LUZIA NAOKO SHINOHARA FURUKAWA
Projetos de Pesquisa
Unidades Organizacionais
Departamento de Clínica Médica, Faculdade de Medicina
LIM/16 - Laboratório de Fisiopatologia Renal, Hospital das Clínicas, Faculdade de Medicina
LIM/16 - Laboratório de Fisiopatologia Renal, Hospital das Clínicas, Faculdade de Medicina
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- Maternal high-sodium intake alters the responsiveness of the renin-angiotensin system in adult offspring(2012) RAMOS, Debora R.; COSTA, Nauilo L.; JANG, Karen L. L.; OLIVEIRA, Ivone B.; SILVA, Alexandre A. da; HEIMANN, Joel C.; FURUKAWA, Luzia N. S.Aims: The goal of the current study was to evaluate the impact of maternal sodium intake during gestation on the systemic and renal renin-angiotensin-aldosterone-system (RAAS) of the adult offspring. Main methods: Female Wistar rats were fed high- (HSD-8.0% NaCl) or normal-sodium diets (NSD-1.3% NaCl) from 8 weeks of age until the delivery of their first litter. After birth, the offspring received NSD. Tail-cuff blood pressure (TcBP) was measured in the offspring between 6 and 12 weeks of age. At 12 weeks of age, the offspring were subjected to either one week of HSD or low sodium diet (LSD-0.1 6%NaCl) feeding to evaluate RAAS responsiveness or to acute saline overload to examine sodium excretory function. Plasma (PRA) and renal renin content (RRC), serum aldosterone (ALDO) levels, and renal cortical and medullary renin mRNA expression levels were evaluated at the end of the study. Key findings: TcBP was higher among dams fed HSD, but no TcBP differences were observed among the offspring. Male offspring, however, exhibited increased TcBP after one week of HSD feeding, and this effect was independent of maternal diet. Increased RAAS responsiveness to the HSD and LSD was also observed in male offspring. The baseline levels of PRA. ALDO, and cortical and medullary renin gene expression were lower but the RRC levels were higher among HSD-fed male offspring (HSDoff). Conversely, female HSDoff showed reduced sodium excretion 4 h after saline overload compared with female NSDoff. Significance: High maternal sodium intake is associated with gender-specific changes in RAAS responsiveness among adult offspring.
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.