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• W2006558672 abstract "The impact of hepatic dysfunction on the elimination and hydrolysis of three potential tyrosine sources for total parenteral nutrition, the dipeptides L-alanyl-L-tyrosine (Ala-Tyr) and glycyl-L-tyrosine (Gly-Tyr), and N-acetyl-L-tyrosine (Nac-Tyr) were evaluated in six patients with hepatic failure (five chronic, one acute) and seven healthy subjects. In controls, whole-body clearance (Cltot) of Ala-Tyr was higher than of Gly-Tyr (3,169 +/- 214 vs. 1,780 +/- 199 mL/kg/min, P < .01), and both exceeded clearance of Nac-Tyr (309 +/- 29 mL/kg/min, P > .01). Both dipeptides were hydrolyzed and released tyrosine immediately. In hepatic failure, elimination and hydrolysis of Ala-Tyr and Gly-Tyr were comparable to controls, but Cltot of Nac-Tyr was reduced (236 +/- 26 mL/kg/min). Neither in controls nor in patients an increase in plasma tyrosine concentration was seen after Nac-Tyr, and the major part of Nac-Tyr infused was lost in urine. The Cltot of tyrosine as evaluated after Ala-Tyr infusion (with the immediate release of tyrosine) was severely reduced in hepatic failure (152.7 +/- 38.4 vs. 484.4 +/- 41.4 mL/kg/min, P < .001) and half-life (kle) was retarded from 14.4 +/- 1.4 to 90.2 +/- 32.2 minutes (P < .03). The authors conclude that acute and chronic hepatic dysfunction does not affect elimination and hydrolysis of the dipeptides Ala-Tyr and Gly-Tyr and the constituent amino acids are released immediately. Nac-Tyr elimination was not grossly affected by hepatic failure, but neither in healthy subjects nor in hepatic failure patients was an increase of tyrosine seen. Both dipeptides but not Nac-Tyr may serve as a tyrosine source in parenteral nutrition. Moreover, by its rapid hydrolysis, the use of Ala-Tyr, for the first time, enables a simple rapid nonisotope evaluation of tyrosine kinetics for assessment of liver function." @default.
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• W2006558672 date "1995-04-01" @default.
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• W2006558672 title "Utilization of tyrosine-containing dipeptides and N-acetyl-tyrosine in hepatic failure" @default.
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• W2006558672 doi "https://doi.org/10.1002/hep.1840210406" @default.
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