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Dias LG, Reis CHO, Dos Santos L, Krause Neto W, Lima-Leopoldo AP, Baker JS, Leopoldo AS, Bocalini DS. Strength training improves heart function, collagen and strength in rats with heart failure. J Physiol Sci 2024; 74:10. [PMID: 38365576 PMCID: PMC10873996 DOI: 10.1186/s12576-024-00899-3] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Accepted: 01/20/2024] [Indexed: 02/18/2024]
Abstract
BACKGROUND/OBJECTIVES Myocardial infarction (MI) frequently leads to cardiac remodeling and failure with impaired life quality, playing an important role in cardiovascular deaths. Although physical exercise is a well-recognized effective non-pharmacological therapy for cardiovascular diseases, the effects of strength training (ST) on the structural and functional aspects of cardiac remodeling need to be further documented. In this study, we aimed to investigate the role of a linear block ST protocol in the rat model of MI. METHODS AND RESULTS After 6 weeks of MI induction or sham surgery, male adult rats performed ST for the following 12 weeks. The ladder-based ST program was organized in three mesocycles of 4 weeks, with one load increment for each block according to the maximal carrying load test. After 12 weeks, the infarcted-trained rats exhibited an increase in performance, associated with reduced cardiac hypertrophy and pulmonary congestion compared with the untrained group. Despite not changing MI size, the ST program partially prevented cardiac dilatation and ventricular dysfunction assessed by echocardiography and hemodynamics, and interstitial fibrosis evaluated by histology. In addition, isolated cardiac muscles from infarcted-trained rats had improved contractility parameters in a steady state, and in response to calcium or stimuli pauses. CONCLUSIONS The ST in infarcted rats increased the capacity to carry mass, associated with attenuation of cardiac remodeling and pulmonary congestion with improving cardiac function that could be attributed, at least in part, to the improvement of myocardial contractility.
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Affiliation(s)
- Leisiane G Dias
- Experimental Physiology and Biochemistry Laboratory. Physical Education and Sport Center, Federal University of Espirito Santo, Vitoria, Brazil
| | - Carlos H O Reis
- Experimental Physiology and Biochemistry Laboratory. Physical Education and Sport Center, Federal University of Espirito Santo, Vitoria, Brazil
| | - Leonardo Dos Santos
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espirito Santo, Vitoria, Brazil
| | - Walter Krause Neto
- Department of Morphology and Genetics, Federal University of São Paulo, São Paulo, Brazil
| | - Ana Paula Lima-Leopoldo
- Experimental Physiology and Biochemistry Laboratory. Physical Education and Sport Center, Federal University of Espirito Santo, Vitoria, Brazil
| | - Julien S Baker
- Department of Sport, Physical Education and Health, Centre for Health and Exercise Science Research, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - André S Leopoldo
- Experimental Physiology and Biochemistry Laboratory. Physical Education and Sport Center, Federal University of Espirito Santo, Vitoria, Brazil
| | - Danilo S Bocalini
- Experimental Physiology and Biochemistry Laboratory. Physical Education and Sport Center, Federal University of Espirito Santo, Vitoria, Brazil.
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Barbosa WA, Leite CDFC, Reis CHO, Machado AF, Bullo V, Gobbo S, Bergamin M, Lima-Leopoldo AP, Vancini RL, Baker JS, Rica RL, Bocalini DS. Effect of Supervised and Unsupervised Exercise Training in Outdoor Gym on the Lifestyle of Elderly People. Int J Environ Res Public Health 2023; 20:7022. [PMID: 37947578 PMCID: PMC10648151 DOI: 10.3390/ijerph20217022] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/24/2023] [Accepted: 10/31/2023] [Indexed: 11/12/2023]
Abstract
The aim of this study was to investigate the effectiveness of supervised and unsupervised physical training programs using outdoor gym equipment on the lifestyles of elderly people. METHODS physically independent elderly people were randomly distributed into three groups: supervised training (n: 20; ST), unsupervised training (n: 20; UT) and control (n: 20; C). The ST and UT groups completed a 12-week program, with exercises performed three times a week. The ST group underwent weekly 30 min sessions consisting of a 5 min warm-up (walking at 60% of HRmax), followed by 20 sets of 30, "monitored by a metronome with 30" of passive recovery between sets and a five-minute cool-down. The following equipment was used: elliptical, rowing, surfing and leg press. The UT group was instructed to freely attend the gym and train spontaneously using the same equipment used by ST. Lifestyle changes were evaluated using a questionnaire containing specific domains. RESULTS no significant differences were identified in the domains for family, physical activity, nutrition, smoking, sleep, behavior, introspection, work and overall score; however, the values corresponding to the alcohol domain for the ST and UT groups were lower (p < 0.05) than the C group, remaining even lower after the 12 weeks of intervention. Time effect (p < 0.05) was found only in the ST group for the physical domains, sleep, behavior and overall score. CONCLUSION elderly people submitted to supervised and unsupervised physical exercise programs using outdoor gym equipment present positive changes in lifestyle parameters compared to physical inactive elderly people.
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Affiliation(s)
- Welmo A. Barbosa
- Experimental Physiology and Biochemistry Laboratory, Physical Education and Sport Center, Federal University of Espírito Santo, Campus Goiabeiras, Avenida Fernando Ferrari, 514, Goiabeiras, Vitória 29075-910, ES, Brazil (D.S.B.)
- MoveAgeLab, Physical Education and Sport Center, Federal University of Espírito Santo, Vitória 29075-010, ES, Brazil
| | - Carine Danielle F. C. Leite
- Experimental Physiology and Biochemistry Laboratory, Physical Education and Sport Center, Federal University of Espírito Santo, Campus Goiabeiras, Avenida Fernando Ferrari, 514, Goiabeiras, Vitória 29075-910, ES, Brazil (D.S.B.)
| | - Carlos H. O. Reis
- Experimental Physiology and Biochemistry Laboratory, Physical Education and Sport Center, Federal University of Espírito Santo, Campus Goiabeiras, Avenida Fernando Ferrari, 514, Goiabeiras, Vitória 29075-910, ES, Brazil (D.S.B.)
| | - Alexandre F. Machado
- Experimental Physiology and Biochemistry Laboratory, Physical Education and Sport Center, Federal University of Espírito Santo, Campus Goiabeiras, Avenida Fernando Ferrari, 514, Goiabeiras, Vitória 29075-910, ES, Brazil (D.S.B.)
| | - Valentina Bullo
- Department of Medicine, University of Padova, 35122 Padova, Italy
| | - Stefano Gobbo
- Department of Medicine, University of Padova, 35122 Padova, Italy
| | - Marco Bergamin
- Department of Medicine, University of Padova, 35122 Padova, Italy
| | - Ana Paula Lima-Leopoldo
- Experimental Physiology and Biochemistry Laboratory, Physical Education and Sport Center, Federal University of Espírito Santo, Campus Goiabeiras, Avenida Fernando Ferrari, 514, Goiabeiras, Vitória 29075-910, ES, Brazil (D.S.B.)
| | - Rodrigo L. Vancini
- MoveAgeLab, Physical Education and Sport Center, Federal University of Espírito Santo, Vitória 29075-010, ES, Brazil
| | - Julien S. Baker
- Center for Health and Exercise Science Research, Department of Sport, Physical Education and Health, Hong Kong Baptist University, Kowloon Tong 999077, Hong Kong
| | - Roberta L. Rica
- Department of Physical Education, Estacio de Sá University, Vitoria 22640-102, ES, Brazil
| | - Danilo S. Bocalini
- Experimental Physiology and Biochemistry Laboratory, Physical Education and Sport Center, Federal University of Espírito Santo, Campus Goiabeiras, Avenida Fernando Ferrari, 514, Goiabeiras, Vitória 29075-910, ES, Brazil (D.S.B.)
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3
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Cardoso JC, Martins VVP, Madureira AR, Sales ST, Filetti FM, Corrêa CR, Nogueira BV, Lima-Leopoldo AP, Leopoldo AS. A High-Fat Diet Induces Cardiac Damage in Obesity-Resistant Rodents with Reduction in Metabolic Health. Cell Physiol Biochem 2023; 57:264-278. [PMID: 37590499 DOI: 10.33594/000000642] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/26/2023] [Indexed: 08/19/2023] Open
Abstract
BACKGROUND/AIMS Obesity resistance is associated with the complex interaction of stringent and environmental factors that confer the ability to resist mass gain and body fat deposition, even when eating high-calorie diets. Considering that there are numerous gaps in the literature on the metabolic processes that explain Obesity resistance, specifically in relation to oxidative stress, the purpose of the study was to investigate whether obesity-resistant (OR) rats develop elevated reactive oxygen species in cardiac tissue. METHODS Wistar rats were initially randomized into two groups: a standard diet (SD) and a high-fat diet (HFD) group. The SD and HFD groups were further divided into control (C), OR, and obese prone (OP) subgroups based on body weight. This criterion consisted of organizing the animals in each group in ascending order according to body weight (BW), and the cutoff point was identified in the animals by terciles: 1) lower BW; 2) intermediate BW; and 3) higher BW. Rats were sacrificed on the 14th week, and serum and organs were collected. Nutritional assessment, food profiles, histological analysis, comorbidities, and cardiovascular characteristics were determined. RESULTS BW showed a significant difference between the standard diet and high-fat diet groups in the 4th week of the experimental protocol, characterizing obesity. In the 4th week, after the characterization of Obesity resistance, there was a significant difference in BW between groups C, OP, and OR. The OP and OR groups showed a significant increase in caloric intake in relation to the C group. The OP group showed a significant increase in final BW, retroperitoneal fat pad mass, sum of corporal fat deposits and reactive oxygen species, in relation to groups C and OR. The area under the glycemic curve, insulin resistance index and basal glucose were elevated in the OP group in relation to the C. OP also promoted an increase in HOMA-IR when compared with C. OR rats showed a non-significant increase in insulin and HOMA-IR in OR vs. C (p = ~0.1), but no significant differences were observed between OP vs. OR for these parameters, suggesting that both groups suffered from decreased metabolic health. Total cardiac mass, left ventricular cross-sectional area, and cholesterol levels were significantly elevated in the OP and OR groups compared with the C group. CONCLUSION A high-fat diet induces cardiac damage in obesity-resistant rodents with reduction in metabolic health.
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Affiliation(s)
- Janete Corrêa Cardoso
- Postgraduate Program in Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Vinicius Valois Pereira Martins
- Postgraduate Program in Nutrition and Health, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Amanda Rangel Madureira
- Postgraduate Program in Nutrition and Health, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Suellem Torezani Sales
- Postgraduate Program in Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Filipe Martinuzo Filetti
- Postgraduate Program in Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | | | - Breno Valentim Nogueira
- Department of Morphology, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Ana Paula Lima-Leopoldo
- Center for Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - André Soares Leopoldo
- Center for Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil,
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da Silva VL, Mota GAF, de Souza SLB, de Campos DHS, Melo AB, Vileigas DF, Coelho PM, Sant’Ana PG, Padovani C, Lima-Leopoldo AP, Bazan SGZ, Leopoldo AS, Cicogna AC. Aerobic Exercise Training Improves Calcium Handling and Cardiac Function in Rats with Heart Failure Resulting from Aortic Stenosis. Int J Mol Sci 2023; 24:12306. [PMID: 37569680 PMCID: PMC10418739 DOI: 10.3390/ijms241512306] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 07/20/2023] [Accepted: 07/28/2023] [Indexed: 08/13/2023] Open
Abstract
Aerobic exercise training (AET) has been used to manage heart disease. AET may totally or partially restore the activity and/or expression of proteins that regulate calcium (Ca2+) handling, optimize intracellular Ca2+ flow, and attenuate cardiac functional impairment in failing hearts. However, the literature presents conflicting data regarding the effects of AET on Ca2+ transit and cardiac function in rats with heart failure resulting from aortic stenosis (AoS). This study aimed to evaluate the impact of AET on Ca2+ handling and cardiac function in rats with heart failure due to AoS. Wistar rats were distributed into two groups: control (Sham; n = 61) and aortic stenosis (AoS; n = 44). After 18 weeks, the groups were redistributed into: non-exposed to exercise training (Sham, n = 28 and AoS, n = 22) and trained (Sham-ET, n = 33 and AoS-ET, n = 22) for 10 weeks. Treadmill exercise training was performed with a velocity equivalent to the lactate threshold. The cardiac function was analyzed by echocardiogram, isolated papillary muscles, and isolated cardiomyocytes. During assays of isolated papillary muscles and isolated cardiomyocytes, the Ca2+ concentrations were evaluated. The expression of regulatory proteins for diastolic Ca2+ was assessed via Western Blot. AET attenuated the diastolic dysfunction and improved the systolic function. AoS-ET animals presented an enhanced response to post-rest contraction and SERCA2a and L-type Ca2+ channel blockage compared to the AoS. Furthermore, AET was able to improve aspects of the mechanical function and the responsiveness of the myofilaments to the Ca2+ of the AoS-ET animals. AoS animals presented an alteration in the protein expression of SERCA2a and NCX, and AET restored SERCA2a and NCX levels near normal values. Therefore, AET increased SERCA2a activity and myofilament responsiveness to Ca2+ and improved the cellular Ca2+ influx mechanism, attenuating cardiac dysfunction at cellular, tissue, and chamber levels in animals with AoS and heart failure.
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Affiliation(s)
- Vítor Loureiro da Silva
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Botucatu 18618-687, Brazil; (G.A.F.M.); (S.L.B.d.S.); (D.H.S.d.C.); (D.F.V.); (P.G.S.); (S.G.Z.B.); (A.C.C.)
| | - Gustavo Augusto Ferreira Mota
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Botucatu 18618-687, Brazil; (G.A.F.M.); (S.L.B.d.S.); (D.H.S.d.C.); (D.F.V.); (P.G.S.); (S.G.Z.B.); (A.C.C.)
| | - Sérgio Luiz Borges de Souza
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Botucatu 18618-687, Brazil; (G.A.F.M.); (S.L.B.d.S.); (D.H.S.d.C.); (D.F.V.); (P.G.S.); (S.G.Z.B.); (A.C.C.)
| | - Dijon Henrique Salomé de Campos
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Botucatu 18618-687, Brazil; (G.A.F.M.); (S.L.B.d.S.); (D.H.S.d.C.); (D.F.V.); (P.G.S.); (S.G.Z.B.); (A.C.C.)
| | - Alexandre Barroso Melo
- Department of Sports, Federal University of Espirito Santo, Vitória 29075-910, Brazil; alexandre-- (A.B.M.); (P.M.C.); (A.P.L.-L.); (A.S.L.)
| | - Danielle Fernandes Vileigas
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Botucatu 18618-687, Brazil; (G.A.F.M.); (S.L.B.d.S.); (D.H.S.d.C.); (D.F.V.); (P.G.S.); (S.G.Z.B.); (A.C.C.)
| | - Priscila Murucci Coelho
- Department of Sports, Federal University of Espirito Santo, Vitória 29075-910, Brazil; alexandre-- (A.B.M.); (P.M.C.); (A.P.L.-L.); (A.S.L.)
| | - Paula Grippa Sant’Ana
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Botucatu 18618-687, Brazil; (G.A.F.M.); (S.L.B.d.S.); (D.H.S.d.C.); (D.F.V.); (P.G.S.); (S.G.Z.B.); (A.C.C.)
| | - Carlos Padovani
- Department of Biostatistics, Institute of Biosciences, São Paulo State University (UNESP), Botucatu 18618-689, Brazil;
| | - Ana Paula Lima-Leopoldo
- Department of Sports, Federal University of Espirito Santo, Vitória 29075-910, Brazil; alexandre-- (A.B.M.); (P.M.C.); (A.P.L.-L.); (A.S.L.)
| | - Silméia Garcia Zanati Bazan
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Botucatu 18618-687, Brazil; (G.A.F.M.); (S.L.B.d.S.); (D.H.S.d.C.); (D.F.V.); (P.G.S.); (S.G.Z.B.); (A.C.C.)
| | - André Soares Leopoldo
- Department of Sports, Federal University of Espirito Santo, Vitória 29075-910, Brazil; alexandre-- (A.B.M.); (P.M.C.); (A.P.L.-L.); (A.S.L.)
| | - Antonio Carlos Cicogna
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Botucatu 18618-687, Brazil; (G.A.F.M.); (S.L.B.d.S.); (D.H.S.d.C.); (D.F.V.); (P.G.S.); (S.G.Z.B.); (A.C.C.)
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Coelho PM, Simmer LM, da Silva DS, Dos Santos MC, Kitagawa RR, Pezzin MF, Correa CR, Leite JG, Leopoldo AS, Lima-Leopoldo AP. Type 2 diabetes mellitus in obesity promotes prolongation of cardiomyocyte contractile function, impaired Ca 2+ handling and protein carbonylation damage. J Diabetes Complications 2023; 37:108559. [PMID: 37480704 DOI: 10.1016/j.jdiacomp.2023.108559] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 06/26/2023] [Accepted: 07/15/2023] [Indexed: 07/24/2023]
Abstract
AIMS To investigate whether the obesity associated to T2DM presented cardiomyocyte myocardial contractility dysfunction due to damage in Ca2+ handling, concomitantly with increased biomarkers of oxidative stress. METHODS Male Wistar rats were randomized into two groups: control (C): fed with standard diet; and obese (Ob) that fed a saturated high-fat. After the characterization of obesity (12 weeks), the Ob animals were submitted to T2DM induction with a single dose of intraperitoneal (i.p.) injection of streptozotocin (30 mg/kg). Thus, remained Ob rats that were characterized as to the presence (T2DMOb; n = 8) and/or absence (Ob; n = 10) of T2DM. Cardiac remodeling was measured by post-mortem morphological, isolated cardiomyocyte contractile function, as well as by intracellular Ca2+-handling analysis. RESULTS T2DMOb presented a significant reduction of all fat pads, total body fat and adiposity index. T2DMOb group presented a significant increase in protein carbonylation and superoxide dismutase (SOD) activity, respectively. T2DMOb promoted elevations in fractional shortening (15.6 %) and time to 50 % shortening (5.8 %), respectively. Time to 50 % Ca2+ decay was prolonged in T2DMOb, suggesting a possible impairment in Ca2+recapture and/or removal. CONCLUSION Type 2 diabetes mellitus in obesity promotes prolongation of cardiomyocyte contractile function with protein carbonylation damage and impaired Ca2+ handling.
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Affiliation(s)
- Priscila M Coelho
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Luísa M Simmer
- Center of Health Sciences, Department of Integrated Health Education, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Daniel S da Silva
- Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Matheus C Dos Santos
- Postgraduate Program in Physiological Sciences, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Rodrigo R Kitagawa
- Center of Health Sciences, Department of Pharmaceutical Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Mateus F Pezzin
- Center of Health Sciences, Department of Pharmaceutical Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Camila R Correa
- Medical School, Botucatu, São Paulo State University (UNESP), Brazil
| | - Jéssica G Leite
- Medical School, Botucatu, São Paulo State University (UNESP), Brazil
| | - André S Leopoldo
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil; Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil; Postgraduate Program in Physiological Sciences, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Ana Paula Lima-Leopoldo
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil; Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil.
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6
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Kobi JBBS, Matias AM, Gasparini PVF, Torezani-Sales S, Madureira AR, da Silva DS, Correa CR, Garcia JL, Haese D, Nogueira BV, de Assis ALEM, Lima-Leopoldo AP, Leopoldo AS. High-fat, high-sucrose, and combined high-fat/high-sucrose diets effects in oxidative stress and inflammation in male rats under presence or absence of obesity. Physiol Rep 2023; 11:e15635. [PMID: 37032431 PMCID: PMC10083166 DOI: 10.14814/phy2.15635] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 02/12/2023] [Accepted: 02/16/2023] [Indexed: 04/11/2023] Open
Abstract
The study examines the influence of three types of hypercaloric diets on metabolic parameters, inflammatory markers, and oxidative stress in experimental model. Male Wistar rats (n = 40) were randomized in control (C), high-sucrose (HS), high-fat (HF), and high-fat with sucrose (HFHS) for 20 weeks. Nutritional, metabolic, hormonal, and biochemical profiles, as well as histological analysis of adipose and hepatic tissues were performed. Inflammation and oxidative stress were determined. HF model caused obesity and comorbidities as glucose intolerance and arterial hypertension. In relation to hormonal and biochemical parameters, there was no significant difference between the groups. All groups showed increased deposition of fat droplets in the hepatic tissue, even though adipocyte areas were similar. Biomarkers of oxidative stress in serum and adipose tissues were similar among the groups. HF model was effective in triggering associated obesity and comorbidities in male rats, but all hypercaloric diets were unable to promote oxidative stress and inflammation.
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Affiliation(s)
| | - Amanda Martins Matias
- Postgraduate Program in Nutrition and Health, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | | | - Suellem Torezani-Sales
- Postgraduate Program in Physiological Science, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Amanda Rangel Madureira
- Postgraduate Program in Nutrition and Health, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Daniel Sesana da Silva
- Postgraduate Program in Physical Education, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | | | | | - Douglas Haese
- University of Vila Velha, Vila Velha, Espírito Santo, Brazil
| | - Breno Valentim Nogueira
- Department of Morphology, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | | | - Ana Paula Lima-Leopoldo
- Postgraduate Program in Nutrition and Health, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
- Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - André Soares Leopoldo
- Postgraduate Program in Nutrition and Health, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
- Postgraduate Program in Physiological Science, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
- Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
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Silva VLD, Nunes RDL, Pereira CCA, Lima-Leopoldo AP, Lunz W, Vancini RL, Leopoldo AS. Knowledge about first aid among physical education professionals outside school settings. Sustinere 2022. [DOI: 10.12957/sustinere.2022.45333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Gasparini PVF, Matias AM, Torezani-Sales S, Kobi JBBS, Siqueira JS, Corrêa CR, Lima-Leopoldo AP, Leopoldo AS. High-Fat and Combined High-Fat and Sucrose Diets Promote Cardiac Oxidative Stress Independent of Nox2 Redox Regulation and Obesity in Rats. Cell Physiol Biochem 2021; 55:618-634. [PMID: 34705355 DOI: 10.33594/000000441] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/08/2021] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND/AIMS Oxidative stress is associated with cardiometabolic alterations, and the involvement of excess glucose and fatty acids has been demonstrated in this process. Thus, the aim of this study was to investigate the effects of different hypercaloric diets on cardiac oxidative stress. METHODS Wistar rats were randomized into four groups: control (C), high-sucrose (HS), high-fat (HF), and high-fat with sucrose (HFS). Nutritional assessment, food profiles, histological analysis, comorbidities, and cardiovascular characteristics were determined. Cardiac oxidative stress was analyzed by malondialdehyde (MDA) and carbonylated proteins, and the cardiac protein expression levels of type 1 angiotensin receptor (AT-1), nicotinamide adenine dinucleotide phosphate oxidase 2 (Nox2), superoxide dismutase (SOD 1 e 2), glutathione peroxidase (GPX), and catalase (CAT) were determined by western blot. RESULTS The HF group showed an increase in adiposity; however, it did not present adipocyte hypertrophy and comorbidities. Cardiac MDA and carbonylated protein levels were higher in the HF and HFS compared with the C group. The levels of oxidant and antioxidant proteins showed no difference between the groups. CONCLUSION HF and HFS dietary interventions promoted cardiac oxidative stress, in the presence and absence of obesity, respectively. However, this process was neither mediated by the pro-oxidants AT1 and Nox2, nor by the quantitative reduction of antioxidant enzymes.
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Affiliation(s)
| | - Amanda Martins Matias
- Postgraduate Program in Nutrition and Health, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Suellem Torezani-Sales
- Postgraduate Program in Nutrition and Health, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | | | | | | | - Ana Paula Lima-Leopoldo
- Postgraduate Program in Nutrition and Health, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
- Center for Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - André Soares Leopoldo
- Postgraduate Program in Nutrition and Health, Health Sciences Center, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil,
- Center for Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
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9
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Cordeiro JP, Silva VLD, Campos DH, Cicogna AC, Leopoldo AS, Lima-Leopoldo AP. Isolated obesity resistance condition or associated with aerobic exercise training does not promote cardiac impairment. ACTA ACUST UNITED AC 2021; 54:e10669. [PMID: 34287576 PMCID: PMC8289349 DOI: 10.1590/1414-431x2020e10669] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 05/28/2021] [Indexed: 11/30/2022]
Abstract
Mechanisms involved in cardiac function and calcium (Ca2+) handling in obese-resistant (OR) rats are still poorly determined. We tested the hypothesis that unsaturated high-fat diet (HFD) promotes myocardial dysfunction in OR rats, which it is related to Ca2+ handling. In addition, we questioned whether exercise training (ET) becomes a therapeutic strategy. Male Wistar rats (n=80) were randomized to standard or HFD diets for 20 weeks. The rats were redistributed for the absence or presence of ET and OR: control (C; n=12), control + ET (CET; n=14), obese-resistant (OR; n=9), and obese-resistant + ET (ORET; n=10). Trained rats were subjected to aerobic training protocol with progressive intensity (55-70% of the maximum running speed) and duration (15 to 60 min/day) for 12 weeks. Nutritional, metabolic, and cardiovascular parameters were determined. Cardiac function and Ca2+ handling tests were performed in isolated left ventricle (LV) papillary muscle. OR rats showed cardiac atrophy with reduced collagen levels, but there was myocardial dysfunction. ET was efficient in improving most parameters of body composition. However, the mechanical properties and Ca2+ handling from isolated papillary muscle were similar among groups. Aerobic ET does not promote morphological and cardiac functional adaptation under the condition of OR.
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Affiliation(s)
- J P Cordeiro
- Programa de Pós-Graduação em Educação Física, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - V L da Silva
- Departamento de Clínica Médica, Faculdade de Medicina de Botucatu, Universidade Estadual Paulista, Botucatu, SP, Brasil
| | - D H Campos
- Departamento de Clínica Médica, Faculdade de Medicina de Botucatu, Universidade Estadual Paulista, Botucatu, SP, Brasil
| | - A C Cicogna
- Departamento de Clínica Médica, Faculdade de Medicina de Botucatu, Universidade Estadual Paulista, Botucatu, SP, Brasil
| | - A S Leopoldo
- Programa de Pós-Graduação em Educação Física, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - A P Lima-Leopoldo
- Programa de Pós-Graduação em Educação Física, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
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10
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Abreu GV, Claudio ERG, Aguiar AF, Giordani MA, de Queiroz EAIF, Lima-Leopoldo AP, Leopoldo AS, Sugizaki MM. Digoxin Combined with Aerobic Interval Training Improved Cardiomyocyte Contractility. Int J Sports Med 2020; 42:694-702. [PMID: 33321522 DOI: 10.1055/a-1300-2583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Digoxin is a cardiotonic that increases the cardiac output without causing deleterious effects on heart, as well as improves the left ventricular performance during physical exercise. We tested whether the association between chronic digoxin administration and aerobic interval training (AIT) promotes beneficial cardiovascular adaptations by improving the myocardial contractility and calcium (Ca2+) handling. Male Wistar rats were randomly assigned to sedentary control (C), interval training (T), sedentary digoxin (DIGO) and T associated to digoxin (TDIGO). AIT was performed on a treadmill (1h/day, 5 days/week) for 60 days, consisting of successive 8-min periods at 80% and 20% of VO2máx for 2 min. Digoxin was administered by orogastric gavage for 60 days. Left ventricle samples were collected to analysis of Ca2+ handling proteins; contractility and Ca2+ handling were performed on isolated cardiomyocytes. TDIGO group had a greater elevation in fractional shortening (44%) than DIGO, suggesting a cardiomyocyte contractile improvement. In addition, T or TDIGO groups showed no change in cardiomyocytes properties after Fura2-acetoxymethyl ester, as well as in sarcoplasmic reticulum Ca2+-ATPase (SERCA2a), phospholamban and calcineurin expressions. The main findings indicate that association of digoxin and aerobic interval training improved the cardiomyocyte contractile function, but these effects seem to be unrelated to Ca2+ handling.
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Affiliation(s)
- Gabriel Vasconcelos Abreu
- Laboratory of Metabolic and Cardiovascular Diseases, Health Education and Research Center (NUPADS), Institute of Health Science, Federal University of Mato Grosso, Sinop, Brazil
| | - Erick Roberto Gonçalves Claudio
- Center of Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Andreo Fernando Aguiar
- North University of Paraná (UNOPAR), Centre of Research in Biological and Healthy Sciences, Londrina, Paraná, Brazil
| | - Morenna Alana Giordani
- Laboratory of Metabolic and Cardiovascular Diseases, Health Education and Research Center (NUPADS), Institute of Health Science, Federal University of Mato Grosso, Sinop, Brazil
| | | | - Ana Paula Lima-Leopoldo
- Center of Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - André Soares Leopoldo
- Center of Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Mário Mateus Sugizaki
- Laboratory of Metabolic and Cardiovascular Diseases, Health Education and Research Center (NUPADS), Institute of Health Science, Federal University of Mato Grosso, Sinop, Brazil
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11
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Luchi TC, Coelho PM, Cordeiro JP, Assis ALEM, Nogueira BV, Marques VB, Dos Santos L, Lima-Leopoldo AP, Lunz W, Leopoldo AS. Chronic aerobic exercise associated to low-dose L-NAME improves contractility without changing calcium handling in rat cardiomyocytes. ACTA ACUST UNITED AC 2020; 53:e8761. [PMID: 32159612 PMCID: PMC7076801 DOI: 10.1590/1414-431x20198761] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Accepted: 12/11/2019] [Indexed: 11/22/2022]
Abstract
Nitric oxide (NO) inhibition by high-dose NG-nitro-L-arginine methyl ester (L-NAME) is associated with several detrimental effects on the cardiovascular system. However, low-dose L-NAME increases NO synthesis, which in turn induces physiological cardiovascular benefits, probably by activating a protective negative feedback mechanism. Aerobic exercise, likewise, improves several cardiovascular functions in healthy hearts, but its effects are not known when chronically associated with low-dose L-NAME. Thus, we tested whether the association between low-dose L-NAME administration and chronic aerobic exercise promotes beneficial effects to the cardiovascular system, evaluating the cardiac remodeling process. Male Wistar rats were randomly assigned to control (C), L-NAME (L), chronic aerobic exercise (Ex), and chronic aerobic exercise associated to L-NAME (ExL). Aerobic training was performed with progressive intensity for 12 weeks; L-NAME (1.5 mg·kg-1·day-1) was administered by orogastric gavage. Low-dose L-NAME alone did not change systolic blood pressure (SBP), but ExL significantly increased SBP at week 8 with normalization after 12 weeks. Furthermore, ExL promoted the elevation of left ventricle (LV) end-diastolic pressure without the presence of cardiac hypertrophy and fibrosis. Time to 50% shortening and relaxation were reduced in ExL, suggesting a cardiomyocyte contractile improvement. In addition, the time to 50% Ca2+ peak was increased without alterations in Ca2+ amplitude and time to 50% Ca2+ decay. In conclusion, the association of chronic aerobic exercise and low-dose L-NAME prevented cardiac pathological remodeling and induced cardiomyocyte contractile function improvement; however, it did not alter myocyte affinity and sensitivity to intracellular Ca2+ handling.
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Affiliation(s)
- T C Luchi
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - P M Coelho
- Programa de Pós-Graduação em Nutrição e Saúde, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - J P Cordeiro
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - A L E M Assis
- Departamento de Morfologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - B V Nogueira
- Departamento de Morfologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - V B Marques
- Departamento de Ciências Fisiológicas, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - L Dos Santos
- Departamento de Ciências Fisiológicas, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - A P Lima-Leopoldo
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brasil.,Programa de Pós-Graduação em Nutrição e Saúde, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - W Lunz
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - A S Leopoldo
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brasil.,Programa de Pós-Graduação em Nutrição e Saúde, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
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12
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Martins Matias A, Murucci Coelho P, Bermond Marques V, dos Santos L, Monteiro de Assis ALE, Valentim Nogueira B, Lima-Leopoldo AP, Soares Leopoldo A. Hypercaloric diet models do not develop heart failure, but the excess sucrose promotes contractility dysfunction. PLoS One 2020; 15:e0228860. [PMID: 32032383 PMCID: PMC7006916 DOI: 10.1371/journal.pone.0228860] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 01/25/2020] [Indexed: 12/04/2022] Open
Abstract
Several diseases are associated with excess of adipose tissue, and obesity is considered an independent risk factor for the development of cardiac remodeling and heart failure. Dietary aspects have been studied to elucidate the mechanisms involved in these processes. Thus, the purpose was the development and characterization of an obesity experimental model from hypercaloric diets, which resulted in cardiac remodeling and predisposition to heart failure. Thirty- day-old male Wistar rats (n = 52) were randomized into four groups: control (C), high sucrose (HS), high-fat (HF) and high-fat and sucrose (HFHS) for 20 weeks. General characteristics, comorbidities, weights of the heart, left (LV) and right ventricles, atrium, and relationships with the tibia length were evaluated. The LV myocyte cross sectional area and fraction of interstitial collagen were assayed. Cardiac function was determined by hemodynamic analysis and the contractility by cardiomyocyte contractile function. Heart failure was analyzed by pulmonary congestion, right ventricular hypertrophy, and hemodynamic parameters. HF and HFHS models led to obesity by increase in adiposity index (C = 8.3 ± 0.2% vs. HF = 10.9 ± 0.5%, HFHS = 10.2 ± 0.3%). There was no change in the morphological parameters and heart failure signals. HF and HFHS caused a reduction in times to 50% relaxation without cardiomyocyte contractile damage. The HS model presented cardiomyocyte contractile dysfunction visualized by lower shortening (C: 8.34 ± 0.32% vs. HS: 6.91 ± 0.28), as well as the Ca2+ transient amplitude was also increased when compared to HFHS. In conclusion, the experimental diets based on high amounts of sugar, lard or a combination of both did not promote cardiac remodeling with predisposition to heart failure under conditions of obesity or excess sucrose. Nevertheless, excess sucrose causes cardiomyocyte contractility dysfunction associated with alterations in the myocyte sensitivity to intracellular Ca2+.
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Affiliation(s)
- Amanda Martins Matias
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Priscila Murucci Coelho
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Vinícius Bermond Marques
- Center of Health Sciences, Department of Physiological Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Leonardo dos Santos
- Center of Health Sciences, Department of Physiological Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | | | - Breno Valentim Nogueira
- Center of Health Sciences, Department of Morphology, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Ana Paula Lima-Leopoldo
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
- Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - André Soares Leopoldo
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
- Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
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13
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Melo AB, Damiani APL, Coelho PM, de Assis ALEM, Nogueira BV, Guimarães Ferreira L, Leite RD, Ribeiro Júnior RF, Lima-Leopoldo AP, Leopoldo AS. Resistance training promotes reduction in Visceral Adiposity without improvements in Cardiomyocyte Contractility and Calcium handling in Obese Rats. Int J Med Sci 2020; 17:1819-1832. [PMID: 32714085 PMCID: PMC7378665 DOI: 10.7150/ijms.42612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Accepted: 03/23/2020] [Indexed: 11/05/2022] Open
Abstract
Resistance training (RT) improves the cardiomyocyte calcium (Ca2+) cycling during excitation-contraction coupling. However, the role of RT in cardiomyocyte contractile function associated with Ca2+ handling in obesity is unclear. Wistar rats were distributed into four groups: control, sedentary obese, control plus RT, and obesity plus RT. The 10-wk RT protocol was used (4-5 vertical ladder climbs, 60-second interval, 3× a week, 50-100% of maximum load). Metabolic, hormonal, cardiovascular and biochemical parameters were determined. Reduced leptin levels, epididymal, retroperitoneal and visceral fat pads, lower body fat, and adiposity index were observed in RT. Obesity promoted elevation of collagen, but RT did not promote modifications of LV collagen in ObRT. RT induced elevation in maximum rates of contraction and relaxation, and reduction of time to 50% relaxation. ObRT group did not present improvement in the cardiomyocyte contractile function in comparison to Ob group. Reduced cardiac PLB serine16 phosphorylation (pPLB Ser16) and pPLB Ser16/PLB ratio with no alterations in sarcoplasmic reticulum Ca2+ ATPase (SERCA2a) and phospholamban (PLB) expression were observed in Ob groups. Resistance training improved body composition reduced fat pads and plasma leptin levels but did not promote positive alterations in cardiomyocyte contractile function, Ca2+ handling and phospholamban phosphorylation.
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Affiliation(s)
- Alexandre Barroso Melo
- Centre for Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Andressa Prata Leite Damiani
- Centre for Health Sciences, Department of Nutrition, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Priscila Murucci Coelho
- Centre for Health Sciences, Department of Nutrition, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | | | - Breno Valentim Nogueira
- Center of Health Sciences, Department of Morphology, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Lucas Guimarães Ferreira
- Centre for Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Richard Diego Leite
- Centre for Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Rogério Faustino Ribeiro Júnior
- Center of Health Sciences, Department of Physiological Sciences, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Ana Paula Lima-Leopoldo
- Centre for Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - André Soares Leopoldo
- Centre for Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
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14
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Deus AFD, Silva VLD, de Souza SLB, Mota GAF, Sant'Ana PG, Vileigas DF, Lima-Leopoldo AP, Leopoldo AS, Campos DHSD, de Tomasi LC, Padovani CR, Kolwicz SC, Cicogna AC. Myocardial Dysfunction after Severe Food Restriction Is Linked to Changes in the Calcium-Handling Properties in Rats. Nutrients 2019; 11:nu11091985. [PMID: 31443528 PMCID: PMC6770438 DOI: 10.3390/nu11091985] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 08/09/2019] [Accepted: 08/14/2019] [Indexed: 12/13/2022] Open
Abstract
Severe food restriction (FR) impairs cardiac performance, although the causative mechanisms remain elusive. Since proteins associated with calcium handling may contribute to cardiac dysfunction, this study aimed to evaluate whether severe FR results in alterations in the expression and activity of Ca2+-handling proteins that contribute to impaired myocardial performance. Male 60-day-old Wistar–Kyoto rats were fed a control or restricted diet (50% reduction in the food consumed by the control group) for 90 days. Body weight, body fat pads, adiposity index, as well as the weights of the soleus muscle and lung, were obtained. Cardiac remodeling was assessed by morphological measures. The myocardial contractile performance was analyzed in isolated papillary muscles during the administration of extracellular Ca2+ and in the absence or presence of a sarcoplasmic reticulum Ca2+-ATPase (SERCA2a) specific blocker. The expression of Ca2+-handling regulatory proteins was analyzed via Western Blot. Severe FR resulted in a 50% decrease in body weight and adiposity measures. Cardiac morphometry was substantially altered, as heart weights were nearly twofold lower in FR rats. Papillary muscles isolated from FR hearts displayed mechanical dysfunction, including decreased developed tension and reduced contractility and relaxation. The administration of a SERCA2a blocker led to further decrements in contractile function in FR hearts, suggesting impaired SERCA2a activity. Moreover, the FR rats presented a lower expression of L-type Ca2+ channels. Therefore, myocardial dysfunction induced by severe food restriction is associated with changes in the calcium-handling properties in rats.
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Affiliation(s)
- Adriana Fernandes de Deus
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University, Botucatu 18618687, Brazil
| | - Vítor Loureiro da Silva
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University, Botucatu 18618687, Brazil
| | - Sérgio Luiz Borges de Souza
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University, Botucatu 18618687, Brazil
| | | | - Paula Grippa Sant'Ana
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University, Botucatu 18618687, Brazil
| | - Danielle Fernandes Vileigas
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University, Botucatu 18618687, Brazil
| | - Ana Paula Lima-Leopoldo
- Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória 29075-910, Brazil
| | - André Soares Leopoldo
- Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória 29075-910, Brazil
| | | | - Loreta Casquel de Tomasi
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University, Botucatu 18618687, Brazil
| | - Carlos Roberto Padovani
- Department of Biostatistics, Institute of Biosciences, São Paulo State University, Botucatu 18618970, Brazil
| | - Stephen C Kolwicz
- Department of Health and Exercise Physiology, Ursinus College, Collegeville, PA 19426, USA
| | - Antonio Carlos Cicogna
- Department of Internal Medicine, Botucatu Medical School, São Paulo State University, Botucatu 18618687, Brazil.
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15
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Rocha VDS, Claudio ERG, da Silva VL, Cordeiro JP, Domingos LF, da Cunha MRH, Mauad H, do Nascimento TB, Lima-Leopoldo AP, Leopoldo AS. High-Fat Diet-Induced Obesity Model Does Not Promote Endothelial Dysfunction via Increasing Leptin/Akt/eNOS Signaling. Front Physiol 2019; 10:268. [PMID: 30949067 PMCID: PMC6435481 DOI: 10.3389/fphys.2019.00268] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 02/28/2019] [Indexed: 12/23/2022] Open
Abstract
Experimental studies show that the unsaturated high-fat diet-induced obesity promotes vascular alterations characterized by improving the endothelial L-arginine/Nitric Oxide (NO) pathway. Leptin seems to be involved in this process, promoting vasodilation via increasing NO bioavailability. The aim of this study was to test the hypothesis that unsaturated high-fat diet-induced obesity does not generate endothelial dysfunction via increasing the vascular leptin/Akt/eNOS signaling. Thirty-day-old male Wistar rats were randomized into two groups: control (C) and obese (Ob). Group C was fed a standard diet, while group Ob was fed an unsaturated high-fat diet for 27 weeks. Adiposity, hormonal and biochemical parameters, and systolic blood pressure were observed. Concentration response curves were performed for leptin or acetylcholine in the presence or absence of Akt and NOS inhibitor. Our results showed that an unsaturated high-fat diet promoted a greater feed efficiency (FE), elevation of body weight and body fat (BF), and an adiposity index, characterizing a model of obesity. However, comorbidities frequently associated with experimental obesity were not visualized, such as glucose intolerance, dyslipidemia and hypertension. The evaluation of the endothelium-dependent relaxation with acetylcholine showed no differences between the C and Ob rats. After NOS inhibition, the response was completely abolished in the Ob group, but not in the C group. Furthermore, Akt inhibition completely blunted vascular relaxation in the C group, but not in the Ob group, which was more sensitive to leptin-induced vascular relaxation. L-NAME incubation abolished the relaxation in both groups at the same level. Although Akt inhibitor pre-incubation reduced the leptin response, group C was more sensitive to its effect. In conclusion, the high-unsaturated fat diet-induced obesity improved the vascular reactivity to leptin and does not generate endothelial dysfunction, possibly by the increase in the vascular sensitivity to leptin and increasing NO bioavailability. Moreover, our results suggest that the increase in NO production occurs through the increase in NOS activation by leptin and is partially mediated by the Akt pathway.
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Affiliation(s)
- Vanessa da Silva Rocha
- Physiology and Biochemistry Laboratory, Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Brazil
| | | | - Vitor Loureiro da Silva
- Physiology and Biochemistry Laboratory, Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Brazil
| | - Jóctan Pimentel Cordeiro
- Physiology and Biochemistry Laboratory, Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Brazil
| | - Lucas Furtado Domingos
- Physiology and Biochemistry Laboratory, Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Brazil
| | - Márcia Regina Holanda da Cunha
- Physiology and Biochemistry Laboratory, Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Brazil
| | - Helder Mauad
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | | | - Ana Paula Lima-Leopoldo
- Physiology and Biochemistry Laboratory, Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Brazil
| | - André Soares Leopoldo
- Physiology and Biochemistry Laboratory, Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória, Brazil
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16
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Matias AM, Estevam WM, Coelho PM, Haese D, Kobi JBBS, Lima-Leopoldo AP, Leopoldo AS. Differential Effects of High Sugar, High Lard or a Combination of Both on Nutritional, Hormonal and Cardiovascular Metabolic Profiles of Rodents. Nutrients 2018; 10:E1071. [PMID: 30103515 PMCID: PMC6116051 DOI: 10.3390/nu10081071] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Revised: 08/03/2018] [Accepted: 08/08/2018] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Dietary interventions in rodents can induce an excess of adipose tissue and metabolic disorders that resemble human obesity. Nevertheless, these approaches are not standardized, and the phenotypes may vary distinctly among studies. The aim of this study was to investigate the effects of different dietary interventions on nutritional, metabolic, biochemical, hormonal, and cardiovascular profiles, as well as to add to development and characterization of an experimental model of obesity. METHODS Male Wistar rats were randomized into four groups: control diet (C), high-sugar (HS), high-fat (HF), or high-sugar and high-fat (HFHS). Weekly measurements of body weight, adiposity, area under the curve (AUC) for glucose, blood pressure (BP) and serum triglycerides, total cholesterol level, and leptin were performed. RESULTS HF and HFHS models were led to obesity by increases in adipose tissue deposition and the adiposity index. All hypercaloric diets presented systolic BP increases. In addition, the AUC for glucose was greater in HF and HFHS than in C, and only the HF group presented hyperleptinemia. CONCLUSIONS HF and HFHS diet approaches promote obesity and comorbidities, and thus represent a useful tool for studying human obesity-related disorders. By contrast, the HS model did not prove to be a good model of obesity.
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Affiliation(s)
- Amanda Martins Matias
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória 29075-910, Espírito Santo, Brazil.
| | - Wagner Müller Estevam
- Postgraduate Program in Physical Education, Center of Physical Education and Sports, Federal University of Espírito Santo (UFES), Vitória 29075-910, Espírito Santo, Brazil.
| | - Priscila Murucci Coelho
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória 29075-910, Espírito Santo, Brazil.
| | - Douglas Haese
- University of Vila Velha, Vila Velha 29102-920, Espírito Santo, Brazil.
| | - Jéssika Butcovsky Botto Sarter Kobi
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória 29075-910, Espírito Santo, Brazil.
| | - Ana Paula Lima-Leopoldo
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória 29075-910, Espírito Santo, Brazil.
- Postgraduate Program in Physical Education, Center of Physical Education and Sports, Federal University of Espírito Santo (UFES), Vitória 29075-910, Espírito Santo, Brazil.
- Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória 29075-910, Espírito Santo, Brazil.
| | - André Soares Leopoldo
- Postgraduate Program in Nutrition and Health, Center of Health Sciences, Federal University of Espírito Santo, Vitória 29075-910, Espírito Santo, Brazil.
- Postgraduate Program in Physical Education, Center of Physical Education and Sports, Federal University of Espírito Santo (UFES), Vitória 29075-910, Espírito Santo, Brazil.
- Department of Sports, Center of Physical Education and Sports, Federal University of Espírito Santo, Vitória 29075-910, Espírito Santo, Brazil.
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Neves CH, Aguiar AF, Aguiar DH, Leopoldo AS, Lima-Leopoldo AP, Voltarelli FA, Lourenço FJ, Sugizaki MM. DIGOXINA E VERAPAMIL INDUZEM HIPERTROFIA EM CARDIOMIÓCITOS DE RATOS SEDENTÁRIOS E/OU TREINADOS. REV BRAS MED ESPORTE 2016. [DOI: 10.1590/1517-869220162205152114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
RESUMO Introdução: Cardiotônicos e bloqueadores de canais de cálcio são fármacos que alteram o Ca2+ intracelular e afetam o coração. Objetivo: Avaliar os efeitos da administração de verapamil e digoxina sobre a morfologia cardíaca de ratos submetidos ao treinamento intervalado (TAI). Métodos: Ratos Wistar machos divididos em seis grupos (N = 8): Controle, Digoxina (30,0 µg.kg-1/dia), Verapamil (5,0 mg.kg-1/dia), Treinado, Treinado+digoxina e Treinado+verapamil. O TAI foi realizado em esteira rolante (60 min/dia/60 dias) concomitantemente com a administração dos fármacos. Fragmentos do ventrículo esquerdo (VE) foram coletados para análise histológica. Resultados: A digoxina e o verapamil aumentaram a área total do VE (p < 0,002), capilares/área VE (p < 0,01) e área de cardiomiócitos (p < 2,8e-10), sendo que, nesta última variável, o verapamil promoveu efeito ainda maior que a digoxina. O TAI aumentou VE/PC (p < 4e-05), o diâmetro interno do VE (p < 2,7e-6), a área de cardiomiócitos (p < 1,8e-6) e reduziu o [Lac] (p < 2,6e-5). Houve interação entre TAI e fármacos na área total (p < 9,8e-5), capilares (p < 0,04), células/área (p < 0,004) e área de cardiomiócitos (p < 2e-16). Conclusão: A digoxina promoveu hipertrofia de cardiomiócitos e, quando associada ao TAI, potencializou a hipertrofia. O verapamil foi mais eficiente em aumentar a área de cardiomiócitos em comparação com a digoxina, porém somente de forma isolada.
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Leopoldo AS, Lima-Leopoldo AP, Nascimento AF, Luvizotto RAM, Sugizaki MM, Campos DHS, da Silva DCT, Padovani CR, Cicogna AC. Classification of different degrees of adiposity in sedentary rats. Braz J Med Biol Res 2016; 49:e5028. [PMID: 26909787 PMCID: PMC4792506 DOI: 10.1590/1414-431x20155028] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 11/17/2015] [Indexed: 01/23/2023] Open
Abstract
In experimental studies, several parameters, such as body weight, body mass index,
adiposity index, and dual-energy X-ray absorptiometry, have commonly been used to
demonstrate increased adiposity and investigate the mechanisms underlying obesity and
sedentary lifestyles. However, these investigations have not classified the degree of
adiposity nor defined adiposity categories for rats, such as normal, overweight, and
obese. The aim of the study was to characterize the degree of adiposity in rats fed a
high-fat diet using cluster analysis and to create adiposity intervals in an
experimental model of obesity. Thirty-day-old male Wistar rats were fed a normal
(n=41) or a high-fat (n=43) diet for 15 weeks. Obesity was defined based on the
adiposity index; and the degree of adiposity was evaluated using cluster analysis.
Cluster analysis allowed the rats to be classified into two groups (overweight and
obese). The obese group displayed significantly higher total body fat and a higher
adiposity index compared with those of the overweight group. No differences in
systolic blood pressure or nonesterified fatty acid, glucose, total cholesterol, or
triglyceride levels were observed between the obese and overweight groups. The
adiposity index of the obese group was positively correlated with final body weight,
total body fat, and leptin levels. Despite the classification of sedentary rats into
overweight and obese groups, it was not possible to identify differences in the
comorbidities between the two groups.
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Affiliation(s)
- A S Leopoldo
- Departamento de Desportos, Centro de Educação Física e Esportes, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - A P Lima-Leopoldo
- Departamento de Desportos, Centro de Educação Física e Esportes, Universidade Federal do Espírito Santo, Vitória, ES, Brasil
| | - A F Nascimento
- Instituto de Ciências da Saúde, Universidade Federal do Mato Grosso, Sinop, MT, Brasil
| | - R A M Luvizotto
- Instituto de Ciências da Saúde, Universidade Federal do Mato Grosso, Sinop, MT, Brasil
| | - M M Sugizaki
- Instituto de Ciências da Saúde, Universidade Federal do Mato Grosso, Sinop, MT, Brasil
| | - D H S Campos
- Departamento de Clínica Médica, Faculdade de Medicina, Universidade Estadual Paulista, Botucatu, SP, Brasil
| | - D C T da Silva
- Departamento de Clínica Médica, Faculdade de Medicina, Universidade Estadual Paulista, Botucatu, SP, Brasil
| | - C R Padovani
- Departamento de Bioestatística, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, SP, Brasil
| | - A C Cicogna
- Departamento de Clínica Médica, Faculdade de Medicina, Universidade Estadual Paulista, Botucatu, SP, Brasil
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Cordeiro JP, Dalmaso SB, Anceschi SA, Sá FGDSD, Ferreira LG, Cunha MRHD, Leopoldo AS, Lima-Leopoldo AP. HIPERTENSÃO EM ESTUDANTES DA REDE PÚBLICA DE VITÓRIA/ES: INFLUÊNCIA DO SOBREPESO E OBESIDADE. REV BRAS MED ESPORTE 2016. [DOI: 10.1590/1517-869220162201134305] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
RESUMO Introdução: Pesquisas demonstram que a obesidade pode ter início na infância. Além disso, o excesso de peso presente em 50% na infância é fator preditor da obesidade na vida adulta. As consequências são preocupantes pela associação com diversas comorbidades, entre elas, a hipertensão arterial. Estudos mostram que crianças obesas apresentam risco superior de hipertensão arterial em relação às não obesas. Objetivo: Identificar a prevalência de hipertensão arterial e sua relação com o sobrepeso e obesidade em crianças e adolescentes estudantes da rede pública do município de Vitória, ES, Brasil. Foram estudados 477 alunos, com idade entre 7 e 17 anos, sendo 42,56% e 57,44% dos gêneros masculino e feminino, respectivamente, selecionados por meio de amostragem estratificada por conglomerados . Métodos: Na análise do perfil antropométrico foram utilizados: percentual de gordura por meio de medida de dobras cutâneas e índice de massa corporal (IMC). Além disso, foi realizada aferição da pressão arterial para classificação da hipertensão arterial. Resultados: Os resultados mostram nos estudantes de Vitória, ES, com sobrepeso, valores pressóricos elevados (limítrofes e hipertensos 1 e 2), representando nos gêneros masculino e feminino 21,1% (PAS: 112 ± 10,4 mmHg e PAD: 65,6 ± 8,91 mmHg) e 19,2% (PAS: 108 ± 12,1 mmHg e PAD: 65,6 ± 8,90 mmHg), respectivamente. No entanto, nos estudantes obesos, a prevalência foi maior, abrangendo 26,3% (PAS: 113 ± 11,3 mmHg e PAD: 67,8 ± 10,1 mmHg) no gêneros masculino e 25% (PAS: 108 ± 14,4 mmHg e PAD: 68,3 ± 10,2 mmHg) no feminino. Conclusão: Os achados relatados neste estudo mostram altos índices de crianças e adolescentes acometidos tanto por excesso de peso quanto pela hipertensão arterial. Estes resultados sugerem a implementação de medidas preventivas e de tratamento dos fatores de risco cardiovascular em crianças e adolescentes do município de Vitória, ES.
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Sá FGDSD, Lima-Leopoldo AP, Jacobsen BB, Ferron AJT, Estevam WM, Campos DHS, Castardeli E, Cunha MRHD, Cicogna AC, Leopoldo AS. Obesity Resistance Promotes Mild Contractile Dysfunction Associated with Intracellular Ca2+ Handling. Arq Bras Cardiol 2015; 105:588-96. [PMID: 26761369 PMCID: PMC4693663 DOI: 10.5935/abc.20150134] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 07/28/2015] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Diet-induced obesity is frequently used to demonstrate cardiac dysfunction. However, some rats, like humans, are susceptible to developing an obesity phenotype, whereas others are resistant to that. OBJECTIVE To evaluate the association between obesity resistance and cardiac function, and the impact of obesity resistance on calcium handling. METHODS Thirty-day-old male Wistar rats were distributed into two groups, each with 54 animals: control (C; standard diet) and obese (four palatable high-fat diets) for 15 weeks. After the experimental protocol, rats consuming the high-fat diets were classified according to the adiposity index and subdivided into obesity-prone (OP) and obesity-resistant (OR). Nutritional profile, comorbidities, and cardiac remodeling were evaluated. Cardiac function was assessed by papillary muscle evaluation at baseline and after inotropic maneuvers. RESULTS The high-fat diets promoted increase in body fat and adiposity index in OP rats compared with C and OR rats. Glucose, lipid, and blood pressure profiles remained unchanged in OR rats. In addition, the total heart weight and the weight of the left and right ventricles in OR rats were lower than those in OP rats, but similar to those in C rats. Baseline cardiac muscle data were similar in all rats, but myocardial responsiveness to a post-rest contraction stimulus was compromised in OP and OR rats compared with C rats. CONCLUSION Obesity resistance promoted specific changes in the contraction phase without changes in the relaxation phase. This mild abnormality may be related to intracellular Ca2+ handling.
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Affiliation(s)
| | - Ana Paula Lima-Leopoldo
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Bruno Barcellos Jacobsen
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Artur Junio Togneri Ferron
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Wagner Muller Estevam
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Dijon Henrique Salomé Campos
- Departamento de Clínica Médica, Faculdade de Medicina, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | - Edson Castardeli
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Márcia Regina Holanda da Cunha
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Antonio Carlos Cicogna
- Departamento de Clínica Médica, Faculdade de Medicina, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | - André Soares Leopoldo
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
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Ferron AJT, Jacobsen BB, Sant’Ana PG, de Campos DHS, de Tomasi LC, Luvizotto RDAM, Cicogna AC, Leopoldo AS, Lima-Leopoldo AP. Cardiac Dysfunction Induced by Obesity Is Not Related to β-Adrenergic System Impairment at the Receptor-Signalling Pathway. PLoS One 2015; 10:e0138605. [PMID: 26390297 PMCID: PMC4577087 DOI: 10.1371/journal.pone.0138605] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 09/01/2015] [Indexed: 01/29/2023] Open
Abstract
Obesity has been shown to impair myocardial performance. Some factors have been suggested as responsible for possible cardiac abnormalities in models of obesity, among them beta-adrenergic (βA) system, an important mechanism of regulation of myocardial contraction and relaxation. The objective of present study was to evaluate the involvement of βA system components in myocardial dysfunction induced by obesity. Thirty-day-old male Wistar rats were distributed in control (C, n = 25) and obese (Ob, n = 25) groups. The C group was fed a standard diet and Ob group was fed four unsaturated high-fat diets for 15 weeks. Cardiac function was evaluated by isolated papillary muscle preparation and βA system evaluated by using cumulative concentrations of isoproterenol and Western blot. After 15 weeks, the Ob rats developed higher adiposity index than C rats and several comorbidities; however, were not associated with changes in systolic blood pressure. Obesity caused structural changes and the myocardial responsiveness to post-rest contraction stimulus and increased extracellular calcium (Ca2+) was compromised. There were no changes in cardiac function between groups after βA stimulation. The obesity was not accompanied by changes in protein expression of G protein subunit alpha (Gsα) and βA receptors (β1AR and β2AR). In conclusion, the myocardial dysfunction caused by unsaturated high-fat diet-induced obesity, after 15 weeks, is not related to βAR system impairment at the receptor-signalling pathway.
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Affiliation(s)
- Artur Junio Togneri Ferron
- Center of Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Bruno Barcellos Jacobsen
- Center of Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Paula Grippa Sant’Ana
- Department of Clinical and Cardiology, School of Medicine, UNESP- Univ. Estadual Paulista, Botucatu, São Paulo, Brazil
| | | | - Loreta Casquel de Tomasi
- Department of Clinical and Cardiology, School of Medicine, UNESP- Univ. Estadual Paulista, Botucatu, São Paulo, Brazil
| | | | - Antonio Carlos Cicogna
- Department of Clinical and Cardiology, School of Medicine, UNESP- Univ. Estadual Paulista, Botucatu, São Paulo, Brazil
| | - André Soares Leopoldo
- Center of Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Ana Paula Lima-Leopoldo
- Center of Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
- * E-mail:
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LEOPOLDO ANDRES, da Silva VL, Togneri AJ, Cordeiro JP, de Deus AF, Campos DH, Padovani CR, Sugizaki MM, Cicogna AC, Lima-Leopoldo AP. Effect Of Exercise Training On Myocardial L-type Calcium Channel Of Obese Rats. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000477149.02899.cb] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lima-Leopoldo AP, da Silva VL, Cordeiro JP, Campos DH, Estevam WM, Ferreira LG, Cicogna AC, LEOPOLDO ANDRES. Effect Of Exercise Training On Blood Pressure And Cardiac Morphology In Obese Rats. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000477568.94733.7b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lima-Leopoldo AP, Ferron A, Jacobsen B, Campos D, Luvizotto R, Cunha MR, Cicogna A, Leopoldo A. Abstract 156: Involvement of β-adrenergic System in Myocardial Dysfunction Induced by Obesity. Circ Res 2014. [DOI: 10.1161/res.115.suppl_1.156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Several structural and functional changes of the heart have often been associated with human and experimental models of obesity. Some factors have been suggested as responsible for possible cardiac abnormalities in models of obesity, among them β-adrenergic system, an important mechanism of regulation of myocardial contraction and relaxation. The objetive of present study was to evaluate the . Thirty-day-old male Wistar rats were assigned to one of two groups: control (C) and obese (Ob). The C group was fed a standard diet and Ob group was fed cycles of four unsaturated high-fat diets for 15 weeks. The body fat was measured from the sum of the individual fat pad weights and the obesity was defined by adiposity index. Isolated papillary muscle preparation was performed under basal conditions and after inotropic and lusitropic maneuvers. β-adrenergic system was evaluated by using cumulative concentrations of isoproterenol and Western Blot. After 15 weeks, the Ob rats developed higher adiposity index than C rats. Obesity promoted comorbities such as glucose intolerance, insulin resistance, hyperleptinemia, and dyslipidemia; however, were not associated with changes in systolic blood pressure. The cardiac structure results post-death showed that obesity caused cardiac hypertrophy. Furthermore, Ob muscles developed similar baseline data, but myocardial responsiveness to post-rest contraction stimulus and increased extracellular Ca2+ was compromised. There were no changes in cardiac function between groups after β-adrenergic stimulation. The obesity was not accompanied by changes in protein expression of Gsα, β1 and β2 adrenergic receptors. In conclusion, the myorcardial dysfunction caused by unsaturated high-fat diet-induced obesity, after 15 weeks, is not related to β-adrenergic system impairment.
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Affiliation(s)
| | | | | | - Dijon Campos
- UNESP- Univ. Estadual Paulista, Botucatu, Brazil
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Lima-Leopoldo AP, Leopoldo AS, da Silva DCT, do Nascimento AF, de Campos DHS, Luvizotto RAM, de Deus AF, Freire PP, Medeiros A, Okoshi K, Cicogna AC. Long-term obesity promotes alterations in diastolic function induced by reduction of phospholamban phosphorylation at serine-16 without affecting calcium handling. J Appl Physiol (1985) 2014; 117:669-78. [PMID: 24970855 DOI: 10.1152/japplphysiol.00088.2014] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [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: 01/08/2023] Open
Abstract
Few studies have evaluated the relationship between the duration of obesity, cardiac function, and the proteins involved in myocardial calcium (Ca(2+)) handling. We hypothesized that long-term obesity promotes cardiac dysfunction due to a reduction of expression and/or phosphorylation of myocardial Ca(2+)-handling proteins. Thirty-day-old male Wistar rats were distributed into two groups (n = 10 each): control (C; standard diet) and obese (Ob; high-fat diet) for 30 wk. Morphological and histological analyses were assessed. Left ventricular cardiac function was assessed in vivo by echocardiographic evaluation and in vitro by papillary muscle. Cardiac protein expression of sarcoplasmic reticulum (SR) Ca(2+)-ATPase (SERCA2a), calsequestrin, L-type Ca(2+) channel, and phospholamban (PLB), as well as PLB serine-16 phosphorylation (pPLB Ser(16)) and PLB threonine-17 phosphorylation (pPLB Thr(17)) were determined by Western blot. The adiposity index was higher (82%) in Ob rats than in C rats. Obesity promoted cardiac hypertrophy without alterations in interstitial collagen levels. Ob rats had increased endocardial and midwall fractional shortening, posterior wall shortening velocity, and A-wave compared with C rats. Cardiac index, early-to-late diastolic mitral inflow ratio, and isovolumetric relaxation time were lower in Ob than in C. The Ob muscles developed similar baseline data and myocardial responsiveness to increased extracellular Ca(2+). Obesity caused a reduction in cardiac pPLB Ser(16) and the pPLB Ser(16)/PLB ratio in Ob rats. Long-term obesity promotes alterations in diastolic function, most likely due to the reduction of pPLB Ser(16), but does not impair the myocardial Ca(2+) entry and recapture to SR.
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Affiliation(s)
- Ana Paula Lima-Leopoldo
- Center for Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória;
| | - André S Leopoldo
- Center for Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Vitória
| | - Danielle C T da Silva
- Department of Clinic and Cardiology, School of Medicine, Universidade Estadual Paulista, Botucatu, São Paulo; and
| | - André F do Nascimento
- Department of Clinic and Cardiology, School of Medicine, Universidade Estadual Paulista, Botucatu, São Paulo; and
| | - Dijon H S de Campos
- Department of Clinic and Cardiology, School of Medicine, Universidade Estadual Paulista, Botucatu, São Paulo; and
| | - Renata A M Luvizotto
- Department of Clinic and Cardiology, School of Medicine, Universidade Estadual Paulista, Botucatu, São Paulo; and
| | - Adriana F de Deus
- Department of Clinic and Cardiology, School of Medicine, Universidade Estadual Paulista, Botucatu, São Paulo; and
| | - Paula P Freire
- Department of Clinic and Cardiology, School of Medicine, Universidade Estadual Paulista, Botucatu, São Paulo; and
| | | | - Katashi Okoshi
- Department of Clinic and Cardiology, School of Medicine, Universidade Estadual Paulista, Botucatu, São Paulo; and
| | - Antonio C Cicogna
- Department of Clinic and Cardiology, School of Medicine, Universidade Estadual Paulista, Botucatu, São Paulo; and
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de Campos DHS, Leopoldo AS, Lima-Leopoldo AP, do Nascimento AF, de Oliveira-Junior SA, da Silva DCT, Sugizaki MM, Padovani CR, Cicogna AC. Obesity Preserves Myocardial Function During Blockade of the Glycolytic Pathway. Arq Bras Cardiol 2014. [PMID: 25352507 PMCID: PMC4206364 DOI: 10.5935/abc.20140135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background Obesity is defined by excessive accumulation of body fat relative to lean tissue.
Studies during the last few years indicate that cardiac function in obese animals
may be preserved, increased or diminished. Objective Study the energy balance of the myocardium with the hypothesis that the increase
in fatty acid oxidation and reduced glucose leads to cardiac dysfunction in
obesity. Methods 30-day-old male Wistar rats were fed standard and hypercaloric diet for 30 weeks.
Cardiac function and morphology were assessed. In this paper was viewed the
general characteristics and comorbities associated to obesity. The structure
cardiac was determined by weights of the heart and left ventricle (LV). Myocardial
function was evaluated by studying isolated papillary muscles from the LV, under
the baseline condition and after inotropic and lusitropic maneuvers: myocardial
stiffness; postrest contraction; increase in extracellular Ca2+ concentration;
change in heart rate and inhibitor of glycolytic pathway. Results Compared with control group, the obese rats had increased body fat and
co-morbities associated with obesity. Functional assessment after blocking
iodoacetate shows no difference in the linear regression of DT, however, the RT
showed a statistically significant difference in behavior between the control and
the obese group, most notable being the slope in group C. Conclusion The energy imbalance on obesity did not cause cardiac dysfunction. On the
contrary, the prioritization of fatty acids utilization provides protection to
cardiac muscle during the inhibition of glycolysis, suggesting that this pathway
is fewer used by obese cardiac muscle.
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Affiliation(s)
- Dijon Henrique Salomé de Campos
- Departamento de Clínica Médica - Faculdade de Medicina de
Botucatu da Universidade Estadual Paulista (UNESP), Botucatu, SP - Brazil
- Mailing Address: Antonio Carlos Cicogna/ Dijon HS Campos.
Department of Clinical and Cardiology, School of Medicine, University Estadual
Paulista (UNESP); Rubião Júnior, S/N, Postal Code 18618-000, Botucatu,
São Paulo - Brazil.
| | - André Soares Leopoldo
- Departamento de Esportes - Centro de Educação
Física e Desportos da Universidade Federal do Espírito Santo (UFES),
Vitória, ES - Brazil
| | - Ana Paula Lima-Leopoldo
- Departamento de Esportes - Centro de Educação
Física e Desportos da Universidade Federal do Espírito Santo (UFES),
Vitória, ES - Brazil
| | | | | | - Danielle Cristina Tomaz da Silva
- Departamento de Clínica Médica - Faculdade de Medicina de
Botucatu da Universidade Estadual Paulista (UNESP), Botucatu, SP - Brazil
| | - Mario Mateus Sugizaki
- Instituto de Ciências da Saúde da Universidade Federal do
Mato Grosso (UFMT), Sinop, MT - Brazil
| | - Carlos Roberto Padovani
- Departamento de Bioestatística, Instituto de Ciências
Biológicas da Universidade Estadual Paulista (UNESP), Botucatu, SP - Brazil
| | - Antonio Carlos Cicogna
- Departamento de Clínica Médica - Faculdade de Medicina de
Botucatu da Universidade Estadual Paulista (UNESP), Botucatu, SP - Brazil
- Mailing Address: Antonio Carlos Cicogna/ Dijon HS Campos.
Department of Clinical and Cardiology, School of Medicine, University Estadual
Paulista (UNESP); Rubião Júnior, S/N, Postal Code 18618-000, Botucatu,
São Paulo - Brazil.
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Lima-Leopoldo AP, Leopoldo AS, Silva DCT, Nascimento AFD, Campos DHSD, Luvizotto RDAM, Oliveira Júnior SAD, Padovani CR, Nogueira CR, Cicogna AC. Influence of long-term obesity on myocardial gene expression. Arq Bras Cardiol 2013; 100:229-37. [PMID: 23598576 DOI: 10.5935/abc.20130045] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 10/26/2012] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Several authors have shown that deterioration of cardiac function is associated with the degree and duration of obesity. It is necessary to establish the gene expression patterns after prolonged periods of obesity. OBJECTIVE This study tested the hypothesis that increased duration of exposure to obesity leads to a reduction in the mRNA levels of proteins involved in regulation of myocardial Ca2+ homeostasis. In addition, this study verified whether the decrease in mRNA expression was caused by a reduction in thyroid hormone. METHODS Thirty-day-old male Wistar rats were distributed in two groups: control (C) and obese (Ob). The C group was fed a standard diet and the Ob was fed with high-fat diets for 15, 30 and 45 weeks. Obesity was defined by adiposity index. The gene expression was assessed by quantitative real-time PCR. RESULTS The adiposity index was higher in the Ob compared to the C after all periods. While obesity at 15 and 45 weeks resulted in a reduction in mRNA of sarcoplasmic reticulum Ca2+- ATPase (SERCA2a), Na+/Ca2+ exchanger (NCX), and calsequestrin (CSQ), L-type Ca2+ channels, ryanodine receptor, SERCA2a, phospholamban (PLB), NCX, and CSQ expression were increased compared to the C after 30 weeks. There was no significant association between T3 levels and mRNA expression. CONCLUSIONS Our data indicate that obesity over the short and long periods of time may promote alteration in gene expression of Ca2+ homeostasis regulatory proteins without influence by thyroid hormone.
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Silva DCTD, Lima-Leopoldo AP, Leopoldo AS, Campos DHSD, Nascimento AFD, Oliveira Junior SAD, Padovani CR, Cicogna AC. Influence of term of exposure to high-fat diet-induced obesity on myocardial collagen type I and III. Arq Bras Cardiol 2013; 102:157-63. [PMID: 24676371 PMCID: PMC3987330 DOI: 10.5935/abc.20130232] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Accepted: 08/22/2013] [Indexed: 01/15/2023] Open
Abstract
Background Obesity is a risk factor for many medical complications; medical research has
shown that hemodynamic, morphological and functional abnormalities are correlated
with the duration and severity of obesity. Objective Present study determined the influence of term of exposure to high-fat
diet-induced obesity on myocardial collagen type I and III. Methods Thirty-day-old male Wistar rats were randomly distributed into two groups: a
control (C) group fed a standard rat chow and an obese (Ob) group alternately fed
one of four palatable high-fat diets. Each diet was changed daily, and the rats
were maintained on their respective diets for 15 (C15 and
Ob15) and 30 (C30 and Ob30) consecutive weeks.
Obesity was determined by adiposity index. Results The Ob15 group was similar to the C15 group regarding the
expression of myocardial collagen type I; however, expression in the
Ob30 group was less than C30 group. The time of exposure
to obesity was associated with a reduction in collagen type I in Ob30
when compared with Ob15. Obesity did not affect collagen type III
expression. Conclusion This study showed that the time of exposure to obesity for 30 weeks induced by
unsaturated high-fat diet caused a reduction in myocardial collagen type I
expression in the obese rats. However, no effect was seen on myocardial collagen
type III expression.
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Affiliation(s)
| | - Ana Paula Lima-Leopoldo
- Departamento de Esportes, Centro de Educacao Fisica e Desportos, Universidade Federal do Espirito Santo, Vitoria, ES, Brasil
| | - André Soares Leopoldo
- Departamento de Esportes, Centro de Educacao Fisica e Desportos, Universidade Federal do Espirito Santo, Vitoria, ES, Brasil
| | | | - André Ferreira do Nascimento
- Departamento de Clinica Medica, Faculdade de Medicina de Botucatu, Universidade Estadual Paulista, Botucatu, SP, Brasil
| | | | - Carlos Roberto Padovani
- Departamento de Bioestatistica, Instituto de Ciencias Biologicas, Universidade Estadual Paulista, Botucatu, SP, Brasil
| | - Antonio Carlos Cicogna
- Departamento de Clinica Medica, Faculdade de Medicina de Botucatu, Universidade Estadual Paulista, Botucatu, SP, Brasil
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Mendes OC, Sugizaki MM, Campos DS, Damatto RL, Leopoldo AS, Lima-Leopoldo AP, Baldissera V, Padovani CR, Okoshi K, Cicogna AC. Exercise tolerance in rats with aortic stenosis and ventricular diastolic and/or systolic dysfunction. Arq Bras Cardiol 2012. [PMID: 23197170 DOI: 10.1590/s0066-782x2012005000112] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Physical stress tolerance (ST) is a measurement of cardiorespiratory fitness. Aerobic capacity is reduced in heart failure (HF) although there is no data available on this parameter in animals with ventricular dysfunction and no signs of HF. OBJECTIVE Evaluate ST in rats with ventricular diastolic dysfunction isolated or associated with systolic dysfunction induced by ascending aortic stenosis (AoS). METHODS Young male Wistar rats (20-30 days old), divided in: control group (CG, n=11) and AoSG group, (n=12). Animals were assessed at 6 and 18 weeks after AoS surgery. Treadmill exercise test was until exhaustion and evaluated treadmill speed and lactate concentration [LAC] at lactate threshold, treadmill speed and [LAC] at exhaustion, and total testing time. RESULTS Echocardiography data revealed remodeling of the left atrium and left ventricular concentric hypertrophy at 6 and 18 weeks. Endocardial fractional shortening was greater in AoSG than CG at 6 and 18 weeks. Midwall fractional shortening was greater in AoSG than in CG only 6 week. Cardiac index was similar in CG and AoSG at 6 and 18 weeks and decreased between from 6 to 18 weeks in both groups. The E wave to A wave ratio was greater in CG than in AoSG at both periods and did not change in both groups between week 6 and 18. Treadmill stress testing parameters were similar in both groups at 6 or 18 weeks. CONCLUSION Although AoS promotes isolated diastolic dysfunction or associated with systolic dysfunction at 6 or 18 weeks, it is not sufficient to modify physical stress tolerance.
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Affiliation(s)
- Olga Castro Mendes
- Departamento de Clínica Médica, Faculdade de Medicina, Universidade Estadual Paulista, Botucatu, SP, Brasil
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Bruder-Nascimento T, Campos DHS, Leopoldo AS, Lima-Leopoldo AP, Okoshi K, Cordellini S, Cicogna AC. Chronic stress improves the myocardial function without altering L-type Ca+2 channel activity in rats. Arq Bras Cardiol 2012; 99:907-14. [PMID: 22936032 DOI: 10.1590/s0066-782x2012005000082] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Accepted: 04/16/2012] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Chronic stress is associated with cardiac remodeling; however the mechanisms have yet to be clarified. OBJECTIVE The purpose of this study was test the hypothesis that chronic stress promotes cardiac dysfunction associated to L-type calcium Ca2+ channel activity depression. METHODS Thirty-day-old male Wistar rats (70 - 100 g) were distributed into two groups: control (C) and chronic stress (St). The stress was consistently maintained at immobilization during 15 weeks, 5 times per week, 1h per day. The cardiac function was evaluated by left ventricular performance through echocardiography and by ventricular isolated papillary muscle. The myocardial papillary muscle activity was assessed at baseline conditions and with inotropic maneuvers such as: post-rest contraction and increases in extracellular Ca2+ concentration, in presence or absence of specific blockers L-type calcium channels. RESULTS The stress was characterized for adrenal glands hypertrophy, increase of systemic corticosterone level and arterial hypertension. The chronic stress provided left ventricular hypertrophy. The left ventricular and baseline myocardial function did not change with chronic stress. However, it improved the response of the papillary muscle in relation to positive inotropic stimulation. This function improvement was not associated with the L-type Ca2+ channel. CONCLUSION Chronic stress produced cardiac hypertrophy; however, in the study of papillary muscle, the positive inotropic maneuvers potentiated cardiac function in stressed rats, without involvement of L-type Ca2+ channel. Thus, the responsible mechanisms remain unclear with respect to Ca2+ influx alterations.
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Affiliation(s)
- Thiago Bruder-Nascimento
- Department de Pharmacology, Institute of Bioscience, São Paulo State University (UNESP), Brazil.
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Luvizotto RDAM, do Nascimento AF, de Síbio MT, Olímpio RMC, Conde SJ, Lima-Leopoldo AP, Leopoldo AS, Cicogna AC, Nogueira CR. Experimental hyperthyroidism decreases gene expression and serum levels of adipokines in obesity. ScientificWorldJournal 2012; 2012:780890. [PMID: 22645452 PMCID: PMC3356725 DOI: 10.1100/2012/780890] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2011] [Accepted: 12/27/2011] [Indexed: 01/20/2023] Open
Abstract
Aims. To analyze the influence of hyperthyroidism on the gene expression and serum concentration of leptin, resistin, and adiponectin in obese animals.
Main Methods. Male Wistar rats were randomly divided into two groups: control (C)—fed with commercial chow ad libitum—and obese (OB)—fed with a hypercaloric diet. After group characterization, the OB rats continued receiving a hypercaloric diet and were randomized into two groups: obese animals (OB) and obese with 25 μg triiodothyronine (T3)/100 BW (OT). The T3 dose was administered every day for the last 2 weeks of the study. After 30 weeks the animals were euthanized. Samples of blood and adipose tissue were collected for biochemical and hormonal analyses as well as gene expression of leptin, resistin, and adiponectin. Results. T3 treatment was effective, increasing fT3 levels and decreasing fT4 and TSH serum concentration. Administration of T3 promotes weight loss, decreases all fat deposits, and diminishes serum levels of leptin, resistin, and adiponectin by reducing their gene expression. Conclusions. Our results suggest that T3 modulate serum and gene expression levels of leptin, resistin, and adiponectin in experimental model of obesity, providing new insights regarding the relationship between T3 and adipokines in obesity.
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Leopoldo AS, Lima-Leopoldo AP, Sugizaki MM, do Nascimento AF, de Campos DHS, Luvizotto RDAM, Castardeli E, Alves CAB, Brum PC, Cicogna AC. Involvement of L-type calcium channel and SERCA2a in myocardial dysfunction induced by obesity. J Cell Physiol 2011; 226:2934-42. [PMID: 21302294 DOI: 10.1002/jcp.22643] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Obesity has been shown to impair myocardial performance. Nevertheless, the mechanisms underlying the participation of calcium (Ca(2+) ) handling on cardiac dysfunction in obesity models remain unknown. L-type Ca(2+) channels and sarcoplasmic reticulum (SR) Ca(2+) -ATPase (SERCA2a), may contribute to the cardiac dysfunction induced by obesity. The purpose of this study was to investigate whether myocardial dysfunction in obese rats is related to decreased activity and/or expression of L-type Ca(2+) channels and SERCA2a. Male 30-day-old Wistar rats were fed standard (C) and alternately four palatable high-fat diets (Ob) for 15 weeks. Obesity was determined by adiposity index and comorbidities were evaluated. Myocardial function was evaluated in isolated left ventricle papillary muscles under basal conditions and after inotropic and lusitropic maneuvers. L-type Ca(2+) channels and SERCA2a activity were determined using specific blockers, while changes in the amount of channels were evaluated by Western blot analysis. Phospholamban (PLB) protein expression and the SERCA2a/PLB ratio were also determined. Compared with C rats, the Ob rats had increased body fat, adiposity index and several comorbidities. The Ob muscles developed similar baseline data, but myocardial responsiveness to post-rest contraction stimulus and increased extracellular Ca(2+) was compromised. The diltiazem promoted higher inhibition on developed tension in obese rats. In addition, there were no changes in the L-type Ca(2+) channel protein content and SERCA2a behavior (activity and expression). In conclusion, the myocardial dysfunction caused by obesity is related to L-type Ca(2+) channel activity impairment without significant changes in SERCA2a expression and function as well as L-type Ca(2+) protein levels.
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Affiliation(s)
- André Soares Leopoldo
- Department of Clinical and Cardiology, School of Medicine, UNESP- State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil.
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Lima-Leopoldo AP, Leopoldo AS, Sugizaki MM, Bruno A, Nascimento AF, Luvizotto RAM, Oliveira Júnior SAD, Castardeli E, Padovani CR, Cicogna AC. Disfunção miocárdica e alterações no trânsito de cálcio intracelular em ratos obesos. Arq Bras Cardiol 2011; 97:232-40. [DOI: 10.1590/s0066-782x2011005000061] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Accepted: 01/03/2011] [Indexed: 11/22/2022] Open
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Luvizotto RAM, Síbio MT, Olímpio RMC, Nascimento AF, Lima-Leopoldo AP, Leopoldo AS, Padovani CR, Cicogna AC, Nogueira CR. Supraphysiological triiodothyronine doses diminish leptin and adiponectin gene expression, but do not alter resistin expression in calorie restricted obese rats. Horm Metab Res 2011; 43:452-7. [PMID: 21557150 DOI: 10.1055/s-0031-1277187] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Thyroid hormones regulate energy balance and act on adipokines. However, while it is unclear what the effects are of calorie restriction and high doses of triiodothyronine (T(3)) on adipokines in obesity, thyroid hormones are illicitly administered in isolation or in association with a hypocaloric diet as an obesity treatment. The present study determined the effect of T(3) on serum concentrations and gene expression of the adipokines leptin, resistin, and adiponectin in calorie-restricted obese rats. Male Wistar rats received a hypercaloric diet for 20 weeks followed by calorie restriction for 8 weeks. The animals were then randomly divided into 3 groups: calorie restriction (OR), OR with 5 μg of T(3)/100 g BW (RS1), and OR with 25 μg of T(3)/100 g BW (RS2) for 2 weeks. Blood and adipose tissue samples were collected for biochemical, hormonal, and gene expression analyses. Serum concentrations of leptin (OR: 3.7±0.6, RS1: 3.8±1, RS2 0.2±0.07 ng/dl) and resistin (OR: 2.5±0.6, RS1: 2.5±0.5, RS2 1.6±0.3 ng/dl) were diminished at the higher dose, while serum adiponectin (OR: 31±7, RS1: 24±5, RS2 26±7 ng/dl) levels were lower in the low dose group. Administration of T(3) reduced leptin gene expression (OR: 0.91±0.1, RS1: 0.95±0.1, RS2 0.22±0.1) only at the higher dose, resistin expression (OR: 1.06±0.2, RS1: 1.04±0.1, RS2 0.88±0.2) was not influenced by T(3) treatment, and adiponectin expression (OR: 1.55±0.5, RS1: 0.95±0.15, RS2 0.97±0.13) was diminished independent of the T(3) dose. These results indicate that T(3), directly or indirectly, inhibits the expression of leptin and adiponectin in calorie restricted obese animals.
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Affiliation(s)
- R A M Luvizotto
- Department of Clinical Medicine, Botucatu School of Medicine, UNESP - University of São Paulo State, Botucatu, São Paulo, Brazil.
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Medei E, Lima-Leopoldo AP, Pereira-Junior PP, Leopoldo AS, Campos DHS, Raimundo JM, Sudo RT, Zapata-Sudo G, Bruder-Nascimento T, Cordellini S, Nascimento JHM, Cicogna AC. Could a high-fat diet rich in unsaturated fatty acids impair the cardiovascular system? Can J Cardiol 2011; 26:542-8. [PMID: 21165364 DOI: 10.1016/s0828-282x(10)70469-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Dyslipidemia results from consumption of a diet rich in saturated fatty acids and is usually associated with cardiovascular disease. A diet rich in unsaturated fatty acids is usually associated with improved cardiovascular condition. OBJECTIVE To investigate whether a high-fat diet rich in unsaturated fatty acids (U-HFD) - in which fatty acid represents approximately 45% of the total calories - impairs the cardiovascular system. METHODS Male, 30-day-old Wistar rats were fed a standard (control) diet or a U-HFD containing 83% unsaturated fatty acid for 19 weeks. The in vivo electrocardiogram, the spectral analysis of heart rate variability, and the vascular reactivity responses to phenylephrine, acetylcholine, noradrenaline and prazosin in aortic ring preparations were analyzed to assess the cardiovascular parameters. RESULTS After 19 weeks, the U-HFD rats had increased total body fat, baseline glucose levels and feed efficiency compared with control rats. However, the final body weight, systolic blood pressure, area under the curve for glucose, calorie intake and heart weight⁄final body weight ratio were similar between the groups. In addition, both groups demonstrated no alteration in the electrocardiogram or cardiac sympathetic parameters. There was no difference in the responses to acetylcholine or the maximal contractile response of the thoracic aorta to phenylephrine between groups, but the concentration necessary to produce 50% of maximal response showed a decrease in the sensitivity to phenylephrine in U-HFD rats. The cumulative concentration- effect curve for noradrenaline in the presence of prazosin was shifted similarly in both groups. CONCLUSIONS The present work shows that U-HFD did not impair the cardiovascular parameters analyzed.
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Affiliation(s)
- Emiliano Medei
- Universidade Federal do Rio de Janeiro, Instituto de Biofísica Carlos Chagas Filho, Rio de Janeiro, Brazil
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Sugizaki MM, Lima-Leopoldo AP, Conde SJ, Campos DS, Leopoldo AS, Nascimento AF, Cicogna AC. Upregulation Of Mrna Myocardium Calcium Handling In Rats Submitted To Exercise And Food Restriction. Med Sci Sports Exerc 2011. [DOI: 10.1249/01.mss.0000401819.57892.30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Leopoldo AS, Sugizaki MM, Lima-Leopoldo AP, do Nascimento AF, Luvizotto RDAM, de Campos DHS, Okoshi K, Dal Pai-Silva M, Padovani CR, Cicogna AC. Cardiac remodeling in a rat model of diet-induced obesity. Can J Cardiol 2010; 26:423-9. [PMID: 20931095 DOI: 10.1016/s0828-282x(10)70440-2] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The mechanisms by which diet-induced obesity cause remodeling and cardiac dysfunction are still unknown. Interstitial collagen and myocardial ultrastructure are important in the development of left ventricular hypertrophy, and are essential to the adaptive and maladaptive changes associated with obesity. Thus, the accumulation of collagen and ultrastructural damage may contribute to cardiac dysfunction in obesity. The purpose of the present study was to investigate cardiac function in a rat model of diet-induced obesity and to test the hypothesis that cardiac dysfunction induced by obesity is related to myocardial collagen deposition and ultrastructural damage. Thirty-day-old male Wistar rats were fed standard (control [C]) and hypercaloric diets (obese [Ob]) for 15 weeks. Cardiac function was evaluated by echocardiogram and isolated left ventricle papillary muscle. Cardiac morphology was assessed by histology and electron microscopy. Compared with C rats, Ob rats had increased body fat, systolic blood pressure and area under the curve for glucose, leptin and insulin plasma concentrations. Echocardiographic indexes indicated that Ob rats had increased left ventricular mass, increased systolic stress and depressed systolic function. Analysis of the isolated papillary muscle was consistent with higher myocardial stiffness in Ob compared with C rats. The Ob rats had an increase in myocardial collagen and marked ultrastructural changes compared with C rats. Obesity promotes pathological cardiac remodeling with systolic dysfunction and an increase in myocardial stiffness, which, in turn, is probably related to afterload elevation and cardiac fibrosis. Obesity also causes damage to myocardial ultrastructure, but its effect on myocardial function needs to be further clarified.
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Affiliation(s)
- André Soares Leopoldo
- Department of Clinical and Cardiology, Universidade Estadual Paulista "Julio de Mesquita Filho", Botucatu, São Paulo, Brazil.
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Oliveira SA, Okoshi K, Lima-Leopoldo AP, Leopoldo AS, Campos DHS, Martinez PF, Okoshi MP, Padovani CR, Pai-Silva MD, Cicogna AC. Nutritional and cardiovascular profiles of normotensive and hypertensive rats kept on a high fat diet. Arq Bras Cardiol 2010; 93:526-33. [PMID: 20084315 DOI: 10.1590/s0066-782x2009001100014] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2008] [Accepted: 10/21/2008] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Although a high fat diet (HFD) promotes nutritional and heart disorders, few studies have assessed its influence in normotensive Wistar-Kyoto rats (WKY) and spontaneously hypertensive rats (SHR). OBJECTIVE To evaluate and compare the nutritional and cardiovascular profiles of WKY and SHR on a high fat diet. METHODS 20 WKY and 20 SHR were divided into four groups: Control-WKY (C-WKY), HFD-WKY, Control-SHR (C-SHR) and HFD-SHR. The C and HFD groups received, respectively, a normocaloric diet and a HFD for 20 weeks. The following features were evaluated: body weight (BW), adiposity, blood glucose, serum lipids, with measurements of total cholesterol and triacylglycerol levels, insulin and leptin. The cardiovascular study included the systolic blood pressure (SBP), a cardiopulmonary anatomical evaluation, an echocardiography and heart histology. RESULTS The SHR had BW, adiposity, glucose, cholesterol, triacylglycerol, leptin and insulin levels lower than the WKY. In SHR, the caloric intake increased with HFD. In WKY, the HFD increased energy efficiency, adiposity and blood leptin, and reduced glucose. In the cardiovascular assessment, the SHR had SBP, pulmonary moisture, myocardial hypertrophy and interstitial fibrosis higher than the WKY (p <0.01); the cardiac function was similar in both strains. The HFD reduced the ventricular systolic diameter in the WKY and increased the mitral E/A ratio, the diastolic thickness of the interventricular septum and the posterior wall, as well as the interstitial fibrosis of the left ventricle. (Arq Bras Cardiol 2009; 93(5) : 487-494) CONCLUSION Although it had not significantly affected the nutritional profile of the SHR, the treatment increased cardiac remodeling and precipitated the emergence of ventricular diastolic dysfunction. In WKY, the diet increased adiposity and leptinemia, and promoted non-significant cardiovascular changes.
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Pinotti MF, Leopoldo AS, Silva MDP, Sugizaki MM, do Nascimento AF, Lima-Leopoldo AP, Aragon FF, Padovani CR, Cicogna AC. A comparative study of myocardial function and morphology during fasting/refeeding and food restriction in rats. Cardiovasc Pathol 2009; 19:e175-82. [PMID: 19914094 DOI: 10.1016/j.carpath.2009.08.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2009] [Revised: 08/10/2009] [Accepted: 08/14/2009] [Indexed: 10/20/2022] Open
Abstract
BACKGROUND This study compared the influence of fasting/refeeding cycles and food restriction on rat myocardial performance and morphology. METHODS Sixty-day-old male Wistar rats were submitted to food ad libitum (C), 50% food restriction (R50), and fasting/refeeding cycles (RF) for 12 weeks. Myocardial function was evaluated under baseline conditions and after progressive increase in calcium and isoproterenol. Myocardium ultrastructure was examined in the papillary muscle. RESULTS Fasting/refeeding cycles maintained rat body weight and left ventricle weight between control and food-restricted rats. Under baseline conditions, the time to peak tension (TPT) was more prolonged in R50 than in RF and C rats. Furthermore, the maximum tension decline rate (-dT/dt) increased less in R50 than in RF with calcium elevation. While the R50 group showed focal changes in many muscle fibers, such as the disorganization or loss of myofilaments, polymorphic mitochondria with disrupted cristae, and irregular appearance or infolding of the plasma membrane, the RF rats displayed few alterations such as loss or disorganization of myofibrils. CONCLUSION Food restriction promotes myocardial dysfunction, not observed in RF rats, and higher morphological damage than with fasting/refeeding. The increase in TPT may be attributed possibly to the disorganization and loss of myofibrils; however, the mechanisms responsible for the alteration in -dT/dt in R50 needs to be further clarified.
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Affiliation(s)
- Matheus Fécchio Pinotti
- Department of Internal Medicine, School of Medicine, State University "Júlio de Mesquita Filho", UNESP, Botucatu, São Paulo, Brazil
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Sugizaki MM, Leopoldo AS, Okoshi MP, Bruno A, Conde SJ, Lima-Leopoldo AP, Padovani CR, Carvalho RF, Nascimento AFD, Campos DHSD, Nogueira CR, Cicogna AC. Severe food restriction induces myocardial dysfunction related to SERCA2 activity. Can J Physiol Pharmacol 2009; 87:666-73. [DOI: 10.1139/y09-060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Previous studies have shown that food restriction promotes myocardial dysfunction in rats. However, the molecular mechanisms that are responsible are unclear. We investigated the role of sarcoplasmic reticulum Ca2+-ATPase (SERCA2) on myocardial performance in food-restricted rats. Male Wistar–Kyoto rats, 60 days old, were fed a control or restricted diet (daily energy intake reduced to 50% of the control) for 90 days. Expression of Serca2a, phospholamban (PLB), Na+/Ca2+ exchanger (NCX), and thyroid hormone receptor (TRα1, TRβ1) mRNA was determined by quantitative PCR. SERCA2 activity was measured by using 20 µmol/L cyclopiazonic acid (CPA) in a left ventricular papillary muscle preparation during isometric contraction in basal conditions and during post-rest contraction. Serum concentrations of thyroxine (T4) and thyrotropin (TSH) were also determined. The 50%-restricted diet reduced body and ventricular weight and serum T4 and TSH levels. The interaction of CPA and food restriction reduced peak developed tension and maximum rate of tension decline (–dT/dt), but increased the resting tension intensity response during post-rest contraction. PLB and NCX mRNA were upregulated and TRα1 mRNA was downregulated by food restriction. These results suggest that food restriction promotes myocardial dysfunction related to impairment of sarcoplasmic reticulum Ca2+ uptake as a result of a hypothyroid state.
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Affiliation(s)
- Mário Mateus Sugizaki
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - André Soares Leopoldo
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Marina Politi Okoshi
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Alessandro Bruno
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Sandro José Conde
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Ana Paula Lima-Leopoldo
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Carlos Roberto Padovani
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Robson Francisco Carvalho
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - André Ferreira do Nascimento
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Dijon Henrique Salomé de Campos
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Célia Regina Nogueira
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Antonio Carlos Cicogna
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
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De Tomasi LC, Bruno A, Sugizaki MM, Lima-Leopoldo AP, Nascimento AF, Júnior SADO, Pinotti MF, Padovani CR, Leopoldo AS, Cicogna AC. Food restriction promotes downregulation of myocardial L-type Ca2+ channels. Can J Physiol Pharmacol 2009; 87:426-31. [DOI: 10.1139/y09-025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Food restriction (FR) has been shown to impair myocardial performance. However, the mechanisms behind these changes in myocardial function due to FR remain unknown. Since myocardial L-type Ca2+ channels may contribute to the cardiac dysfunction, we examined the influence of FR on L-type Ca2+ channels. Male 60-day-old Wistar rats were fed a control or a restricted diet (daily intake reduced to 50% of the amount of food consumed by the control group) for 90 days. Myocardial performance was evaluated in isolated left ventricular papillary muscles. The function of myocardial L-type Ca2+ channels was determined by using a pharmacological Ca2+ channel blocker, and changes in the number of channels were evaluated by mRNA and protein expression. FR decreased final body weights, as well as weights of the left and right ventricles. The Ca2+ channel blocker diltiazem promoted a higher blockade on developed tension in FR groups than in controls. The protein content of L-type Ca2+ channels was significantly diminished in FR rats, whereas the mRNA expression was similar between groups. These results suggest that the myocardial dysfunction observed in previous studies with FR animals could be caused by downregulation of L-type Ca2+ channels.
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Affiliation(s)
- Loreta Casquel De Tomasi
- Department of Clinical Cardiology, School of Medicine, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
| | - Alessandro Bruno
- Department of Clinical Cardiology, School of Medicine, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
| | - Mário Mateus Sugizaki
- Department of Clinical Cardiology, School of Medicine, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
| | - Ana Paula Lima-Leopoldo
- Department of Clinical Cardiology, School of Medicine, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
| | - André Ferreira Nascimento
- Department of Clinical Cardiology, School of Medicine, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
| | - Silvio Assis de Oliveira Júnior
- Department of Clinical Cardiology, School of Medicine, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
| | - Matheus Fécchio Pinotti
- Department of Clinical Cardiology, School of Medicine, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
| | - Carlos Roberto Padovani
- Department of Clinical Cardiology, School of Medicine, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
| | - André Soares Leopoldo
- Department of Clinical Cardiology, School of Medicine, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
| | - Antonio Carlos Cicogna
- Department of Clinical Cardiology, School of Medicine, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP – State University Júlio Mesquita Filho, Rubião Júnior, S/N, Cep. 18.618-000 Botucatu, São Paulo, Brazil
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