (time of activation, action potential upstroke velocity, passive electrotonic phase duration) similarly in both groups. On the other hand, the expression of both Scn5a gene transcripts encoding Nav1.5 proteins, as well as peak density of transmembrane sodium current were increased in the ventricular myocytes from the melatonin-treated animals. Thus, a week-long melatonin treatment caused the increase of conduction velocity via enhancement of sodium channel proteins expression and increase of sodium current in the ventricular myocytes.
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Affiliation(s)
- Aleksandra V Durkina
- Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - Olesya G Bernikova
- Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - Mikhail A Gonotkov
- Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - Natalia J Mikhaleva
- Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - Ksenia A Sedova
- Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, Kladno, Czech Republic
| | - Inna A Malykhina
- Department of Human and Animal Physiology, Biological Faculty, Lomonosov Moscow State University, Moscow, Russia
| | - Vladislav S Kuzmin
- Department of Human and Animal Physiology, Biological Faculty, Lomonosov Moscow State University, Moscow, Russia
| | - Ilya O Velegzhaninov
- Department of Radioecology, Institute of Biology, Komi Scientific Centre, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - Jan E Azarov
- Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
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Pustovit KB, Samoilova DV, Abramochkin DV, Filatova TS, Kuzmin VS. α1-adrenergic receptors accompanied by GATA4 expression are related to proarrhythmic conduction and automaticity in rat interatrial septum. J Physiol Biochem 2022; 78:793-805. [PMID: 35802254 DOI: 10.1007/s13105-022-00902-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 05/19/2022] [Indexed: 11/25/2022]
Abstract
The development of interatrial septum (IAS) is a complicated process, which continues during postnatal life. The hypertrophic signals in developing heart are mediated among others by α-adrenergic pathways. These facts suggest the presence of specific electrophysiological features in developing IAS. This study was aimed to investigate the electrical activity in the tissue preparations of IAS from rat heart in normal conditions and under stimulation of adrenoreceptors. Intracellular recording of electrical activity revealed less negative level of resting membrane potential in IAS if compared to myocardium of left atrium. In normal conditions, non-paced IAS preparations were quiescent, but noradrenaline (10-5 M) and phenylephrine (10-5 M) induced spontaneous action potentials, which could be abolished by α1-blocker prazosin (10-5 M), but not β1-blocker atenolol (10-5 M). Optical mapping showed drastic phenylephrine-induced slowing of conduction in adult rat IAS. The α1-dependent ectopic automaticity of IAS myocardium might be explained by immunohistochemical data indicating the presence of transcription factor GATA4 and abundant α1A-adrenoreceptors in myocytes from adult rat IAS. An elevated sensitivity to adrenergic stimulation due to involvement of α1-adrenergic pathways may underlie increased proarrhythmic potential of adult IAS at least in rats.
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Affiliation(s)
- Ksenia B Pustovit
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Daria V Samoilova
- N. N. Blokhin National Medical Research Centre of Oncology, Kashirskoye sh., 24, Moscow, Russia
| | - Denis V Abramochkin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia.
| | - Tatiana S Filatova
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia.,Laboratory of Cardiac Electrophysiology, National Medical Research Center for Cardiology, 3rd Cherepkovskaya, 15a, Moscow, Russia.,Department of Physiology, Pirogov Russian National Research Medical University, Ostrovityanova str., 1, Moscow, Russia
| | - Vladislav S Kuzmin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
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Abramochkin DV, Filatova TS, Pustovit KB, Voronina YA, Kuzmin VS, Vornanen M. Ionic currents underlying different patterns of electrical activity in working cardiac myocytes of mammals and non-mammalian vertebrates. Comp Biochem Physiol A Mol Integr Physiol 2022; 268:111204. [PMID: 35346823 DOI: 10.1016/j.cbpa.2022.111204] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 03/21/2022] [Accepted: 03/22/2022] [Indexed: 12/19/2022]
Abstract
The orderly contraction of the vertebrate heart is determined by generation and propagation of cardiac action potentials (APs). APs are generated by the integrated activity of time- and voltage-dependent ionic channels which carry inward Na+ and Ca2+ currents, and outward K+ currents. This review compares atrial and ventricular APs and underlying ion currents between different taxa of vertebrates. We have collected literature data and attempted to find common electrophysiological features for two or more vertebrate groups, show differences between taxa and cardiac chambers, and indicate gaps in the existing data. Although electrical excitability of the heart in all vertebrates is based on the same superfamily of channels, there is a vast variability of AP waveforms between atrial and ventricular myocytes, between different species of the same vertebrate class and between endothermic and ectothermic animals. The wide variability of AP shapes is related to species-specific differences in animal size, heart rate, stage of ontogenetic development, excitation-contraction coupling, temperature and oxygen availability. Some of the differences between taxa are related to evolutionary development of genomes, which appear e.g. in the expression of different Na+ and K+ channel orthologues in cardiomyocytes of vertebrates. There is a wonderful variability of AP shapes and underlying ion currents with which electrical excitability of vertebrate heart can be generated depending on the intrinsic and extrinsic conditions of animal body. This multitude of ionic mechanisms provides excellent material for studying how the function of the vertebrate heart can adapt or acclimate to prevailing physiological and environmental conditions.
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Affiliation(s)
- Denis V Abramochkin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye gory, 1, 12, Moscow 119234, Russia.
| | - Tatiana S Filatova
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye gory, 1, 12, Moscow 119234, Russia
| | - Ksenia B Pustovit
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye gory, 1, 12, Moscow 119234, Russia
| | - Yana A Voronina
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye gory, 1, 12, Moscow 119234, Russia; Laboratory of Cardiac Electrophysiology, National Medical Research Center for Cardiology, 3(rd) Cherepkovskaya str., 15A, Moscow, Russia
| | - Vladislav S Kuzmin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye gory, 1, 12, Moscow 119234, Russia; Department of Physiology, Pirogov Russian National Research Medical University, Ostrovityanova str., 1, Moscow, Russia
| | - Matti Vornanen
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
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Abramochkin DV, Haworth TE, Kuzmin VS, Dzhumaniiazova I, Pustovit KB, Gacoin M, Shiels HA. Adrenergic prolongation of action potential duration in rainbow trout myocardium via inhibition of the delayed rectifier potassium current, I Kr. Comp Biochem Physiol A Mol Integr Physiol 2022; 267:111161. [PMID: 35143950 DOI: 10.1016/j.cbpa.2022.111161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 02/03/2022] [Accepted: 02/04/2022] [Indexed: 11/19/2022]
Abstract
Catecholamines mediate the 'fight or flight' response in a wide variety of vertebrates. The endogenous catecholamine adrenaline increases heart rate and contractile strength to raise cardiac output. The increase in contractile force is driven in large part by an increase in myocyte Ca2+ influx on the L-type Ca current (ICaL) during the cardiac action potential (AP). Here, we report a K+- based mechanism that prolongs AP duration (APD) in fish hearts following adrenergic stimulation. We show that adrenergic stimulation inhibits the delayed rectifier K+ current (IKr) in rainbow trout (Oncorhynchus mykiss) cardiomyocytes. This slows repolarization and prolongs APD which may contribute to positive inotropy following adrenergic stimulation in fish hearts. The endogenous ligand, adrenaline (1 μM), which activates both α- and β-ARs reduced maximal IKr tail current to 61.4 ± 3.9% of control in atrial and ventricular myocytes resulting in an APD prolongation of ~20% at both 50 and 90% repolarization. This effect was reproduced by the α-specific adrenergic agonist, phenylephrine (1 μM), but not the β-specific adrenergic agonist isoproterenol (1 μM). Adrenaline (1 μM) in the presence of β1 and β2-blockers (1 μM atenolol and 1 μM ICI-118551, respectively) also inhibited IKr. Thus, IKr suppression following α-adrenergic stimulation leads to APD prolongation in the rainbow trout heart. This is the first time this mechanism has been identified in fish and may act in unison with the well-known enhancement of ICaL following adrenergic stimulation to prolong APD and increase cardiac inotropy.
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Affiliation(s)
- Denis V Abramochkin
- Department of human and animal physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - T Eliot Haworth
- Faculty of Biological, Medical and Human Sciences, University of Manchester, Manchester M13 9NT, UK
| | - Vladislav S Kuzmin
- Department of human and animal physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Irina Dzhumaniiazova
- Department of human and animal physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Ksenia B Pustovit
- Department of human and animal physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Maeva Gacoin
- Faculty of Biological, Medical and Human Sciences, University of Manchester, Manchester M13 9NT, UK; Institut des Sciences Cognitives Marc Jeannerod, UMR5229 CNRS, Université de Lyon, 67 Boulevard Pinel, 69675 Bron Cedex, France
| | - Holly A Shiels
- Faculty of Biological, Medical and Human Sciences, University of Manchester, Manchester M13 9NT, UK.
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Selivanova EK, Shvetsova AA, Borzykh AA, Gaynullina DK, Kiryukhina OO, Lukoshkova EV, Potekhina VM, Kuzmin VS, Tarasova OS. Intrauterine L-NAME Exposure Weakens the Development of Sympathetic Innervation and Induces the Remodeling of Arterial Vessels in Two-Week-Old Rats. Int J Mol Sci 2021; 22:ijms222212327. [PMID: 34830206 PMCID: PMC8618620 DOI: 10.3390/ijms222212327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 11/10/2021] [Accepted: 11/13/2021] [Indexed: 11/19/2022] Open
Abstract
Nitric oxide (NO) has been shown to stimulate differentiation and increase the survival of ganglionic sympathetic neurons. The proportion of neuronal NOS-immunoreactive sympathetic preganglionic neurons is particularly high in newborn rats and decreases with maturation. However, the role of NO in the development of vascular sympathetic innervation has never been studied before. We tested the hypothesis that intrauterine NO deficiency weakened the development of vascular sympathetic innervation and thereby changed the contractility of peripheral arteries and blood pressure level in two-week-old offspring. Pregnant rats consumed NOS inhibitor L-NAME (250 mg/L in drinking water) from gestational day 10 until delivery. Pups in the L-NAME group had a reduced body weight and blood level of NO metabolites at 1–2 postnatal days. Saphenous arteries from two-week-old L-NAME offspring demonstrated a lower density of sympathetic innervation, a smaller inner diameter, reduced maximal active force and decreased α-actin/β-actin mRNA expression ratio compared to the controls. Importantly, pups in the L-NAME group exhibited decreased blood pressure levels before, but not after, ganglionic blockade with chlorisondamine. In conclusion, intrauterine L-NAME exposure is followed by the impaired development of the sympathetic nervous system in early postnatal life, which is accompanied by the structural and functional remodeling of arterial blood vessels.
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Affiliation(s)
- Ekaterina K. Selivanova
- Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, 119234 Moscow, Russia; (E.K.S.); (A.A.S.); (D.K.G.); (V.M.P.); (V.S.K.)
| | - Anastasia A. Shvetsova
- Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, 119234 Moscow, Russia; (E.K.S.); (A.A.S.); (D.K.G.); (V.M.P.); (V.S.K.)
| | - Anna A. Borzykh
- Laboratory of Exercise Physiology, State Research Center of the Russian Federation, Institute for Biomedical Problems, Russian Academy of Sciences, 123007 Moscow, Russia;
| | - Dina K. Gaynullina
- Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, 119234 Moscow, Russia; (E.K.S.); (A.A.S.); (D.K.G.); (V.M.P.); (V.S.K.)
| | - Oxana O. Kiryukhina
- Laboratory for the Study of Information Processes at the Cellular and Molecular Levels, Institute for Information Transmission Problems, Russian Academy of Sciences, 119333 Moscow, Russia;
| | - Elena V. Lukoshkova
- Laboratory of Experimental Pathology of the Heart, National Medical Research Center of Cardiology, Ministry of Health of the Russian Federation, 121552 Moscow, Russia;
| | - Viktoria M. Potekhina
- Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, 119234 Moscow, Russia; (E.K.S.); (A.A.S.); (D.K.G.); (V.M.P.); (V.S.K.)
| | - Vladislav S. Kuzmin
- Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, 119234 Moscow, Russia; (E.K.S.); (A.A.S.); (D.K.G.); (V.M.P.); (V.S.K.)
| | - Olga S. Tarasova
- Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, 119234 Moscow, Russia; (E.K.S.); (A.A.S.); (D.K.G.); (V.M.P.); (V.S.K.)
- Laboratory of Exercise Physiology, State Research Center of the Russian Federation, Institute for Biomedical Problems, Russian Academy of Sciences, 123007 Moscow, Russia;
- Correspondence:
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11
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Aminu AJ, Petkova M, Atkinson AJ, Yanni J, Morris AD, Simms RT, Chen W, Yin Z, Kuniewicz M, Holda MK, Kuzmin VS, Perde F, Molenaar P, Dobrzynski H. Further insights into the molecular complexity of the human sinus node - The role of 'novel' transcription factors and microRNAs. Prog Biophys Mol Biol 2021; 166:86-104. [PMID: 34004232 DOI: 10.1016/j.pbiomolbio.2021.04.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 04/26/2021] [Accepted: 04/29/2021] [Indexed: 02/06/2023]
Abstract
RESEARCH PURPOSE The sinus node (SN) is the heart's primary pacemaker. Key ion channels (mainly the funny channel, HCN4) and Ca2+-handling proteins in the SN are responsible for its function. Transcription factors (TFs) regulate gene expression through inhibition or activation and microRNAs (miRs) do this through inhibition. There is high expression of macrophages and mast cells within the SN connective tissue. 'Novel'/unexplored TFs and miRs in the regulation of ion channels and immune cells in the SN are not well understood. Using RNAseq and bioinformatics, the expression profile and predicted interaction of key TFs and cell markers with key miRs in the adult human SN vs. right atrial tissue (RA) were determined. PRINCIPAL RESULTS 68 and 60 TFs significantly more or less expressed in the SN vs. RA respectively. Among those more expressed were ISL1 and TBX3 (involved in embryonic development of the SN) and 'novel' RUNX1-2, CEBPA, GLI1-2 and SOX2. These TFs were predicted to regulate HCN4 expression in the SN. Markers for different cells: fibroblasts (COL1A1), fat (FABP4), macrophages (CSF1R and CD209), natural killer (GZMA) and mast (TPSAB1) were significantly more expressed in the SN vs. RA. Interestingly, RUNX1-3, CEBPA and GLI1 also regulate expression of these cells. MiR-486-3p inhibits HCN4 and markers involved in immune response. MAJOR CONCLUSIONS In conclusion, RUNX1-2, CSF1R, TPSAB1, COL1A1 and HCN4 are highly expressed in the SN but not miR-486-3p. Their complex interactions can be used to treat SN dysfunction such as bradycardia. Interestingly, another research group recently reported miR-486-3p is upregulated in blood samples from severe COVID-19 patients who suffer from bradycardia.
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Affiliation(s)
- Abimbola J Aminu
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom
| | - Maria Petkova
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom
| | - Andrew J Atkinson
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom
| | - Joseph Yanni
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom
| | - Alex D Morris
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom
| | - Robert T Simms
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom
| | - Weixuan Chen
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom
| | - Zeyuan Yin
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom
| | - Marcin Kuniewicz
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom; Department of Anatomy, Jagiellonian University Medical College, Krakow, Poland
| | - Mateusz K Holda
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom; Department of Anatomy, Jagiellonian University Medical College, Krakow, Poland
| | - Vladislav S Kuzmin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Moscow, Russia
| | - Filip Perde
- National Institute of Legal Medicine, Bucharest, Romania
| | - Peter Molenaar
- School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia; Cardiovascular Molecular & Therapeutics Translational Research Group, University of Queensland, The Prince Charles Hospital, Brisbane, Australia
| | - Halina Dobrzynski
- The Division of Cardiovascular Sciences, University of Manchester, United Kingdom; Department of Anatomy, Jagiellonian University Medical College, Krakow, Poland.
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12
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Abramochkin DV, Kuzmin VS, Matchkov V, Kamensky AA, Wang T. The snake heart pacemaker is localized near the sinoatrial valve. J Exp Biol 2021; 224:271070. [PMID: 34318309 DOI: 10.1242/jeb.242778] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 07/23/2021] [Indexed: 11/20/2022]
Abstract
To provide the first description of the exact location of primary pacemaker of the squamate heart, we used sharp microelectrode impalements and optical mapping of isolated sinus venosus preparations from Burmese pythons. We located the dominant pacemaker site at the base of the right leaflet of the sinoatrial valve (SAV), but latent pacemakers were also identified in a circular region around the SAV. Acetylcholine (10-5 mol l-1) or noradrenaline (10-6 mol l-1) induced shifts of the leading pacemaker site to other points near the SAV. The ionic currents of most of the cardiomyocytes isolated enzymatically from the SAV region resembled those of typical working myocytes from the sinus venosus. However, seven cells lacked the background inward rectifier current (IK1) and had a time-dependent hyperpolarization-induced inward current identified as the 'funny' pacemaker current (If). Therefore, the region proximal to SAV demonstrates pacemaking activity and contains cells that resemble the electrophysiological properties of mammalian pacemaker myocytes.
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Affiliation(s)
- Denis V Abramochkin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, 119234 Moscow, Russia.,Laboratory of Cardiac Electrophysiology, National Medical Research Center for Cardiology, 3rd Cherepkovskaya, 15a, 121552 Moscow, Russia.,Department of Physiology, Pirogov Russian National Research Medical University, Ostrovityanova, 1a, 117997 Moscow, Russia
| | - Vladislav S Kuzmin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, 119234 Moscow, Russia.,Laboratory of Cardiac Electrophysiology, National Medical Research Center for Cardiology, 3rd Cherepkovskaya, 15a, 121552 Moscow, Russia.,Department of Physiology, Pirogov Russian National Research Medical University, Ostrovityanova, 1a, 117997 Moscow, Russia
| | - Vladimir Matchkov
- MEMBRANES, Department of Biomedicine, Faculty of Health, University of Aarhus, 8000 Aarhus, Denmark
| | - Andrey A Kamensky
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, 119234 Moscow, Russia
| | - Tobias Wang
- Section of Zoophysiology, Institute of Biology, University of Aarhus, 8000C Aarhus, Denmark
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13
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Kuzmin VS, Ivanova AD, Filatova TS, Pustovit KB, Kobylina AA, Atkinson AJ, Petkova M, Voronkov YI, Abramochkin DV, Dobrzynski H. Micro-RNA 133a-3p induces repolarization abnormalities in atrial myocardium and modulates ventricular electrophysiology affecting I Ca,L and Ito currents. Eur J Pharmacol 2021; 908:174369. [PMID: 34310913 DOI: 10.1016/j.ejphar.2021.174369] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 07/16/2021] [Accepted: 07/21/2021] [Indexed: 01/04/2023]
Abstract
Mir-133a-3p is the most abundant myocardial microRNA. The impact of mir-133a-3p on cardiac electrophysiology is poorly explored. In this study, we investigated the effects of mir-133a-3p on the main ionic currents critical for action potential (AP) generation and electrical activity of the heart. We used conventional ECG, sharp microelectrodes and patch-clamp to clarify a role of mir-133a-3p in normal cardiac electrophysiology in rats after in vivo and in vitro transfection. Mir-133a-3p caused no changes to pacemaker APs and automaticity in the sinoatrial node. No significant changes in heart rate (HR) were observed in vivo; however, miR transfection facilitated HR increase in response to β-adrenergic stimulation. Mir-133a-3p induced repolarization abnormalities in the atrial working myocardium and the L-type calcium current (ICa,L) was significantly increased. The main repolarization currents, including the transient outward (Ito), ultra-rapid (IK,ur), and inward rectifier (IK1) remained unaffected in atrial cardiomyocytes. Mir-133a-3p affected both ICa,L and Ito in ventricular cardiomyocytes. Systemic administration of mir-133a-3p induced QT-interval prolongation. Bioinformatic analysis revealed protein phosphatase 2 (PPP2CA/B) and Kcnd3 (encoding Kv4.3 channels generating Ito) as the main miR-133a-3p targets in the heart. No changes in mRNA expression of Cacna1c (encoding Cav1.2 channels generating ICa,L) and Kcnd3 were seen in mir-133a-3p treated rats. However, the expression of Ppp2cA, encoding PPP2CA, and Kcnip2 encoding KChIP2, a Kv4.3 regulatory protein, were significantly decreased. The accumulation of mir-133a-3p in cardiac myocytes causes chamber-specific electrophysiological changes. The suppression of PPP2CA, involved in adrenergic signal transduction, and Kchip2 may indirectly mediate mir-133a-3p-induced augmentation of ICa,L and attenuation of Ito.
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Affiliation(s)
- Vladislav S Kuzmin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia; Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russia; Laboratory of Cardiac Electrophysiology, National Medical Research Cardiological Complex (NMRCC), Institute of Experimental Cardiology, Moscow, Russia.
| | - Alexandra D Ivanova
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Tatiana S Filatova
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia; Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russia; Laboratory of Cardiac Electrophysiology, National Medical Research Cardiological Complex (NMRCC), Institute of Experimental Cardiology, Moscow, Russia
| | - Ksenia B Pustovit
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Anastasia A Kobylina
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia
| | - Andrew J Atkinson
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Maria Petkova
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Yurij I Voronkov
- State Research Center of the Russian Federation, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Denis V Abramochkin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye Gory, 1, 12, Moscow, Russia; Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russia; Laboratory of Cardiac Electrophysiology, National Medical Research Cardiological Complex (NMRCC), Institute of Experimental Cardiology, Moscow, Russia
| | - Halina Dobrzynski
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK; Heart Embryology and Anatomy Research Team, Department of Anatomy, Jagiellonian University Medical College, Cracow, Poland
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14
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Durkina AV, Bernikova OG, Mikhaleva NJ, Paderin NM, Sedova KA, Gonotkov MA, Kuzmin VS, Azarov JE. Melatonin pretreatment does not modify extrasystolic burden in the rat ischemia-reperfusion model. J Physiol Pharmacol 2021; 72. [PMID: 34272351 DOI: 10.26402/jpp.2021.1.15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 02/26/2021] [Indexed: 11/03/2022]
Abstract
The mechanism of reentrant ventricular tachyarrhythmias complicating acute myocardial ischemia is largely based on the interaction between an arrhythmogenic substrate and triggers. Melatonin was proposed as an antiarrhythmic medication and was shown to ameliorate the arrhythmogenic substrate. Also, melatonin provides a sympatholytic effect in different settings and might attenuate ectopic activity, which provides reentry triggers. In the present study, we aimed at evaluating the melatonin effects on cardiac sympathetic activity and the incidence of premature ventricular beats during the episode of ischemia-reperfusion. Experiments were done in a total of 26 control and 28 melatonin-treated (10 mg/kg, daily, for 7 days) male rats. Sympathetic fibers density was assessed by glyoxylic acid-induced fluorescence. Continuous electrocardiograms recording was performed during ischemia-reperfusion episodes (5 min/5 min, respectively) induced by reversible coronary occlusion. Myocardial expression of tyrosine hydroxylase, a rate-limiting enzyme of catecholamine biosynthesis was assessed by Western blotting. No differences in the state of sympathetic innervation were observed in histochemical analysis. However, Western blotting analysis demonstrated that melatonin treatment suppressed tyrosine hydroxylase expression in the non-ischemic (p < 0.05 versus control) but not ischemic regions of myocardium. The melatonin-treated animals had longer RR-intervals in the baseline state than the control animals (264 ± 48 ms versus 237 ± 33 ms, p = 0.044, respectively), but this difference decayed during the period of ischemia due to the increase of heart rate in the treated group. The number of premature ventricular beats did not differ between the control and treated groups during the ischemic and reperfusion periods. One-week melatonin pretreatment caused a slight peripheral sympatholytic effect that attenuated during ischemia and completely disappeared by the onset of reperfusion. The slight expression of sympathetic downregulation was associated with the lack of any effect of melatonin on extrasystolic burden. Collectively, the data suggest that melatonin cannot target the triggers of reentrant arrhythmias.
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Affiliation(s)
- A V Durkina
- Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia.
| | - O G Bernikova
- Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - N J Mikhaleva
- Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - N M Paderin
- Department of Molecular Immunology and Biotechnology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - K A Sedova
- Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, Kladno, Czech Republic
| | - M A Gonotkov
- Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - V S Kuzmin
- Department of Human and Animal Physiology, Biological Faculty, Lomonosov Moscow State University, Moscow, Russia
| | - J E Azarov
- Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
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15
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Filatova TS, Abramochkin DV, Pavlova NS, Pustovit KB, Konovalova OP, Kuzmin VS, Dobrzynski H. Repolarizing potassium currents in working myocardium of Japanese quail: a novel translational model for cardiac electrophysiology. Comp Biochem Physiol A Mol Integr Physiol 2021; 255:110919. [DOI: 10.1016/j.cbpa.2021.110919] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 02/06/2021] [Accepted: 02/06/2021] [Indexed: 12/14/2022]
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16
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Ivanova AD, Filatova TS, Abramochkin DV, Atkinson A, Dobrzynski H, Kokaeva ZG, Merzlyak EM, Pustovit KB, Kuzmin VS. Attenuation of inward rectifier potassium current contributes to the α1-adrenergic receptor-induced proarrhythmicity in the caval vein myocardium. Acta Physiol (Oxf) 2021; 231:e13597. [PMID: 33306261 DOI: 10.1111/apha.13597] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 11/19/2020] [Accepted: 12/07/2020] [Indexed: 12/31/2022]
Abstract
AIM This study is aimed at investigation of electrophysiological effects of α1-adrenoreceptor (α1-AR) stimulation in the rat superior vena cava (SVC) myocardium, which is one of the sources of proarrhythmic activity. METHODS α1-ARs agonists (phenylephrine-PHE or norepinephrine in presence of atenolol-NE + ATL) were applied to SVC and atrial tissue preparations or isolated cardiomyocytes, which were examined using optical mapping, glass microelectrodes or whole-cell patch clamp. α1-ARs distribution was evaluated using immunofluorescence. Kir2.X mRNA and protein level were estimated using RT-PCR and Western blotting. RESULTS PHE or NE + ATL application caused a significant suppression of the conduction velocity (CV) of excitation and inexcitability in SVC, an increase in the duration of electrically evoked action potentials (APs), a decrease in the maximum upstroke velocity (dV/dtmax ) and depolarization of the resting membrane potential (RMP) in SVC to a greater extent than in atria. The effects induced by α1-ARs activation in SVC were attenuated by protein kinase C inhibition (PKC). The whole-cell patch clamp revealed PHE-induced suppression of outward component of IK1 inward rectifier current in isolated SVC, but not atrial myocytes. These effects can be mediated by α1A subtype of α-ARs found in abundance in rat SVC. The basal IK1 level in SVC was much lower than in atria as a result of the weaker expression of Kir2.2 channels. CONCLUSION Therefore, the reduced density of IK1 in rat SVC cardiomyocytes and sensitivity of this current to α1A-AR stimulation via PKC-dependent pathways might lead to proarrhythmic conduction in SVC myocardium by inducing RMP depolarization, AP prolongation, CV and dV/dtmax decrease.
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Affiliation(s)
- Alexandra D. Ivanova
- Department of Human and Animal Physiology Lomonosov Moscow State University Moscow Russia
| | - Tatiana S. Filatova
- Department of Human and Animal Physiology Lomonosov Moscow State University Moscow Russia
- Department of Physiology Pirogov Russian National Research Medical University Moscow Russia
| | - Denis V. Abramochkin
- Department of Human and Animal Physiology Lomonosov Moscow State University Moscow Russia
- Department of Physiology Pirogov Russian National Research Medical University Moscow Russia
- Laboratory of Cardiac Electrophysiology National Medical Research Center for Cardiology Moscow Russia
| | - Andrew Atkinson
- Faculty of Biology, Medicine and Health University of Manchester Manchester UK
| | - Halina Dobrzynski
- Faculty of Biology, Medicine and Health University of Manchester Manchester UK
- Heart Embryology and Anatomy Research Team Department of Anatomy Jagiellonian University Medical College Cracow Poland
| | - Zarema G. Kokaeva
- Department of Human and Animal Physiology Lomonosov Moscow State University Moscow Russia
| | - Ekaterina M. Merzlyak
- Shemiakin‐Ovchinnikov Institute of Bioorganic Chemistry Russian Academy of Science Moscow Russia
| | - Ksenia B. Pustovit
- Department of Human and Animal Physiology Lomonosov Moscow State University Moscow Russia
| | - Vladislav S. Kuzmin
- Department of Human and Animal Physiology Lomonosov Moscow State University Moscow Russia
- Department of Physiology Pirogov Russian National Research Medical University Moscow Russia
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17
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Potekhina VM, Averina OA, Razumov AA, Kuzmin VS, Rozenshtraukh LV. The local repolarization heterogeneity in the murine pulmonary veins myocardium contributes to the spatial distribution of the adrenergically induced ectopic foci. J Physiol Sci 2019; 69:1041-1055. [PMID: 31724110 PMCID: PMC10717041 DOI: 10.1007/s12576-019-00724-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Accepted: 10/23/2019] [Indexed: 12/11/2022]
Abstract
An atrial tachyarrhythmias is predominantly triggered by a proarrhythmic activity originate from the pulmonary veins (PV) myocardial sleeves; sympathetic or adrenergic stimulation facilitates PV proarrhythmia. In the present study the electrophysiological inhomogeneity, spatiotemporal characteristics of the adrenergically induced ectopic firing and sympathetic nerves distribution have been investigated in a murine PV myocardium to clarify mechanisms of adrenergic PV ectopy. Electrically paced murine PV demonstrate atrial-like pattern of conduction and atrial-like action potentials (AP) with longest duration in the mouth of PV. The application of norepinephrine (NE), agonists of α- and β-adrenergic receptors (ARs) or intracardiac nerves stimulation induced spontaneous AP in a form of periodical bursts or continuous firing. NE- or ARs agonists-induced SAP originated from unifocal ectopic foci with predominant localization in the region surrounding PV mouth, but not in the distal portions of a murine PV myocardium. A higher level of catecholamine content and catecholamine fiber network density was revealed in the PV myocardial sleeves relative to LA appendage. However, no significant local variation of catecholamine content and fiber density was observed in the murine PV. In conclusion, PV mouth region appear to be a most susceptible to adrenergic proarrhythmia in mice. Intrinsic spatial heterogeneity of AP duration can be considered as a factor influencing localization of the ectopic foci in PV.
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Affiliation(s)
- V M Potekhina
- Department of Human and Animal Physiology, Biological Faculty, Lomonosov Moscow State University, 1-12 Leninskie Gory, 119234, Moscow, Russia.
| | - O A Averina
- Institute of Functional Genomics, Lomonosov Moscow State University, Moscow, Russia
| | - A A Razumov
- Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, Russia
| | - V S Kuzmin
- Department of Human and Animal Physiology, Biological Faculty, Lomonosov Moscow State University, 1-12 Leninskie Gory, 119234, Moscow, Russia
- Pirogov Russian National Research Medical University (RNRMU), Moscow, Russia
| | - L V Rozenshtraukh
- Institute of Experimental Cardiology, National Medicine Research Cardiological Complex, Moscow, Russia
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18
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Kuzmin VS, Abramov AA, Egorov YV, Rosenshtraukh LV. Hypothermia-Induced Postrepolarization Refractoriness Is the Reason of the Atrial Myocardium Tolerance to the Bioelectrical Activity Disorders in the Hibernating and Active Ground Squirrel Citellus undulatus. Dokl Biol Sci 2019; 486:63-68. [PMID: 31317446 DOI: 10.1134/s0012496619030050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 03/18/2019] [Accepted: 03/18/2019] [Indexed: 11/23/2022]
Abstract
The electrophysiological mechanism of the atrial myocardium resistance to the cold-induced arrhythmias was studied in the hibernating ground squirrel Citellus undulatus. The atrial action potentials (APs) and refractoriness were recorded with microelectrodes in isolated multicellular preparations of the atrial myocardium taken from the hibernating and summer active ground squirrels (HS and SAS, respectively) at 37, 27, and 17°С to estimate the AP and refractoriness durations. In both HS and SAS, hypothermia increased the duration of the AP and refractoriness period (APD and RD, respectively), and in both animal groups RD was longer than APD under hypothermia but not at 37°С. This last observation can be a result of the postrepolarization refractoriness (PRR), which seems to contribute substantially to the atrial myocardium tolerance of the hibernating animals to the hypothermia-induced arrhythmias because it prevents afterdepolarizations.
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Affiliation(s)
- V S Kuzmin
- Institute of Experimental Cardiology, Russian Research and Production Cardiological Complex, Ministry of Health, 121552, Moscow, Russia.
| | - A A Abramov
- Institute of Experimental Cardiology, Russian Research and Production Cardiological Complex, Ministry of Health, 121552, Moscow, Russia
| | - Yu V Egorov
- Institute of Experimental Cardiology, Russian Research and Production Cardiological Complex, Ministry of Health, 121552, Moscow, Russia
| | - L V Rosenshtraukh
- Institute of Experimental Cardiology, Russian Research and Production Cardiological Complex, Ministry of Health, 121552, Moscow, Russia
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19
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Kuzmin VS, Egorov YV, Rozenshtraukh LV. [Electrhopysiological Effect of the Polyamine Spermine in Normoxic and Ischemic Ventricular Myocardium]. ACTA ACUST UNITED AC 2019; 59:43-51. [PMID: 30990140 DOI: 10.18087/cardio.2019.3.10240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Accepted: 04/13/2019] [Indexed: 11/18/2022]
Abstract
Cytoplasmic polyamines (PA) are involved in control of many cellular functions and are well known as regulators of so called inward-rectifier potassium ion channels. Nevertheless, functional significance of extracellular PA in the heart is poorly elucidated. Aim of this study was to study effects of endogenous PA spermine in the ventricular myocardium. Effects of the extracellular spermine were investigated in isolated multicellular preparations of rabbit and rat ventricular myocardium. Langendorff-perfused isolated rat and rabbit hearts were also used. Action potential (APs) duration and pattern of excitation in ventricular myocardium were estimated using standard microelectrode technique and optical mapping. Functional refractory periods were assessed in Langendorff perfused hearts with the help of programmedelectrical stimulation of the ventricle. In this study extracellular PA spermine (0.1-5 mM) induced shortening of the APs in multicellular preparations of rat ventricular myocardium registered using sharp microelectrode technique. However, spermine caused only weak effect in preparations of ventricular myocardium from rabbit heart: highest tested concentration of spermine (5 mM) induced 4.7 % APs shortening. Similarly, 0.1-1 mM of spermine was unable to alter substantially ventricular effective refractory periods in isolated perfused rabbit hearts. In two animal species tested (rat and rabbit) 0.1-1 mM of spermine failed to affect conduction velocity and activation pattern in ventricles of isolated Langendorff-perfused hearts under normoxia. However, in the rat no-flow model of ischemia-reperfusion extracellular spermine improved conduction of excitation in ventricles. Our results allow suggesting that extracellular spermine can prevent ischemia-induced proarrhythmic changes in ventricular myocardium probably due to reduction of calcium accumulation, but this effect is significant only when PA is applied in millimolar concentrations. Also, potential anti-ischemic effect of the PA may be species specific.
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Affiliation(s)
| | - Yu V Egorov
- Institute of Experimental Cardiology of National Medical Research Center for Cardiology
| | - L V Rozenshtraukh
- Institute of Experimental Cardiology of National Medical Research Center for Cardiology
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20
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Kuzmin VS, Potter DL, Arkhipov SN, Pavlov TS. Impaired autonomic cardiac regulation due to altered baroreceptor reflex sensitivity in conscious P2rX7 knockout rats. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.558.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Vladislav S Kuzmin
- Henry Ford Health SystemDetroitMI
- Lomonosov Moscow State UniversityMoscowRussian Federation
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Abramochkin DV, Kuzmin VS, Rosenshtraukh LV. A New Class III Antiarrhythmic Drug Niferidil Prolongs Action Potentials in Guinea Pig Atrial Myocardium via Inhibition of Rapid Delayed Rectifier. Cardiovasc Drugs Ther 2017; 31:525-533. [PMID: 29181609 DOI: 10.1007/s10557-017-6762-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
PURPOSE A new class III antiarrhythmic drug niferidil (RG-2) has been introduced as a highly effective therapy for cases of persistent atrial fibrillation, but ionic mechanisms of its action are poorly understood. In the present study, the effects of niferidil on action potential (AP) waveform and potassium currents responsible for AP repolarization were investigated in guinea pig atrial myocardium. METHODS APs were recorded with sharp glass microelectrodes in multicellular atrial preparations. Whole-cell patch-clamp technique was used to measure K+ currents in isolated myocytes. RESULTS In multicellular atrial preparations, 10-8 M niferidil effectively prolonged APs by 15.2 ± 2.8% at 90% repolarization level. However, even the highest tested concentrations, 10-6 M and 10-5 M failed to prolong APs more than 32.5% of control duration. The estimated concentration of niferedil for half-maximal AP prolongation was 1.13 × 10-8 M. Among the potassium currents responsible for AP repolarization phase, I K1 was found to be almost insensitive to niferidil. However, another inward rectifier, I KACh, was effectively suppressed by micromolar concentrations of niferidil with IC50 = 9.2 × 10-6 M. I KATP was much less sensitive to the drug with IC50 = 2.26 × 10-4 M. The slow component of delayed rectifier, I Ks, also demonstrated low sensitivity to niferidil-the highest used concentration, 10-4 M, decreased peak I Ks density to 46.2 ± 5.5% of control. Unlike I Ks, the rapid component of delayed rectifier, I Kr, appeared to be extremely sensitive to niferidil. The IC50 was 1.26 × 10-9 M. I Kr measured in ventricular myocytes was found to be less sensitive to niferidil with IC50 = 3.82 × 10-8 M. CONCLUSIONS Niferidil prolongs APs in guinea pig atrial myocardium via inhibition of I Kr.
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Affiliation(s)
- Denis V Abramochkin
- Lomonosov Moscow State University, Moscow, Russia. .,Pirogov Russian National Research Medical University, Moscow, Russia. .,Department of Human and Animal Physiology, Moscow State University, Leninskije Gory, 1, 12, Moscow, Russia.
| | - Vladislav S Kuzmin
- Lomonosov Moscow State University, Moscow, Russia.,Pirogov Russian National Research Medical University, Moscow, Russia.,Institute of Experimental Cardiology, Moscow, Russia
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Ivanova AD, Kuzmin VS, Rosenshtraukh LV. β-Adrenergic stimulation induces pro-arrhythmic activity in the caval vein myocardial tissue. Dokl Biol Sci 2017; 476:183-187. [PMID: 29101618 DOI: 10.1134/s0012496617050027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Indexed: 11/23/2022]
Abstract
Electrical activity of the right superior vena cava (SVC) is considered as a source of the atrial fibrillation. We have shown that bioelectrical properties of the SVC myocardium differ from those of the working atrial myocardium. Electrically evoked action potential duration in SVC is significantly shorter, the resting membrane potential in both stimulated and quiescent SVC preparations is significantly more positive than in atria. Activation of β-adrenoreceptors in SVC myocardium leads to a series of action potentials, and this process depends on protein kinase A. Probably, β-adrenergic stimulation enhances SVC arrhythmogenesis in vivo.
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Affiliation(s)
- A D Ivanova
- Department of Human and Animal Physiology, Biological Faculty, Moscow State University, Moscow, Russia.
| | - V S Kuzmin
- Department of Human and Animal Physiology, Biological Faculty, Moscow State University, Moscow, Russia.,Pirogov National Research Medical University, Ministry of Health, Moscow, Russia
| | - L V Rosenshtraukh
- Institute of Experimental Cardiology, Russian Cardiology Research Center, Ministry of Health, Moscow, Russia
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Rozenshtraukh LV, Karimova VM, Kuzmin VS. [Intracellular Molecular Mechanisms of Adrenergic Regulation of Pulmonary Vein Myocardium Membrane Potential]. Kardiologiia 2017; 57:34-41. [PMID: 29276916 DOI: 10.18087/cardio.2017.11.10052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Pulmonary vein (PV) myocardium is characterized by numerous electrophysiological properties which make this tissue highly prone to spontaneous, ectopic activity partially due to resting potential (RP) instability. PV derived ectopy frequently underlies supraventricular arrhythmias, including atrial fibrillation. It has also been demonstrated that adrenergic stimulation causes proarrhythmic alterations in PV. Selective α1- and β-adrenoreceptors stimulation causes RP depolarization and hyperpolarization, respectively, at least in rats. The intracellular mechanisms of α1- and β-adrenoreceptors-dependent RP drifts are not investigated. Adenylate cyclase (AC) activator forscolin similarly to selective β-adrenoreceptors agonist isoproterenol (ISO) induced strong hyperpolarization in quiescent isolated perfused multicellular preparations of rat PV. Maximal value of hyperpolarization in PV was equal after application of both compounds. Proteinkinase A (PKA) inhibitors КТ5720, H-89 and Rp-adenosine-cAMP suppressed ISO-induced hyperpolarization in PV. Inhibitors of phospholipase C (U73122) or D (FIPI), similarly to proteinkinase C (PKC) inhibitor chelerythrine, failed to suppress α-adrenoreceptors-dependent phenylephrine-induced depolarization in rat PV myocardium. These results allow us to suggest that β-adrenoreceptors-dependent RP hyperpolarization in quiescent rat PV myocardium is only partially mediated by cAMP-dependent signal transduction pathway and by PKA. Besides, PKA-independent mechanisms also contribute to β-agonists effects in PV. In addition, α-adrenoreceptors-dependent depolarization in rat PV myocardium could be independent on PLC and PKC.
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Affiliation(s)
- L V Rozenshtraukh
- Institute of Cardiology of Russian Cardiology Scientific and Production Complex
| | - V M Karimova
- Federal State Budgetary Educational Institution of Higher Education, "M. V. Lomonosov Moscow State University"
| | - V S Kuzmin
- Federal State Budgetary Educational Institution of Higher Education, "M. V. Lomonosov Moscow State University"
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Bogus SK, Kuzmin VS, Abramochkin DV, Suzdalev KF, Galenko-Yaroshevsky PA. Effects of new antiarrhythmic agent SS-68 on excitation conduction, electrical activity in Purkinje fibers and pulmonary veins: Assessment of safety and side effects risk. J Pharmacol Sci 2017; 133:122-129. [DOI: 10.1016/j.jphs.2017.01.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 01/15/2017] [Accepted: 01/30/2017] [Indexed: 01/08/2023] Open
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Karimova VM, Kuzmin VS, Undrovinas NA, Rozenshtraukh LV. The role of cytoplasmic calcium in the regulation of the resting potential in the pulmonary veins myocardium in rats and mice. Dokl Biol Sci 2016; 469:152-155. [PMID: 27595819 DOI: 10.1134/s0012496616040050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Indexed: 06/06/2023]
Abstract
We have demonstrated the phenomenon of Са(2+)-induced hyperpolarization in the myocardium of pulmonary veins (PVs) in rats. An increase in cytoplasmic calcium [Са(2+)] i was shown to shift the resting potential (RP) in the PVs towards more negative values. The compounds inducing an increase in [Са(2+)] i , such as isoproterenol (10 μM), caffeine (5 mM), and ryanodine (0.01 μM), caused hyperpolarization of 10 ± 2, 9 ± 1.3, and 4.1 ± 2 mV, respectively. The inhibition of calcium-dependent potassium currents (IKCa) did not change RP of PVs under the control conditions and did not affect the Са(2+)-induced hyperpolarization.
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Affiliation(s)
- V M Karimova
- Russian Cardiologic Research and Manufacturing Complex, Ministry of Health of the Russian Federation, Moscow, Russia.
| | - V S Kuzmin
- Russian Cardiologic Research and Manufacturing Complex, Ministry of Health of the Russian Federation, Moscow, Russia
| | - N A Undrovinas
- Russian Cardiologic Research and Manufacturing Complex, Ministry of Health of the Russian Federation, Moscow, Russia
| | - L V Rozenshtraukh
- Russian Cardiologic Research and Manufacturing Complex, Ministry of Health of the Russian Federation, Moscow, Russia
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Kuzmin VS, Pustovit KB, Abramochkin DV. Effects of exogenous nicotinamide adenine dinucleotide (NAD+) in the rat heart are mediated by P2 purine receptors. J Biomed Sci 2016; 23:50. [PMID: 27350532 PMCID: PMC4924331 DOI: 10.1186/s12929-016-0267-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 06/17/2016] [Indexed: 12/13/2022] Open
Abstract
Background Recently, NAD+ has been considered as an essential factor, participating in nerve control of physiological functions and intercellular communication. NAD+ also has been supposed as endogenous activator of P1 and P2 purinoreceptors. Effects of extracellular NAD+ remain poorly investigated in cardiac tissue. This study aims to investigate the effects of extracellular NAD+ in different types of supraventricular and ventricular working myocardium from rat and their potential mechanisms. Methods The standard technique of sharp microelectrode action potential recording in cardiac multicellular preparations was used to study the effects of NAD+. Results Extracellular NAD+ induced significant changes in bioelectrical activity of left auricle (LA), right auricle (RA), pulmonary veins (PV) and right ventricular wall (RV) myocardial preparations. 10–100 μM NAD+ produced two opposite effects in LA and RA – quickly developing and transient prolongation of action potentials (AP) and delayed sustained AP shortening, which follows the initial positive effect. In PV and RV only AP shortening was observed in response to NAD+ application. In PV preparations AP shortening induced by NAD+ may be considered as a potential proarrhythmic effect. Revealed cardiotropic effects of NAD+ are likely to be mediated by P2 purine receptors, since P1 blocker DPCPX failed to affect them and P2 antagonist suramin abolished NAD + −induced alterations of electrical activity. P2X receptors may be responsible for NAD + −induced short-lasting AP prolongation, while P2Y receptors mediate persistent AP shortening. The latter effect is partially removed by PLC inhibitor U73122 showing the potential involvement of phosphoinositide signaling pathway in mediation of NAD+ cardiotropic effects. Conclusions Extracellular NAD+ is supposed to be a novel regulator of cardiac electrical activity. P2 receptors represent the main target of NAD+ at least in the rat heart.
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Affiliation(s)
- Vladislav S Kuzmin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskie gory 1, building 12, Moscow, 119991, Russia.,Department of Physiology, Pirogov Russian National Research Medical University, Ostrovitjanova 1, Moscow, 117997, Russia
| | - Ksenia B Pustovit
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskie gory 1, building 12, Moscow, 119991, Russia.,Department of Physiology, Pirogov Russian National Research Medical University, Ostrovitjanova 1, Moscow, 117997, Russia
| | - Denis V Abramochkin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskie gory 1, building 12, Moscow, 119991, Russia. .,Department of Physiology, Pirogov Russian National Research Medical University, Ostrovitjanova 1, Moscow, 117997, Russia.
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Pustovit KB, Kuzmin VS, Abramochkin DV. Diadenosine tetra- and pentaphosphates affect contractility and bioelectrical activity in the rat heart via P2 purinergic receptors. Naunyn Schmiedebergs Arch Pharmacol 2015; 389:303-13. [PMID: 26680209 DOI: 10.1007/s00210-015-1199-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 12/09/2015] [Indexed: 11/26/2022]
Abstract
Diadenosine polyphosphates (Ap(n)As) are endogenously produced molecules which have been identified in various tissues of mammalian organism, including myocardium. Ap(n)As contribute to the blood clotting and are also widely accepted as regulators of blood vascular tone. Physiological role of Ap(n)As in cardiac muscle has not been completely elucidated. The present study aimed to investigate the effects of diadenosine tetra- (Ap4A) and penta- (Ap5A) polyphosphates on contractile function and action potential (AP) waveform in rat supraventricular and ventricular myocardium. We have also demonstrated the effects of A4pA and Ap5A in myocardial sleeves of pulmonary veins (PVs), which play a crucial role in genesis of atrial fibrillation. APs were recorded with glass microelectrodes in multicellular myocardial preparations. Contractile activity was measured in isolated Langendorff-perfused rat hearts. Both Ap4A and Ap5A significantly reduced contractility of isolated Langendorff-perfused heart and produced significant reduction of AP duration in left and right auricle, interatrial septum, and especially in right ventricular wall myocardium. Ap(n)As also shortened APs in rat pulmonary veins and therefore may be considered as potential proarrhythmic factors. Cardiotropic effects of Ap4A and Ap5A were strongly antagonized by selective blockers of P2 purine receptors suramin and pyridoxalphosphate-6-azophenyl-2',4'-disulfonic acid (PPADS), while P1 blocker DPCPX was not effective. We conclude that Ap(n)As may be considered as new class of endogenous cardioinhibitory compounds. P2 purine receptors play the central role in mediation of Ap4A and Ap5A inhibitory effects on electrical and contractile activity in different regions of the rat heart.
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Affiliation(s)
- Ksenia B Pustovit
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye gory 1, building 12, Moscow, 119991, Russia
- Department of Physiology, Pirogov Russian National Research Medical University, Ostrovitjanova 1, Moscow, 117997, Russia
| | - Vladislav S Kuzmin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye gory 1, building 12, Moscow, 119991, Russia
- Department of Physiology, Pirogov Russian National Research Medical University, Ostrovitjanova 1, Moscow, 117997, Russia
| | - Denis V Abramochkin
- Department of Human and Animal Physiology, Lomonosov Moscow State University, Leninskiye gory 1, building 12, Moscow, 119991, Russia.
- Department of Physiology, Pirogov Russian National Research Medical University, Ostrovitjanova 1, Moscow, 117997, Russia.
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Kuzmin VS, Egorov YV, Karimova VM, Rosenshtraukh LV. Evaluation of the length constant in the atrial myocardium and pulmonary vein myocardium in mammals. Dokl Biol Sci 2015; 460:8-11. [PMID: 25773241 DOI: 10.1134/s0012496615010093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Indexed: 11/23/2022]
Affiliation(s)
- V S Kuzmin
- Department of Electrophysiology, Institute of Experimental Cardiology, Russian Cardiological Research and Production Complex, Ministry of Health of the Russian Federation, Moscow, 121552, Russia,
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Abramochkin DV, Tennova NV, Hirazova EE, Pizgareva AV, Kuzmin VS, Sukhova GS. Bioelectrical activity in the heart of the lugworm Arenicola marina. J Comp Physiol B 2010; 180:645-51. [DOI: 10.1007/s00360-010-0454-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2009] [Revised: 02/08/2010] [Accepted: 02/09/2010] [Indexed: 12/01/2022]
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Abramochkin DV, Kuzmin VS, Sukhova GS, Rosenshtraukh LV. Modulation of rabbit sinoatrial node activation sequence by acetylcholine and isoproterenol investigated with optical mapping technique. Acta Physiol (Oxf) 2009; 196:385-94. [PMID: 19302260 DOI: 10.1111/j.1748-1716.2009.01963.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS Changes in the rabbit sinoatrial node (SAN) activation sequence with the cholinergic and adrenergic factors were studied. The correlation between the sinus rhythm rate and the leading pacemaker site shift was determined. The hypothesis concerning the cholinergic suppression of nodal cell excitability as one of the mechanisms associated with pacemaker shift was tested. METHODS A high-resolution optical mapping technique was used to register beat-to-beat changes in the SAN activation pattern under the influence of the cholinergic and adrenergic factors. RESULTS Acetylcholine (10 microm) and strong intramural parasympathetic nerve stimulation caused a pacemaker shift as well as rhythmic slowing and the formation of an inexcitable region in the central part of SAN. In this region the generation of action potentials was suppressed. The slowing of the sinus rhythm (which exceeded 12.8 +/- 3.1% of the rhythm control rate) always accompanied the pacemaker shift. Isoproterenol (10, 100 nm, 1 microm) and sympathetic postganglionic nerve stimulation also evoked a pacemaker shift but without formation of an inexcitable zone. The acceleration of the sinus rhythm, which exceeded 10.5 +/- 1.3% of the control rate of the rhythm, always accompanied the shift. CONCLUSIONS Both cholinergic and adrenergic factors cause pacemaker shifts in the rabbit SAN. While modest changes in the sinus rhythm do not coincide with the pacemaker shift, greater changes always accompany the shift and may be caused by it, according to one hypothesis. The formation of an inexcitable zone at the place where the leading pacemaker is situated is one of the mechanisms associated with pacemaker shift.
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Affiliation(s)
- D V Abramochkin
- Laboratory of Cardiac Electrophysiology, Institute of Experimental Cardiology, Moscow, Russia.
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Pogorelov AG, Kokoz IM, Dubrovkin MI, Pogorelova VN, Korystov AF, Kuzmin VS. [A comparative analysis of the intracellular potassium content for the cardiomyocyte in papillary muscle tissue and in a primary heart culture]. Tsitologiia 1998; 39:829-34. [PMID: 9518389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
This work was aimed to examine potassium contents in heart myocytes. The intracellular concentration of this element was measured with electron probe microanalysis (EPMA). The cardiomyocyte was studied in samples of the papillary muscle tissue and in heart primary culture. The low temperature fixation was applied to the sample preparation. As a result, cells of the primary heart culture were shown to be separated into three kinds of myocytes, defined by their different shape, size and cellular potassium content. The rod cardial cell, to be used for electrophysiological assays, has potassium and sodium concentrations close to those of the papillary muscle. The difference in potassium concentrations is to be explained presumably by the injury of cell membrane during the primary culture preparation. Healing over the membrane is likely to parallel with the membrane damage resulting from a continuous destruction of the cellular assembly in primary culture.
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Affiliation(s)
- A G Pogorelov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino
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