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Difference of plasma leptin levels in venous and arterial cord blood: relation to neonatal and placental weight.
Kaohsiung Journal of Medical Sciences 1999 December
To investigate the physiological significance of umbilical plasma leptin in the fetal growth and its possible origin of production during pregnancy, plasma leptin concentrations in venous and arterial cord bloods were measured in 42 neonates (male = 23, female = 19, gestational age 36-41 weeks, birth weight 2600-4000 g). Leptin concentrations in umbilical veins (5.65 +/- 0.53 ng/mL, n = 42) and umbilical arteries (0.56 +/- 0.07 ng/mL, n = 42) were significantly (P < 0.001) lower than those in maternal peripheral veins (22.36 +/- 1.06 ng/mL, n = 42). Mean plasma leptin concentration (+/- SEM) in venous cord blood was significantly (P < 0.001) higher than that of arterial cord blood. There was significantly positive correlation (r = 0.447, P < 0.01) between umbilical venous leptin levels and neonatal body mass index (BMI). A positive correlation (r = 0.435, P < 0.01) was also found between umbilical arterial leptin and neonate BMI. There was no positive correlation between umbilical leptin levels in venous cord blood and placental weight. We thus conclude that umbilical plasma leptin may play an essential role in the fetal growth and metabolism during pregnancy and placenta is one of the major sources of leptin production, but the level of leptin in umbilico-placental circulation is independent of the weight of placenta.
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