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Efeitos da sobrecarga calórica em ratos machos submetidos ou não a restrição protéica in útero

Authors: Rizzi, Victor Hugo Gonçalves;

Efeitos da sobrecarga calórica em ratos machos submetidos ou não a restrição protéica in útero

Abstract

Background. Prior studies show that maternal protein-restricted offspring (LP) have pronounced reduction of nephron number and arterial hypertension associated with unchanged glomerular filtration rate and enhanced glomerular area that may be related with glomerular hyperfiltration/overflow and account for the glomerular filtration barrier breakdown and early glomerulosclerosis. Additionally, evidence is emerging that highlights the far-reaching consequences of high fat diet (HFD) on kidney morphology and function disorders. The present study aims to evaluate the effect of HFD on renal function and morphology in LP rats. Methods. Maternal protein-restricted offspring (LP, 6% casein) and normal protein intake rats (NP, 17% casein) were submitted to ingestion of HFD (LPH and NPH, respectively) or standard chow to rodents (LPN and NPN) from 8th to 13th of age. Renal Function, systemic arterial pressure, immunohistochemistry and scanning electron microscopy were performed and biochemical serum parameters analyzed. Results. The body adiposity and mass were reduced in LPN which in turn, increased in NPH and LPH groups. Striking increased in total cholesterol was observed in NPH and LPH, and increased LDL in LPH. The blood pressure was significant increase in LPH groups from the 10th and 12th week of life compared to the other groups. A reduced urinary excretion of sodium was observed in low-protein treated rats while NPH and LPH animals presented an increased urinary acidification in time-dependent fashion. The LPN, NPH and LPH groups showed an increased expression of AT1r, transforming growth factor (TGFβ-1), collagen and fibronectin. By ultraestructural analysis we found a pronounced enfacement of foot process in treated groups and HFD-treated offspring showed wear-out of podocytes by rupture of cell membranes. In parallel all treated rats present a significant urinary protein excretion. Conclusion. In conclusion, from our present ...

Introdução. Estudos anteriores mostram que a restrição proteica gestacional é responsável pela redução do número de néfrons e hipertensão arterial. O aumento da pressão arterial leva a uma hiperfiltração glomerular e consequentemente ruptura da barreira de filtração, com início do quadro de glomeruloesclerose. Além disso, evidências destacam as consequências da dieta hiperlipídica sobre a morfologia e distúrbios funcionais renais. O presente estudo tem como objetivo avaliar o efeito da sobrecarga calórica por dieta hiperlipídica sobre a função e morfologia renal em ratos submetidos à restrição proteica gestacional. Método. Após confirmação da prenhez as ratas foram divididos em 2 grupos, sendo grupo NP (normal protein - 17% de caseína na gestação) e grupo LP (low protein - 6% de caseína durante a gestação). Após nascimento a prole de ratos machos foi mantida com ração normal, sendo que da 8ª até a 13ª semana de vida essa prole foi submetida à dieta hiperlipídica (grupos LPH e NPH) ou ração padrão para roedores (grupo LPN e NPN). Foram realizadas análises da função renal, aferição da pressão arterial, imunohistoquímica, microscopia eletrônica de varredura e análise bioquímica do perfil lipídico. Resultados. O índice de adiposidade estava reduzido em LPN e aumentado nos grupos NPH e LPH. Observamos aumento da concentração de colesterol total em NPH e LPH, e aumento de colesterol LDL em LPH. A pressão arterial estava significativamente aumentada nos animais do grupo LPH na 10ª e 12ª semana de vida, comparado aos outros grupos no mesmo período. A menor excreção urinária de sódio foi observada nos grupos tratados, enquanto os animais NPH e LPN apresentaram aumento da acidificação urinária de forma tempo-dependente da dieta hiperlipídica. Os grupos LPN, NPH e LPH mostraram um aumento da expressão de AT1r, fator de transformação do crescimento beta (TGFβ-1), colágeno ...

Pós-graduação em Biologia Geral e Aplicada - IBB

Country
Brazil
Keywords

Histologia, Proteínas, Caloric restriction, Restrição calórica, Fisiologia, Utero, Rins - Doenças

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green