Farid Boubred1, Eloïse Delamaire2, Christophe Buffat3, Laurent Daniel4, Clair-Yves Boquien2, Dominique Darmaun2, Umberto Simeoni5. 1. Equipe d'accueil 2193, Division of Neonatology, Faculté de Médecine, Aix-Marseille Université, Marseille, France. 2. Institut national de la recherche agronomique, Université de Nantes UMR 1280, Physiologie des Adaptations Nutritionnelles, Nantes, France. 3. Laboratoire de biologie moléculaire, Assistance publique hôpitaix de Marseille, Aix-Marseille Université, Marseille, France. 4. Equipe d'accueil 3281, Faculté de Médecine, Aix-Marseille Université, Marseille, France. 5. Developmental origins of health and disease Laboratory, Université de Lausanne, Switzerland.
Abstract
BACKGROUND: Intrauterine growth restriction (IUGR) and postnatal nutrition are risk factors for cardiovascular and renal diseases in both humans and animals. The long-term renal effects of protein intake early in life remain unknown. The objective was to evaluate the effects of a neonatal feeding with high protein (HP) milk on renal functions and structure in IUGR male rats. METHODS: Maternal gestational low protein diet was used to produce IUGR. At day 5, IUGR pups were gastrostomized in the "pup-in-the cup" model and received either normal protein (NP) milk or HP (+50% protein content) milk until day 21. After weaning, the animals were fed the same standard diet. Renal functions and structure were assessed at postnatal day 18 (D18) and in adult offspring. RESULTS: During the preweaning period, the postnatal weight gain between the two groups was unaffected. On D18, kidneys from HP offspring were heavier with significant glomerular hypertrophy (+40%, P < 0.05). HP diet was associated with significant proteinuria and glomerulosclerosis (+49%, P < 0.05). Glomerular number was unaltered. CONCLUSION: Neonatal HP feeding following IUGR affects renal functions and structure at adulthood. These alterations may result from a single nephron glomerular hyperfiltration.
BACKGROUND: Intrauterine growth restriction (IUGR) and postnatal nutrition are risk factors for cardiovascular and renal diseases in both humans and animals. The long-term renal effects of protein intake early in life remain unknown. The objective was to evaluate the effects of a neonatal feeding with high protein (HP) milk on renal functions and structure in IUGR male rats. METHODS: Maternal gestational low protein diet was used to produce IUGR. At day 5, IUGR pups were gastrostomized in the "pup-in-the cup" model and received either normal protein (NP) milk or HP (+50% protein content) milk until day 21. After weaning, the animals were fed the same standard diet. Renal functions and structure were assessed at postnatal day 18 (D18) and in adult offspring. RESULTS: During the preweaning period, the postnatal weight gain between the two groups was unaffected. On D18, kidneys from HP offspring were heavier with significant glomerular hypertrophy (+40%, P < 0.05). HP diet was associated with significant proteinuria and glomerulosclerosis (+49%, P < 0.05). Glomerular number was unaltered. CONCLUSION: Neonatal HP feeding following IUGR affects renal functions and structure at adulthood. These alterations may result from a single nephron glomerular hyperfiltration.
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