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pubmed-article:4008897pubmed:abstractTextLactate is produced by the sheep placenta and is an important metabolic substrate for fetal sheep. However, lactate uptake and release by the fetal liver have not been assessed directly. We measured lactate flux across the liver in 16 fetal sheep at 129 (120-138) days gestation that had catheters chronically maintained in the fetal descending aorta, inferior vena cava, right or left hepatic vein, and umbilical vein. Lactate and hemoglobin concentrations and oxygen saturation were measured in blood drawn from all vessels. Umbilical venous, portal venous, and hepatic blood flow were measured by injecting radionuclide-labeled microspheres into the umbilical vein while obtaining a reference sample from the descending aorta. We found net hepatic uptake of lactate (5.0 +/- 4.4 mg/min per 100 g liver). A large quantity of lactate was delivered to the liver (94.2 +/- 78.1 mg/min per 100 g), so that the hepatic extraction of lactate was only 7.7 +/- 6.5%. Hepatic oxygen consumption was 3.18 +/- 3.3 ml/min per 100 g, and the hepatic lactate/oxygen quotient was 2.07 +/- 1.54. There was no significant correlation between hepatic lactate uptake and hepatic lactate or glucose delivery, hepatic oxygen consumption, hepatic blood flow, hepatic glucose flux, total body oxygen consumption, arterial pH, oxygen content, or oxygen saturation. There was, however, a significant correlation between hepatic lactate uptake and umbilical lactate uptake (r = 0.74, P less than 0.005) such that net hepatic lactate uptake was nearly equivalent to that produced across the umbilical-placental circulation.(ABSTRACT TRUNCATED AT 250 WORDS)lld:pubmed
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pubmed-article:4008897pubmed:authorpubmed-author:RudolphA MAMlld:pubmed
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pubmed-article:4008897pubmed:authorpubmed-author:RudolphC DCDlld:pubmed
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pubmed-article:4008897pubmed:pagination177-83lld:pubmed
pubmed-article:4008897pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:4008897pubmed:articleTitleLactate uptake by the fetal sheep liver.lld:pubmed
pubmed-article:4008897pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:4008897pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:4008897pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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