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Wu CJ, Li YH, Chen HH. Paricalcitol improved cardiac hypertrophy and fibrosis through upregulation of fibroblast growth factor-23 and downregulation of transforming growth factor-beta in a rat model of isoproterenol-induced cardiomyopathy. CHINESE J PHYSIOL 2023; 66:306-312. [PMID: 37929341 DOI: 10.4103/cjop.cjop-d-23-00048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023] Open
Abstract
Acute cardiomyopathy is a significant global health concern and one of the leading causes of death in developed countries. Prior studies have shown an association between acute cardiomyopathy and low vitamin D levels. Although paricalcitol, a vitamin D receptor (VDR) activator, has demonstrated clinical benefits in patients with advanced kidney disease, its effect on cardiac remodeling in cardiomyopathy is unknown. This study aimed to investigate the relative effects of paricalcitol on cardiomyopathy in rats. Wistar-Kyoto rats were administered vehicle (sham control group) or isoproterenol to induce cardiomyopathy. Rats administered isoproterenol were subsequently treated with paricalcitol (experimental group) or vehicle (isoproterenol group). Picrosirius red and immunofluorescence staining were used to analyze cardiac fibrosis and hypertrophy. Immunohistochemistry staining was used to confirm the molecular mechanisms involved in isoproterenol-induced cardiomyopathy in rats. Injection of paricalcitol could reduce collagen and transforming growth factor-beta 1 (TGF-β1) levels while activating fibroblast growth factor receptor 1 (FGFR1) and fibroblast growth factor-23 (FGF23) without the help of Klotho, thereby reducing myocardial hypertrophy and fibrosis. As a VDR activator, paricalcitol reduces isoproterenol-induced cardiac fibrosis and hypertrophy by reducing the expression of TGF-β1 and enhancing the expression of VDR, FGFR1, and FGF23.
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Affiliation(s)
- Chieh-Jen Wu
- Division of Cardiovascular Surgery, Department of Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Yu-He Li
- Department of Laboratory Medicine, Zuoying Branch of Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Hsin-Hung Chen
- Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
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2
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Spasov AA, Gurova NA, Popova TA, Perfilova VN, Vishnevskaya VV, Kustova MV, Ovsyankina NV, Ozerov AA. Effects of Zoniporide and BMA-1321 Compound on the Rate of Oxygen Absorption by Cardiomyocyte Mitochondria in Rats with Experimental Chronic Heart Failure. Bull Exp Biol Med 2021; 170:316-320. [PMID: 33452978 DOI: 10.1007/s10517-021-05059-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Indexed: 11/28/2022]
Abstract
Uncoupling of respiration and ATP production by myocardial mitochondria was observed in rats with chronic isoproterenol intoxication (L-isoproterenol subcutaneously, 1 mg/kg, for 10 days) in comparison with controls (injected with the solvent). Inhibitors of NHE-1 zoniporide (1 mg/kg intraperitoneally, 13 days) and BMA-1321 compound (0.92 mg/kg intraperitoneally, 13 days) improved the mitochondrial function in rats with isoproterenol-induced cardiac failure: respiratory control coefficients increased, more so for the respiratory chain complex II, the main source of ROS in heart failure. The effect of BMA-1321 was more manifest (53%; p<0.05) in comparison with zoniporide (35%; p<0.05).
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Affiliation(s)
- A A Spasov
- Volgograd State Medical University, Ministry of Health of Russian Federation, Volgograd, Russia.,Volgograd Medical Research Center, Volgograd, Russia
| | - N A Gurova
- Volgograd State Medical University, Ministry of Health of Russian Federation, Volgograd, Russia.
| | - T A Popova
- Volgograd State Medical University, Ministry of Health of Russian Federation, Volgograd, Russia
| | - V N Perfilova
- Volgograd State Medical University, Ministry of Health of Russian Federation, Volgograd, Russia
| | - V V Vishnevskaya
- Volgograd State Medical University, Ministry of Health of Russian Federation, Volgograd, Russia
| | - M V Kustova
- Volgograd State Medical University, Ministry of Health of Russian Federation, Volgograd, Russia
| | - N V Ovsyankina
- Volgograd State Medical University, Ministry of Health of Russian Federation, Volgograd, Russia
| | - A A Ozerov
- Volgograd State Medical University, Ministry of Health of Russian Federation, Volgograd, Russia.,Volgograd Medical Research Center, Volgograd, Russia
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Obata K, Morita H, Takaki M. The energy-saving effect of a new myosin activator, omecamtiv mecarbil, on LV mechanoenergetics in rat hearts with blood-perfused isovolumic contraction model. Naunyn Schmiedebergs Arch Pharmacol 2019; 392:1065-1070. [PMID: 31267148 DOI: 10.1007/s00210-019-01685-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 06/26/2019] [Indexed: 01/10/2023]
Abstract
A novel myosin activator, omecamtiv mecarbil (OM), is a cardiac inotropic agent with a unique new mechanism of action, which is thought to arise from an increase in the transition rate of myosin into the actin-bound force-generating state without increasing calcium (Ca2+) transient. There remains, however, considerable controversy about the effects of OM on cardiac contractility and energy expenditure. In the present study, we investigated the effects of OM on left ventricular (LV) mechanical work and energetics, i.e., mechanoenergetics in rat normal hearts (CTL) and failing hearts induced by chronic administration of isoproterenol (1.2 mg/kg/day) for 4 weeks (ISO-HF). We analyzed the LV end-systolic pressure-volume relation (ESPVR) and the linear relation between the myocardial oxygen consumption per beat (VO2) and systolic pressure-volume area (PVA; a total mechanical energy per beat) in isovolumically contracting rat hearts at 240- or 300-bpm pacing in the absence or presence of OM. OM did not change the ESPVR in CTL and ISO-HF. OM, however, significantly decreased the slope of VO2-PVA relationship in both CTL and ISO-HF, and significantly increased the mean VO2 intercept without changes in basal metabolism in ISO-HF. These results suggested that OM improved the oxygen cost of PVA (contractile efficiency) with the unchanged LV contractility in both CTL and ISO-HF but increased VO2 for Ca2+ handling in excitation-contraction (E-C) coupling in ISO-HF. We concluded that OM improves contractile efficiency in normal and failing hearts but increases O2 consumption of Ca2+ handling in failing hearts in isovolumically contracting rat model.
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Affiliation(s)
- Koji Obata
- Department of Physiology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu, 501-1194, Japan.
| | - Hironobu Morita
- Department of Physiology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu, 501-1194, Japan
| | - Miyako Takaki
- Department of Physiology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu, 501-1194, Japan
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Popova TA, Muzyko EA, Kustova MV, Bychenkova MA, Perfilova VN, Prokofiev II, Samoylova MA, Tyurenkov IN, Latypova GM, Kataev VA. [Influence of the dense extract from herb of Primula veris L. On the oxidative stress development and the functional state of the cardiomyocytes mitochondria of rats with experimental chronic heart failure]. BIOMEDIT︠S︡INSKAI︠A︡ KHIMII︠A︡ 2018; 64:334-343. [PMID: 30135280 DOI: 10.18097/pbmc20186404334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
Experimental chronic heart failure (CHF), caused by administration of L-isoproterenol (2.5 mg/kg twice a day intraperitoneally for 21 days), promotes uncoupling of respiration and oxidative phosphorylation. The rate of mitochondrial oxygen consumption in the metabolic state V3 by Chance in animals with CHF decreased by 53.3% (p<0.05) with malate using (as an oxidation substrate feeding сomplex I of the electron transport chain (ETC)), by 70.6% (p<0.05) with succinate using (сomplex II substrate) and by 63.6% (p<0.05) when malate and succinate were added simultaneously. The respiratory control ratio significantly decreased 2.3 times for сomplex I, 2.5 for сomplex II, and 2.6 times for the simultaneous operation of two respiratory chain complexes in mitochondria of CHF rats compared to intact animals. Mitochondrial dysfunction in experimental CHF is evidently due to the development of oxidative stress. It was revealed that the content of malonic dialdehyde (MDA) in the group of rats with experimental CHF was higher by 54.7% (p<0.05), as compared with intact animals. The activity of superoxide dismutase (SOD) and catalase was lower by 17.5% (p<0.05), and by 18.4%, respectively than in the intact group. The dense extract from herba of Primula veris L. (DEHPV) 30 mg/kg limits the development of mitochondrial dysfunction in rats with experimental CHF, as evidenced by an increase in the role of V3 respiration for the first and second respiratory chain complexes in 1.7 (p<0.05) and 2.0 times (p<0.05), respectively, the ratio of respiratory control (RCR) - 1.7 times (p<0.05) for сomplex I and 2 times (p<0.05) for сomplex II compared with the negative control. The concentration of MDA was by 15.7% (p<0.05), lower and the activity of SOD was by 56.3% (p<0.05) higher.
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Affiliation(s)
- T A Popova
- Volgograd State Medical University, Volgograd, Russia
| | - E A Muzyko
- Volgograd State Medical University, Volgograd, Russia
| | - M V Kustova
- Volgograd State Medical University, Volgograd, Russia
| | | | - V N Perfilova
- Volgograd State Medical University, Volgograd, Russia
| | - I I Prokofiev
- Volgograd State Medical University, Volgograd, Russia
| | - M A Samoylova
- Volgograd State Medical University, Volgograd, Russia
| | - I N Tyurenkov
- Volgograd State Medical University, Volgograd, Russia
| | | | - V A Kataev
- Bashkir State Medical University, Ufa, Russia
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Paricalcitol Attenuates Cardiac Fibrosis and Expression of Endothelial Cell Transition Markers in Isoproterenol-Induced Cardiomyopathic Rats. Crit Care Med 2017; 44:e866-74. [PMID: 27065465 DOI: 10.1097/ccm.0000000000001736] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
OBJECTIVES Acute cardiomyopathy is a health problem worldwide. Few studies have shown an association between acute cardiomyopathy and low vitamin D status. Paricalcitol, a vitamin D receptor activator, clinically benefits patients with advanced kidney disease. The effect of paricalcitol supplement on cardiac remodeling in cardiomyopathic rats is unknown. This experimental study investigated the effect of paricalcitol in rats with cardiomyopathy induced by isoproterenol. DESIGN Prospective, randomized, controlled experimental study. SETTING Hospital-affiliated animal research institution. SUBJECTS Eight-week-old male Wistar-Kyoto rats. INTERVENTIONS Male Wistar-Kyoto rats were first injected intraperitoneally with isoproterenol to create a rat model of acute cardiomyopathy. Then paricalcitol was administered intraperitoneally to isoproterenol-injected rats at a dosage of 200 ng three times a week for 3 weeks. Relevant cardiomyopathy-related variables were measured regularly in three groups of rats, controls, isoproterenol, and isoproterenol plus paricalcitol. Rat hearts were obtained for evaluation of cardiac fibrosis using Masson trichrome staining and commercially available software, and evaluation of cell transition using immunofluorescence staining analysis. MEASUREMENTS AND MAIN RESULTS Isoproterenol infusions generated significant cardiac fibrosis (p < 0.001). Subsequent paricalcitol treatment attenuated the isoproterenol-induced cardiac fibrosis (p = 0.006). Fluorescence showed colocalization of endothelial and fibroblast cell markers (cluster differentiation 31 and α-smooth muscle actin, respectively) in the isoproterenol-treated hearts. Paricalcitol injections attenuated the isoproterenol-induced fluorescence intensity of two cell markers (p < 0.01). CONCLUSIONS Paricalcitol injections may ameliorate isoproterenol-induced cardiac fibrosis possibly through regulating cell transition.
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Mohamed IA, Gadeau AP, Fliegel L, Lopaschuk G, Mlih M, Abdulrahman N, Fillmore N, Mraiche F. Na+/H+ exchanger isoform 1-induced osteopontin expression facilitates cardiomyocyte hypertrophy. PLoS One 2015; 10:e0123318. [PMID: 25884410 PMCID: PMC4401699 DOI: 10.1371/journal.pone.0123318] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Accepted: 03/02/2015] [Indexed: 01/02/2023] Open
Abstract
Enhanced expression and activity of the Na+/H+ exchanger isoform 1 (NHE1) has been implicated in cardiomyocyte hypertrophy in various experimental models. The upregulation of NHE1 was correlated with an increase in osteopontin (OPN) expression in models of cardiac hypertrophy (CH), and the mechanism for this remains to be delineated. To determine whether the expression of active NHE1-induces OPN and contributes to the hypertrophic response in vitro, cardiomyocytes were infected with the active form of the NHE1 adenovirus or transfected with OPN silencing RNA (siRNA-OPN) and characterized for cardiomyocyte hypertrophy. Expression of NHE1 in cardiomyocytes resulted in a significant increase in cardiomyocyte hypertrophy markers: cell surface area, protein content, ANP mRNA and expression of phosphorylated-GATA4. NHE1 activity was also significantly increased in cardiomyocytes expressing active NHE1. Interestingly, transfection of cardiomyocytes with siRNA-OPN significantly abolished the NHE1-induced cardiomyocyte hypertrophy. siRNA-OPN also significantly reduced the activity of NHE1 in cardiomyocytes expressing NHE1 (68.5±0.24%; P<0.05), confirming the role of OPN in the NHE1-induced hypertrophic response. The hypertrophic response facilitated by NHE1-induced OPN occurred independent of the extracellular-signal-regulated kinases and Akt, but required p90-ribosomal S6 kinase (RSK). The ability of OPN to facilitate the NHE1-induced hypertrophic response identifies OPN as a potential therapeutic target to reverse the hypertrophic effect induced by the expression of active NHE1.
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Affiliation(s)
| | - Alain-Pierre Gadeau
- University of Bordeaux, Adaptation Cardiovasculaire à L'ischémie, UMR1034, Pessac, France
| | - Larry Fliegel
- Department of Biochemistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Gary Lopaschuk
- Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Mohamed Mlih
- College of Pharmacy, Qatar University, Doha, Qatar
| | | | - Natasha Fillmore
- Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Fatima Mraiche
- College of Pharmacy, Qatar University, Doha, Qatar
- * E-mail:
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Na+/H+ exchanger isoform 1 induced cardiomyocyte hypertrophy involves activation of p90 ribosomal s6 kinase. PLoS One 2015; 10:e0122230. [PMID: 25830299 PMCID: PMC4382094 DOI: 10.1371/journal.pone.0122230] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Accepted: 02/10/2015] [Indexed: 01/30/2023] Open
Abstract
Studies using pharmacological and genetic approaches have shown that increased activity/expression of the Na+/H+ exchanger isoform 1 (NHE1) play a critical role in the pathogenesis of cardiac hypertrophy. Despite the importance of NHE1 in cardiac hypertrophy, severe cerebrovascular side effects were associated with the use of NHE1 inhibitors when administered to patients with myocardial infarctions. p90 ribosomal S6 Kinase (RSK), a downstream regulator of the mitogen-activated protein kinase pathway, has also been implicated in cardiac hypertrophy. We hypothesized that RSK plays a role in the NHE1 induced cardiomyocyte hypertrophic response. Infection of H9c2 cardiomyoblasts with the active form of the NHE1 adenovirus induced hypertrophy and was associated with an increase in the phosphorylation of RSK (P<0.05). Parameters of hypertrophy such as cell area, protein content and atrial natriuretic mRNA expression were significantly reduced in H9c2 cardiomyoblasts infected with active NHE1 in the presence of dominant negative RSK (DN-RSK) (P<0.05). These results confirm that NHE1 lies upstream of RSK. Increased phosphorylation and activation of GATA4 at Ser261 was correlated with increased RSK phosphorylation. This increase was reversed upon inhibition of RSK or NHE1. These findings demonstrate for the first time that the NHE1 mediated hypertrophy is accounted for by increased activation and phosphorylation of RSK, which subsequently increased the phosphorylation of GATA4; eventually activating fetal gene transcriptional machinery.
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8
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Liu T, Shi SB, Qin M, Huang CX. Effects of Dantrolene Treatment on Ventricular Electrophysiology and Arrhythmogenesis in Rats With Chronic β-Adrenergic Receptor Activation. J Cardiovasc Pharmacol Ther 2015; 20:414-27. [PMID: 25613464 DOI: 10.1177/1074248414568194] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 11/05/2014] [Indexed: 11/16/2022]
Abstract
Dantrolene, which is primarily used to treat malignant hyperthermia, has recently been suggested for the prevention of arrhythmogenesis in various animal models. In this study, the effects of dantrolene treatment on electrophysiological properties and ventricular arrhythmias (VAs) in rats with chronic β-adrenergic receptor (β-AR) activation were investigated. Rats were randomized to treatment with saline (control group), isoproterenol (ISO; ISO group), or ISO + dantrolene (ID group) for 2 weeks. An electrophysiological study was performed to assess action potential duration restitution (APDR) and induce action potential duration (APD) alternans or VA in vitro. The protein levels of Cav1.2, sarcoplasmic reticulum Ca2+-ATPase (SERCA2a), and ryanodine receptor 2 (RyR2) were detected by Western blot. Compared with the control group, chronic administration of ISO significantly increased APD, the maximum slope (Smax) of APDR curve, and the spatial dispersions of Smax and APD (all P < .01), and all effects were attenuated by dantrolene treatment (all P < .05). Additionally, chronic ISO administration significantly reduced the protein levels of SERCA2 and RyR2, but increased the Cav1.2 protein expression (all P < .05). However, compared with the ISO group, dantrolene treatment preserved SERCA2a and RyR2 protein levels and decreased Cav1.2 protein levels in the ID group (all P < .05). The intracellular Ca2+ ([Ca2+]i) levels measured by incubating isolated cardiomyocytes with Fluo-3/alveolar macrophages were significantly increased in the ISO group compared with the control group ( P < .01). Dantrolene treatment markedly reduced the rise of [Ca2+]i levels caused by chronic administration of ISO ( P < .05). Dantrolene treatment also prevented the reductions in the APD alternans and VA thresholds induced by chronic ISO stimulation (all P < .05). These data suggest that dantrolene stabilizes ventricular electrophysiological characteristics and increases the expression of key sarcoplasmic reticulum calcium cycling proteins to reduce vulnerability to VA in rats with chronic β-AR activation.
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Affiliation(s)
- Tao Liu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
- Cardiovascular Research Institute, Wuhan University, Wuhan, China
| | - Shao-bo Shi
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
- Cardiovascular Research Institute, Wuhan University, Wuhan, China
| | - Mu Qin
- Department of Cardiology, The First Clinical Medical College of Three Gorges University, Yichang, China
| | - Cong-xin Huang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
- Cardiovascular Research Institute, Wuhan University, Wuhan, China
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Li H, Lu ZZ, Chen C, Song Y, Xiao H, Zhang YY. Echocardiographic assessment of β-adrenoceptor stimulation-induced heart failure with reduced heart rate in mice. Clin Exp Pharmacol Physiol 2014; 41:58-66. [PMID: 24107096 DOI: 10.1111/1440-1681.12176] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 09/05/2013] [Accepted: 09/11/2013] [Indexed: 12/16/2022]
Abstract
1. Chronic injection with the β-adrenoceptor (β-AR) agonist isoproterenol (ISO) has been commonly used as an animal model of β-AR-induced cardiac remodelling and heart failure. This ISO-treated model usually exhibits significantly decreased conscious heart rate (HR). However, the HR in treatment groups is usually adjusted to the same levels by anaesthesia to assess cardiac geometry and function. In the present study, we report a method of echocardiographic assessment that represents the true cardiac geometry and function under conditions of ISO withdrawal. 2. Briefly, C57BL/6 mice were treated with 5 mg/kg per day ISO for 12 weeks. Cardiac geometry and function were assessed by high-resolution echocardiography in vehicle (saline) - and ISO-treated mice that were either conscious or anaesthetized using different concentrations of isoflurane. 3. The cardiac β-AR response was decreased in ISO-treated mice, as evidenced by markedly decreased conscious HR. Vehicle- and ISO-treated mice did not differ in terms of cardiac geometry or function when HR was adjusted to the same level (400 b.p.m.) in both treatment groups, but cardiac geometry and function did differ when a low (1%) rather than high (1.5% or 2%) isoflurane concentration was used to adjust HR. Furthermore, 3 day ISO withdrawal eliminated the difference in conscious HR between the two groups. In addition, the groups differed in cardiac geometry and function regardless of the isoflurane concentration used. 4. In conclusion, using isoflurane to decrease the HR of treated groups to the same level may mask left ventricular dysfunction in ISO-treated mice. Withdrawal of ISO eliminated the difference in basal HR between the ISO-treated and control groups on echocardiography, allowing a more accurate assessment of cardiac pathological and functional changes.
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Affiliation(s)
- Hao Li
- Institute of Vascular Medicine, Peking University Third Hospital, Beijing, China; Key Laboratory of Cardiovascular Molecular Biologyand Regulatory Peptide, Ministry of Health, Beijing, China; Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing, China
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10
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Shareef MA, Anwer LA, Poizat C. Cardiac SERCA2A/B: Therapeutic targets for heart failure. Eur J Pharmacol 2014; 724:1-8. [DOI: 10.1016/j.ejphar.2013.12.018] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2013] [Revised: 12/10/2013] [Accepted: 12/11/2013] [Indexed: 02/05/2023]
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Mitsuyama S, Takeshita D, Obata K, Zhang GX, Takaki M. Left ventricular mechanical and energetic changes in long-term isoproterenol-induced hypertrophied hearts of SERCA2a transgenic rats. J Mol Cell Cardiol 2013; 59:95-106. [DOI: 10.1016/j.yjmcc.2013.02.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 02/17/2013] [Accepted: 02/21/2013] [Indexed: 12/31/2022]
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12
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Ozakca I, Arioglu-Inan E, Esfahani H, Altan VM, Balligand JL, Kayki-Mutlu G, Ozcelikay AT. Nebivolol prevents desensitization of β-adrenoceptor signaling and induction of cardiac hypertrophy in response to isoprenaline beyond β1-adrenoceptor blockage. Am J Physiol Heart Circ Physiol 2013; 304:H1267-76. [DOI: 10.1152/ajpheart.00352.2012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The importance of chronic stimulation of β-adrenoceptors in the development of cardiac dysfunction is the rationale for the use of β-blockers in the treatment of heart failure. Nebivolol is a third-generation β-blocker, which has further properties including stimulation of endothelial nitric oxide synthase and/or β3-adrenoceptors. The aim of this study was to investigate whether nebivolol has additional effects on β-adrenoceptor-mediated functional responses along with morphologic and molecular determinants of cardiac hypertrophy compared with those of metoprolol, a selective β1-adrenoceptor blocker. Rats infused by isoprenaline (100 μg·kg−1·day−1, 14 days) were randomized into three groups according to the treatment with metoprolol (30 mg·kg−1·day−1), nebivolol (10 mg·kg−1·day−1), or placebo for 13 days starting on day 1 after implantation of minipump. Both metoprolol and nebivolol caused a similar reduction on heart rate. Nebivolol mediated a significant improvement on cardiac mass, coronary flow, mRNA expression levels of sarcoplasmic reticulum Ca2+ ATPase (SERCA2a) and atrial natriuretic peptide and phospholamban (PLN)/SERCA2a and phospho-PLN/PLN ratio compared with metoprolol and placebo. Nebivolol prevented the detrimental effects of isoprenaline infusion on isoprenaline (68% of control at 30 μM), BRL37344 (63% of control at 0.1 μM), and forskolin (64% of control at 1 μM) responses compared with metoprolol (isoprenaline, 34% of control; BRL37344, no response; forskolin, 26% of control) and placebo (isoprenaline, 33% of control; BRL37344, 28% of control; forskolin, 12% of control). Both β-blockers improved the changes in mRNA expressions of β1- and β3-adrenoceptors. Our results suggest that nebivolol partially protects the responsiveness of β-adrenoceptor signaling and the development of cardiac hypertrophy independent of its β1-adrenoceptor blocking effect.
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Affiliation(s)
- Isil Ozakca
- Department of Pharmacology, Faculty of Pharmacy, Ankara University, Ankara, Turkey; and
| | - Ebru Arioglu-Inan
- Department of Pharmacology, Faculty of Pharmacy, Ankara University, Ankara, Turkey; and
| | - Hrag Esfahani
- Pole of Pharmacology and Therapeutics, FATH/IREC, Universite Catholique de Louvain, Brussels, Belgium
| | - V. Melih Altan
- Department of Pharmacology, Faculty of Pharmacy, Ankara University, Ankara, Turkey; and
| | - Jean-Luc Balligand
- Pole of Pharmacology and Therapeutics, FATH/IREC, Universite Catholique de Louvain, Brussels, Belgium
| | - Gizem Kayki-Mutlu
- Department of Pharmacology, Faculty of Pharmacy, Ankara University, Ankara, Turkey; and
| | - A. Tanju Ozcelikay
- Department of Pharmacology, Faculty of Pharmacy, Ankara University, Ankara, Turkey; and
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Myocardial Na+/H+ exchanger-1 (NHE1) content is decreased by exercise training. J Physiol Biochem 2012; 69:305-12. [DOI: 10.1007/s13105-012-0214-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Accepted: 09/24/2012] [Indexed: 11/26/2022]
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14
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Chen MZ, Bu QT, Pang SC, Li FL, Sun MN, Chu EF, Li H. Tetrodotoxin attenuates isoproterenol-induced hypertrophy in H9c2 rat cardiac myocytes. Mol Cell Biochem 2012; 371:77-88. [DOI: 10.1007/s11010-012-1424-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Accepted: 08/01/2012] [Indexed: 11/30/2022]
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15
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Cardiac mechanoenergetics for understanding isoproterenol-induced rat heart failure. ACTA ACUST UNITED AC 2012; 19:163-70. [PMID: 22687629 DOI: 10.1016/j.pathophys.2012.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Revised: 12/06/2011] [Accepted: 12/11/2011] [Indexed: 11/23/2022]
Abstract
Considering from clinical implication, it is often complained that short-term experimental diseased heart models do not mimic long-term diseased hearts that one often clinically encountered. The left ventricle (LV) function in rat cardiac hypertrophy models treated with isoproterenol (ISO) up to 16 weeks was followed up with a non-invasive echocardiography. Infusion of either ISO (1.2mgkg(-1)day(-1) for 3 days-16 weeks) or vehicle (saline 24μlday(-1) for 3 days-16 weeks; SA group) was performed by subcutaneously implanting osmotic minipump. LV and right ventricle (RV) weight ratios to body weight (mgg(-1)) in SA, ISO3d, ISO7d and ISO4w were: 1.94±0.10 and 0.54±0.04 (n=7), 2.56±0.10 and 0.66±0.05 (n=7), 2.50±0.25 and 0.64±0.07 (n=10) and 2.40±0.08 and 0.59±0.08 (n=9), respectively. From echocardiography, the LV function of the hypertrophy models at 3 days, 1 and 2 weeks was unchanged but the model at the longer-term than 4 weeks resulted in prolonged systolic failure. These results indicated that only 3-day ISO infusion induced the hypertrophy model similar in shape and function to that induced by 2-week ISO infusion; the 3-day model sufficiently represents the effects of 2-week ISO infusion. In this review, left ventricular (LV) function was compared between rat cardiac hypertrophy models treated with ISO for 3 days (ISO3d) and 7 days (ISO7d) by analyzing LV mechanical work and energetics. The LV mechanical work and energetics was unchanged in SA, ISO3d and ISO7d groups. The LV relaxation rate at 240bpm in ISO3d and ISO7d groups was significantly slower than that in SA group with unchanged contraction rate. The amounts of expression of sarcoplasmic reticulum Ca(2+)-ATPase (SERCA2a), phospholamban (PLB), phosphorylated-Ser(16) PLB (p-PLB), phospholemman (PLM) and Na(+)-K(+)-ATPase (NKA) are significantly decreased in ISO3d and ISO7d groups. Furthermore, the marked collagen production (types I and III) was observed in ISO3d and ISO7d groups. These results suggested the possibility that physiological LV function is compensated, although molecular changes have been generated even in the short-term hypertrophy model. Although a novel histone deacetylase (HDAC) inhibitor, has some beneficial effects on hemodynamics, it has no effects of anti-hypertrophic modalities in ISO3d model. However, a selective sodium proton exchanger-1 (NHE-1) inhibitor normalized ISO-induced down-regulation of SERCA2a without changes in pPLB/PLB expression in the ISO7d model and ameliorates cardiac Ca(2+) handling impairment and prevents the development of cardiac dysfunction. This result indicated that SERCA2a is a key molecule in the ISO7d model. Slow LV relaxation rate in ISO7d model may be due to down-regulation of SERCA2a. In conclusion, lowering the heart rate make it possible to rescue the impairment of LV mechanical work and energetics in the ISO-induced compensatory hypertrophied rat hearts, providing basic evidence for clinical therapy for patients with some types of cardiac failure.
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NHE-1 blockade reversed changes in calcium transient in myocardial slices from isoproterenol-induced hypertrophied rat left ventricle. Biochem Biophys Res Commun 2012; 419:431-5. [DOI: 10.1016/j.bbrc.2012.02.041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Accepted: 02/07/2012] [Indexed: 11/24/2022]
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