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Master's Dissertation
DOI
https://doi.org/10.11606/D.5.2009.tde-25062009-105317
Document
Author
Full name
Nauilo Lima Costa
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Furukawa, Luzia Naoko Shinohara (President)
Dolnikoff, Miriam Sterman
Gil, Frida Zaladek
Title in Portuguese
Sobrecarga de sal durante o período perinatal: efeito sobre a modulação do sistema renina-angiotensina em resposta à variação no consumo de sal na prole adulta
Keywords in Portuguese
Ciclooxigenase 2
Cloreto de sódio na dieta
Dieta hipossódica
Gravidez
Hipertensão
Inibidores da enzima conversora de angiotensina
Óxido nítrico sintase Tipo 1
Sistema renina-angiotensina
Abstract in Portuguese
O objetivo deste estudo foi avaliar se a sobrecarga de sal durante a gestação interfere na liberação de renina renal e circulante e a sua relação com a COX-2 e nNOS no rim após estimulo ou inibição do sistema renina angiotensina (SRA) nas proles femininas adultas. Ratas fêmeas Wistar receberam dieta normossódica (1,3%), hipersódica 4,0% ou hipersódica 8,0%NaCl durante a gestação. Ao nascimento, as proles receberam dieta normossódica. As proles com 12 semanas de vida foram submetidas ao teste de restrição (0,15%) ou a sobrecarga de sódio (8,0%NaCl). Foram avaliados pesos corpóreos, a pressão arterial, atividades da renina plasmática e renal; porcentagem de ramos vasculares com grânulos de renina, nitrito sérico; expressão do mRNA e protéica de renina, COX-2 e nNOS no córtex e medula renal. A pressão arterial, peso corpóreo, atividade da renina plasmática e renal não foram diferentes entre os grupos. A prole HR1 apresentou modulação do SRA, enquanto que prole HR2 não apresentou modulação adequada frente à restrição ou sobrecarga de sódio. Além disso, a expressão do mRNA da renina, COX-2 e nNOS foi estimulada na medula, e diminuída no córtex renal das proles HR1 diante da restrição ou sobrecarga de sódio. Em conclusão, a sobrecarga de sódio durante a gestação modifica as respostas do sistema renina-angiotensina, da COX-2 e da nNOS diante de subseqüente restrição e sobrecarga de sódio nas proles femininas adultas.
Title in English
Dietary salt load during perinatal period: effects on the reninangiotensin system in response to sodium intake in the adult offspring rat
Keywords in English
Angiotensin-conversive enzyme inhibitors
Cyclooxygenase 2
Diet sodium-restricted
Hypertension
Nitric oxide synthase Type 1
Pregnancy
Renin-angiotensin system
Sodium chloride dietary
Abstract in English
The objective was to evaluate whether mother high salt diet interferes in circulating and local renin release and its relation to kidney COX-2 and nNOS under RAS stimulation or inhibition by sodium in female offspring. Female rats were fed a normal (1,3%NaCl, NSD) or high 1 (4,0%, HSD1) or high 2 (8,0%, HSD2) diet throughout pregnancy. Mating occurred on the 12th week of age. From birthday, the offspring received normal salt diet. In adult offspring; plasma, renal renin activity, granulated renin cell, serum Nox, medullar and cortical renin, COX-2 and nNOS mRNA and protein expression were measured in basal condition and after one week of RAS stimulation or inhibition by sodium. Results: In basal condition, renin activity was not different among groups; however HSD1 offspring was more responsive to RAS stimulation or inhibition. Medulla COX-2 and nNOS mRNA of HSD1 offspring were decreased in basal conditions and they were more responsive to RAS stimulation or inhibition. Enhanced responses of circulating and local renin, COX-2 and nNOS to RAS stimulation or inhibition by sodium in offspring from maternal high salt diet during pregnancy lead to activation of renin angiotensin system, prostaglandin and nitric oxide pathways, and could be origin of hypertension in late life.
 
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NauiloLCosta.pdf (1.89 Mbytes)
Publishing Date
2009-06-29
 
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