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Costa-Pereira LV, Mendes BF, Magalhães COD, Rodrigues CM, de Andrade JA, de Pereira RRS, Esteves EA, Cassilhas RC, Andrade EF, Gripp F, de Magalhães FC, Sampaio KH, Improta-Caria AC, Amorim FT, Dias-Peixoto MF. Cardiometabolic and Cellular Adaptations to Multiple vs. Single Daily HIIT Sessions in Wistar Rats: Impact of Short-Term Detraining. Metabolites 2024; 14:447. [PMID: 39195543 DOI: 10.3390/metabo14080447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2024] [Revised: 08/08/2024] [Accepted: 08/08/2024] [Indexed: 08/29/2024] Open
Abstract
Multiple short daily bouts of HIIT are more effective than single daily sessions in improving cardiometabolic and cellular adaptations in rats. We hypothesize that a short period of detraining is sufficient to abolish the superior adaptive responses to multiple versus single daily sessions of HIIT in rats. Male rats were divided into untrained, 1xHIIT, and 3xHIIT groups. Over eight weeks, the 1xHIIT group performed 115 min single daily sessions of HIIT, while the 3xHIIT group performed three 5 min sessions with 4 h intervals. After training, both groups remained sedentary for four weeks (detraining). Resting oxygen consumption (VO2), body composition, glucose/insulin tolerance, and blood pressure were recorded. After euthanasia, cardiac function/histology and gastrocnemius mitochondrial density were analyzed. After training, both 1xHIIT and 3xHIIT protocols induced similar improvements in VO2, maximal oxygen uptake (VO2max), cardiac function/hypertrophy, and gastrocnemius mitochondrial density. These effects were maintained even after detraining. Only the 3xHIIT protocol improved insulin sensitivity. After detraining, this effect was abolished. After training, both 1xHIIT and 3xHIIT protocols reduced adiposity. After detraining, the adiposity increased in both groups, with a more pronounced increase in the 3xHIIT rats. A four-week detraining period abolishes the superior adaptive responses to multiple versus single daily HIIT sessions in rats.
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Affiliation(s)
- Liliane Vanessa Costa-Pereira
- Multicenter Graduate Program in Physiological Sciences, Brazilian Society of Physiology, Diamantina 39100-000, MG, Brazil
| | - Bruno Ferreira Mendes
- Multicenter Graduate Program in Physiological Sciences, Brazilian Society of Physiology, Diamantina 39100-000, MG, Brazil
| | - Caíque Olegário Diniz Magalhães
- Multicenter Graduate Program in Physiological Sciences, Brazilian Society of Physiology, Diamantina 39100-000, MG, Brazil
- Graduate Program in Health Sciences, Federal University of the Jequitinhonha and Mucuri Valleys, Diamantina 39100-000, MG, Brazil
| | - Cíntia Maria Rodrigues
- Multicenter Graduate Program in Physiological Sciences, Brazilian Society of Physiology, Diamantina 39100-000, MG, Brazil
| | - Júllia Alves de Andrade
- Graduate Program in Health Sciences, Federal University of the Jequitinhonha and Mucuri Valleys, Diamantina 39100-000, MG, Brazil
| | - Ramona Ramalho Souza de Pereira
- Graduate Program in Health Sciences, Federal University of the Jequitinhonha and Mucuri Valleys, Diamantina 39100-000, MG, Brazil
| | - Elizabethe Adriana Esteves
- Multicenter Graduate Program in Physiological Sciences, Brazilian Society of Physiology, Diamantina 39100-000, MG, Brazil
- Graduate Program in Health Sciences, Federal University of the Jequitinhonha and Mucuri Valleys, Diamantina 39100-000, MG, Brazil
| | - Ricardo Cardoso Cassilhas
- Multicenter Graduate Program in Physiological Sciences, Brazilian Society of Physiology, Diamantina 39100-000, MG, Brazil
- Graduate Program in Health Sciences, Federal University of the Jequitinhonha and Mucuri Valleys, Diamantina 39100-000, MG, Brazil
| | | | - Fernando Gripp
- Multicenter Graduate Program in Physiological Sciences, Brazilian Society of Physiology, Diamantina 39100-000, MG, Brazil
| | - Flávio Castro de Magalhães
- Multicenter Graduate Program in Physiological Sciences, Brazilian Society of Physiology, Diamantina 39100-000, MG, Brazil
- Graduate Program in Health Sciences, Federal University of the Jequitinhonha and Mucuri Valleys, Diamantina 39100-000, MG, Brazil
| | - Kinulpe Honorato Sampaio
- Multicenter Graduate Program in Physiological Sciences, Brazilian Society of Physiology, Diamantina 39100-000, MG, Brazil
- Graduate Program in Health Sciences, Federal University of the Jequitinhonha and Mucuri Valleys, Diamantina 39100-000, MG, Brazil
| | - Alex Cleber Improta-Caria
- Laboratory of Biochemistry and Molecular Biology of the Exercise, University of Sao Paulo, São Paulo 05508-090, SP, Brazil
| | - Fabiano Trigueiro Amorim
- Department of Health, Exercise and Sports Science, University of New Mexico, Albuquerque, NM 87131-0001, USA
| | - Marco Fabrício Dias-Peixoto
- Multicenter Graduate Program in Physiological Sciences, Brazilian Society of Physiology, Diamantina 39100-000, MG, Brazil
- Graduate Program in Health Sciences, Federal University of the Jequitinhonha and Mucuri Valleys, Diamantina 39100-000, MG, Brazil
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Kolomeyets NL, Ivonin AG, Peshkin EA, Roshchevskaya IM. Bioelectrical Impedance of the Left Ventricular Myocardium, Lung in Rats after Forced Swimming Training and Subsequent Detraining. J EVOL BIOCHEM PHYS+ 2023. [DOI: 10.1134/s0022093023010064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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Regulation of collagen deposition in the trout heart during thermal acclimation. Curr Res Physiol 2022; 5:99-108. [PMID: 35243359 PMCID: PMC8857596 DOI: 10.1016/j.crphys.2022.02.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 01/21/2022] [Accepted: 02/07/2022] [Indexed: 11/22/2022] Open
Abstract
The passive mechanical properties of the vertebrate heart are controlled in part by the composition of the extracellular matrix (ECM). Changes in the ECM, caused by increased blood pressure, injury or disease can affect the capacity of the heart to fill with blood during diastole. In mammalian species, cardiac fibrosis caused by an increase in collagen in the ECM, leads to a loss of heart function and these changes in composition are considered to be permanent. Recent work has demonstrated that the cardiac ventricle of some fish species have the capacity to both increase and decrease collagen content in response to thermal acclimation. It is thought that these changes in collagen content help maintain ventricle function over seasonal changes in environmental temperatures. This current work reviews the cellular mechanisms responsible for regulating collagen deposition in the mammalian heart and proposes a cellular pathway by which a change in temperature can affect the collagen content of the fish ventricle through mechanotransduction. This work specifically focuses on the role of transforming growth factor β1, MAPK signaling pathways, and biomechanical stretch in regulating collagen content in the fish ventricle. It is hoped that this work increases the appreciation of the use of comparative models to gain insight into phenomenon with biomedical relevance.
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Increased Expression of N2BA Titin Corresponds to More Compliant Myofibrils in Athlete's Heart. Int J Mol Sci 2021; 22:ijms222011110. [PMID: 34681770 PMCID: PMC8537917 DOI: 10.3390/ijms222011110] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/07/2021] [Accepted: 10/10/2021] [Indexed: 12/22/2022] Open
Abstract
Long-term exercise induces physiological cardiac adaptation, a condition referred to as athlete’s heart. Exercise tolerance is known to be associated with decreased cardiac passive stiffness. Passive stiffness of the heart muscle is determined by the giant elastic protein titin. The adult cardiac muscle contains two titin isoforms: the more compliant N2BA and the stiffer N2B. Titin-based passive stiffness may be controlled by altering the expression of the different isoforms or via post-translational modifications such as phosphorylation. Currently, there is very limited knowledge about titin’s role in cardiac adaptation during long-term exercise. Our aim was to determine the N2BA/N2B ratio and post-translational phosphorylation of titin in the left ventricle and to correlate the changes with the structure and transverse stiffness of cardiac sarcomeres in a rat model of an athlete’s heart. The athlete’s heart was induced by a 12-week-long swim-based training. In the exercised myocardium the N2BA/N2B ratio was significantly increased, Ser11878 of the PEVK domain was hypophosphorlyated, and the sarcomeric transverse elastic modulus was reduced. Thus, the reduced passive stiffness in the athlete’s heart is likely caused by a shift towards the expression of the longer cardiac titin isoform and a phosphorylation-induced softening of the PEVK domain which is manifested in a mechanical rearrangement locally, within the cardiac sarcomere.
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Oláh A, Barta BA, Sayour AA, Ruppert M, Virág-Tulassay E, Novák J, Varga ZV, Ferdinandy P, Merkely B, Radovits T. Balanced Intense Exercise Training Induces Atrial Oxidative Stress Counterbalanced by the Antioxidant System and Atrial Hypertrophy That Is Not Associated with Pathological Remodeling or Arrhythmogenicity. Antioxidants (Basel) 2021; 10:antiox10030452. [PMID: 33803975 PMCID: PMC7999710 DOI: 10.3390/antiox10030452] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 03/10/2021] [Accepted: 03/11/2021] [Indexed: 12/16/2022] Open
Abstract
Although regular exercise training is associated with cardiovascular benefits, the increased risk of atrial arrhythmias has been observed after vigorous exercise and has been related to oxidative stress. We aimed at investigating exercise-induced atrial remodeling in a rat model of an athlete’s heart and determining sex-specific differences. Age-matched young adult rats were divided into female exercised, female control, male exercised, and male control groups. After exercised animals completed a 12-week-long swim training protocol, echocardiography and in vivo cardiac electrophysiologic investigation were performed. Additionally, atrial histological and gene expression analyses were carried out. Post-mortem atrial weight data and histological examination confirmed marked atrial hypertrophy. We found increased atrial gene expression of antioxidant enzymes along with increased nitro-oxidative stress. No gene expression alteration was found regarding markers of pathological remodeling, apoptotic, proinflammatoric, and profibrotic processes. Exercise training was associated with a prolonged right atrial effective refractory period. We could not induce arrhythmias by programmed stimulation in any groups. We found decreased expression of potassium channels. Female gender was associated with lower profibrotic expression and collagen density. Long-term, balanced exercise training-induced atrial hypertrophy is not associated with harmful electrical remodeling, and no inflammatory or profibrotic response was observed in the atrium of exercised rats.
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Affiliation(s)
- Attila Oláh
- Heart and Vascular Center, Semmelweis University; Városmajor str. 68, 1122 Budapest, Hungary; (B.A.B.); (A.A.S.); (M.R.); (E.V.-T.); (B.M.); (T.R.)
- Correspondence: ; Tel.: +36-1-458-6810; Fax: +36-1-458-6842
| | - Bálint András Barta
- Heart and Vascular Center, Semmelweis University; Városmajor str. 68, 1122 Budapest, Hungary; (B.A.B.); (A.A.S.); (M.R.); (E.V.-T.); (B.M.); (T.R.)
| | - Alex Ali Sayour
- Heart and Vascular Center, Semmelweis University; Városmajor str. 68, 1122 Budapest, Hungary; (B.A.B.); (A.A.S.); (M.R.); (E.V.-T.); (B.M.); (T.R.)
| | - Mihály Ruppert
- Heart and Vascular Center, Semmelweis University; Városmajor str. 68, 1122 Budapest, Hungary; (B.A.B.); (A.A.S.); (M.R.); (E.V.-T.); (B.M.); (T.R.)
| | - Eszter Virág-Tulassay
- Heart and Vascular Center, Semmelweis University; Városmajor str. 68, 1122 Budapest, Hungary; (B.A.B.); (A.A.S.); (M.R.); (E.V.-T.); (B.M.); (T.R.)
| | - Julianna Novák
- HCEMM-SU Cardiometabolic Immunology Research Group, Semmelweis University; Nagyvárad tér 4, 1089 Budapest, Hungary; (J.N.); (Z.V.V.)
| | - Zoltán V. Varga
- HCEMM-SU Cardiometabolic Immunology Research Group, Semmelweis University; Nagyvárad tér 4, 1089 Budapest, Hungary; (J.N.); (Z.V.V.)
- Department of Pharmacology and Pharmacotherapy, Semmelweis University; Nagyvárad tér 4, 1089 Budapest, Hungary;
| | - Péter Ferdinandy
- Department of Pharmacology and Pharmacotherapy, Semmelweis University; Nagyvárad tér 4, 1089 Budapest, Hungary;
- Pharmahungary Group, 6722 Szeged, Hungary
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University; Városmajor str. 68, 1122 Budapest, Hungary; (B.A.B.); (A.A.S.); (M.R.); (E.V.-T.); (B.M.); (T.R.)
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University; Városmajor str. 68, 1122 Budapest, Hungary; (B.A.B.); (A.A.S.); (M.R.); (E.V.-T.); (B.M.); (T.R.)
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Increased Ca 2+ content of the sarcoplasmic reticulum provides arrhythmogenic trigger source in swimming-induced rat athlete's heart model. Sci Rep 2020; 10:19596. [PMID: 33177643 PMCID: PMC7658201 DOI: 10.1038/s41598-020-76496-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 10/21/2020] [Indexed: 12/17/2022] Open
Abstract
Sudden cardiac death among top athletes is very rare, however, it is 2–4 times more frequent than in the age-matched control population. In the present study, the electrophysiological consequences of long-term exercise training were investigated on Ca2+ homeostasis and ventricular repolarization, together with the underlying alterations of ion channel expression, in a rat athlete's heart model. 12-week swimming exercise-trained and control Wistar rats were used. Electrophysiological data were obtained by using ECG, patch clamp and fluorescent optical measurements. Protein and mRNA levels were determined by the Western immunoblot and qRT-PCR techniques. Animals in the trained group exhibited significantly lower resting heart rate, higher incidence of extrasystoles and spontaneous Ca2+ release events. The Ca2+ content of the sarcoplasmic reticulum (SR) and the Ca2+ transient amplitude were significantly larger in the trained group. Intensive physical training is associated with elevated SR Ca2+ content, which could be an important part of physiological cardiac adaptation mechanism to training. However, it may also sensitize the heart for the development of spontaneous Ca2+ release and extrasystoles. Training-associated remodeling may promote elevated incidence of life threatening arrhythmias in top athletes.
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Török M, Monori-Kiss A, Pál É, Horváth E, Jósvai A, Merkely P, Barta BA, Mátyás C, Oláh A, Radovits T, Merkely B, Ács N, Nádasy GL, Várbíró S. Long-term exercise results in morphological and biomechanical changes in coronary resistance arterioles in male and female rats. Biol Sex Differ 2020; 11:7. [PMID: 32051031 PMCID: PMC7017613 DOI: 10.1186/s13293-020-0284-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 02/05/2020] [Indexed: 12/16/2022] Open
Abstract
Background Biomechanical remodeling of coronary resistance arteries in physiological left ventricular hypertrophy has not yet been analyzed, and the possible sex differences are unknown. Methods Wistar rats were divided into four groups: male and female sedentary controls (MSe and FSe) and male and female animals undergoing a 12-week intensive swim training program (MEx and FEx). On the last day, the in vitro contractility, endothelium-dependent dilatation, and biomechanical properties of the intramural coronary resistance arteries were investigated by pressure microarteriography. Elastica and collagen remodeling were studied in histological sections. Results A similar outer radius and reduced inner radius resulted in an elevated wall to lumen ratio in the MEx and FEx animals compared to that in the sedentary controls. The wall elastic moduli increased in the MEx and FEx rats. Spontaneous and TxA2 agonist-induced tone was increased in the FEx animals, whereas endothelium-dependent relaxation became more effective in MEx rats. Arteries of FEx rats had stronger contraction, while arteries of MEx animals had improved dilation. Conclusions According to our results, the coronary arterioles adapted to an elevated load during long-term exercise, and this adaptation depended on sex. It is important to emphasize that in addition to differences, we also found many similarities between the sexes in the adaptive response to exercise. The observed sport adaptation in the coronary resistance arteries of rats may contribute to a better understanding of the physiological and pathological function of these arteries in active and retired athletes of different sexes.
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Affiliation(s)
- Marianna Török
- Department of Obstetrics and Gynecology, Semmelweis University, Üllői u. 78/a, Budapest, 1082, Hungary.
| | - Anna Monori-Kiss
- Institute of Clinical Experimental Research, Semmelweis University, Tűzoltó u. 37-47, Budapest, 1094, Hungary
| | - Éva Pál
- Institute of Clinical Experimental Research, Semmelweis University, Tűzoltó u. 37-47, Budapest, 1094, Hungary
| | - Eszter Horváth
- Department of Obstetrics and Gynecology, Semmelweis University, Üllői u. 78/a, Budapest, 1082, Hungary
| | - Attila Jósvai
- Department of Neurosurgery, Military Hospital, Róbert Károly körút 44, Budapest, 1134, Hungary
| | - Petra Merkely
- Department of Obstetrics and Gynecology, Semmelweis University, Üllői u. 78/a, Budapest, 1082, Hungary
| | - Bálint András Barta
- Heart and Vascular Center, Semmelweis University, Városmajor u 68, Budapest, 1122, Hungary
| | - Csaba Mátyás
- Heart and Vascular Center, Semmelweis University, Városmajor u 68, Budapest, 1122, Hungary
| | - Attila Oláh
- Heart and Vascular Center, Semmelweis University, Városmajor u 68, Budapest, 1122, Hungary
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University, Városmajor u 68, Budapest, 1122, Hungary
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Városmajor u 68, Budapest, 1122, Hungary
| | - Nándor Ács
- Department of Obstetrics and Gynecology, Semmelweis University, Üllői u. 78/a, Budapest, 1082, Hungary
| | - György László Nádasy
- Department of Physiology, Semmelweis University, Tűzoltó u 37-47, Budapest, 1094, Hungary
| | - Szabolcs Várbíró
- Department of Obstetrics and Gynecology, Semmelweis University, Üllői u. 78/a, Budapest, 1082, Hungary
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Chatterjee E, Chaudhuri RD, Sarkar S. Cardiomyocyte targeted overexpression of IGF1 during detraining restores compromised cardiac condition via mTORC2 mediated switching of PKCδ to PKCα. Biochim Biophys Acta Mol Basis Dis 2019; 1865:2736-2752. [DOI: 10.1016/j.bbadis.2019.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/22/2019] [Accepted: 07/06/2019] [Indexed: 02/05/2023]
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Oláh A, Mátyás C, Kellermayer D, Ruppert M, Barta BA, Sayour AA, Török M, Koncsos G, Giricz Z, Ferdinandy P, Merkely B, Radovits T. Sex Differences in Morphological and Functional Aspects of Exercise-Induced Cardiac Hypertrophy in a Rat Model. Front Physiol 2019; 10:889. [PMID: 31354526 PMCID: PMC6639783 DOI: 10.3389/fphys.2019.00889] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 06/26/2019] [Indexed: 01/20/2023] Open
Abstract
Background: Recent evidences suggest that sex hormones may be involved in the regulation of exercise-induced left ventricular (LV) hypertrophy. However, the sex-specific functional consequences of exercise-induced myocardial hypertrophy is still not investigated in detail. We aimed at understanding the sex-specific functional and morphological alterations in the LV and the underlying molecular changes in a rat model of athlete’s heart. Methods: We divided our young, adult male and female rats into control and exercised groups. Athlete’s heart was induced by a 12-week long swim training. Following the training period, we assessed LV hypertrophy with echocardiography, while pressure-volume analysis was performed to investigate in vivo LV function. After in vivo experiments, molecular biological studies and histological investigations were performed. Results: Echocardiography and post-mortem measured heart weight data indicated LV hypertrophy in both genders, nevertheless it was more pronounced in females. Despite the more significant relative hypertrophy in females, characteristic functional parameters did not show notable differences between the genders. LV pressure-volume analysis showed increased stroke volume, improved contractility and stroke work and unaltered LV stiffness in both male and female exercised rats, while active relaxation was ameliorated solely in male animals. The induction of Akt signaling was more significant in females compared to males. There was also a characteristic difference in the mitogen-activated protein kinase pathway as suppressed phosphorylation of p44/42 MAPK (Erk) and mTOR was observed in female exercised rats, but not in male ones. Myosin heavy chain α (MHC)/β-MHC ratio did not differ in males, but increased markedly in females. Conclusion: Our results confirm that there is a more pronounced exercise-induced LV hypertrophy in females as compared to the males, however, there are only minor differences regarding LV function. There are characteristic molecular differences between male and female animals, that can explain different degrees of LV hypertrophy.
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Affiliation(s)
- Attila Oláh
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Csaba Mátyás
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | | | - Mihály Ruppert
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | | | - Alex Ali Sayour
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Marianna Török
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Gábor Koncsos
- Department of Pharmacology and Pharmacotherapy, Semmelweis University, Budapest, Hungary
| | - Zoltáng Giricz
- Department of Pharmacology and Pharmacotherapy, Semmelweis University, Budapest, Hungary
| | - Péter Ferdinandy
- Department of Pharmacology and Pharmacotherapy, Semmelweis University, Budapest, Hungary.,Pharmahungary Group, Szeged, Hungary
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
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Oláh A, Ruppert M, Orbán TI, Apáti Á, Sarkadi B, Merkely B, Radovits T. Hemodynamic characterization of a transgenic rat strain stably expressing the calcium sensor protein GCaMP2. Am J Physiol Heart Circ Physiol 2019; 316:H1224-H1228. [DOI: 10.1152/ajpheart.00074.2019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A novel transgenic rat strain has recently been generated that stably expresses the genetically engineered calcium sensor protein GCaMP2 in different cell types, including cardiomyocytes, to investigate calcium homeostasis. To investigate whether the expression of the GCaMP2 protein itself affects cardiac function, in the present work we aimed at characterizing in vivo hemodynamics in the GCaMP2 transgenic rat strain. GCaMP2 transgenic rats and age-matched Sprague-Dawley control animals were investigated. In vivo hemodynamic characterization was performed by left ventricular (LV) pressure-volume analysis. Postmortem heart weight data showed cardiac hypertrophy in the GCaMP2 group (heart-weight-to-tibial-length ratio: 0.26 ± 0.01 GCaMP2 vs. 0.23 ± 0.01 g/cm Co, P < 0.05). We detected elevated mean arterial pressure and increased total peripheral resistance in transgenic rats. GCaMP2 transgenesis was associated with prolonged contraction and relaxation. LV systolic function was not altered in transgenic rats, as indicated by conventional parameters and load-independent, sensitive indices. We found a marked deterioration of LV active relaxation in GCaMP2 animals (τ: 16.8 ± 0.7 GCaMP2 vs. 12.2 ± 0.3 ms Co, P < 0.001). Our data indicated myocardial hypertrophy, arterial hypertension, and impaired LV active relaxation along with unchanged systolic performance in the heart of transgenic rats expressing the GCaMP2 fluorescent calcium sensor protein. Special caution should be taken when using transgenic models in cardiovascular studies. NEW & NOTEWORTHY Genetically encoded Ca2+-sensors, like GCaMP2, are important tools to reveal molecular mechanisms for Ca2+-sensing. We provided left ventricular hemodynamic characterization of GCaMP2 transgenic rats and found increased afterload, cardiac hypertrophy, and prolonged left ventricular relaxation, along with unaltered systolic function and contractility. Special caution should be taken when using this rodent model in cardiovascular pharmacological and toxicological studies.
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Affiliation(s)
- Attila Oláh
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Mihály Ruppert
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Tamás István Orbán
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Ágota Apáti
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Balázs Sarkadi
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
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Oláh A, Kovács A, Lux Á, Tokodi M, Braun S, Lakatos BK, Mátyás C, Kellermayer D, Ruppert M, Sayour AA, Barta BA, Merkely B, Radovits T. Characterization of the dynamic changes in left ventricular morphology and function induced by exercise training and detraining. Int J Cardiol 2018; 277:178-185. [PMID: 30442376 DOI: 10.1016/j.ijcard.2018.10.092] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 07/06/2018] [Accepted: 10/26/2018] [Indexed: 11/29/2022]
Abstract
BACKGROUND Although exercise-induced cardiac hypertrophy has been intensively investigated, its development and regression dynamics have not been comprehensively described. In the current study, we aimed to characterize the effects of regular exercise training and detraining on left ventricular (LV) morphology and function. METHODS Rats were divided into exercised (n = 12) and control (n = 12) groups. Exercised rats swam 200 min/day for 12 weeks. After completion of the training protocol, rats remained sedentary for 8 weeks (detraining period). Echocardiographic follow-up was performed regularly to obtain LV long- and short-axis recordings for speckle-tracking echocardiography analysis. Global longitudinal and circumferential strain and systolic strain rate were measured. LV pressure-volume analysis was performed using additional groups of rats to obtain haemodynamic data. RESULTS Echocardiographic examinations showed the development of LV hypertrophy in the exercised group. These differences disappeared during the detraining period. Strain and strain rate values were all increased after the training period, whereas supernormal values rapidly reversed to the control level after training cessation. Load-independent haemodynamic indices, e.g., preload recruitable stroke work, confirmed the exercise-induced systolic improvement and complete regression after detraining. CONCLUSIONS AND TRANSLATIONAL ASPECT Our results provide the first comprehensive data to describe the development and regression dynamics of morphological and functional aspects of physiological hypertrophy in detail. Speckle-tracking echocardiography has been proven to be feasible to follow-up changes induced by exercise training and detraining and might provide an early possibility to differentiate between physiological and pathological conditions.
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Affiliation(s)
- Attila Oláh
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary.
| | - Attila Kovács
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Árpád Lux
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Márton Tokodi
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | | | | | - Csaba Mátyás
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | | | - Mihály Ruppert
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Alex Ali Sayour
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | | | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
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Fulghum K, Hill BG. Metabolic Mechanisms of Exercise-Induced Cardiac Remodeling. Front Cardiovasc Med 2018; 5:127. [PMID: 30255026 PMCID: PMC6141631 DOI: 10.3389/fcvm.2018.00127] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 08/23/2018] [Indexed: 12/13/2022] Open
Abstract
Exercise has a myriad of physiological benefits that derive in part from its ability to improve cardiometabolic health. The periodic metabolic stress imposed by regular exercise appears fundamental in driving cardiovascular tissue adaptation. However, different types, intensities, or durations of exercise elicit different levels of metabolic stress and may promote distinct types of tissue remodeling. In this review, we discuss how exercise affects cardiac structure and function and how exercise-induced changes in metabolism regulate cardiac adaptation. Current evidence suggests that exercise typically elicits an adaptive, beneficial form of cardiac remodeling that involves cardiomyocyte growth and proliferation; however, chronic levels of extreme exercise may increase the risk for pathological cardiac remodeling or sudden cardiac death. An emerging theme underpinning acute as well as chronic cardiac adaptations to exercise is metabolic periodicity, which appears important for regulating mitochondrial quality and function, for stimulating metabolism-mediated exercise gene programs and hypertrophic kinase activity, and for coordinating biosynthetic pathway activity. In addition, circulating metabolites liberated during exercise trigger physiological cardiac growth. Further understanding of how exercise-mediated changes in metabolism orchestrate cell signaling and gene expression could facilitate therapeutic strategies to maximize the benefits of exercise and improve cardiac health.
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Affiliation(s)
- Kyle Fulghum
- Department of Medicine, Envirome Institute, Institute of Molecular Cardiology, Diabetes and Obesity Center, Louisville, KY, United States
- Department of Physiology, University of Louisville, Louisville, KY, United States
| | - Bradford G. Hill
- Department of Medicine, Envirome Institute, Institute of Molecular Cardiology, Diabetes and Obesity Center, Louisville, KY, United States
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