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- W2000497722 abstract "The present study compares the transplacental transport of L-[l-13C]serine and L-[l-13C]leucine in sheep. An in vivo preparation using twin gestations was set up such that the arterial circulation to one uterine horn, including its placenta and fetus, was infused with tracer serine and leucine while the umbilical circulations of both fetuses were sampled. Uterine and umbilical blood flows were measured in each horn. Plasma serine enrichments were 14.6 +/- 2.7% and 4.3 +/- 1.6% in the uterine veins draining the experimental and control horns, respectively. Fetal plasma leucine enrichments in the umbilical veins were 50 and 55% of the uterine venous enrichments in the control and experimental fetuses, respectively. By contrast, during 280 min of infusion, there was no detectable serine enrichment in either fetal circulation. However, significant plasma glycine enrichment was present in the fetal circulation of the experimental horn and venous glycine enrichments in the experimental horn were significantly greater than arterial glycine enrichments for both the umbilical (p < 0.02) and uterine (p < 0.001) circulations. We conclude that under conditions in which leucine transport is easily demonstrable there is no significant transplacental transport of maternal serine and that maternal plasma serine is used within the uteroplacental tissues for producing glycine, some of which is delivered into the fetal circulation." @default.
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- W2000497722 date "1993-06-01" @default.
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- W2000497722 title "Metabolism and Transport of Maternal Serine by the Ovine Placenta: Glycine Production and Absence of Serine Transport into the Fetus" @default.
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- W2000497722 doi "https://doi.org/10.1203/00006450-199306000-00012" @default.
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