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Experimental intrauterine growth retardation alters renal development
1Institute for Child Development, Division of Pediatrics, Tel Aviv Sourasky Medical Center, Beit Habriut Strauss, 14 Balfour Street, Tel Aviv 65211, Israel. child@netvision.net.il
Insights
Vascular placental insufficiency causes intrauterine growth retardation (IUGR) in newborns, leading to fewer glomeruli in their kidneys. This reduction may increase risks for neonatal kidney dysfunction and adult hypertension.
Area of Science:
- Perinatal Medicine
- Nephrology
- Developmental Biology
Background:
- Vascular placental insufficiency is a key factor in human intrauterine growth retardation (IUGR).
- IUGR newborns exhibit higher morbidity and mortality, with potential long-term health issues like hypertension.
- Reduced renal vascular supply during development can impact kidney function.
Purpose of the Study:
- To investigate the impact of simulated vascular placental insufficiency on fetal kidney development.
- To analyze the number of glomeruli in asymmetric IUGR rabbit fetuses.
- To explore the link between reduced glomeruli number and potential long-term renal consequences.
Main Methods:
- An experimental rabbit model was used to simulate vascular placental insufficiency.
- Uteroplacental vessels were ligated in 25-30% of fetuses during the last trimester.
- Kidneys were analyzed for relative estimated glomeruli number (REGN) using an unbiased, blind design.
Main Results:
- Ischemic fetuses were significantly smaller and asymmetric, with a disproportionately large head.
- A significant reduction in glomeruli number was observed in asymmetric IUGR rabbit fetuses.
- This reduction is likely attributed to decreased renal vascular supply.
Conclusions:
- Reduced glomeruli number in IUGR may impair renal function.
- This impairment could predispose neonates to renal dysfunction and adult hypertension.
- Early diagnosis and prevention of IUGR are clinically important.
Abstract:
Vascular placental insufficiency is considered a common pathogenic factor in human intrauterine growth retardation (IUGR), resulting in small-for-gestational-age, asymmetric newborns. IUGR neonates experience higher morbidity and mortality rates, as well as a possible contribution towards late sequelae, such as hypertension, and cardiovascular disease in adulthood. To simulate vascular placental insufficiency, an experimental rabbit IUGR model was used. Intrauterine growth retardation was achieved by ligation of 25-30% uteroplacental vessels of half of the fetuses during the last third of gestation. Ischemic fetuses were significantly small, asymmetric, and had a disproportionately small body with a relatively large head. The kidneys from all groups were analyzed for relative estimated glomeruli number (REGN) using an unbiased blind design. The glomeruli number was significantly reduced in the asymmetric IUGR rabbit fetuses, probably due to decreased renal vascular supply. Our results support the concept that the reduced number of glomeruli may contribute to impaired renal function, thus predisposing to neonatal renal dysfunction and late sequelae, such as adult hypertension. This study emphasizes the clinical importance of early IUGR diagnosis and prevention.