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• W2023476087 abstract "Using stable isotopes of serine, glycine, and glutamine, the metabolism of serine and glycine was investigated in primary hepatocytes from six mid-gestation fetal lambs (mean gestational age = 81 ± 6 d, normal gestation = 145 d). Serine production was 6.84 ± 1.22 μmol/24 h/mg of DNA and exceeded serine utilization (3.76 ± 1.44 μmol/24 h/mg of DNA) with a resultant net increase in medium serine of 2.58 ± 1.70μmol/24 h/mg of DNA. In contrast, glycine production (6.84 ± 1.16μmol/24 h/mg of DNA) was less than glycine utilization (12.10 ± 1.78μmol/24 h/mg of DNA) with a net decline in medium glycine of -5.44 ± 2.03 μmol/24 h/mg of DNA. Of the serine produced, 50.4 ± 4.3% was derived from glycine via the action of serine hydroxymethyltransferase (SHMT) and the glycine cleavage enzyme complex (GCS). Increasing the medium serine concentration resulted in an increase in serine utilization and sparing of the utilization of other amino acids. Biosynthesis of glycine from serine accounts for only 18.1 ± 5.6% of glycine production, and this percentage is not affected by changes in medium serine concentration. Using 2,5-[15N2]glutamine as the tracer, an estimated 18 ± 7% of serine production was derived from transamination reactions. The specific activity of both cytosolic and mitochondrial SHMT was constant for the duration of the cultures. We conclude that, in mid-gestation fetal ovine hepatocytes, there is net production of serine (with glycine as the primary metabolic source of this serine biosynthesis) and net glycine utilization. These data suggest that flux through SHMT and GCS accounts for 50% of serine biosynthesis in mid-gestation fetal ovine hepatocytes. The sparing of the utilization of other amino acids by serine suggests that serine a conditionally essential amino acid for the mid-gestation fetal liver." @default.
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• W2023476087 date "1996-06-01" @default.
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• W2023476087 title "Serine and Glycine Metabolism in Hepatocytes from Mid Gestation Fetal Lambs" @default.
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• W2023476087 doi "https://doi.org/10.1203/00006450-199606000-00025" @default.
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