JOEL CLAUDIO HEIMANN
Projetos de Pesquisa
Unidades Organizacionais
Departamento de Clínica Médica, Faculdade de Medicina - Docente
LIM/16 - Laboratório de Fisiopatologia Renal, Hospital das Clínicas, Faculdade de Medicina - Líder
LIM/16 - Laboratório de Fisiopatologia Renal, Hospital das Clínicas, Faculdade de Medicina - Líder
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conferenceObject Effect of an angiotensin II type 2 receptor agonist on myocardial hypertrophy and fibrosis induced by high salt diet(2017) DOPONA, Ellen Priscila Brito; ROCHA, Veronica Favoni; OLIVEIRA, Ivone Braga de; FURUKAWA, Luzia Naoko Shinohara; HEIMANN, Joel ClaudioconferenceObject Transgenerational Effects of High Salt Diet During Gestation(2016) PERES, Maria Angelica; OLIVEIRA, Ivone Braga de; FURUKAWA, Luzia Naoko Shinohara; HEIMANN, Joel- Exposure to fine particulate matter in the air alters placental structure and the renin-angiotensin system(2017) SOTO, Sonia de Fatima; MELO, Juliana Oliveira de; MARCHESI, Guilherme D'Aprile; LOPES, Karen Lucasechi; VERAS, Mariana Matera; OLIVEIRA, Ivone Braga de; SOUZA, Regiane Machado de; CASTRO, Isac de; FURUKAWA, Luzia Naoko Shinohara; SALDIVA, Paulo Hilario Nascimento; HEIMANN, Joel C.Transforming growth factor beta 1 (TGF beta 1), the uteroplacental renin-angiotensin system (RAS) and vascular endothelial growth factor A (VEGF-A) participate in the placentation process. The aim of this study was to investigate the effects of exposure to pollutants on the placenta. Methods Female Wistar rats were exposed to filtered air (F) or to concentrated fine particulate matter (P) for 15 days. After mating, the rats were divided into four groups and again exposed to F or P (FF, FP, PF, PP) beginning on day 6 of pregnancy. At embryonic day 19, the placenta was collected. The placental structure, the protein and gene expression of TGF beta 1, VEGF-A, and its receptor Flk-1 and RAS were evaluated by indirect ELISA and quantitative real-time PCR. Results Exposure to P decreased the placental mass, size, and surface area as well as the TGF beta 1, VEGF-A and Flk-1 content. In the maternal portion of the placenta, angiotensin II (AngII) and its receptors AT(1) (AT(1)R) and AT(2) (AT(2)R) were decreased in the PF and PP groups. In the fetal portion of the placenta, AngII in the FP, PF and PP groups and AT(2)R in the PF and PP groups were decreased, but AT(1)R was increased in the FP group. VEGF-A gene expression was lower in the PP group than in the FF group. Conclusions Exposure to pollutants before and/or during pregnancy alters some characteristics of the placenta, indicating a possible impairment of trophoblast invasion and placental angiogenesis with possible consequences for the maternal-fetal interaction, such as a limitation of fetal nutrition and growth.
- Isolated total RNA and protein are preserved after thawing for more than twenty-four hours(2012) OLIVEIRA, Ivone Braga de; RAMOS, Debora Rothstein; LOPES, Karen Lucasechi; SOUZA, Regiane Machado de; HEIMANN, Joel Claudio; FURUKAWA, Luzia Naoko ShinoharaOBJECTIVE: The preservation of biological samples at a low temperature is important for later biochemical and/or histological analyses. However, the molecular viability of thawed samples has not been studied sufficiently in depth. The present study was undertaken to evaluate the viability of intact tissues, tissue homogenates, and isolated total RNA after defrosting for more than twenty-four hours. METHODS: The molecular viability of the thawed samples (n = 82) was assessed using the A260/A280 ratio, the RNA concentration, the RNA integrity, the level of intact mRNA determined by reverse transcriptase polymerase chain reaction, the protein level determined by Western blotting, and an examination of the histological structure. RESULTS: The integrity of the total RNA was not preserved in the thawed intact tissue, but the RNA integrity and level of mRNA were perfectly preserved in isolated defrosted samples of total RNA. Additionally, the level of beta-actin protein was preserved in both thawed intact tissue and homogenates. CONCLUSION: Isolated total RNA does not undergo degradation due to thawing for at least 24 hours, and it is recommended to isolate the total RNA as soon as possible after tissue collection. Moreover, the protein level is preserved in defrosted tissues.
conferenceObject Glucose metabolism and DNA methylation of offspring are altered by maternal sodium restriction(2013) SIQUEIRA, Flavia Ramos; PhuongSon Nguyen; KOBZIK, Lester; OLIVEIRA, Ivone Braga de; HEIMANN, Joel Claudio; FURUKAWA, Luzia Naoko ShinoharaObjective: To evaluate glucose metabolism of adult offspring of dams fed low sodium diet during pregnancy. Methods: Female Wistar rats (n= 6 – 8/group) were fed low (LS- 0.15%) or normal (NS-1.3% NaCl) salt diet since the 1st day of gestation until delivery or LS during 1st (LS10) or 2 nd half of gestation (LS20). Body weight (BW), circulating glucose, insulin, leptin and C-peptide levels, glucose (GTT) and insulin tolerance test (ITT) and leptin receptor (LR) methylation were measured in male (M) and female (F) offspring at 12 weeks of age Results (mean±SEM, p< 0.05): BW, at birth (g, n=14 – 27/group) (M: NS = 6.5±0.1, LS = 5.5±0.1, LS10 = 6±0.1, LS20 = 4.8±0.1, F: NS = 6±0.2, LS = 5±0.1, LS10 = 6±0.1, LS20 = 4±0.1) was lower in LS, LS10 and LS20 than in NS, while at adulthood it was not different. Glucose was higher in LS (M=115±3; F=110±4) than in the other groups (M: NS=103±1; LS10=100±2; LS20=96±2; F:NS=101±2; LS10=100±2; 108±2). C-peptide was higher in LS (M=1117±152; F=509±27) than in NS (M=375±41; F=233±63) and lower in LS20 (M=97±15; F=76±9) compared to LS10 (M=528±112; F=378±45).Glucose was higher in LS M and F at 5 minutes of the GTT compared to NS offspring. Leptin, insulin, and ITT were not different. But LR methylation was increased in LS20. Conclusion: Sodium restriction during pregnancy leads to low birth weight and to modifications of glucose metabolism and LR methylation.conferenceObject Compound 21 Prevents Salt Induced Myocardial Hypertrophy(2016) DOPONA, Ellen Priscila Brito; FAVONI, Veronica; OLIVEIRA, Ivone Braga de; HEIMANN, Joel ClaudioconferenceObject Low sodium intake is associated with low birth weight and size only when given in the second half of gestation(2012) SIQUEIRA, Flavia Ramos de; SOUZA, Regiane Machado de; OLIVEIRA, Ivone Braga de; FURUKAWA, Luzia Naoko S.; HEIMANN, Joel ClaudioThis study examined the effects of maternal low sodium intake during different periods of pregnancy on dams and male (M) and female (F) offspring. Methods: Female Wistar rats (n= 6 - 8/group) were fed low (LS - 0.15%) or normal (NS - 1.3% NaCl) sodium diet since the 1st day of gestation until delivery or LS during the 1st (LS10) or 2nd half of gestation (LS20). Results: (mean±SEM, p< 0.05): Maternal body weight (g) was lower in LS and LS20 than in NS and LS10 at the 3rd week of gestation (LS = 380±8.1; LS20 = 406±13.2; NS = 435±6.1, LS10 = 461±12.9). No difference was found in water and food intake among the groups. Also, no differences were observed in the litter size among experimental groups and no correlation betweenthe number of pups and maternal body weight at the 3rd week of gestation. At birth, body weight (g, n=14 to 27/group) (M: NS = 6.5±0.1, LS = 5.5±0.1, LS10 = 6.1±0.1, LS20 =4.8±0.1,F:NS = 6.1±0.2, LS = 5.2±0.1, LS10 = 5.6±0.1, LS20 = 4.1±0.1) and naso-anal length (cm, n=14 to 27) (M: NS = 5.1±0.02, LS = 4.9±0.03, LS10 = 5.0±0.03, LS20 = 4.6±0.03, F: NS =4.9±0.05,LS = 4.8±0.04, LS10 = 4.9±0.03, LS20 = 4.4±0.03) were lower in LS and LS20 than in NS offspring. Conclusion: Although maternal dietary intake was not influenced by dietary sodium content, maternal low sodium diet during the second half of gestation induced lower birth weight and size.conferenceObject Newborn cardiac structural alterations in response to salt restriction or overload during pregnancy(2016) SERAVALLI, Priscila; ZAGO, Breno Calazans; OLIVEIRA, Ivone Braga de; VERAS, Mariana Matera; HEIMANN, Joel- High and Low Salt Intake during Pregnancy: Impact on Cardiac and Renal Structure in Newborns(2016) SERAVALLI, Priscila; OLIVEIRA, Ivone Braga de; ZAGO, Breno Calazans; CASTRO, Isac de; VERAS, Mariana Matera; ALVES-RODRIGUES, Edson Nogueira; HEIMANN, Joel C.Introduction Previous studies from our laboratory demonstrated that dietary salt overload and salt restriction during pregnancy were associated with cardiac and renal structural and/or functional alterations in adult offspring. The present study evaluated renal and cardiac structure and the local renin-angiotensin system in newborns from dams fed high-, normal-or low-salt diets during pregnancy. Methods Female Wistar rats were fed low-(LS, 0.15% NaCl), normal-(NS, 1.3% NaCl) or high-(HS, 8% NaCl) salt diets during pregnancy. Kidneys and hearts were collected from newborns (n = 6-8/group) during the first 24 hours after birth to evaluate possible changes in structure using stereology. Protein expression of renin-angiotensin system components was evaluated using an indirect enzyme-linked immunosorbent assay (ELISA). Results No differences between groups were observed in total renal volume, volume of renal compartments or number of glomeruli. The transverse diameter of the nuclei of cardiomyocytes was greater in HS than NS males in the left and right ventricles. Protein expression of the AT1 receptor was lower in the kidneys of the LS than in those of the NS and HS males but not females. Protein expression of the AT2 receptor was lower in the kidneys of the LS males and females than in those of the NS males and females. Conclusion High salt intake during pregnancy induced left and right ventricular hypertrophy in male newborns. Salt restriction during pregnancy reduced the expression of renal angiotensin II receptors in newborns.