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Boidin M, David LP, Trachsel LD, Gayda M, Tremblay J, Lalongé J, Juneau M, Nigam A, Henri C. Impact of 2 different aerobic periodization training protocols on left ventricular function in patients with stable coronary artery disease: an exploratory study. Appl Physiol Nutr Metab 2020; 46:436-442. [PMID: 33108743 DOI: 10.1139/apnm-2020-0423] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We compared the impacts of linear (LP) and nonlinear (NLP) aerobic training periodizations on left ventricular (LV) function and geometry in coronary artery disease (CAD) patients. Thirty-nine CAD patients were randomized to either a 3-month isoenergetic supervised LP or NLP. All underwent standard echocardiography with assessment of 3D LV ejection fraction (LVEF), diastolic function, strain (global longitudinal, radial, and circumferential), and strain rate at baseline and study end. Training was performed 3 times/week and included high-intensity interval and moderate-intensity continuous training sessions. Training load was progressively increased in the LP group, while it was deeply increased and intercepted with a recovery week each fourth week in the NLP group. For the 34 analyzed patients, we found similar improvements for 3D LVEF (effect size (ES): LP, 0.29; NLP, 0.77), radial strain (ES: LP, 0.58; NLP, 0.48), and radial strain rate (ES: LP, 0.87; NLP, 0.17) in both groups (time for all: p ≤ 0.01). All other parameters of cardiac function remained similar. In conclusion, NLP and LP led to similar improvements in 3D LVEF and radial strain, suggesting a favourable positive cardiac remodelling through myofibers reorganization. These findings must be investigated in patients with more severe cardiac dysfunction. The study was registered on ClinicalTrials.gov (NCT03443193). Novelty: Linear and nonlinear periodization programs improved radial strain, accompanied by improvement of ejection fraction. Both aerobic periodization programs did not negatively impact cardiac function in coronary artery disease patients.
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Affiliation(s)
- Maxime Boidin
- School of Kinesiology and Exercise Science, Faculty of Medicine, University of Montreal, Montreal, QC H3T 1J4, Canada.,Cardiovascular Prevention and Rehabilitation (ÉPIC) Center, Montreal Heart Institute, Montreal, QC H1T 1N6, Canada
| | - Louis-Philippe David
- Department of Medicine, Faculty of Medicine, University of Montreal, Montreal, QC H3T 1J4, Canada
| | - Lukas D Trachsel
- Cardiovascular Prevention and Rehabilitation (ÉPIC) Center, Montreal Heart Institute, Montreal, QC H1T 1N6, Canada.,University Clinic for Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, 3010 Switzerland
| | - Mathieu Gayda
- Department of Medicine, Faculty of Medicine, University of Montreal, Montreal, QC H3T 1J4, Canada.,Research Centre, Montreal Heart Institute, Montreal, QC H1T 1C8, Canada
| | - Jonathan Tremblay
- School of Kinesiology and Exercise Science, Faculty of Medicine, University of Montreal, Montreal, QC H3T 1J4, Canada
| | - Julie Lalongé
- Cardiovascular Prevention and Rehabilitation (ÉPIC) Center, Montreal Heart Institute, Montreal, QC H1T 1N6, Canada.,Research Centre, Montreal Heart Institute, Montreal, QC H1T 1C8, Canada
| | - Martin Juneau
- Department of Medicine, Faculty of Medicine, University of Montreal, Montreal, QC H3T 1J4, Canada.,Research Centre, Montreal Heart Institute, Montreal, QC H1T 1C8, Canada
| | - Anil Nigam
- Department of Medicine, Faculty of Medicine, University of Montreal, Montreal, QC H3T 1J4, Canada.,Research Centre, Montreal Heart Institute, Montreal, QC H1T 1C8, Canada
| | - Christine Henri
- Department of Medicine, Faculty of Medicine, University of Montreal, Montreal, QC H3T 1J4, Canada.,Research Centre, Montreal Heart Institute, Montreal, QC H1T 1C8, Canada
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Kirsh AJ, Juracic ES, Petrick HL, Monaco CMF, Barbeau PA, Tupling AR, Holloway GP. Dietary nitrate does not alter cardiac function, calcium handling proteins, or SERCA activity in the left ventricle of healthy rats. Appl Physiol Nutr Metab 2020; 45:1049-1053. [PMID: 32379978 DOI: 10.1139/apnm-2020-0078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Dietary nitrate has been shown to increase cytosolic calcium concentrations within the heart, which would necessitate greater calcium sequestration for relaxation. In the present study we demonstrate that while nitrate supplementation reduced blood pressure, calcium-handling protein content, sarco(endo)plasmic reticulum Ca-ATPase 2a (SERCA) enzymatic properties, and left ventricular function were not altered. In addition, nitrite did not alter in vitro SERCA activity. Combined, these data suggest that in healthy rats, dietary nitrate does not increase left ventricle SERCA-related calcium-handling properties. Novelty Dietary nitrate decreases blood pressure but does not alter left ventricular calcium-handling protein content or SERCA activity in healthy rats.
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Affiliation(s)
- Aleah J Kirsh
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Emma S Juracic
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada
| | - Heather L Petrick
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Cynthia M F Monaco
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Pierre-Andre Barbeau
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - A Russell Tupling
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada
| | - Graham P Holloway
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
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3
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Peng H, Xu J, Yang XP, Kassem KM, Rhaleb IA, Peterson E, Rhaleb NE. N-acetyl-seryl-aspartyl-lysyl-proline treatment protects heart against excessive myocardial injury and heart failure in mice. Can J Physiol Pharmacol 2019; 97:753-765. [PMID: 30998852 PMCID: PMC6824427 DOI: 10.1139/cjpp-2019-0047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Myocardial infarction (MI) in mice results in cardiac rupture at 4-7 days after MI, whereas cardiac fibrosis and dysfunction occur later. N-acetyl-seryl-aspartyl-lysyl-proline (Ac-SDKP) has anti-inflammatory, anti-fibrotic, and pro-angiogenic properties. We hypothesized that Ac-SDKP reduces cardiac rupture and adverse cardiac remodeling, and improves function by promoting angiogenesis and inhibiting detrimental reactive fibrosis and inflammation after MI. C57BL/6J mice were subjected to MI and treated with Ac-SDKP (1.6 mg/kg per day) for 1 or 5 weeks. We analyzed (1) intercellular adhesion molecule-1 (ICAM-1) expression; (2) inflammatory cell infiltration and angiogenesis; (3) gelatinolytic activity; (4) incidence of cardiac rupture; (5) p53, the endoplasmic reticulum stress marker CCAAT/enhancer binding protein homology protein (CHOP), and cardiomyocyte apoptosis; (6) sarcoplasmic reticulum Ca2+ ATPase (SERCA2) expression; (7) interstitial collagen fraction and capillary density; and (8) cardiac remodeling and function. Acutely, Ac-SDKP reduced cardiac rupture, decreased ICAM-1 expression and the number of infiltrating macrophages, decreased gelatinolytic activity, p53 expression, and myocyte apoptosis, but increased capillary density in the infarction border. Chronically, Ac-SDKP improved cardiac structures and function, reduced CHOP expression and interstitial collagen fraction, and preserved myocardium SERCA2 expression. Thus, Ac-SDKP decreased cardiac rupture, ameliorated adverse cardiac remodeling, and improved cardiac function after MI, likely through preserved SERCA2 expression and inhibition of endoplasmic reticulum stress.
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Affiliation(s)
- Hongmei Peng
- a Hypertension and Vascular Research Division, Department of Internal Medicine, Detroit, MI 48202, USA
| | - Jiang Xu
- a Hypertension and Vascular Research Division, Department of Internal Medicine, Detroit, MI 48202, USA
| | - Xiao-Ping Yang
- a Hypertension and Vascular Research Division, Department of Internal Medicine, Detroit, MI 48202, USA
| | - Kamal M Kassem
- b Department of Internal Medicine, University of Cincinnati Medical Center, Cincinnati, OH 45219, USA
| | - Imane A Rhaleb
- a Hypertension and Vascular Research Division, Department of Internal Medicine, Detroit, MI 48202, USA
| | - Ed Peterson
- c Department of Public Health Sciences, Henry Ford Hospital, Detroit, MI 48202, USA
| | - Nour-Eddine Rhaleb
- a Hypertension and Vascular Research Division, Department of Internal Medicine, Detroit, MI 48202, USA
- d Department of Physiology, Wayne State University, Detroit, MI 48201, USA
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4
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Okatan EN, Turan B. The contribution of phosphodiesterases to cardiac dysfunction in rats with metabolic syndrome induced by a high-carbohydrate diet. Can J Physiol Pharmacol 2019; 97:1064-1072. [PMID: 31299169 DOI: 10.1139/cjpp-2019-0006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Metabolic syndrome (MetS) is a cluster of risk factors, including insulin resistance among others, underlying the development of diabetes and (or) cardiovascular diseases. Studies show a close relationship between cardiac dysfunction and abnormal cAMP catabolism, which contributes to pathological remodelling. Stimulating the synthesis of cAMP via suppression of phosphodiesterases (PDEs) has positive therapeutic effects. Therefore, we examined the role of PDEs on cardiac dysfunction in high-carbohydrate diet-induced MetS rats. We first demonstrated significantly high expression levels of PDE3 and PDE4, the most highly expressed subtypes, together with depressed cAMP levels in heart tissue from MetS rats. Second, we demonstrated the activity of these PDEs by using either their basal or PDE inhibitor-induced intracellular levels of cAMP and Ca2+, the transient intracellular Ca2+ changes under electrical stimulation, isometric contractions in papillary muscle strips and some key signalling proteins (such as RyR2, PLN, PP1A, and PKA) are responsible for the Ca2+ homeostasis in isolated cardiomyocytes from MetS rats. The clear recovery in decreased basal cAMP levels, increased protein expression levels of PDE3 and PDE4, and positive responses in the altered Ca2+ homeostasis to PDE inhibitors as seen in our study can provide important insights about the roles of activated PDEs in depressed contractile activity in hearts from MetS rats.
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Affiliation(s)
- Esma N Okatan
- Department of Biophysics, Ankara University, Faculty of Medicine, 06100 Ankara, Turkey.,Department of Biophysics, Ankara University, Faculty of Medicine, 06100 Ankara, Turkey
| | - Belma Turan
- Department of Biophysics, Ankara University, Faculty of Medicine, 06100 Ankara, Turkey.,Department of Biophysics, Ankara University, Faculty of Medicine, 06100 Ankara, Turkey
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Kumar N, Garg A, Bhatt DL, Sabongui S, Gupta N, Chaudhry S, Arena R, Verma S. Empagliflozin improves cardiorespiratory fitness in type 2 diabetes: translational implications. Can J Physiol Pharmacol 2019; 96:1184-1187. [PMID: 30265814 DOI: 10.1139/cjpp-2018-0359] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Sodium-glucose cotransporter 2 (SGLT2) inhibitors have been shown to prevent heart failure and reduce cardiovascular death in patients with type 2 diabetes (T2DM) and cardiovascular disease (CVD). Whether or not SGLT2 inhibitors improve indices of cardiorespiratory fitness (CRF), an independent predictor of mortality in patients with CVD, remains unknown. We evaluated the effects of empagliflozin on indices of CRF in patients with T2DM. Twenty patients with T2DM received either empagliflozin 10 mg or usual care. Baseline and 3- to 6-month post-treatment measurements of CRF were evaluated using cardiopulmonary exercise testing on a cycle ergometer. Treatment with empagliflozin led to an increased peak oxygen consumption (VO2), reduction in VE/VCO2 slope, and improvement in heart rate recovery. Our results suggest that SGLT2 inhibitors may improve markers of CRF in patients with T2DM. This may help provide important clues into the mechanism of benefit of SGLT2 inhibitors in clinical trials and provide a translational framework for the ongoing large studies of SGLT2 inhibitors in the treatment of heart failure.
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Affiliation(s)
- Naresh Kumar
- a Research Division, Whitby Cardiovascular Institute, Whitby, ON L1R 3J7, Canada
| | - Ankit Garg
- b Department of Medicine, University of Toronto, Toronto, ON M5G 2C4, Canada
| | - Deepak L Bhatt
- c Brigham and Women's Hospital Heart and Vascular Center and Harvard Medical School, Boston, MA 02115, USA
| | - Sandra Sabongui
- d Keenan Research Centre for Biomedical Science, St. Michael's Hospital, University of Toronto, Toronto, ON M5B 1W8, Canada
| | - Naveen Gupta
- d Keenan Research Centre for Biomedical Science, St. Michael's Hospital, University of Toronto, Toronto, ON M5B 1W8, Canada
| | - Sundeep Chaudhry
- e Division of Research and Development, MET-TEST, Atlanta, GA 30328, USA
| | - Ross Arena
- f Department of Physical Therapy, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Subodh Verma
- d Keenan Research Centre for Biomedical Science, St. Michael's Hospital, University of Toronto, Toronto, ON M5B 1W8, Canada
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Olgar Y, Turan B. A sodium-glucose cotransporter 2 (SGLT2) inhibitor dapagliflozin comparison with insulin shows important effects on Zn 2+-transporters in cardiomyocytes from insulin-resistant metabolic syndrome rats through inhibition of oxidative stress 1. Can J Physiol Pharmacol 2018; 97:528-535. [PMID: 30444646 DOI: 10.1139/cjpp-2018-0466] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Sodium-glucose cotransporter 2 (SGLT2) inhibitors showed significant effects in patients with diabetes or metabolic syndrome (MetS) with high cardiovascular risk. Although the increased intracellular Zn2+ level ([Zn2+]i), oxidative stress, and altered cardiac matrix metalloproteinases (MMPs) in diabetic cardiomyopathy can intersect with different signaling pathways, the exact mechanisms are not known yet. Since either MMPs or SGLT2 have important roles in cardiac-fibrosis under hyperglycemia, we aimed to examine the role of SGLT2 inhibitor dapagliflozin (DAP) on cardiac Zn2+-transporters responsible for [Zn2+]i-regulation, comparison to insulin (INS), together with MMP levels and systemic oxidative stress status in MetS-rats. High-carbohydrated diet-induced MetS-rats received DAP or INS for 2 weeks. DAP but not INS in MetS-rats significantly decreased high blood-glucose levels, while both treatments exerted benefits on increased total oxidative status and decreased total antioxidant status in MetS-rat plasma as well as in heart tissue. Protein levels of Zn2+-transporters, responsible for Zn2+-influx into cytosol, ZIP7 and ZIP14 were increased with significant decrease in ZIP8 of MetS-rat cardiomyoctes, while Zn2+-transporters, responsible for cytosolic Zn2+-efflux, ZnT7 was decreased with no change in ZnT8. Both treatments induced significant beneficial effects on altered ZIP14, ZIP8, and ZnT7 levels. Furthermore, both treatments exerted benefits on depressed gelatin-zymography and protein expression levels of MMP-2 and MMP-9 in MetS-rat ventricular cardiomyocytes. The direct effect of DAP on heart was also confirmed with measurements of left ventricular developed pressure. Overall, we showed that DAP has important antioxidant-like cardio-protective effects in MetS-rats, similar to INS-effect, affecting Zn2+-regulation via Zn2+-transporters, MMPs, and oxidative stress. Therefore one can suggest that SGLT2 inhibitors can be new therapeutic agents for cardio-protection not only in hyperglycemia but also in failing heart.
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Affiliation(s)
- Yusuf Olgar
- Departments of Biophysics and Internal Medicine, Faculty of Medicine, Ankara University, Ankara, Turkey.,Departments of Biophysics and Internal Medicine, Faculty of Medicine, Ankara University, Ankara, Turkey
| | - Belma Turan
- Departments of Biophysics and Internal Medicine, Faculty of Medicine, Ankara University, Ankara, Turkey.,Departments of Biophysics and Internal Medicine, Faculty of Medicine, Ankara University, Ankara, Turkey
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Mohammed Yusof NL, Zainalabidin S, Mohd Fauzi N, Budin SB. Hibiscus sabdariffa (roselle) polyphenol-rich extract averts cardiac functional and structural abnormalities in type 1 diabetic rats. Appl Physiol Nutr Metab 2018; 43:1224-1232. [PMID: 29726706 DOI: 10.1139/apnm-2018-0084] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Diabetes mellitus is often associated with cardiac functional and structural alteration, an initial event leading to cardiovascular complications. Roselle (Hibiscus sabdariffa) has been widely proven as an antioxidant and recently has incited research interest for its potential in treating cardiovascular disease. Therefore, this study aimed to determine the cardioprotective effects of H. sabdariffa (roselle) polyphenol-rich extract (HPE) in type-1-induced diabetic rats. Twenty-four male Sprague-Dawley rats were randomized into 4 groups (n = 6/group): nondiabetic, diabetic alone (DM), diabetic supplemented with HPE (DM+HPE), and diabetic supplemented with metformin. Type-1 diabetes was induced with streptozotocin (55 mg/kg intraperitoneally). Rats were forced-fed with HPE (100 mg/kg) and metformin (150 mg/kg) daily for 8 weeks. Results showed that HPE supplementation improved hyperglycemia and dyslipidemia significantly (p < 0.05) in the DM+HPE compared with the DM group. HPE supplementation attenuated cardiac oxidative damage in the DM group, indicated by low malondialdehyde and advanced oxidation protein product. As for the antioxidant status, HPE significantly (p < 0.05) increased glutathione level, as well as catalase and superoxide dismutase 1 and 2 activities. These findings correlate with cardiac function, whereby left ventricle developed pressure in DM+HPE (79.13 ± 3.08 mm Hg) was higher significantly compared with DM (45.84 ± 1.65 mm Hg). Coronary flow of DM+HPE (17.43 ± 0.62 mL/min) was also greater compared with DM (13.02 ± 0.6 mL/min), showing that HPE supplementation improved cardiac contractility and relaxation rate significantly (p < 0.05). Histological analysis showed a marked decrease in cardiomyocyte hypertrophy and fibrosis in DM+HPE compared with the DM group. Ultrastructural changes and impairment of mitochondria induced by diabetes were minimized by HPE supplementation. Collectively, these findings suggest that HPE is a potential cardioprotective agent in a diabetic setting through its hypoglycemic, anti-hyperlipidemia, and antioxidant properties.
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Affiliation(s)
- Nur Liyana Mohammed Yusof
- a Programme of Biomedical Science, School of Applied Health Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia (UKM), Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
| | - Satirah Zainalabidin
- a Programme of Biomedical Science, School of Applied Health Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia (UKM), Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
| | - Norsyahida Mohd Fauzi
- b Faculty of Pharmacy, Universiti Kebangsaan Malaysia (UKM), Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
| | - Siti Balkis Budin
- a Programme of Biomedical Science, School of Applied Health Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia (UKM), Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
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8
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Koentges C, Pfeil K, Meyer-Steenbuck M, Lother A, Hoffmann MM, Odening KE, Hein L, Bode C, Bugger H. Preserved recovery of cardiac function following ischemia-reperfusion in mice lacking SIRT3. Can J Physiol Pharmacol 2015; 94:72-80. [PMID: 26524632 DOI: 10.1139/cjpp-2015-0152] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Lack of the mitochondrial deacetylase sirtuin 3 (SIRT3) impairs mitochondrial function and increases the susceptibility to induction of the mitochondrial permeability transition pore. Because these alterations contribute to myocardial ischemia-reperfusion (IR) injury, we hypothesized that SIRT3 deficiency may increase cardiac injury following myocardial IR. Hearts of 10-week-old mice were perfused in the isolated working mode and subjected to 17.5 min of global no-flow ischemia, followed by 30 min of reperfusion. Measurements before ischemia revealed a decrease in cardiac power (-20%) and rate pressure product (-15%) in SIRT3(-/-) mice. Mitochondrial state 3 respiration (-15%), ATP synthesis (-39%), and ATP/O ratios (-29%) were decreased in hearts of SIRT3(-/-) mice. However, percent recovery of cardiac power (WT 94% ± 9%; SIRT3(-/-) 89% ± 9%) and rate pressure product (WT 89% ± 16%; SIRT3(-/-) 96% ± 3%) following IR was similar in both groups. Myocardial infarct size was not increased in SIRT3(-/-) mice following permanent ligation of the left anterior descending coronary artery (LAD). Left ventricular pressure and dP/dtmax, and mitochondrial respiration and ATP synthesis were not different between groups following LAD ligation. Thus, despite pre-existing defects in cardiac function and mitochondrial respiratory capacity in SIRT3(-/-) mice, SIRT3 deficiency does not additionally impair cardiac function following IR or following myocardial infarction.
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Affiliation(s)
- Christoph Koentges
- a Division of Cardiology and Angiology I, Heart Center Freiburg University, Freiburg, Germany
| | - Katharina Pfeil
- a Division of Cardiology and Angiology I, Heart Center Freiburg University, Freiburg, Germany
| | | | - Achim Lother
- a Division of Cardiology and Angiology I, Heart Center Freiburg University, Freiburg, Germany.,b Institute of Experimental and Clinical Pharmacology, and Centre for Biological Signalling Studies (BIOSS), University of Freiburg, Freiburg, Germany
| | - Michael M Hoffmann
- c Institute for Clinical Chemistry and Laboratory Medicine, Freiburg University Hospital, Freiburg, Germany
| | - Katja E Odening
- a Division of Cardiology and Angiology I, Heart Center Freiburg University, Freiburg, Germany
| | - Lutz Hein
- b Institute of Experimental and Clinical Pharmacology, and Centre for Biological Signalling Studies (BIOSS), University of Freiburg, Freiburg, Germany
| | - Christoph Bode
- a Division of Cardiology and Angiology I, Heart Center Freiburg University, Freiburg, Germany
| | - Heiko Bugger
- a Division of Cardiology and Angiology I, Heart Center Freiburg University, Freiburg, Germany
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Ayme K, Rossi P, Gavarry O, Chaumet G, Boussuges A. Cardiorespiratory alterations induced by low-intensity exercise performed in water or on land. Appl Physiol Nutr Metab 2015; 40:309-15. [PMID: 25761733 DOI: 10.1139/apnm-2014-0264] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of this study was to compare the cardiorespiratory alterations induced by a low-intensity exercise performed on land or in water. Sixteen healthy subjects were investigated. The exercise consisted of a 1-h period of ergocycling at 35%-40% of peak oxygen uptake. Investigations were performed at rest and 45 min after the beginning of the exercises. Hemodynamic changes were studied by Doppler-echocardiography. Gas exchanges were continuously monitored by an oxygen gas analyzer. Blood samples were taken successively at baseline, within the last minutes of the exercise bout, and during recovery to measure total protein concentration and natriuretic peptides. Cardiovascular parameters were not significantly different during exercise performed on land or in water. As a result of an accelerated breathing frequency, ventilation output was significantly greater in water. Biological changes included a decrease in total protein concentration and an increase in natriuretic peptides in water. During low-intensity exercise, ventilatory alterations favoured increasing the work of breathing while in the water when compared with the same exercise performed on land. Hemodynamic changes were similar in the 2 conditions. Furthermore, biological findings suggest that the fluid transfer from intravascular sector toward interstitial sector could be facilitated in water.
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Affiliation(s)
- Karine Ayme
- UMR-MD2, Dysoxie Suractivité, Institut de Recherche Biomédicale des Armées et Université d'Aix-Marseille, Marseille, France., INPP. Port de la Pointe Rouge entrée n°3, 13008 Marseille, France
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Saran V, Sharma V, Wambolt R, Yuen VG, Allard M, McNeill JH. Combined metoprolol and ascorbic acid treatment prevents intrinsic damage to the heart during diabetic cardiomyopathy. Can J Physiol Pharmacol 2014; 92:827-37. [PMID: 25229873 DOI: 10.1139/cjpp-2014-0078] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Metabolic disturbances and oxidative stress have been highlighted as potential causative factors for the development of diabetic cardiomyopathy. The β-blocker metoprolol is known to improve function in the diabetic rat heart and ameliorates the sequelae associated with oxidative stress, without lowering oxidative stress. The antioxidant ascorbic acid is known to improve function in the diabetic rat heart. We tested whether a combination of ascorbic acid and metoprolol treatment would improve function further than each drug individually. Control and streptozotocin-induced diabetic Wistar rats were treated with metoprolol (15 mg·(kg body mass)(-1)·day(-1), via an osmotic pump) and (or) ascorbic acid (1000 mg·(kg body mass)(-1)·day(-1), via their drinking water). To study the effect of treatment on the development of dysfunction, we examined time points before (5 weeks diabetic) and after (7 weeks diabetic) development of overt systolic dysfunction. Echocardiography and working-heart-perfusion were used to assess cardiac function. Blood and tissue samples were collected to assess the severity of disease and oxidative stress. While both drugs improved function, only ascorbic acid had effects on oxidative damage. Combination treatment had a more pronounced improvement in function. Our β-blocker + antioxidant treatment strategy focused on oxidative stress, not diabetes specifically; therefore, it may prove useful in other diseases where oxidative stress contributes to the pathology.
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Affiliation(s)
- Varun Saran
- a James Hogg Research Centre, Department of Pathology and Laboratory Medicine, University of British Columbia, St. Paul's Hospital, 1081 Burrard Street, Vancouver, BC V6Z 1Y6, Canada
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