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Medeiros-Lima DJ, Carvalho JJ, Tibirica E, Borges JP, Matsuura C. Time course of cardiomyopathy induced by doxorubicin in rats. Pharmacol Rep 2019; 71:583-590. [DOI: 10.1016/j.pharep.2019.02.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 01/27/2019] [Accepted: 02/19/2019] [Indexed: 01/09/2023]
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2
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Autonomic dysfunction in early breast cancer: Incidence, clinical importance, and underlying mechanisms. Am Heart J 2015; 170:231-41. [PMID: 26299219 DOI: 10.1016/j.ahj.2015.05.014] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Accepted: 05/25/2015] [Indexed: 12/14/2022]
Abstract
Autonomic dysfunction represents a loss of normal autonomic control of the cardiovascular system associated with both sympathetic nervous system overdrive and reduced efficacy of the parasympathetic nervous system. Autonomic dysfunction is a strong predictor of future coronary heart disease, vascular disease, and sudden cardiac death. In the current review, we will discuss the clinical importance of autonomic dysfunction as a cardiovascular risk marker among breast cancer patients. We will review the effects of antineoplastic therapy on autonomic function, as well as discuss secondary exposures, such as psychological stress, sleep disturbances, weight gain/metabolic derangements, and loss of cardiorespiratory fitness, which may negatively impact autonomic function in breast cancer patients. Lastly, we review potential strategies to improve autonomic function in this population. The perspective can help guide new therapeutic interventions to promote longevity and cardiovascular health among breast cancer survivors.
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3
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Garg M, Singhal T, Sharma H. Cardioprotective effect of ammonium glycyrrhizinate against doxorubicin-induced cardiomyopathy in experimental animals. Indian J Pharmacol 2014; 46:527-30. [PMID: 25298583 PMCID: PMC4175890 DOI: 10.4103/0253-7613.140585] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 05/29/2014] [Accepted: 07/24/2014] [Indexed: 11/30/2022] Open
Abstract
Objective: The objective of this study was to evaluate the cardioprotective effect of herbal bioactive compound ammonium glycyrrhizinate against doxorubicin-induced cardiomyopathy, in experimental animals. Materials and Methods: Ammonium glycyrrhizinate (50, 100, 200 mg/kg, p.o.) was administered for four weeks in albino rats. Cardiomyopathy was induced with a dose of 2.5 mg/kg i.p. of doxorubicin on 1th, 7th, 14th, 21th, 28th day in the experimental animals. At the end of the experiment, on 29th day, serum and heart tissues were collected and hemodynamic, biochemical and histopathological studies were carried out. Results: Administration of doxorubicin in normal rats showed significant (P < 0.001) changes in body weight, feed intake, urine output, hemodynamic parameters like (blood pressure, heart rate, cardiac output) and in lipid profile (cholesterol, triglyceride, high density lipoprotein, low density lipoprotein, very low density lipoprotein) indicating cardiomyopathy symptoms. Animals treated with ammonium glycyrrhizinate significantly (P < 0.05) decreased triglyceride, cholesterol, low density lipoprotein (LDL) and very low density lipoprotein (VLDL) levels. Moreover, high density lipoprotein (HDL) levels increased in rats treated with ammonium glycyrrhizinate as compared with the normal group. Conclusion: Ammonium glycyrrhizinate is effective in controlling serum lipid profile and cardiac complications in experimentally induced cardiomyopathy in animals.
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Affiliation(s)
- Munish Garg
- Department of Pharmaceutical Sciences, Maharshi Dayanand University, Rohtak, Haryana, India
| | - Tinku Singhal
- Department of Pharmaceutical Sciences, Maharshi Dayanand University, Rohtak, Haryana, India
| | - Hitender Sharma
- Department of Pharmaceutical Sciences, Maharshi Dayanand University, Rohtak, Haryana, India
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4
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Gziri MM, Pokreisz P, De Vos R, Verbeken E, Debiève F, Mertens L, Janssens SP, Amant F. Fetal Rat Hearts Do Not Display Acute Cardiotoxicity in Response to Maternal Doxorubicin Treatment. J Pharmacol Exp Ther 2013; 346:362-9. [DOI: 10.1124/jpet.113.205419] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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5
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Soltysinska E, Thiele S, Olesen SP, Osadchii OE. Chronic sympathetic activation promotes downregulation of β-adrenoceptor-mediated effects in the guinea pig heart independently of structural remodeling and systolic dysfunction. Pflugers Arch 2011; 462:529-43. [PMID: 21811789 DOI: 10.1007/s00424-011-1005-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Revised: 07/25/2011] [Accepted: 07/25/2011] [Indexed: 11/26/2022]
Abstract
It is uncertain if downregulation of β-adrenoceptor signaling pathway is promoted by an enhanced adrenergic tone at an early stage of cardiac disease, or it develops secondary to detrimental local myocardial changes in advanced heart failure. We examined the integrity of β-adrenoceptor signaling pathway upon chronic infusion of isoproterenol, a β-adrenoceptor agonist, at a dose producing no structural left ventricular (LV) remodeling and systolic dysfunction. Subcutaneous isoproterenol infusion (400 μg kg(-1) h(-1) over 16 days) to guinea pigs using osmotic minipumps produced no change in cardiac weights, LV internal dimensions, myocyte cross-sectional area, extent of interstitial fibrosis, and basal contractile function. Isolated, perfused heart preparations from isoproterenol-treated guinea pigs exhibited attenuated responsiveness to acute β-adrenoceptor stimulation, as evidenced by reduced LV developed pressure increase, less shortening of LV epicardial monophasic action potential and effective refractory period, and less myocardial cyclic adenosine monophosphate elevation, in response to isoproterenol exposure, when compared to saline-treated controls. Pharmacological responses to forskolin, an activator of the adenylate cyclase catalytic subunit, were well preserved in isoproterenol-treated hearts. Downregulation of β-adrenoceptor-mediated effects upon chronic isoproterenol infusion was associated with markedly reduced stimulatory G-protein α-subunit (G(sα)) myocardial expression levels. No change in expression levels of β-adrenoceptors, G-protein-coupled receptor kinase 2, inhibitory G-protein α-subunit (G(iα2)), and Ca(v)1.2 and K(v)7.1 ion channels was determined in isoproterenol-treated hearts. We therefore conclude that sustained adrenergic overstimulation may promote downregulation of myocardial β-adrenoceptor-mediated effects independently of structural LV remodeling and systolic failure, an effect attributed to β-adrenoceptor uncoupling from adenylate cyclase due to reduced G(sα)-protein expression.
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Affiliation(s)
- Ewa Soltysinska
- The Danish National Research Foundation Centre for Cardiac Arrhythmia, Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3, 2200, Copenhagen N, Denmark
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6
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Rahimi_Balaei M, Momeny M, Babaeikelishomi R, Ejtemaei Mehr S, Tavangar SM, Dehpour AR. The modulatory effect of lithium on doxorubicin-induced cardiotoxicity in rat. Eur J Pharmacol 2010; 641:193-8. [DOI: 10.1016/j.ejphar.2010.05.046] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2010] [Revised: 04/26/2010] [Accepted: 05/25/2010] [Indexed: 11/25/2022]
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7
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Kenk M, Thackeray JT, Thorn SL, Dhami K, Chow BJ, Ascah KJ, DaSilva JN, Beanlands RS. Alterations of pre- and postsynaptic noradrenergic signaling in a rat model of adriamycin-induced cardiotoxicity. J Nucl Cardiol 2010; 17:254-63. [PMID: 20182926 DOI: 10.1007/s12350-009-9190-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2009] [Accepted: 12/19/2009] [Indexed: 01/08/2023]
Abstract
BACKGROUND Altered sympathetic nervous system signaling is known to play a role in the cardiotoxicity of the anthracycline chemotherapeutic agents, but the interaction of pre- and postsynaptic function is not well understood. METHODS AND RESULTS Our aim was to study the noradrenergic signaling in an established rat model of adriamycin cardiotoxicity (15 mg/kg administered i.p. over 2 weeks) using radiotracers having potential applicability for imaging with positron emission tomography (PET). Ex vivo biodistribution was performed 1 and 3 weeks post-adriamycin treatment with the noradrenaline analogue [(11)C]meta-hydroxyephedrine ([(11)C]HED), beta-adrenergic receptor antagonist [(3)H]CGP12177, and phosphodiesterase-4 inhibitor (R)-[(11)C]rolipram. Cardiac function (echocardiographic parameters) and heart/body weight ratio were not affected. Myocardial retention of [(11)C]HED, [(3)H]CGP12177, and (R)-[(11)C]rolipram were unchanged 1 week post-adriamycin. Compared to controls, 3 weeks post-treatment [(3)H]CGP12177 uptake decreased (left ventricle free wall and septum; P < 0.05), while [(11)C]HED and (R)-[(11)C]rolipram uptake were unaffected. Following acute increase in myocardial noradrenaline levels with desipramine treatment, (R)-[(11)C]rolipram retention increased in the left atrium, right ventricle, left ventricle free wall and septum (P < 0.05) in vehicle-, but not adriamycin-treated animals. CONCLUSION Our results suggest that adriamycin-induced toxicity exhibits no change in presynaptic noradrenaline uptake, but decreased beta-adrenergic receptors in cardiac tissues, supporting a role for PET imaging of noradrenaline signaling in the study of anthracycline cardiotoxicity.
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Affiliation(s)
- Miran Kenk
- National Cardiac PET Centre, Division of Cardiology (Department of Medicine), University of Ottawa Heart Institute, 40 Ruskin St., Ottawa, ON, K1Y 4W7, Canada
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8
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Hazari MS, Haykal-Coates N, Winsett DW, Costa DL, Farraj AK. Continuous Electrocardiogram Reveals Differences in the Short-Term Cardiotoxic Response of Wistar-Kyoto and Spontaneously Hypertensive Rats to Doxorubicin. Toxicol Sci 2009; 110:224-34. [DOI: 10.1093/toxsci/kfp092] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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9
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Kelishomi RB, Ejtemaeemehr S, Tavangar SM, Rahimian R, Mobarakeh JI, Dehpour AR. Morphine is protective against doxorubicin-induced cardiotoxicity in rat. Toxicology 2008; 243:96-104. [DOI: 10.1016/j.tox.2007.09.026] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2007] [Revised: 09/23/2007] [Accepted: 09/24/2007] [Indexed: 10/22/2022]
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10
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Neilan TG, Blake SL, Ichinose F, Raher MJ, Buys ES, Jassal DS, Furutani E, Perez-Sanz TM, Graveline A, Janssens SP, Picard MH, Scherrer-Crosbie M, Bloch KD. Disruption of nitric oxide synthase 3 protects against the cardiac injury, dysfunction, and mortality induced by doxorubicin. Circulation 2007; 116:506-14. [PMID: 17638931 DOI: 10.1161/circulationaha.106.652339] [Citation(s) in RCA: 124] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Flavoprotein reductases are involved in the generation of reactive oxygen species by doxorubicin. The objective of the present study was to determine whether or not one flavoprotein reductase, endothelial nitric oxide synthase (nitric oxide synthase 3 [NOS3]), contributes to the cardiac dysfunction and injury seen after the administration of doxorubicin. METHODS AND RESULTS A single dose of doxorubicin (20 mg/kg) was administered to wild-type (WT) mice, NOS3-deficient mice (NOS3-/-), and mice with cardiomyocyte-specific overexpression of NOS3 (NOS3-TG). Cardiac function was assessed after 5 days with the use of echocardiography. Doxorubicin decreased left ventricular fractional shortening from 57+/-2% to 47+/-1% (P<0.001) in WT mice. Compared with WT mice, fractional shortening was greater in NOS3-/- and less in NOS3-TG after doxorubicin (55+/-1% and 35+/-2%; P<0.001 for both). Cardiac tissue was harvested from additional mice at 24 hours after doxorubicin administration for measurement of cell death and reactive oxygen species production. Doxorubicin induced cardiac cell death and reactive oxygen species production in WT mice, effects that were attenuated in NOS3-/- and were more marked in NOS3-TG mice. Finally, WT and NOS3-/- mice were treated with a lower dose of doxorubicin (4 mg/kg) administered weekly over 5 weeks. Sixteen weeks after beginning doxorubicin treatment, fractional shortening was greater in NOS3-/- than in WT mice (45+/-2% versus 28+/-1%; P<0.001), and mortality was reduced (7% versus 60%; P<0.001). CONCLUSIONS These findings implicate NOS3 as a key mediator in the development of left ventricular dysfunction after administration of doxorubicin.
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MESH Headings
- Animals
- Apoptosis/drug effects
- Cardiac Catheterization
- Doxorubicin/metabolism
- Doxorubicin/toxicity
- Female
- Gene Expression Regulation/drug effects
- Luminescent Measurements
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Transgenic
- Myocardium/enzymology
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/pathology
- NG-Nitroarginine Methyl Ester/pharmacology
- Nitric Oxide/physiology
- Nitric Oxide Synthase Type II/antagonists & inhibitors
- Nitric Oxide Synthase Type II/deficiency
- Nitric Oxide Synthase Type II/genetics
- Nitric Oxide Synthase Type II/physiology
- Nitric Oxide Synthase Type III
- Oxidative Stress
- Reactive Oxygen Species/metabolism
- Recombinant Fusion Proteins/physiology
- Superoxides/metabolism
- Ultrasonography
- Ventricular Dysfunction, Left/chemically induced
- Ventricular Dysfunction, Left/diagnostic imaging
- Ventricular Dysfunction, Left/enzymology
- Ventricular Dysfunction, Left/pathology
- Ventricular Dysfunction, Left/prevention & control
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Affiliation(s)
- Tomas G Neilan
- Cardiovascular Research Center, Division of Cardiology, Massachusetts General Hospital, Charlestown, MA, USA.
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11
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Nomura Y, Matsunari I, Takamatsu H, Murakami Y, Matsuya T, Taki J, Nakajima K, Nekolla SG, Chen WP, Kajinami K. Quantitation of cardiac sympathetic innervation in rabbits using 11C-hydroxyephedrine PET: relation to 123I-MIBG uptake. Eur J Nucl Med Mol Imaging 2006; 33:871-8. [PMID: 16721572 DOI: 10.1007/s00259-006-0105-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2005] [Accepted: 02/07/2006] [Indexed: 11/25/2022]
Abstract
PURPOSE Although (11)C-hydroxyephedrine ((11)C-HED) PET is used to map cardiac sympathetic innervation, no studies have shown the feasibility of quantitation of (11)C-HED PET in small- to medium-sized animals. Furthermore, its relation to (123)I-MIBG uptake, the most widely used sympathetic nervous tracer, is unknown. The aims of this study were to establish in vivo sympathetic nerve imaging in rabbits using (11)C-HED PET, and to compare the retention of (11)C-HED with that of (123)I-MIBG. METHODS Twelve rabbits were assigned to three groups; control (n=4), chemical denervation by 6-hydroxydopamine (6-OHDA) (n=4) and reserpine treated to inhibit vesicular uptake (n=4). After simultaneous injection of (11)C-HED and (123)I-MIBG, all animals underwent dynamic (11)C-HED PET for 40 min with arterial blood sampling. The (11)C-HED retention fraction and normalised (11)C-HED activity measured by tissue sampling were compared with those measured by PET. RESULTS Both the (11)C-HED retention fraction and the normalised (11)C-HED activity measured by PET correlated closely with those measured by tissue sampling (R=0.96027, p<0.001 and R=0.97282, p<0.001, respectively). Inhibition study by 6-OHDA resulted in a significant reduction in retention (90%) for both (11)C-HED and (123)I-MIBG. Reserpine pretreatment reduced (11)C-HED retention by 50%, but did not reduce (123)I-MIBG retention at 40 min after injection. CONCLUSION Non-invasive quantitation of cardiac sympathetic innervation using (11)C-HED PET is feasible and gives reliable estimates of cardiac sympathetic innervation in rabbits. Additionally, although both (11)C-HED and (123)I-MIBG are specific for sympathetic neurons, (11)C-HED may be more specific for intravesicular uptake than (123)I-MIBG in some situations, such as that seen in reserpine pretreatment.
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Affiliation(s)
- Yusuke Nomura
- Department of Cardiology, Kanazawa Medical University, Ishikawa, Japan
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12
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Plante E, Lachance D, Gaudreau M, Drolet MC, Roussel E, Arsenault M, Couet J. Effectiveness of β-Blockade in Experimental Chronic Aortic Regurgitation. Circulation 2004; 110:1477-83. [PMID: 15353507 DOI: 10.1161/01.cir.0000141733.55236.9d] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Past studies have suggested that the adrenergic system becomes abnormally activated in chronic volume overload, such as in severe aortic valve regurgitation (AR). However, the effectiveness of agents directed against this adrenergic activation has never been adequately tested in chronic AR. We therefore tested the effects of metoprolol treatment on the left ventricular (LV) function and remodeling in severe chronic AR in rats. METHODS AND RESULTS Severe AR was created in adult male Wistar rats by retrograde puncture of the aortic leaflets under echocardiographic guidance. Two weeks later, some animals received metoprolol treatment (25 mg/kg) orally for 24 weeks, and some were left untreated. LV dimensions, ejection fraction, and filling parameters were evaluated by echocardiography. Hearts were harvested at 1, 2, 14, and 180 days for the evaluation of hypertrophy, beta-adrenergic receptor status, and extracellular matrix remodeling. We found that metoprolol treatment prevented LV dilatation and preserved the ejection fraction and filling parameters compared with untreated animals. Metoprolol increased the expression of beta1-adrenoreceptor mRNA and reduced G protein receptor kinase 2 levels. Collagen I and III mRNA levels were reduced. Cardiac myocyte hypertrophy was also prevented. CONCLUSIONS In our experimental model of severe AR, metoprolol treatment had a significant beneficial global effect on LV remodeling and function. These results suggest that the adrenergic system is important in the development of volume-overload cardiomyopathy in AR and that adrenergic-blocking agents may play a role in the treatment of this disease.
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MESH Headings
- Adrenergic beta-Antagonists/therapeutic use
- Animals
- Aortic Valve Insufficiency/diagnostic imaging
- Aortic Valve Insufficiency/drug therapy
- Aortic Valve Insufficiency/genetics
- Aortic Valve Insufficiency/physiopathology
- Catecholamines/analysis
- Cell Size/drug effects
- Chronic Disease
- Drug Evaluation, Preclinical
- Fibronectins/analysis
- Heart Rate/drug effects
- Heart Ventricles/drug effects
- Heart Ventricles/pathology
- Hypertrophy, Left Ventricular/etiology
- Hypertrophy, Left Ventricular/prevention & control
- Male
- Metoprolol/pharmacology
- Metoprolol/therapeutic use
- Myocytes, Cardiac/chemistry
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/ultrastructure
- Organ Size
- RNA, Messenger/biosynthesis
- Rats
- Rats, Wistar
- Receptors, Adrenergic, beta-1/biosynthesis
- Receptors, Adrenergic, beta-1/genetics
- Stroke Volume
- Ultrasonography
- Up-Regulation/drug effects
- Ventricular Remodeling/drug effects
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Affiliation(s)
- Eric Plante
- Groupe de Recherche sur les Valvulopathies, Centre de Recherche Hôpital Laval, Institut de Cardiologie de Québec, Université Laval, Quebec, Canada
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13
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Plante E, Couet J, Gaudreau M, Dumas MP, Drolet MC, Arsenault M. Left ventricular response to sustained volume overload from chronic aortic valve regurgitation in rats. J Card Fail 2003; 9:128-40. [PMID: 12751134 DOI: 10.1054/jcaf.2003.17] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVES Aortic regurgitation (AR) induces left ventricular (LV) eccentric hypertrophy in response to chronic volume overload. Patients suffering from this disease often remain asymptomatic for decades before progressive LV dysfunction develops silently. Because of this slow evolution, large clinical trials with long-term follow-up on subjects with chronic AR are hard to perform. To overcome this problem, animal models have been developed in the past but results were very heterogeneous. METHODS Helped by echocardiography, we refined a known technique to induce homogeneous degrees of severe AR in Wistar-Kyoto rats. The effects on LV function without treatment and with nifedipine (25 mg/kg daily) (a drug currently recommended in humans with chronic AR) were evaluated by echocardiography. RESULTS Over 6 months, nontreated animals developed progressive LV dilatation and eccentric hypertrophy, characteristic of chronic LV volume overload. The animals also developed progressive LV systolic dysfunction, mimicking closely the evolution of the disease in humans. Abnormal filling parameters were also detected in the majority of animals. Systolic and diastolic abnormalities were prevented but only partially in the group treated with nifedipine. CONCLUSION This model can be used to study chronic AR and LV dysfunction associated with the disease. Nifedipine seems to protect the LV against chronic volume overload but only partially. Treatment strategies currently used in humans deserve further investigation.
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Affiliation(s)
- Eric Plante
- Centre de Recherche Hôpital Laval, Institut de Cardiologie de Québec, Université Laval, Quebec City, Canada
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14
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Liang CS, Himura Y, Kashiki M, Stevens SY. Differential pre- and postsynaptic effects of desipramine on cardiac sympathetic nerve terminals in RHF. Am J Physiol Heart Circ Physiol 2002; 283:H1863-72. [PMID: 12384464 DOI: 10.1152/ajpheart.01131.2001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Right heart failure (RHF) is characterized by chamber-specific reductions of myocardial norepinephrine (NE) reuptake, beta-receptor density, and profiles of cardiac sympathetic nerve ending neurotransmitters. To study the functional linkage between NE uptake and the pre- and postsynaptic changes, we administered desipramine (225 mg/day), a NE uptake inhibitor, to dogs with RHF produced by tricuspid avulsion and progressive pulmonary constriction or sham-operated dogs for 6 wk. Animals receiving no desipramine were studied as controls. We measured myocardial NE uptake activity using [(3)H]NE, beta-receptor density by [(125)I]iodocyanopindolol, inotropic responses to dobutamine, and noradrenergic terminal neurotransmitter profiles by glyoxylic acid-induced histofluorescence for catecholamines, and immunocytochemical staining for tyrosine hydroxylase and neuropeptide Y. Desipramine decreased myocardial NE uptake activity and had no effect on the resting hemodynamics in both RHF and sham animals but decreased myocardial beta-adrenoceptor density and beta-adrenergic inotropic responses in both ventricles of the RHF animals. However, desipramine treatment prevented the reduction of sympathetic neurotransmitter profiles in the failing heart. Our results indicate that NE uptake inhibition facilitates the reduction of myocardial beta-adrenoceptor density and beta-adrenergic subsensitivity in RHF, probably by increasing interstitial NE concentrations, but protects the cardiac noradrenergic nerve endings from damage, probably via blockade of NE-derived neurotoxic metabolites into the nerve endings.
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Affiliation(s)
- Chang-Seng Liang
- Cardiology Unit, Department of Medicine, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, NY 14642, USA.
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15
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Kawamura A, Yoshikawa T, Takahashi T, Hayashi T, Takahashi E, Anzai T, Sato T, Ogawa S. Randomized trial of phosphodiesterase inhibitors versus catecholamines in patients with acutely decompensated heart failure. JAPANESE CIRCULATION JOURNAL 2001; 65:858-62. [PMID: 11665788 DOI: 10.1253/jcj.65.858] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Increased neurohormone and cytokine concentrations are associated with adverse outcome in patients with congestive heart failure, so minimizing these increases may improve outcome, even in the acute phase of decompensated heart failure. The present study was designed to test the hypothesis that phosphodiesterase inhibitors, but not catecholamines, could favorably affect neurohormone and cytokine profiles in patients with acutely decompensated heart failure. Twenty-nine patients underwent monitoring using a Swan-Ganz catheter and were randomly allocated to receive phosphodiesterase inhibitors (PDEI group, n=19) or catecholamines (CA group, n=10). Pulmonary capillary wedge pressure decreased significantly in both groups and cardiac output showed a slight, but not statistically significant increase, in both groups. There was a significant decrease in plasma brain natriuretic peptide concentration in the PDEI group, but not in the CA group, whereas plasma interleukin-6 concentration increased in the CA group, but not in the PDEI group. Phosphodiesterase inhibitors favorably affect neurohormone and cytokine concentrations in patients with acutely decompensated heart failure.
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Affiliation(s)
- A Kawamura
- Department of Medicine, Keio University School of Medicine, Tokyo, Japan
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16
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Kawada T, Yamazaki T, Akiyama T, Sato T, Shishido T, Sugimachi M, Sunagawa K. Chronic adriamycin treatment impairs myocardial interstitial neuronal release of norepinephrine and epinephrine. J Cardiovasc Pharmacol 2001; 36 Suppl 2:S31-4. [PMID: 11206717 DOI: 10.1097/00005344-200000006-00008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Although chronic adriamycin (doxorubicin) treatment is known to induce cardiomyopathic heart failure with sympathetic neurohumoral activation in a dose-dependent manner, its effect on local neuronal catecholamine release at the cardiac sympathetic nerve terminals remains to be clearly determined. Using a cardiac microdialysis technique, we measured dialysate norepinephrine (NE) and epinephrine (Epi) concentrations as indices of myocardial interstitial NE and Epi levels. respectively, in rabbits with chronic adriamycin treatment (ADR) (4 mg/kg/week, 6 weeks, n = 8) and in control rabbits (CNT) (n = 6). Exocytotic release was evoked by the local administration of KCl (100 mM) through the dialysis probe. Basal levels of NE and Epi did not differ between the ADR and CNT groups (NE, 11.6 +/- 6.6 vs. 20.4 +/- 17.2 pg/ml; Epi, 4.0 +/- 0.1 vs. 4.6 +/- 1.7 pg/ml: mean +/- SD). The exocytotic release was suppressed in the ADR compared with the CNT group (NE, 191.4 +/- 144.7 vs. 760.5 +/- 337.8 pg/ml; p < 0.05: Epi, 4.2 +/- 0.4 vs. 20.8 +/- 9.9 pg/ml; p < 0.05). We conclude that chronic adriamycin treatment impairs the neuronal exocytotic release of catecholamine at the cardiac sympathetic nerve terminals.
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Affiliation(s)
- T Kawada
- Department of Cardiovascular Dynamics, National Cardiovascular Center Research Institute, Suita, Osaka, Japan.
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Leineweber K, Seyfarth T, Brodde OE. Chamber-specific alterations of noradrenaline uptake (uptake(1)) in right ventricles of monocrotaline-treated rats. Br J Pharmacol 2000; 131:1438-44. [PMID: 11090118 PMCID: PMC1572457 DOI: 10.1038/sj.bjp.0703698] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2000] [Revised: 08/18/2000] [Accepted: 09/13/2000] [Indexed: 01/08/2023] Open
Abstract
1. In rats a single injection of the alkaloid monocrotaline (60 mg MCT kg(-1) body weight, i.p.) caused right ventricular hypertrophy and heart failure. The aim of this study was to find out whether, in these MCT-treated rats, the cardiac neuronal noradrenaline uptake (uptake(1)) might undergo chamber-specific alterations. 2. For this purpose we assessed in right and left ventricular slices, uptake(1) activity (by [(3)H]-noradrenaline accumulation), and in right and left ventricular membranes, uptake(1) carrier protein density (by [(3)H]-nisoxetine binding). 3. Uptake(1)-inhibitors blocked [(3)H]-noradrenaline accumulation in ventricular slices and [(3)H]-nisoxetine binding in ventricular membranes with the order of potency: desipramine > nisoxetine >> cocaine > or = GBR 12909, indicating that with both approaches noradrenaline uptake(1) was determined. 4. In right ventricular slices of MCT-treated rats uptake(1) activity was significantly lower than in control rats (84.7+/-8.2 vs 145.1+/-6.2 pmol noradrenaline mg(-1) tissue 15 min(-1); P<0.05). This was accompanied by a significant decrease in the density of [(3)H]-nisoxetine binding sites (73.7+/-14.4 vs 125.9+/-9.1 fmol mg(-1) protein; P:<0.05). 5. In left ventricular slices of MCT-treated rats uptake(1) activity was not significantly altered (131.2+/-10.5 vs 116.1+/-5.2 pmol noradrenaline mg(-1) tissue 15 min(-1)); similarly, also the density of [(3)H]-nisoxetine binding sites was unchanged (108+/-9.7 vs 123+/-7.7 fmol mg(-1) protein). 6. We conclude that in MCT-treated rats with right ventricular hypertrophy and heart failure uptake(1) activity is chamber-specifically reduced possibly due to a decrease in carrier protein density.
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Affiliation(s)
- K Leineweber
- Institute of Pharmacology and Toxicology, University of Halle-Wittenberg, Halle/Saale, Germany
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18
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Wang X, Dhalla NS. Modification of beta-adrenoceptor signal transduction pathway by genetic manipulation and heart failure. Mol Cell Biochem 2000; 214:131-55. [PMID: 11195784 DOI: 10.1023/a:1007131925048] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The beta-adrenoceptor (beta-AR) mediated signal transduction pathway in cardiomyocytes is known to involve beta1- and beta2-ARs, stimulatory (Gs) and inhibitory (Gi) guanine nucleotide binding proteins, adenylyl cyclase (AC) and cAMP-dependent protein kinase (PKA). The activation of beta1- and beta2-ARs has been shown to increase heart function by increasing Ca2+ -movements across the sarcolemmal membrane and sarcoplasmic reticulum through the stimulation of Gs-proteins, activation of AC and PKA enzymes and phosphorylation of the target sites. The activation of PKA has also been reported to increase phosphorylation of some myofibrillar proteins (for promoting cardiac relaxation) and nuclear proteins (for cardiac hypertrophy). The activation of beta2-AR has also been shown to affect Gi-proteins, stimulate mitogen activated protein kinase and increase protein synthesis by enhancing gene expression. Beta1- and beta2-ARs as well as AC are considered to be regulated by PKA- and protein kinase C (PKC)-mediated phosphorylations directly; both PKA and PKC also regulate beta-AR indirectly through the involvement of beta-AR kinase (betaARK), beta-arrestins and Gbeta gamma-protein subunits. Genetic manipulation of different components and regulators of beta-AR signal transduction pathway by employing transgenic and knockout mouse models has provided insight into their functional and regulatory characteristics in cardiomyocytes. The genetic studies have also helped in understanding the pathophysiological role of PARK in heart dysfunction and therapeutic role of betaARK inhibitors in the treatment of heart failure. Varying degrees of defects in the beta-AR signal transduction system have been identified in different types of heart failure to explain the attenuated response of the failing heart to sympathetic stimulation or catecholamine infusion. A decrease in beta1-AR density, an increase in the level of G1-proteins and overexpression of betaARK are usually associated with heart failure; however, these attenuations have been shown to be dependent upon the type and stage of heart failure as well as region of the heart. Both local and circulating renin-angiotensin systems, sympathetic nervous system and endothelial cell function appears to regulate the status of beta-AR signal transduction pathway in the failing heart. Thus different components and regulators of the beta-AR signal transduction pathway appears to represent important targets for the development of therapeutic interventions for the treatment of heart failure.
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Affiliation(s)
- X Wang
- Institute of Cardiovascular Sciences, Department of Physiology, Faculty of Medicine University of Manitoba, Winnipeg, Canada
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White LT, O'Donnell JM, Griffin J, Lewandowski ED. Cytosolic redox state mediates postischemic response to pyruvate dehydrogenase stimulation. THE AMERICAN JOURNAL OF PHYSIOLOGY 1999; 277:H626-34. [PMID: 10444488 DOI: 10.1152/ajpheart.1999.277.2.h626] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Augmented pyruvate oxidation via pharmacological stimulation of pyruvate dehydrogenase (PDH) during reperfusion has been related to improved recovery of postischemic hearts independent of glycolytic activity. This study examined recovery of postischemic rabbit hearts during activation of PDH with dichloroacetate (DCA) in the presence of lactate, as a source of pyruvate, to determine the response to substrate-dependent changes in cytosolic redox state. After 10 min of ischemia, isolated hearts were reperfused with either 2.5 mM or 0. 5 mM pyruvate (Pyr) or 2.5 mM lactate (Lac), with or without 5 mM DCA. (13)C-enriched substrates allowed NMR assessment of metabolic perturbations. During normal perfusion, Pyr and Lac supported similar mechanical work. Increasing Pyr oxidation restored postischemic rate-pressure product to 82 +/- 4 and 88 +/- 6% of preischemic values during reperfusion with 2.5 and 0.5 mM Pyr, respectively, vs. 61 +/- 6 and 45 +/- 14% for untreated 2.5 and 0.5 mM Pyr, respectively (P < 0.05). In contrast, increasing Lac oxidation did not benefit recovery of RPP in untreated (44 +/- 7%) vs. DCA-treated 36 +/- 4% hearts. Thus the benefit of PDH activation for contractile recovery of postischemic hearts is mediated by the source of pyruvate, which also influences cytosolic redox state.
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Affiliation(s)
- L T White
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02129, USA
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20
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Baba A, Yoshikawa T, Mitamura H, Ogawa S. Erythrocyte Na+, K+-ATPase activity in patients with congestive heart failure. Int J Cardiol 1999; 69:117-25. [PMID: 10549834 DOI: 10.1016/s0167-5273(99)00037-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In order to determine if the Na+, K+-ATPase activity in erythrocyte membranes is altered in congestive heart failure, and to examine its clinical significance with respect to other clinical variables, erythrocyte Na+, K+-ATPase activity was measured in 51 patients with left ventricular ejection fractions <40% (coronary artery disease, n=26; dilated cardiomyopathy, n=25) and 24 control patients. Na+, K+-ATPase activity was lower in both coronary artery disease and dilated cardiomyopathy groups than control group even in the absence of digitalis use. There was a significant inverse correlation between Na+, K+-ATPase activity and plasma norepinephrine. The presence of non-sustained ventricular tachycardia was associated with a lower Na+, K+-ATPase activity in both groups with congestive heart failure without digitalis use than those without ventricular tachycardia. Plasma norepinephrine was higher in patients with non-sustained ventricular tachycardia than those without in the coronary artery disease group, but not in the dilated cardiomyopathy group. Na+, K+-ATPase activity may be helpful in predicting electrophysiologic instability in patients with heart failure.
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Affiliation(s)
- A Baba
- Cardiopulmonary Division, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
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21
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Baba A, Yoshikawa T, Nakamura I, Iwata M, Wainai Y, Ogawa S. Isoform-specific alterations in cardiac and erythrocyte Na+,K+-ATPase activity induced by norepinephrine. J Card Fail 1998; 4:333-41. [PMID: 9924855 DOI: 10.1016/s1071-9164(98)90239-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Myocardial Na+,K+-ATPase activities are decreased in congestive heart failure because of an increase in plasma norepinephrine levels, but it is difficult to monitor the activities in the clinical setting. METHODS AND RESULTS This study investigated whether erythrocyte Na+,K+-ATPase activity can reflect myocardial enzyme activity and whether isoform-specific alterations occur in the presence of catecholamine. Na+,K+-ATPase activity was measured by the colorimetric method by using the left ventricular myocardium and erythrocytes prepared from eight rabbits given norepinephrine for 7 days and from eight control rabbits that received saline. The protein levels of total catalytic subunit and alpha1- or alpha3-isoform of Na+,K+-ATPase were determined by Western blot analysis. Na+,K+-ATPase activity was lower in both myocardium and erythrocytes from norepinephrine-treated rabbits than control rabbits (P < .01 and P < .01, respectively). There was a close correlation in Na+,K+-ATPase activity between myocardium and erythrocytes (r = .963). Total catalytic subunit protein level was lower in myocardium from norepinephrine-treated rabbits than control rabbits, but the alpha1-isoform level was similar between the two groups. The alpha3-isoform level was lower in norepinephrine-treated rabbits than control rabbits. In erythrocytes, alpha1-isoform was lower in norepinephrine-treated rabbits than control rabbits. CONCLUSIONS Na+,K+-ATPase activity in myocardium could be reflected in erythrocyte membrane, although there was a difference in isoform-specific regulation between the two.
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Affiliation(s)
- A Baba
- Department of Medicine, Keio University School of Medicine, Tokyo, Japan
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22
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Böhm M, Castellano M, Flesch M, Maack C, Moll M, Paul M, Schiffer F, Zolk O. Chamber-specific alterations of norepinephrine uptake sites in cardiac hypertrophy. Hypertension 1998; 32:831-7. [PMID: 9822440 DOI: 10.1161/01.hyp.32.5.831] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The present study investigated local differences of sympathetic activation and sympathetic neuroeffector defects in nonhypertrophied right and hypertrophied left ventricles in a rat model with renin-induced pressure overload [TG(mREN2)27]. As judged from the depletion of myocardial norepinephrine stores, sympathetic activation was more pronounced in the left than in the right ventricles. In addition, norepinephrine uptake1 carrier sites were reduced in left but unchanged in right ventricles. Gene expression of the carrier was unchanged in stellate ganglia. An increase of Gialpha expression and a heterologous adenylyl cyclase desensitization occurred only in the left but not in the right ventricles, whereas a reduction of beta-adrenergic receptors was observed in both chambers. We concluded that general sympathetic activation can lead to beta-adrenoceptor downregulation but that pressure overload further increases sympathetic activation involving norepinephrine uptake mechanisms in the left ventricles, resulting in heterologous beta-adrenergic desensitization.
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Affiliation(s)
- M Böhm
- Klinik III für Innere Medizin der Universität zu Köln, Köln, and the Institut für Klinische Pharmakologie und Toxikologie der Freien Universität Berlin, Germany
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23
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Anzai T, Lai NC, Gao M, Hammond HK. Dissociation between regional dysfunction and beta-adrenergic receptor signaling in heart failure. THE AMERICAN JOURNAL OF PHYSIOLOGY 1998; 275:H1267-73. [PMID: 9746475 DOI: 10.1152/ajpheart.1998.275.4.h1267] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We have previously shown that left ventricular (LV) pacing-induced heart failure is associated with preserved wall thickening in the interventricular septum (IVS) compared with the posterolateral wall (PLW). The current study focuses on the relationship between regional myocardial function and altered beta-adrenergic receptor (beta-AR) signaling. We studied 15 pigs: 6 controls and 9 paced from the left ventricle (225 beats/min, 26 +/- 3 days). Heart failure was documented by decreased LV fractional shortening (P < 0.0001) and increased left atrial pressure (P < 0.0001). In heart failure, despite marked differences in basal regional function (percent wall thickening: IVS, 33 +/- 10% vs. PLW, 13 +/- 7%; P = 0.0003), there were no differences between the two regions in beta-AR responsiveness, measured by regional wall thickening in response to dobutamine infusion and any measurement of adrenergic signaling. Adenylyl cyclase activity, beta-AR number, and beta-AR/Gs coupling were markedly reduced in failing LV without regional differences. In animals with heart failure, LV G protein receptor kinase (GRK) isoform 2 content was unchanged and GRK5, the other major GRK isoform, was increased more than threefold (IVS, 0.51 +/- 0.20 vs. 0. 12 +/- 0.12 arbitrary densitometric units, P = 0.01; PLW, 0.47 +/- 0. 15 vs. 0.13 +/- 0.09 arbitrary densitometric units, P = 0.03), but again, there were no regional differences. These data indicate that systemic rather than regional factors govern LV adrenergic signaling and that regional adrenergic signaling abnormalities poorly predict wall thickening in the same regions.
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Affiliation(s)
- T Anzai
- Veterans Affairs Medical Center-San Diego and Department of Medicine, University of California San Diego, La Jolla, California 92161, USA
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Nishimura H, Yoshikawa T, Anzai T, Baba A, Kobayashi N, Wainai Y, Ogawa S. Baroreceptor sensitivity during the compensatory phase of left ventricular overloading. JAPANESE CIRCULATION JOURNAL 1998; 62:773-8. [PMID: 9805261 DOI: 10.1253/jcj.62.773] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This study focused on the role of the baroreceptor-mediated control during the compensatory process after acute left ventricular overloading induced by aortic regurgitation (AR). Baroreceptor-heart rate sensitivity was measured using a phenylephrine-induced increase in blood pressure according to the steady state method before, 1 day, 1 week and 4 weeks after production of AR in 7 rabbits, and compared with 6 other rabbits that underwent a sham operation. Blood pressure was monitored noninvasively using Finapres in the unanesthetized state. Four weeks after the procedure, the left ventricular diameters of both end-diastole and end-systole were larger in the rabbits with AR than in the sham-operated rabbits. There was no difference in the left ventricular end-diastolic pressure or cardiac output. Left ventricular weight was higher in the rabbits with AR than in the sham-operated rabbits. Myocardial beta-adrenergic receptor density and norepinephrine content were comparable between the two groups. Baroreceptor-heart rate sensitivity significantly decreased 1 week after production of AR, and this alteration in sensitivity was partially restored 4 weeks after production of AR. These findings suggested that the altered baroreceptor-heart rate sensitivity was reversible, relating to the compensatory process after acute left ventricular overloading, and that these changes had some role in its pathophysiology.
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Affiliation(s)
- H Nishimura
- Department of Medicine, Keio University School of Medicine, Tokyo, Japan
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Nagami K, Yoshikawa T, Suzuki M, Wainai Y, Anzai T, Handa S. Abnormal beta-adrenergic transmembrane signaling in rabbits with adriamycin-induced cardiomyopathy. JAPANESE CIRCULATION JOURNAL 1997; 61:249-55. [PMID: 9152774 DOI: 10.1253/jcj.61.249] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We investigated alterations in the beta-adrenergic receptor-adenylate cyclase system in rabbits with congestive heart failure induced by adriamycin cardiotoxicity. A dose of 24 mg/kg adriamycin was administered over 16 weeks in 16 rabbits. Five of them died and 4 of them could not tolerate the full dose of adriamycin. Complete data were obtained in the remaining 7 rabbits. Another 7 rabbits received physiological saline for the same period and served as controls. Plasma norepinephrine concentration increased in adriamycin-treated rabbits, but not in the control rabbits. Cardiac output was lower in the adriamycin-treated group than in the control group. Both the left and right ventricular end-diastolic pressure were higher in the adriamycin-treated group. The density of myocardial beta-adrenergic receptors and the norepinephrine content were reduced in both ventricles in the adriamycin-treated group. Basal and isoproterenol-, sodium fluoride- and forskolin-stimulated adenylate cyclase activities were lower in the adriamycin-treated group. Thus, alterations in beta-adrenergic signaling occurred in both ventricles in animals with chronic biventricular failure induced by adriamycin. These may be the result of post-receptor abnormalities, including abnormalities of guanine nucleotide-binding proteins or of the catalytic unit of adenylate cyclase.
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Affiliation(s)
- K Nagami
- Department of Medicine, Keio University School of Medicine, Tokyo, Japan
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Nishimura H, Yoshikawa T, Kobayashi N, Anzai T, Nagami K, Handa S, Ogawa S. Effects of methylprednisolone on hemodynamics and beta-adrenergic receptor signaling in rabbits with acute left ventricular failure. Heart Vessels 1997; 12:84-91. [PMID: 9403312 DOI: 10.1007/bf02820871] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Studies suggest that corticosteroids may restore the responsiveness to catecholamines in hypotensive patients. Since the significance of this promising intervention in congestive heart failure remains to be explored, we determined the effects of methylprednisolone, a potent activator of beta-adrenergic receptor signaling, on hemodynamics and beta-adrenergic receptor regulation in an animal model of heart failure. Acute left ventricular overloading was produced by aortic regurgitation (AR) in 22 Japanese white rabbits. Eleven animals received an intravenous administration of methylprednisolone (AR + PSL), while 11 received saline (AR + C) for 1 week. A sham operation was performed on 10 other rabbits (S). There was no difference between the AR + C and AR + PSL groups in the decrease in aortic diastolic pressure immediately after the production of AR. The aortic diastolic pressure and regurgitant fractions were also similar in the two groups. The left ventricular end-diastolic and end-systolic dimensions were both larger, and the left ventricular end-diastolic pressure was higher in AR + C or AR + PSL than in S rabbits. Between the AR + C and AR + PSL, there were no differences in any of these variables. Cardiac output was lower in AR + C, but not in AR + PSL, than in S. Cardiac output in AR + PSL was significantly higher than in AR + C. The myocardial concentration of norepinephrine and the number of beta-adrenergic receptors were both lower in the AR + C and AR + PSL than in the S groups. The number of receptors in AR + PSL was higher than in AR + C. Maximal isoproterenol-stimulated adenylyl cyclase activity was similar in the AR + C and AR + PSL groups. Results suggest methylprednisolone yielded some benefits, including an increase in cardiac output and in total beta-adrenergic receptor number, in this animal model of heart failure.
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Affiliation(s)
- H Nishimura
- Department of Medicine, Keio University School of Medicine, Tokyo, Japan
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Anzai T, Yoshikawa T, Baba A, Nishimura H, Shiraki H, Nagami K, Suzuki M, Wainai Y, Ogawa S. Myocardial sympathetic denervation prevents chamber-specific alteration of beta-adrenergic transmembrane signaling in rabbits with heart failure. J Am Coll Cardiol 1996; 28:1314-22. [PMID: 8890832 DOI: 10.1016/s0735-1097(96)00305-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVES The purpose of this study was to assess the effect of myocardial sympathetic denervation on the chamber-specific alteration of beta-adrenergic signaling in left ventricular failure in rabbits. BACKGROUND Local abnormalities in sympathetic nerve terminals, including the neuronal reuptake of norepinephrine, are thought to be responsible for the chamber-specific regulation of beta-adrenergic signaling in heart failure. METHODS Sixteen rabbits were given 6-hydroxydopamine, 25 mg/kg body weight intravenously on days 1 and 2 and 50 mg/kg intravenously on days 7 and 8. Another 16 rabbits received vehicle. Aortic regurgitation was induced in eight of the 6-hydroxydopamine-treated and eight of the vehicle-treated rabbits on day 14. Another eight of the 6-hydroxydopamine-treated and eight of the vehicle-treated rabbits underwent a sham operation. The hearts were excised for biochemical analysis on day 21. RESULTS Hemodynamic characteristics on day 21 showed left ventricular failure in both the aortic regurgitation groups. The plasma norepinephrine concentration on day 21 was higher in both the aortic regurgitation groups than in the sham groups. The beta-adrenoceptor densities and isoproterenol plus 5'-guanylylimidodiphosphate-, 5'-guanylylimidodiphosphate- and sodium fluoride-stimulated adenylyl cyclase activities were decreased only in the failing left ventricle of the vehicle-pretreated aortic regurgitation group, but in both ventricles of the 6-hydroxydopamine-pretreated aortic regurgitation group. The basal and forskolin-stimulated adenylyl cyclase activities were similar in both the aortic regurgitation groups and in the sham groups. CONCLUSIONS Sympathetic denervation prevented chamber-specific alterations in beta-adrenergic signaling in acute left ventricular failure. Local loss of sympathetic nerve endings, and especially the defective neuronal norepinephrine reuptake, are likely to be responsible for the chamber-specific alteration of the beta-adrenoceptor-G protein-adenylyl cyclase system in heart failure in rabbits.
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Affiliation(s)
- T Anzai
- Department of Medicine, Keio University School of Medicine, Tokyo, Japan
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Engelhardt S, Böhm M, Erdmann E, Lohse MJ. Analysis of beta-adrenergic receptor mRNA levels in human ventricular biopsy specimens by quantitative polymerase chain reactions: progressive reduction of beta 1-adrenergic receptor mRNA in heart failure. J Am Coll Cardiol 1996; 27:146-54. [PMID: 8522688 DOI: 10.1016/0735-1097(95)00425-4] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
OBJECTIVES This study investigated the relation between the severity of heart failure and the extent of the reduction of beta 1-adrenergic receptor messenger ribonucleic acid (mRNA) levels in biopsy specimens from the ventricular septum obtained during cardiac catheterization of patients with various degrees of heart failure. BACKGROUND Heart failure is accompanied by desensitization of the beta-adrenergic receptor system, which is in part due to downregulation of beta 1-adrenergic receptors. Downregulation of beta 1-adrenergic receptors has been suggested to be caused by reductions in mRNA levels. METHODS Because biopsy specimens were small and receptor mRNAs not abundant, mRNA levels were determined by quantitative reverse transcription/polymerase chain reactions. This method was validated by measuring synthetic ribonucleic acid (RNA) standards and samples from explanted hearts by solution hybridization assays. Both methods yielded similar results, but the polymerase chain reaction method was approximately 1,000-fold more sensitive. Sources of variations in the polymerase chain reaction were quantitated and found to be best controlled for by determination of the glyceraldehyde phosphate dehydrogenase mRNA as an endogenous control. RESULTS Beta 1-adrenergic receptor mRNA levels in the biopsy specimens were decreased by 7% in mild (New York Heart Association functional class II), 26% in moderate (functional class III) and > 50% in severe heart failure (functional class IV). There was a good correlation between hemodynamic indicators of heart failure and beta 1-adrenergic receptor mRNA levels. In contrast, beta 2-adrenergic receptor mRNA levels were apparently unaffected by heart failure. CONCLUSIONS Reduced beta 1-adrenergic receptor mRNA levels occur early in heart failure and can be detected in septal biopsy specimens during right heart catheterization. The reduction in beta 1-adrenergic receptor expression may contribute to further loss of cardiac function.
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Affiliation(s)
- S Engelhardt
- Laboratorium für Molekulare Biologie, Universität München, Germany
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Abstract
We assessed by radioligand binding techniques the effect of cardiac failure on beta-adrenoceptor density in 5 hearts from patients undergoing repeat transplantation and 5 normal (unused donor) hearts. Right ventricular total and subtype beta-adrenoceptors in the denervated repeat-transplant hearts were down-regulated compared with the normally innervated controls. Within the denervated hearts, beta 1-adrenoceptors were selectively down-regulated in the right ventricle compared with the left ventricle. Tissue noradrenaline content confirmed sympathetic denervation in the transplanted hearts. Thus, regional sympathetic innervation is not necessary for chamber-specific beta-adrenoceptor down-regulation; other mechanisms for this process should be sought.
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Affiliation(s)
- M R Chester
- National Heart and Lung Institute, London, UK
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