Possible Implications of Placental Expressions for Heat Shock Protein 70 and Lectin-like Oxidized Low Density Lipoprotein Receptor-1 on Postnatal Blood Pressure in Their Newborns / 체질인류학회지

The 'fetal origin' hypothesis propose the alteration in fetal environment result in developmental adaptation, the permanently change in structure, physiology and metabolism, thereby predisposing to cardiovascular, metabolic and endocrine disease in adult life. Evidence is accumulating that the fetal environment affects newborn cardiac structure and function in humans, and blood pressure (BP) in newborn predicts the likelihood of developing hypertension in adult life. However, few studies have reported the influence of fetal factors on BP in neonates and an attempt to relate fetal factors to a neonate's BP seems to be important to identify individuals at risk of developing hypertension later in life. As the placenta is the regulator of nutrient composition and supply from mother to fetus and the source of hormonal signals that affect maternal and fetal metabolism, appropriate development of the placenta is crucial to normal fetal development. By virtue of these roles the placenta is in a key position to play a direct role in fetal programming. The aim of this study was to evaluate positive relationship between placental oxidative stress and BP in their healthy newborn offsprings, and propose to relate fetal factors to a neonatal BP. Systemic blood pressure was measured by automated device in 68 healthy term newborns who were born at Ewha Womans Medical Center, and their tissue samples of placentas were obtained from 40 cases which are 20 cases from high neonatal blood pressure group and 20 cases from low neonatal blood pressure group. We investigated placental expressions for heat shock protein (HSP) 70 and lectin-like oxidized low density lipoprotein receptor-1 (LOX-1), as markers for placental oxidative stress using immunohistochemistry and Western blot analysis, and evaluated their association with BP in healthy term newborn babies. The mean values of placental LOX-1 and HSP 70 were significantly higher in newborns with high BP group compared to those with low BP group. Increase in placental oxidative stress was associated with higher newborn systolic blood pressure. These findings suggest that newborn blood pressure may represent prenatal influence on cardiac structure and function.

The influence of some intrauterine growth variables on neonatal blood pressure / 소아과

PURPOSE: 'Programming' describes the process that stimulus at a critical period of development has lifelong effects. The fact that low birth weight links to the risk of elevated blood pressures in adult life is well known. This study aims to examine whether this link is evident in the newborn by investigating the relationship of the intrauterine growth indices and neonatal blood pressure(BP). METHODS: We studied 127 neonates who were born at Ewha Womans' Hospital and their mothers enrolled our cohort study during pregnancy. Data on the mothers and details of the birth records were tracked and collected from medical charts. Neonatal BP was measured within 24 hours after birth. RESULTS: Neonatal SBP was positively correlated to intrauterine growth indices; birth weight(BW)(r= 0.4), head circumference(HC)(r=0.4), and birth height(r=0.3). However, an inverse relationship existed, between HC/BW ratio and neonatal SBP(r=-0.4). After adjusting for the baby's sex, maternal BP, and gestational age, neonatal SBP still associated with intrauterine growth indices. SBP was 7 mmHg higher in the highest BW group(> or =90 percentiles) compared to the lowest group( or =90 percentiles) compared in the lowest group(<10 percentiles). CONCLUSION: This study could not find the evidence that intrauterine growth retardation affect on elevated neonatal BP. It suggests that the initiating events of BP programming may occur during postnatal growth period. To identify the critical starting period that intrauterine growth retardation leads to elevated BP, a study tracking BP changes from birth to childhood is required.