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Gregolin CS, do Nascimento M, de Souza SLB, Mota GAF, Luvizotto RDAM, Sugizaki MM, Bazan SGZ, de Campos DHS, Camacho CRC, Cicogna AC, do Nascimento AF. Cardiac dysfunction in sucrose-fed rats is associated with alterations of phospholamban phosphorylation and TNF-α levels. Mol Cell Endocrinol 2024; 589:112236. [PMID: 38608803 DOI: 10.1016/j.mce.2024.112236] [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: 01/18/2024] [Revised: 04/02/2024] [Accepted: 04/04/2024] [Indexed: 04/14/2024]
Abstract
INTRODUCTION High sucrose intake is linked to cardiovascular disease, a major global cause of mortality worldwide. Calcium mishandling and inflammation play crucial roles in cardiac disease pathophysiology. OBJECTIVE Evaluate if sucrose-induced obesity is related to deterioration of myocardial function due to alterations in the calcium-handling proteins in association with proinflammatory cytokines. METHODS Wistar rats were divided into control and sucrose groups. Over eight weeks, Sucrose group received 30% sucrose water. Cardiac function was determined in vivo using echocardiography and in vitro using papillary muscle assay. Western blotting was used to detect calcium handling protein; ELISA assay was used to assess TNF-α and IL-6 levels. RESULTS Sucrose led to cardiac dysfunction. RYR2, SERCA2, NCX, pPBL Ser16 and L-type calcium channels were unchanged. However, pPBL-Thr17, and TNF-α levels were elevated in the S group. CONCLUSION Sucrose induced cardiac dysfunction and decreased myocardial contractility in association with altered pPBL-Thr17 and elevated cardiac pro-inflammatory TNF-α.
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Affiliation(s)
- Cristina Schmitt Gregolin
- Department of Pathology, Medical School (FMB) of São Paulo State University (Unesp), Botucatu Campus, São Paulo, Brazil
| | - Milena do Nascimento
- Institute of Health Sciences, Federal University of Mato Grosso (UFMT), Sinop, Mato Grosso, Brazil
| | | | - Gustavo Augusto Ferreira Mota
- Department of Internal Medicine, Botucatu School of Medicine, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | | | - Mário Mateus Sugizaki
- Institute of Health Sciences, Federal University of Mato Grosso (UFMT), Sinop, Mato Grosso, Brazil
| | - Silméia Garcia Zanati Bazan
- Department of Internal Medicine, Botucatu School of Medicine, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Dijon Henrique Salomé de Campos
- Department of Internal Medicine, Botucatu School of Medicine, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Camila Renata Corrêa Camacho
- Department of Pathology, Medical School (FMB) of São Paulo State University (Unesp), Botucatu Campus, São Paulo, Brazil
| | - Antonio Carlos Cicogna
- Department of Internal Medicine, Botucatu School of Medicine, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
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Oliveira DBOD, Cunha GA, Giandoni MA, Carvalho PCDJ, Bonfim GF, Leopoldo APL, Leopoldo AS, Sugizaki MM. HIBISCUS INCREASES FUNCTIONAL CAPACITY AND THE ANTI-OBESITY EFFECT IN TRAINED OBESE RATS. REV BRAS MED ESPORTE 2023. [DOI: 10.1590/1517-8692202329012022_0119] [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: 11/22/2022] Open
Abstract
ABSTRACT Introduction Hibiscus sabdariffa (Hs) has been widely used for weight loss and in the fight against obesity-associated comorbidities. Objective To evaluate the effects of Hs and physical training on the functional capacity of normal-weight and obese rats. Methods Wistar rats were distributed into eight experimental groups: control (C, n = 8) , Hibiscus Sabdariffa (Hs, n = 8), high-intensity interval training (IT, n = 8), high-intensity interval training + Hibiscus Sabdariffa (ITHs, n = 8), obese (O, n = 8), obese + continuous aerobic training (OAT, n = 8), obese + Hibiscus Sabdariffa (OHs, n = 8), , and obese + continuous aerobic training + Hibiscus Sabdariffa (OATHs, n = 8). Hibiscus Sabdariffa extract was administered for 60 days in a dose of 150 mg/kg of body weight. The maximum progressive effort test (MPET) was performed on a treadmill at the beginning and end of the study. The variables analyzed were maximum speed Vmáx time, and distance covered. Lactate was measured immediately after the MPET. Functional capacity was evaluated by the distance/adiposity index. The ANOVA with Bonferroni post hoc and Pearson’s correlation tests were used at a 5% significance level. Results After both types of training, moderate-intensity continuous and high-intensity interval performed on the treadmill, final body weight, weight gain, and the adiposity index decreased, and Vmax, time, and distance covered in the MPET increased, in addition to an improvement in functional capacity. Hs supplementation reduced the adiposity index in normal-weight and obese rats. Hs associated with aerobic training reduced final body weight and increased functional capacity. Conclusion Hs supplementation promoted a reduction in the adiposity index in normal-weight and obese rats and an increase in the functional capacity of trained obese rats. Level of Evidence III; Therapeutic Studies - Outcome Investigation. Case study – control.
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de Souza SLB, Mota GAF, Gregolin CS, do Nascimento M, Luvizotto RAM, Bazan SGZ, Sugizaki MM, Barbisan LF, Cicogna AC, do Nascimento AF. Exercise Training Attenuates Cirrhotic Cardiomyopathy. J Cardiovasc Transl Res 2021; 14:674-684. [PMID: 32246321 DOI: 10.1007/s12265-020-09997-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 03/25/2020] [Indexed: 12/22/2022]
Abstract
Cirrhotic cardiomyopathy is a condition where liver cirrhosis is associated with cardiac dysfunction. Triggers and blockers of cirrhotic cardiomyopathy are poorly understood, which might compromise the prognosis of chronic liver disease patients. We tested whether exercise training would reduce liver damage induced by thioacetamide and prevent liver cirrhosis-associated cardiomyopathy. Wistar rats were divided into three groups: control, thioacetamide (TAA), or TAA plus exercise. Thioacetamide increased liver weight and serum alanine aminotransferase and aspartate aminotransferase levels. Also, TAA treatment was involved with hepatic nodule formation, fibrotic septa, inflammatory infiltration, and hepatocyte necrosis. The exercise group presented with a reduction in liver injury status. We found that liver injury was associated with disordered cardiac hypertrophy as well as diastolic and systolic dysfunction. Exercise training attenuated cirrhosis-associated cardiac remodeling and diastolic dysfunction and prevented systolic impairment. These results provided insights that exercise training can mitigate cirrhotic cardiomyopathy phenotype. Graphical Abstract Exercise training attenuated liver injury as well as cirrhosis-associated cardiac remodeling and diastolic dysfunction and prevented systolic impairment.
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Affiliation(s)
- Sérgio Luiz Borges de Souza
- Department of Internal Medicine, Botucatu School of Medicine, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Gustavo Augusto Ferreira Mota
- Department of Internal Medicine, Botucatu School of Medicine, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Cristina Schmitt Gregolin
- Institute of Health Sciences, Federal University of Mato Grosso (UFMT), Avenida Alexandre Ferronato, n°1200, Setor Industrial, Sinop, Mato Grosso, 78.556-267, Brazil
| | - Milena do Nascimento
- Institute of Health Sciences, Federal University of Mato Grosso (UFMT), Avenida Alexandre Ferronato, n°1200, Setor Industrial, Sinop, Mato Grosso, 78.556-267, Brazil
| | - Renata Azevedo Melo Luvizotto
- Institute of Health Sciences, Federal University of Mato Grosso (UFMT), Avenida Alexandre Ferronato, n°1200, Setor Industrial, Sinop, Mato Grosso, 78.556-267, Brazil
| | - Silmeia Garcia Zanati Bazan
- Department of Internal Medicine, Botucatu School of Medicine, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Mário Mateus Sugizaki
- Institute of Health Sciences, Federal University of Mato Grosso (UFMT), Avenida Alexandre Ferronato, n°1200, Setor Industrial, Sinop, Mato Grosso, 78.556-267, Brazil
| | - Luis Fernando Barbisan
- Department of Morphology, Institute of Biosciences, Sao Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Antonio Carlos Cicogna
- Department of Internal Medicine, Botucatu School of Medicine, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - André Ferreira do Nascimento
- Institute of Health Sciences, Federal University of Mato Grosso (UFMT), Avenida Alexandre Ferronato, n°1200, Setor Industrial, Sinop, Mato Grosso, 78.556-267, Brazil.
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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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Nascimento M, Piran R, Da Costa RM, Giordani MA, Carneiro FS, Aguiar DH, Dias MC, Sugizaki MM, Luvizotto RA, Nascimento AF, Bomfim GF. Hepatic injury induced by thioacetamide causes aortic endothelial dysfunction by a cyclooxygenase-dependent mechanism. Life Sci 2018; 212:168-175. [PMID: 30292829 DOI: 10.1016/j.lfs.2018.09.051] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 09/22/2018] [Accepted: 09/30/2018] [Indexed: 02/07/2023]
Abstract
Liver cirrhosis is associated with a wide range of cardiovascular abnormalities including hyperdynamic circulation and cirrhotic cardiomyopathy. The pathogenic mechanisms of these cardiovascular changes are multifactorial and include vascular dysregulations. AIM The present study tested the hypothesis that the systemic vascular hyporesponsiveness in thioacetamide (TAA)-induced liver injury model is dependent on nitric oxide (NO) and cyclooxygenase (COX) derivatives. MAIN METHODS Wistar rats were treated with TAA for eight weeks to induce liver injury. KEY FINDINGS The maximal contractile response in concentration-effect curves to phenylephrine was decreased in aorta from TAA-treated rats, but no differences were found in aorta without endothelium, suggesting an endothelium-dependent mechanism in decreased contractile response. There was no difference in the contractile response with and without L-NAME (N(ω)-nitro-l-arginine methyl ester) in rats with liver injury, showing that the TAA treatment impairs NO synthesis. Pre-incubation of the aorta with indomethacin, a COX-inhibitor, normalized the reduced contractile response to phenylephrine in arteries from TAA group. Also, COX-2 and iNOS (inducible nitric oxide syntase) protein expression was increased in aorta from TAA group compared to control group. Animals submitted to TAA treatment had a reduction in systolic blood pressure. Our findings demonstrated that liver injury induced by TAA caused a decrease in aortic contractile response by a COX-dependent mechanism but not by NO release. Also, it was demonstrated an inflammatory process in the aorta of TAA-treated rats by increased expression of COX-2 and iNOS. SIGNIFICANCE Therefore, there is an essential contribution of COX-2 activation in extra-hepatic vascular dysfunction and inflammation present in cirrhosis induced by TAA.
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Affiliation(s)
- M Nascimento
- Institute of Health Science, Federal University of Mato Grosso, Sinop, MT, Brazil
| | - R Piran
- Institute of Health Science, Federal University of Mato Grosso, Sinop, MT, Brazil
| | - R M Da Costa
- Department of Physiology, Institute of Health Sciences, Federal University of Goias, Jatai, Brazil
| | - M A Giordani
- Institute of Health Science, Federal University of Mato Grosso, Sinop, MT, Brazil
| | - F S Carneiro
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, Brazil
| | - D H Aguiar
- Institute of Health Science, Federal University of Mato Grosso, Sinop, MT, Brazil
| | - M C Dias
- Institute of Health Science, Federal University of Mato Grosso, Sinop, MT, Brazil
| | - M M Sugizaki
- Institute of Health Science, Federal University of Mato Grosso, Sinop, MT, Brazil
| | - R A Luvizotto
- Institute of Health Science, Federal University of Mato Grosso, Sinop, MT, Brazil
| | - A F Nascimento
- Institute of Health Science, Federal University of Mato Grosso, Sinop, MT, Brazil
| | - G F Bomfim
- Institute of Health Science, Federal University of Mato Grosso, Sinop, MT, Brazil.
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Pinotti MF, Matias AM, Sugizaki MM, Nascimento AFD, Pai MD, Leopoldo APL, Cicogna AC, Leopoldo AS. Fasting/Refeeding Cycles Prevent Myocardial Dysfunction and Morphology Damage in the Spontaneously Hypertensive Rats. Arq Bras Cardiol 2018; 111:400-409. [PMID: 30133552 PMCID: PMC6173345 DOI: 10.5935/abc.20180152] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 05/09/2018] [Indexed: 11/23/2022] Open
Abstract
Background Caloric restriction is known to impair the cardiac function and morphology in
hypertrophied hearts of spontaneously hypertensive rats (SHR); however, the
influence of fasting/refeeding (RF) is unknown. Objective To investigate the fasting/refeeding approach on myocardial remodeling and
function. In addition, the current study was designed to bring information
regarding the mechanisms underlying the participation of Ca2+
handling and β-adrenergic system. Methods Sixty-day-old male SHR rats were submitted to food ad
libitum (C), 50% food restriction (R50) or RF cycles
for 90 days. Cardiac remodeling was assessed by ultrastructure analysis and
isolated papillary muscle function. The level of significance considered was
5% (α = 0.05). Results The RF rats presented lower cardiac atrophy than R50 in relation
to C rats. The C rats increased weight gain, R50 maintained their
initial body weight and RF rats increased and decreased weight during RF.
The RF did not cause functional impairment because the isotonic and
isometric parameters showed similar behavior to those of C. The isotonic and
isometric cardiac parameters were significantly elevated in RF rats compared
to R50 rats. In addition, the R50 rats had cardiac
damage in relation to C for isotonic and isometric variables. While the
R50 rats showed focal changes in many muscle fibers, the RF
rats displayed mild alterations, such as loss or disorganization of
myofibrils. Conclusion Fasting/refeeding promotes cardiac beneficial effects and attenuates
myocardial injury caused by caloric restriction in SHR rats, contributing to
reduce the cardiovascular risk profile and morphological injuries.
Furthermore, RF promotes mild improvement in Ca2+ handling and
β-adrenergic system.
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Affiliation(s)
- Matheus Fécchio Pinotti
- Departamento de Clínica Médica, Faculdade de Medicina, Universidade Estadual Paulista (UNESP), Botucatu, SP - Brazil
| | - Amanda Martins Matias
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo (UFES), Vitória, ES - Brazil
| | | | | | - Maeli Dal Pai
- Departamento de Clínica Médica, Faculdade de Medicina, Universidade Estadual Paulista (UNESP), Botucatu, SP - Brazil.,Departamento de Morfologia, Instituto de Biosciências da Universidade Estadual Paulista UNESP, Botucatu, SP - Brazil
| | - Ana Paula Lima Leopoldo
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo (UFES), Vitória, ES - Brazil
| | - Antônio Carlos Cicogna
- Departamento de Clínica Médica, Faculdade de Medicina, Universidade Estadual Paulista (UNESP), Botucatu, SP - Brazil
| | - André Soares Leopoldo
- Departamento de Desportos, Centro de Educação Física e Desportos, Universidade Federal do Espírito Santo (UFES), Vitória, ES - Brazil
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Jacobsen BB, Leopoldo APL, Cordeiro JP, Campos DHSD, Nascimento AFD, Sugizaki MM, Cicogna AC, Padovani CR, Leopoldo AS. Cardiac, Metabolic and Molecular Profiles of Sedentary Rats in the Initial Moment of Obesity. Arq Bras Cardiol 2017; 109:432-439. [PMID: 29069204 PMCID: PMC5729779 DOI: 10.5935/abc.20170151] [Citation(s) in RCA: 2] [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: 11/21/2016] [Accepted: 04/28/2017] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Different types of high-fat and/or high-energy diets have been used to induce obesity in rodents. However, few studies have reported on the effects observed at the initial stage of obesity induced by high-fat feeding on cardiac functional and structural remodelling. OBJECTIVE To characterize the initial moment of obesity and investigate both metabolic and cardiac parameters. In addition, the role of Ca2+ handling in short-term exposure to obesity was verified. METHODS Thirty-day-old male Wistar rats were randomized into two groups (n = 19 each): control (C; standard diet) and high-fat diet (HF, unsaturated high-fat diet). The initial moment of obesity was defined by weekly measurement of body weight (BW) complemented by adiposity index (AI). Cardiac remodelling was assessed by morphological, histological, echocardiographic and papillary muscle analysis. Ca2+ handling proteins were determined by Western Blot. RESULTS The initial moment of obesity occurred at the 3rd week. Compared with C rats, the HF rats had higher final BW (4%), body fat (20%), AI (14.5%), insulin levels (39.7%), leptin (62.4%) and low-density lipoprotein cholesterol (15.5%) but did not exhibit alterations in systolic blood pressure. Echocardiographic evaluation did not show alterations in cardiac parameters. In the HF group, muscles were observed to increase their +dT/dt (C: 52.6 ± 9.0 g/mm2/s and HF: 68.0 ± 17.0 g/mm2/s; p < 0.05). In addition, there was no changes in the cardiac expression of Ca2+ handling proteins. CONCLUSION The initial moment of obesity promotes alterations to hormonal and lipid profiles without cardiac damage or changes in Ca2+ handling.
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Santos JA, Piccinelli AC, Formagio MD, Oliveira CS, dos Santos EP, Alves Stefanello MÉ, Lanza Junior U, Oliveira RJ, Sugizaki MM, Kassuya CAL. Antidepressive and antinociceptive effects of ethanolic extract and fruticuline A from Salvia lachnostachys Benth leaves on rodents. PLoS One 2017; 12:e0172151. [PMID: 28222143 PMCID: PMC5319787 DOI: 10.1371/journal.pone.0172151] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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: 08/11/2016] [Accepted: 01/31/2017] [Indexed: 12/16/2022] Open
Abstract
Objectives This study investigated the antidepressant and antinociceptive effects of ethanolic extract (SLEE) and pure fruticuline A obtained from Salvia lachnostachys leaves on rats and mice. Methods In this study, SLEE (100 mg/kg, p.o. route) was evaluated for its effects on spared nerve injury (SNI) in rats. The animals were submitted to mechanical sensitivity, forced swim (FST) and cold sensitivity tests 10 and 15 days after surgery. SLEE (100 mg/kg, p.o.) and fruticuline A (3 mg/kg, p.o.) were also evaluated with respect to nociceptive behavior induced by formalin. In addition, clonidine-induced depressive-like behavior was also analyzed. Results The oral administration of SLEE for up to 15 days and the subcutaneous injection of 10 mg/kg of ketamine (positive control) significantly inhibited SNI-induced mechanical hyperalgesia and decreased immobility in the FST. On the 15th day of oral treatment, SLEE prevented the SNI-induced increase in cold sensitivity. In the formalin test, SLEE and fruticuline A significantly reduced the frequency of paw licking during the first and second phases and decreased the formation of edema. In locomotor analysis (open field test without clonidine treatment), SLEE and fruticuline A did not alter the response. SLEE and fruticuline A significantly attenuated clonidine-induced suppression of spontaneous locomotor activity (squares invaded and licking) and emotionality (grooming and freezing) compared with controls, similar to the naive group. Conclusion SLEE exhibits antihyperalgesic, antidepressant, and antinociceptive effects, and fruticuline A appears to be at least partly responsible for the effects of SLEE. Together, these results demonstrate the antidepressive effects of SLEE and fruticuline A and indicate that both derivatives obtained from S. lachnostachys act against spontaneous neuropathic pain.
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Affiliation(s)
- Joyce Alencar Santos
- Federal University of Grande Dourados, College Exact Sciences and Technology, Dourados, Mato Grosso do Sul, Brazil
- * E-mail:
| | | | - Maira Dante Formagio
- Federal University of Grande Dourados, College of Health Science, Dourados, MS, Brazil
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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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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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Sugizaki MM, Leopoldo APL, Conde SJ, Campos DS, Damato R, Leopoldo AS, Nascimento AFD, Oliveira Júnior SDA, Cicogna AC. Exercício e restrição alimentar aumentam o RNAm de proteínas do trânsito de Ca2+ miocárdico em ratos. Arq Bras Cardiol 2011; 97:46-52. [DOI: 10.1590/s0066-782x2011005000066] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Accepted: 02/25/2011] [Indexed: 11/22/2022] Open
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Mendes ODC, Campos DHSD, Damatto RL, Sugizaki MM, Padovani CR, Okoshi K, Cicogna AC. [Cardiac remodeling: serial analysis and indexes for early detection of ventricular dysfunction]. Arq Bras Cardiol 2010; 94:62-70. [PMID: 20414528 DOI: 10.1590/s0066-782x2010000100011] [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] [Received: 11/05/2008] [Accepted: 06/05/2009] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Supravalvar aortic stenosis (SVAS) is used to study overload-induced cardiac remodeling (CR). In this model, neither CR behavior since beginning stage nor the best parameters to identify ventricular dysfunction are clearly stated. OBJECTIVE 1) Characterizing, early and evolutively, morphological and functional modifications during CR in rats with SVAS and 2) identifying the most sensitive index for detecting the moment when the diastolic and systolic dysfunction first appeared in the left ventricle (LV). METHODS Wistar Rats were divided into two groups - control (CG, n=13) and SVAS (SVASG, n=24) - and studied in post-surgical 3rd, 6th, 12th and 18th weeks. Hearts were analyzed by means of an echocardiogram (ECHO). RESULTS By the end of the experiment, ratios between the LV, right ventricle and atria and the final body weight were increased in the SVASG. The ECHO showed that the left atrium underwent significant remodeling from the 6th on. The percent of endocardial shortening underwent significant drop as of the 12nd week and the percent of, as of the 18th week, in the SVASG. The ratio between E- wave and A-wave (E/A) was higher in CG compared to the SVASG in all events analyzed. CONCLUSIONS During the remodeling process, the left ventricle of rats with SVAS presented concentric hypertrophy, early diastolic dysfunction and improvement of systolic function, with posterior performance deterioration. Besides this, the study found out the most sensitive echocardiographic indexes for detecting systolic and diastolic dysfunction are, respectively, the ratio E/A and the percent of endocardial shortening.
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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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Pinotti MF, Silva MDP, Sugizaki MM, Novelli YSD, Sant'ana LS, Aragon FF, Padovani CR, Novelli ELB, Cicogna AC. Influences of rich in saturated and unsaturated fatty acids diets in rat myocardium. Arq Bras Cardiol 2007; 88:346-53. [PMID: 17533478 DOI: 10.1590/s0066-782x2007000300015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2006] [Accepted: 06/22/2006] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES To study the influence of saturated (SFA) and unsaturated fatty acid (UFA) rich diets on mechanical function, morphology and oxidative stress in rat myocardium. METHODS Male, 60-day-old Wistar rats were fed a control (n=8), a SFA (n=8), or a UFA-rich diet (n=8) for sixty days. Mechanical function was studied in isolated left ventricle papillary muscle under isometric and isotonic contractions, in basal conditions (1.25 mM calcium chloride) and after 5.2 mM calcium chloride and beta-adrenergic stimuli with 1.0 microM isoproterenol. Left ventricle fragments were used to study oxidative stress and morphology under light and electron microscopy. RESULTS SFA and UFA-rich diets did not change myocardium mechanical function. Both diets caused oxidative stress, with high lipid hydroperoxide and low superoxide-dismutase concentrations. UFA rich diet decreased catalase expression and SFA rich diet decreased the amount of myocardial glutathione-peroxidase. Both diets promoted light ultrastructural injuries such as lipid deposits and cell membrane injuries. CONCLUSION Results suggest that SFA and UFA rich diets do not alter isolated muscle mechanical function, but promote light myocardial morphological injuries and oxidative stress.
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Carvalho RF, Dariolli R, Justulin Junior LA, Sugizaki MM, Politi Okoshi M, Cicogna AC, Felisbino SL, Dal Pai-Silva M. Heart failure alters matrix metalloproteinase gene expression and activity in rat skeletal muscle. Int J Exp Pathol 2007; 87:437-43. [PMID: 17222211 PMCID: PMC2517391 DOI: 10.1111/j.1365-2613.2006.00497.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Heart failure is associated with a skeletal muscle myopathy with cellular and extracellular alterations. The hypothesis of this investigation is that extracellular changes may be associated with enhanced mRNA expression and activity of matrix metalloproteinases (MMP). We examined MMP mRNA expression and MMP activity in Soleus (SOL), extensor digitorum longus (EDL), and diaphragm (DIA) muscles of young Wistar rat with monocrotaline-induced heart failure. Rats injected with saline served as age-matched controls. MMP2 and MMP9 mRNA contents were determined by RT-PCR and MMP activity by electrophoresis in gelatin-containing polyacrylamide gels in the presence of SDS under non-reducing conditions. Heart failure increased MMP9 mRNA expression and activity in SOL, EDL and DIA and MMP2 mRNA expression in DIA. These results suggest that MMP changes may contribute to the skeletal muscle myopathy during heart failure.
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Vizotto VA, Carvalho RF, Sugizaki MM, Lima AP, Aragon FF, Padovani CR, Castro AVB, Dal Pai-Silva M, Nogueira CR, Cicogna AC. Down-regulation of the cardiac sarcoplasmic reticulum ryanodine channel in severely food-restricted rats. Braz J Med Biol Res 2007; 40:27-31. [PMID: 17224993 DOI: 10.1590/s0100-879x2007000100004] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2006] [Accepted: 10/24/2006] [Indexed: 11/21/2022] Open
Abstract
We have shown that myocardial dysfunction induced by food restriction is related to calcium handling. Although cardiac function is depressed in food-restricted animals, there is limited information about the molecular mechanisms that lead to this abnormality. The present study evaluated the effects of food restriction on calcium cycling, focusing on sarcoplasmic Ca2+-ATPase (SERCA2), phospholamban (PLB), and ryanodine channel (RYR2) mRNA expressions in rat myocardium. Male Wistar-Kyoto rats, 60 days old, were submitted to ad libitum feeding (control rats) or 50% diet restriction for 90 days. The levels of left ventricle SERCA2, PLB, and RYR2 were measured using semi-quantitative RT-PCR. Body and ventricular weights were reduced in 50% food-restricted animals. RYR2 mRNA was significantly decreased in the left ventricle of the food-restricted group (control = 5.92 +/- 0.48 vs food-restricted group = 4.84 +/- 0.33, P < 0.01). The levels of SERCA2 and PLB mRNA were similar between groups (control = 8.38 +/- 0.44 vs food-restricted group = 7.96 +/- 0.45, and control = 1.52 +/- 0.06 vs food-restricted group = 1.53 +/- 0.10, respectively). Down-regulation of RYR2 mRNA expressions suggests that chronic food restriction promotes abnormalities in sarcoplasmic reticulum Ca2+ release.
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Affiliation(s)
- V A Vizotto
- Departamento de Clínica Médica, Faculdade de Medicina de Botucatu, Instituto de Biociências de Botucatu, Universidade Estadual Paulista Júlio Mesquista Filho, Botucatu, SP, Brasil
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Carvalho RF, Cicogna AC, Campos GER, da Silva Lopes F, Sugizaki MM, Nogueira CR, Pai-Silva MD. Heart failure alters MyoD and MRF4 expressions in rat skeletal muscle. Int J Exp Pathol 2006; 87:219-25. [PMID: 16709230 PMCID: PMC2517363 DOI: 10.1111/j.1365-2613.2006.00475.x] [Citation(s) in RCA: 12] [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] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Heart failure (HF) is characterized by a skeletal muscle myopathy with increased expression of fast myosin heavy chains (MHCs). The skeletal muscle-specific molecular regulatory mechanisms controlling MHC expression during HF have not been described. Myogenic regulatory factors (MRFs), a family of transcriptional factors that control the expression of several skeletal muscle-specific genes, may be related to these alterations. This investigation was undertaken in order to examine potential relationships between MRF mRNA expression and MHC protein isoforms in Wistar rat skeletal muscle with monocrotaline-induced HF. We studied soleus (Sol) and extensor digitorum longus (EDL) muscles from both HF and control Wistar rats. MyoD, myogenin and MRF4 contents were determined using reverse transcription-polymerase chain reaction while MHC isoforms were separated using polyacrylamide gel electrophoresis. Despite no change in MHC composition of Wistar rat skeletal muscles with HF, the mRNA relative expression of MyoD in Sol and EDL muscles and that of MRF4 in Sol muscle were significantly reduced, whereas myogenin was not changed in both muscles. This down-regulation in the mRNA relative expression of MRF4 in Sol was associated with atrophy in response to HF while these alterations were not present in EDL muscle. Taken together, our results show a potential role for MRFs in skeletal muscle myopathy during HF.
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Affiliation(s)
- Robson Francisco Carvalho
- Departamento de Morfologia, UNESP, BotucatuSão Paulo, Brazil
- Departamentos de Biologia Celular e Anatomia, UNICAMP, CampinasSão Paulo, Brazil
| | | | | | - Francis da Silva Lopes
- Departamentos de Biologia Celular e Anatomia, UNICAMP, CampinasSão Paulo, Brazil
- Departamento de Fisioterapia, UNOESTE, Presidente PrudenteBrazil
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Pinotti MF, Silva MDP, Sugizaki MM, Diniz YS, Sant'Ana LS, Aragon FF, Padovani CR, Novelli ELB, Cicogna AC. Effect of unsaturated fatty acids on myocardial performance, metabolism and morphology. Braz J Med Biol Res 2006; 39:305-12. [PMID: 16470320 DOI: 10.1590/s0100-879x2006000200019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Diets rich in saturated fatty acids are one of the most important causes of atherosclerosis in men, and have been replaced with diets rich in unsaturated fatty acids (UFA) for the prevention of this disorder. However, the effect of UFA on myocardial performance, metabolism and morphology has not been completely characterized. The objective of the present investigation was to evaluate the effects of a UFA-rich diet on cardiac muscle function, oxidative stress, and morphology. Sixty-day-old male Wistar rats were fed a control (N = 8) or a UFA-rich diet (N = 8) for 60 days. Myocardial performance was studied in isolated papillary muscle by isometric and isotonic contractions under basal conditions after calcium chloride (5.2 mM) and ss-adrenergic stimulation with 1.0 microM isoproterenol. Fragments of the left ventricle free wall were used to study oxidative stress and were analyzed by light microscopy, and the myocardial ultrastructure was examined in left ventricle papillary muscle. After 60 days the UFA-rich diet did not change myocardial function. However, it caused high lipid hydroperoxide (176 +/- 5 vs 158 +/- 5, P < 0.0005) and low catalase (7 +/- 1 vs 9 +/- 1, P < 0.005) and superoxide-dismutase (18 +/- 2 vs 27 +/- 5, P < 0.005) levels, and discrete morphological changes in UFA-rich diet hearts such as lipid deposits and mitochondrial membrane alterations compared to control rats. These data show that a UFA-rich diet caused myocardial oxidative stress and mild structural alterations, but did not change mechanical function.
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Affiliation(s)
- M F Pinotti
- Departamento de Clínica Médica, Faculdade de Medicina de Botucatu, Universidade Estadual Paulista Júlio de Mesquita Filho, Botucatu, SP, Brazil
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