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Silva Pedroza AA, Bernardo EM, Pereira AR, Andrade Silva SC, Lima TA, de Moura Freitas C, da Silva Junior JC, Gomes DA, Ferreira DS, Lagranha CJ. Moderate offspring exercise offsets the harmful effects of maternal protein deprivation on mitochondrial function and oxidative balance by modulating sirtuins. Nutr Metab Cardiovasc Dis 2021; 31:1622-1634. [PMID: 33810953 DOI: 10.1016/j.numecd.2021.01.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 12/20/2020] [Accepted: 01/08/2021] [Indexed: 12/30/2022]
Abstract
BACKGROUND AND AIMS It has been demonstrated that maternal low protein during development induces mitochondrial dysfunction and oxidative stress in the heart. Moderate-intensity exercise in early life, conversely, increases the overall cardiac health. Thus, we hypothesize that moderate-intensity exercise performed during young age could ameliorate the deleterious effect of maternal protein deprivation on cardiac bioenergetics. METHODS AND RESULTS We used a rat model of maternal protein restriction during gestational and lactation period followed by an offspring treadmill moderate physical training. Pregnant rats were divided into two groups: normal nutrition receiving 17% of casein in the diet and undernutrition receiving a low-protein diet (8% casein). At 30 days of age, the male offspring were further subdivided into sedentary (NS and LS) or exercised (NT and LT) groups. Treadmill exercise was performed as follows: 4 weeks, 5 days/week, 60 min/day at 50% of maximal running capacity. Our results showed that a low-protein diet decreases oxidative metabolism and mitochondrial function associated with higher oxidative stress. In contrast, exercise rescues mitochondrial capacity and promotes a cellular resilience to oxidative stress. Up-regulation of cardiac sirtuin 1 and 3 decreased acetylation levels, redeeming from the deleterious effect of protein restriction. CONCLUSION Our findings show that moderate daily exercise during a young age acts as a therapeutical intervention opposing the harmful effects of a maternal diet restricted in protein.
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Affiliation(s)
| | - Elenilson M Bernardo
- Biochemistry and Physiology Graduate Program, Federal University of Pernambuco, Recife, PE, Brazil
| | - Allifer R Pereira
- Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV- Federal University of Pernambuco, Brazil
| | - Severina Cassia Andrade Silva
- Neuropsyquiatry and Behavior Science Graduate Program, Federal University of Pernambuco-UFPE, Recife, Pernambuco, Brazil
| | - Talitta A Lima
- Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV- Federal University of Pernambuco, Brazil
| | - Cristiane de Moura Freitas
- Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV- Federal University of Pernambuco, Brazil
| | - Jose Carlos da Silva Junior
- Neuropsyquiatry and Behavior Science Graduate Program, Federal University of Pernambuco-UFPE, Recife, Pernambuco, Brazil
| | - Dayane A Gomes
- Neuropsyquiatry and Behavior Science Graduate Program, Federal University of Pernambuco-UFPE, Recife, Pernambuco, Brazil
| | - Diorginis S Ferreira
- Colegiado de Educação Física, Federal University of São Franscisco Valley, Petrolina, Brazil
| | - Claudia J Lagranha
- Biochemistry and Physiology Graduate Program, Federal University of Pernambuco, Recife, PE, Brazil; Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV- Federal University of Pernambuco, Brazil; Neuropsyquiatry and Behavior Science Graduate Program, Federal University of Pernambuco-UFPE, Recife, Pernambuco, Brazil.
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Tappia PS, Ramjiawan B. Developmental origins of myocardial abnormalities in postnatal life 1. Can J Physiol Pharmacol 2018; 97:457-462. [PMID: 30398906 DOI: 10.1139/cjpp-2018-0446] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Poor quality and quantity maternal nutrition during pregnancy exerts permanent and damaging effects on the heart of the developing fetus. The developmental origin of adult heart disease is considered an important and critical factor in the pathogenesis of myocardial abnormalities in later life. Low birth mass, a marker of intrauterine stress, has been linked to a predisposition to heart disease. In this article, our work on the impact of exposure to a low-protein diet, in utero, on the developing heart and its long-term consequences are discussed. Other studies providing some supportive evidence are also described. It is proposed that normal fetal nutrition, growth, and development through efficient maternal nutrition (as well as other predisposing factors) before and during pregnancy may serve as a strategy for the primary prevention of heart disease.
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Affiliation(s)
- Paramjit S Tappia
- Asper Clinical Research Institute & Office of Clinical Research, St. Boniface Hospital, Winnipeg, MB R2H 2A6, Canada.,Asper Clinical Research Institute & Office of Clinical Research, St. Boniface Hospital, Winnipeg, MB R2H 2A6, Canada
| | - Bram Ramjiawan
- Asper Clinical Research Institute & Office of Clinical Research, St. Boniface Hospital, Winnipeg, MB R2H 2A6, Canada.,Asper Clinical Research Institute & Office of Clinical Research, St. Boniface Hospital, Winnipeg, MB R2H 2A6, Canada
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Carthagenes DS, Barreto MDP, Freitas CM, Pedroza ADS, Fernandes MP, Ferreira DS, Lagranha CJ, Nascimento LC, Evencio LB. Moderate physical training counterbalances harmful effects of low-protein diet on heart: metabolic, oxidative and morphological parameters. MOTRIZ: REVISTA DE EDUCACAO FISICA 2017. [DOI: 10.1590/s1980-6574201700030019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Rodríguez-Rodríguez P, López de Pablo AL, García-Prieto CF, Somoza B, Quintana-Villamandos B, Gómez de Diego JJ, Gutierrez-Arzapalo PY, Ramiro-Cortijo D, González MC, Arribas SM. Long term effects of fetal undernutrition on rat heart. Role of hypertension and oxidative stress. PLoS One 2017; 12:e0171544. [PMID: 28212445 PMCID: PMC5315302 DOI: 10.1371/journal.pone.0171544] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 01/23/2017] [Indexed: 02/07/2023] Open
Abstract
Background and aims Fetal undernutrition is a risk factor for heart disease in both genders, despite the protection of women against hypertension development. Using a rat model of maternal undernutrition (MUN) we aimed to assess possible sex differences in the development of cardiac alterations and the implication of hypertension and cardiac oxidative stress. Methods Male and female offspring from rats fed ad libitum (control) or with 50% of the normal daily intake during the second half of gestation (MUN) were used. Heart weight/body weight ratio (HW/BW), hemodynamic parameters (anaesthetized rats) and plasma brain natriuretic peptide (BNP, ELISA) were assessed in 21-day, 6-month and 22-month old rats. Plasma testosterone (ELISA) and cardiac protein expression of enzymes related to reactive oxygen species synthesis (p22phox, xanthine-oxidase) and degradation (catalase, Cu/Zn-SOD, Mn-SOD, Ec-SOD) were evaluated in 21-day and 6-month old rats (Western Blot). Heart structure and function was studied at the age of 22 months (echocardiography). Results At the age of 21 days MUN males exhibited significantly larger HW/BW and cardiac p22phox expression while females had reduced p22phox expression, compared to their respective sex-matched controls. At the age of 6-months, MUN males showed significantly larger blood pressure and cardiac xanthine-oxidase expression; MUN females were normotensive and had a lower cardiac expression of antioxidant enzymes, compared to their respective sex-matched controls. At the age of 22 months, both MUN males and females showed larger HW/BW and left ventricular mass and lower ejection fraction compared to sex-matched controls; only MUN males exhibited hypertension and a larger plasma BNP compared to aged male controls. Conclusions 1) During perinatal life females exposed to fetal undernutrition are protected from cardiac alterations, but in ageing they exhibit ventricular hypertrophy and functional loss, like MUN males; 2) cardiac oxidative stress might be implicated in the observed heart alterations in both sexes and 3) the severity of cardiac damage might be greater in males due to hypertension.
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Affiliation(s)
| | - Angel L. López de Pablo
- Departamento de Fisiología, Facultad de Medicina; Universidad Autónoma de Madrid, Madrid, Spain
| | - Concha F. García-Prieto
- Departamento de Ciencias Experimentales y de la Salud; Facultad de Farmacia, Universidad CEU-San Pablo, Madrid, Spain
| | - Beatriz Somoza
- Departamento de Ciencias Experimentales y de la Salud; Facultad de Farmacia, Universidad CEU-San Pablo, Madrid, Spain
| | - Begoña Quintana-Villamandos
- Departamento de Anestesiología y Reanimación; Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | | | | | - David Ramiro-Cortijo
- Departamento de Fisiología, Facultad de Medicina; Universidad Autónoma de Madrid, Madrid, Spain
| | - M. Carmen González
- Departamento de Fisiología, Facultad de Medicina; Universidad Autónoma de Madrid, Madrid, Spain
| | - Silvia M. Arribas
- Departamento de Fisiología, Facultad de Medicina; Universidad Autónoma de Madrid, Madrid, Spain
- * E-mail:
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Mitochondrial biogenesis is decreased in skeletal muscle of pig fetuses exposed to maternal high-energy diets. Animal 2016; 11:54-60. [PMID: 27349347 DOI: 10.1017/s1751731116001269] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Mitochondria plays an important role in the regulation of energy homeostasis. Moreover, mitochondrial biogenesis accompanies skeletal myogenesis, and we previously reported that maternal high-energy diet repressed skeletal myogenesis in pig fetuses. Therefore, the aim of this study was to evaluate the effects of moderately increased maternal energy intake on skeletal muscle mitochondrial biogenesis and function of the pig fetuses. Primiparous purebred Large White sows were allocated to a normal energy intake group (NE) as recommended by the National Research Council (NRC) and a high energy intake group (HE, 110% of NRC recommendations). On day 90 of gestation, fetal umbilical vein blood and longissimus (LM) muscle were collected. Results showed that the weight gain of sows fed HE diet was higher than NE sows on day 90 of gestation (P<0.05). Maternal HE diet increased fetal umbilical vein serum triglyceride and insulin concentrations (P<0.05), and tended to increase the homeostasis model assessment index (P=0.08). Furthermore, HE fetuses exhibited increased malondialdehyde concentration (P<0.05), and decreased activities of antioxidative enzymes (P<0.05) and intracellular NAD+ level (P<0.05) in LM muscle. These alterations in metabolic traits of HE fetuses were accompanied by reduced mitochondrial DNA amount (P<0.05) and down-regulated messenger RNA expression levels of genes responsible for mitochondrial biogenesis and function (P<0.05). Our results suggest that moderately increased energy supply during gestation decreases mitochondrial biogenesis, function and antioxidative capacity in skeletal muscle of pig fetuses.
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de Belchior ACS, Freire DD, da Costa CP, Vassallo DV, Padilha AS, Dos Santos L. Maternal protein restriction compromises myocardial contractility in the young adult rat by changing proteins involved in calcium handling. J Appl Physiol (1985) 2015; 120:344-50. [PMID: 26586904 DOI: 10.1152/japplphysiol.00246.2015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 11/17/2015] [Indexed: 01/21/2023] Open
Abstract
Maternal protein restriction (MPR) during pregnancy is associated with increased cardiovascular risk in the offspring in adulthood. In this study we evaluated the cardiac function of young male rats born from mothers subjected to MPR during pregnancy, focusing on the myocardial mechanics and calcium-handling proteins. After weaning, rats received normal diet until 3 mo old, when the following parameters were assessed: arterial and left ventricular hemodynamics and in vitro cardiac contractility in isolated papillary muscles. The body weight was lower and arterial pressure higher in the MPR group compared with young adult offspring of female rats that received standard diet (controls); and left ventricle time derivatives increased in the MPR group. The force developed by the cardiac muscle was similar; but time to peak and relaxation time were longer, and the derivatives of force were depressed in the MPR. In addition, MPR group exhibited decreased post-pause potentiation of force, suggesting reduced reuptake function of the sarcoplasmic reticulum. Corroborating, the myocardial content of SERCA-2a and phosphorylated PLB-Ser16/total PLB ratio was decreased and sodium-calcium exchanger was increased in the MPR group. The contraction dependent on transsarcolemmal influx of calcium was higher in MPR if compared with the control group. In summary, young rats born from mothers subjected to protein restriction during pregnancy exhibit changes in the myocardial mechanics with altered expression of calcium-handling proteins, reinforcing the hypothesis that maternal malnutrition is related to increased cardiovascular risk in the offspring, not only for hypertension, but also cardiac dysfunction.
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Affiliation(s)
- Aucelia C S de Belchior
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, PE, Brazil; Department of Physiological Sciences, Federal University of Espirito Santo, Vitória, ES, Brazil; and
| | - David D Freire
- Department of Physiological Sciences, Federal University of Espirito Santo, Vitória, ES, Brazil; and Department of Physiological Sciences, EMESCAM, Vitória, ES, Brazil
| | - Carlos P da Costa
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, PE, Brazil
| | - Dalton V Vassallo
- Department of Physiological Sciences, Federal University of Espirito Santo, Vitória, ES, Brazil; and Department of Physiological Sciences, EMESCAM, Vitória, ES, Brazil
| | - Alessandra S Padilha
- Department of Physiological Sciences, Federal University of Espirito Santo, Vitória, ES, Brazil; and
| | - Leonardo Dos Santos
- Department of Physiological Sciences, Federal University of Espirito Santo, Vitória, ES, Brazil; and
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Zohdi V, Lim K, Pearson JT, Black MJ. Developmental programming of cardiovascular disease following intrauterine growth restriction: findings utilising a rat model of maternal protein restriction. Nutrients 2014; 7:119-52. [PMID: 25551250 PMCID: PMC4303830 DOI: 10.3390/nu7010119] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 12/08/2014] [Indexed: 12/11/2022] Open
Abstract
Over recent years, studies have demonstrated links between risk of cardiovascular disease in adulthood and adverse events that occurred very early in life during fetal development. The concept that there are embryonic and fetal adaptive responses to a sub-optimal intrauterine environment often brought about by poor maternal diet that result in permanent adverse consequences to life-long health is consistent with the definition of "programming". The purpose of this review is to provide an overview of the current knowledge of the effects of intrauterine growth restriction (IUGR) on long-term cardiac structure and function, with particular emphasis on the effects of maternal protein restriction. Much of our recent knowledge has been derived from animal models. We review the current literature of one of the most commonly used models of IUGR (maternal protein restriction in rats), in relation to birth weight and postnatal growth, blood pressure and cardiac structure and function. In doing so, we highlight the complexity of developmental programming, with regards to timing, degree of severity of the insult, genotype and the subsequent postnatal phenotype.
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Affiliation(s)
- Vladislava Zohdi
- Department of Anatomy and Developmental Biology, Monash University, Melbourne, VIC 3800, Australia.
| | - Kyungjoon Lim
- Neuropharmacology Laboratory, Baker IDI Heart and Diabetes Institute, P.O. Box 6492 St Kilda Rd Central, Melbourne 8008, Australia.
| | - James T Pearson
- Department of Physiology, Monash University, Melbourne, VIC 3800, Australia.
| | - M Jane Black
- Department of Anatomy and Developmental Biology, Monash University, Melbourne, VIC 3800, Australia.
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Nascimento L, Freitas CM, Silva-Filho R, Leite ACR, Silva AB, da Silva AI, Ferreira DS, Pedroza AA, Maia MBS, Fernandes MP, Lagranha C. The effect of maternal low-protein diet on the heart of adult offspring: role of mitochondria and oxidative stress. Appl Physiol Nutr Metab 2014; 39:880-7. [DOI: 10.1139/apnm-2013-0452] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Protein restriction during perinatal and early postnatal development is associated with a greater incidence of disease in the adult, such arterial hypertension. The aim in the present study was to investigate the effect of maternal low-protein diet on mitochondrial oxidative phosphorylation capacity, mitochondrial reactive oxygen species (ROS) formation, antioxidant levels (enzymatic and nonenzymatic), and oxidative stress levels on the heart of the adult offspring. Pregnant Wistar rats received either 17% casein (normal protein, NP) or 8% casein (low protein, LP) throughout pregnancy and lactation. After weaning male progeny of these NP or LP fed rats, females were maintained on commercial chow (Labina-Purina). At 100 days post-birth, the male rats were sacrificed and heart tissue was harvested and stored at −80 °C. Our results show that restricting protein consumption in pregnant females induced decreased mitochondrial oxidative phosphorylation capacity (51% reduction in ADP-stimulated oxygen consumption and 49.5% reduction in respiratory control ratio) in their progeny when compared with NP group. In addition, maternal low-protein diet induced a significant decrease in enzymatic antioxidant capacity (37.8% decrease in superoxide dismutase activity; 42% decrease in catalase activity; 44.8% decrease in glutathione-S-transferase activity; 47.9% decrease in glutathione reductase; 25.7% decrease in glucose-6 phosphate dehydrogenase) and glutathione level (34.8% decrease) when compared with control. From these findings, we hypothesize that an increased production of ROS and decrease in antioxidant activity levels induced by protein restriction during development could potentiate the progression of metabolic and cardiac diseases in adulthood.
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Affiliation(s)
- Luciana Nascimento
- Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV-Federal University of Pernambuco, Brazil
| | - Cristiane M. Freitas
- Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV-Federal University of Pernambuco, Brazil
| | - Reginaldo Silva-Filho
- Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV-Federal University of Pernambuco, Brazil
| | - Ana Catarina R. Leite
- Department of Physiology and Pharmacology, CCB-Federal University of Pernambuco, Recife, PE, Brazil
| | - Alessandra B. Silva
- Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV-Federal University of Pernambuco, Brazil
| | - Aline Isabel da Silva
- Ph.D. student in Nutrition Program, Federal University of Pernambuco, Recife, PE, Brazil
| | - Diorginis Soares Ferreira
- Ph.D. student in Neuropsychiatry and Behavioral Sciences Program, Federal University of Pernambuco, Recife, PE, Brazil
| | - Anderson Apolonio Pedroza
- Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV-Federal University of Pernambuco, Brazil
| | | | - Mariana P. Fernandes
- Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV-Federal University of Pernambuco, Brazil
| | - Claudia Lagranha
- Laboratory of Biochemistry and Exercise Biochemistry, Department of Physical Education and Sports Science, CAV-Federal University of Pernambuco, Brazil
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Oliveira Junior SA, Padovani CR, Rodrigues SA, Silva NR, Martinez PF, Campos DH, Okoshi MP, Okoshi K, Dal-Pai M, Cicogna AC. Extensive impact of saturated fatty acids on metabolic and cardiovascular profile in rats with diet-induced obesity: a canonical analysis. Cardiovasc Diabetol 2013; 12:65. [PMID: 23587409 PMCID: PMC3679825 DOI: 10.1186/1475-2840-12-65] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 04/06/2013] [Indexed: 12/25/2022] Open
Abstract
Background Although hypercaloric interventions are associated with nutritional, endocrine, metabolic, and cardiovascular disorders in obesity experiments, a rational distinction between the effects of excess adiposity and the individual roles of dietary macronutrients in relation to these disturbances has not previously been studied. This investigation analyzed the correlation between ingested macronutrients (including sucrose and saturated and unsaturated fatty acids) plus body adiposity and metabolic, hormonal, and cardiovascular effects in rats with diet-induced obesity. Methods Normotensive Wistar-Kyoto rats were submitted to Control (CD; 3.2 Kcal/g) and Hypercaloric (HD; 4.6 Kcal/g) diets for 20 weeks followed by nutritional evaluation involving body weight and adiposity measurement. Metabolic and hormonal parameters included glycemia, insulin, insulin resistance, and leptin. Cardiovascular analysis included systolic blood pressure profile, echocardiography, morphometric study of myocardial morphology, and myosin heavy chain (MHC) protein expression. Canonical correlation analysis was used to evaluate the relationships between dietary macronutrients plus adiposity and metabolic, hormonal, and cardiovascular parameters. Results Although final group body weights did not differ, HD presented higher adiposity than CD. Diet induced hyperglycemia while insulin and leptin levels remained unchanged. In a cardiovascular context, systolic blood pressure increased with time only in HD. Additionally, in vivo echocardiography revealed cardiac hypertrophy and improved systolic performance in HD compared to CD; and while cardiomyocyte size was unchanged by diet, nuclear volume and collagen interstitial fraction both increased in HD. Also HD exhibited higher relative β-MHC content and β/α-MHC ratio than their Control counterparts. Importantly, body adiposity was weakly associated with cardiovascular effects, as saturated fatty acid intake was directly associated with most cardiac remodeling measurements while unsaturated lipid consumption was inversely correlated with these effects. Conclusion Hypercaloric diet was associated with glycemic metabolism and systolic blood pressure disorders and cardiac remodeling. These effects directly and inversely correlated with saturated and unsaturated lipid consumption, respectively.
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Zohdi V, Wood BR, Pearson JT, Bambery KR, Black MJ. Evidence of altered biochemical composition in the hearts of adult intrauterine growth-restricted rats. Eur J Nutr 2012; 52:749-58. [PMID: 22645107 DOI: 10.1007/s00394-012-0381-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2012] [Accepted: 05/10/2012] [Indexed: 02/07/2023]
Abstract
PURPOSE Epidemiological studies clearly link intrauterine growth restriction with increased risk of cardiac disease in adulthood. The mechanisms leading to this increased risk are poorly understood; remodeling of the myocardium is implicated. The aim was to determine the effect of early life growth restriction on the biochemical composition of the left ventricular myocardium in adult rats. METHODS Wistar Kyoto dams were fed either a low protein diet (LPD; 8.7 % casein) or normal protein diet (NPD; 20 % casein) during pregnancy and lactation; from weaning, the offspring were fed normal rat chow. At 18 weeks of age, the biochemical composition of the hearts of NPD control (n = 9) and LPD intrauterine growth-restricted (n = 7) offspring was analyzed using Fourier Transform Infrared (FTIR) micro-spectroscopy. RESULTS Body weights at postnatal day 4 were significantly lower and remained lower throughout the experimental period in the LPD offspring compared to controls. FTIR analysis of the infrared absorption spectra across the whole "fingerprint" region (1,800-950 cm(-1)) demonstrated wider variation in absorbance intensity in the LPD group compared to controls. In particular, there were marked differences detected in the protein (1,540 cm(-1)), lipid (1,455 and 1,388 cm(-1)), proteoglycan (1,228 cm(-1)) and carbohydrate (1,038 cm(-1)) bands, indicating increased lipid, proteoglycan and carbohydrate content in the growth-restricted myocardium. CONCLUSION In conclusion, changes in the biochemical composition of the myocardium provide a likely mechanism for the increased vulnerability to cardiovascular disease in offspring that were growth restricted in early life.
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Affiliation(s)
- Vladislava Zohdi
- Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
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