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Dănilă MD, Privistirescu AI, Mirica SN, Sturza A, Ordodi V, Noveanu L, Duicu OM, Muntean DM. Acute inhibition of monoamine oxidase and ischemic preconditioning in isolated rat hearts: interference with postischemic functional recovery but no effect on infarct size reduction. Can J Physiol Pharmacol 2015; 93:819-25. [PMID: 26322912 DOI: 10.1139/cjpp-2015-0103] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Monoamine oxidases (MAOs) have recently emerged as important mitochondrial sources of oxidative stress in the cardiovascular system. Generation of reactive oxygen species during the brief episodes of ischemic preconditioning (IPC) is responsible for the cardioprotection at reperfusion. The aim of this study was to assess the effects of two MAO inhibitors (clorgyline and pargyline) on the IPC-related protection in isolated rat hearts. Animals subjected to 30 min global ischemia and 120 min reperfusion were assigned to the following groups: (i) Control, no additional intervention; (ii) IPC, 3 cycles of 5 min ischemia and 5 min reperfusion before the index ischemia; (iii) IPC-clorgyline, IPC protocol bracketed for 5 min with clorgyline (50 μmol/L); (iv) IPC-pargyline, IPC protocol bracketed for 5 min with pargyline (0.5 mmol/L). The postischemic functional recovery was assessed by the left ventricular developed pressure (LVDP) and the indices of contractility (+dLVP/dt max) and relaxation (-dLVP/dt max). Infarct size (IS) was quantified by TTC staining. In both genders, IPC significantly improved functional recovery that was further enhanced in the presence of either clorgyline or pargyline. IS reduction was comparable among all the preconditioned groups, regardless of the presence of MAO inhibitors. In isolated rat hearts, acute inhibition of MAOs potentiates the IPC-induced postischemic functional recovery without interfering with the anti-necrotic protection.
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Affiliation(s)
- Maria D Dănilă
- a Department of Pathophysiology, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timișoara, Romania.,b Center for Translational Research and Systems Medicine, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timişoara, Romania
| | - Andreea I Privistirescu
- a Department of Pathophysiology, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timișoara, Romania
| | - Silvia N Mirica
- a Department of Pathophysiology, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timișoara, Romania
| | - Adrian Sturza
- a Department of Pathophysiology, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timișoara, Romania.,b Center for Translational Research and Systems Medicine, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timişoara, Romania
| | - Valentin Ordodi
- a Department of Pathophysiology, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timișoara, Romania
| | - Lavinia Noveanu
- a Department of Pathophysiology, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timișoara, Romania.,b Center for Translational Research and Systems Medicine, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timişoara, Romania
| | - Oana M Duicu
- a Department of Pathophysiology, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timișoara, Romania.,b Center for Translational Research and Systems Medicine, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timişoara, Romania
| | - Danina M Muntean
- a Department of Pathophysiology, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timișoara, Romania.,b Center for Translational Research and Systems Medicine, "Victor Babeş" University of Medicine and Pharmacy of Timişoara, Timişoara, Romania
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Yamakawa K, Zhou W, Ko Y, Benharash P, Takemoto M, Mahajan A. Improved cardioprotection using a novel stepwise ischemic preconditioning protocol in rabbit heart. J Surg Res 2014; 188:381-6. [DOI: 10.1016/j.jss.2014.01.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 01/06/2014] [Accepted: 01/10/2014] [Indexed: 01/22/2023]
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The Effects of Prenatal Protein Restriction on β-Adrenergic Signalling of the Adult Rat Heart during Ischaemia Reperfusion. J Nutr Metab 2012; 2012:397389. [PMID: 22536490 PMCID: PMC3321448 DOI: 10.1155/2012/397389] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Revised: 01/18/2012] [Accepted: 01/20/2012] [Indexed: 01/04/2023] Open
Abstract
A maternal low-protein diet (MLP) fed during pregnancy leads to hypertension in adult rat offspring. Hypertension is a major risk factor for ischaemic heart disease. This study examined the capacity of hearts from MLP-exposed offspring to recover from myocardial ischaemia-reperfusion (IR) and related this to cardiac expression of β-adrenergic receptors (β-AR) and their associated G proteins. Pregnant rats were fed control (CON) or MLP diets (n = 12 each group) throughout pregnancy. When aged 6 months, hearts from offspring underwent Langendorff cannulation to assess contractile function during baseline perfusion, 30 min ischemia and 60 min reperfusion. CON male hearts demonstrated impaired recovery in left ventricular pressure (LVP) and dP/dtmax (P < 0.01) during reperfusion when compared to MLP male hearts. Maternal diet had no effect on female hearts to recover from IR. MLP males exhibited greater membrane expression of β2-AR following reperfusion and urinary excretion of noradrenaline and dopamine was lower in MLP and CON female rats versus CON males. In conclusion, the improved cardiac recovery in MLP male offspring following IR was attributed to greater membrane expression of β2-AR and reduced noradrenaline and dopamine levels. In contrast, females exhibiting both decreased membrane expression of β2-AR and catecholamine levels were protected from IR injury.
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Babai L, Papp JG, Parratt JR, Végh Á. The antiarrhythmic effects of ischaemic preconditioning in anaesthetized dogs are prevented by atropine; role of changes in baroreceptor reflex sensitivity. Br J Pharmacol 2002; 135:55-64. [PMID: 11786480 PMCID: PMC1573109 DOI: 10.1038/sj.bjp.0704445] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
1. Dogs, anaesthetized with chloralose and urethane, were subjected to a 25 min occlusion of the left anterior descending coronary artery. This resulted in ventricular ectopic activity, a reduction in baroreflex sensitivity (BRS, measured following the intravenous administration of phenylephrine), elevations in the epicardial ST-segment and increases in the degree of inhomogeneity of electrical activation, both measured from the ischaemic region of the left ventricular wall. 2. These changes were markedly reduced when the 25 min occlusion was preceded, 20 min earlier, by a 5 min (preconditioning) occlusion of the same coronary artery (e.g. VF during ischaemia reduced from 40% in the controls to 0%; P<0.05; BRS increased from 1.22+/-0.23 pre-occlusion to 1.61+/-0.25 mmHg ms(-1) post-occlusion in preconditioned dogs; cf. 1.28+/-0.29 to 0.45+/-0.12 mmHg ms(-1) respectively in the controls, P<0.05). 3. These beneficial effects of preconditioning were prevented by the administration, 10 min prior to the 25 min coronary artery occlusion, of atropine (1 mg kg(-1) i.v. followed by a continuous infusion of 0.04 mg kg(-1) h(-1)). For example, VF during occlusion was increased from 0% in the preconditioned dogs to 40% (P<0.05) in the presence of atropine and BRS was again reduced during occlusion (from 1.75+/-0.29 to 0.30+/-0.08 mmHg ms(-1); P<0.05). 4. We conclude that preconditioning reduces arrhythmia severity during ischaemia by favourably modifying cardiac autonomic receptor mechanism through enhancing vagal influences.
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Affiliation(s)
- László Babai
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Dóm tér 12, P.O. Box 427, H-6701 Hungary
| | - Julius Gy Papp
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Dóm tér 12, P.O. Box 427, H-6701 Hungary
- Research Unit for Cardiovascular Pharmacology, Hungarian Academy of Sciences, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Dóm tér 12, P.O. Box 427, H-6701 Hungary
| | - James R Parratt
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Dóm tér 12, P.O. Box 427, H-6701 Hungary
- Department of Physiology and Pharmacology, Strathclyde Institute for Biomedical Sciences, 27 Taylor Street, Glasgow G4 0NR
| | - Ágnes Végh
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Dóm tér 12, P.O. Box 427, H-6701 Hungary
- Author for correspondence:
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Costa F, Christensen NJ, Farley G, Biaggioni I. NO modulates norepinephrine release in human skeletal muscle: implications for neural preconditioning. Am J Physiol Regul Integr Comp Physiol 2001; 280:R1494-8. [PMID: 11294774 DOI: 10.1152/ajpregu.2001.280.5.r1494] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The purpose of this study was to estimate muscle interstitial norepinephrine (NE) levels during exercise and to determine whether nitric oxide (NO) modulates NE release in the skeletal muscle in humans. We measured interstitial dialysate concentrations of NE with two microdialysis probes inserted into the forearm. Probes were perfused with saline and the NO synthesis inhibitor N(G)-monomethyl-L-arginine (L-NMMA), respectively. Dialysate samples were collected during two sequential 20-min intense dynamic handgrip periods, preceded by 40-min baseline periods. On a different day, forearm ischemia was performed instead of the first exercise period. Exercise increased dialysate NE from 172 +/- 42 to 270 +/- 45 pg/ml (83% increase, P < 0.02, n = 6). Probes perfused with L-NMMA had a 136 +/- 39% greater dialysate NE compared with probes perfused with saline (225 +/- 25 vs. 125 +/- 25 pg/ml, P < 0.001, n = 9). The exercise-induced increase in NE (125 +/- 52%) was attenuated if preceded by exercise (34 +/- 34%) or ischemia (40 +/- 36%; P = 0.06, n = 6), suggesting a neural preconditioning effect. This attenuation was not observed in probes perfused with L-NMMA. We propose that NO modulates NE release in skeletal muscle, that ischemic exercise increases muscle interstitial NE, and that this increase can be attenuated by a preconditioning effect mediated in part by NO.
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Affiliation(s)
- F Costa
- Division of Clinical Pharmacology, Departments of Medicine and Pharmacology, Vanderbilt University, Nashville, Tennessee 37212-8210, USA
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