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Citations to this article

Proteolysis and phenylalanine hydroxylation in response to parenteral nutrition in extremely premature and normal newborns.
S C Denne, … , J Wang, E A Liechty
S C Denne, … , J Wang, E A Liechty
Published February 1, 1996
Citation Information: J Clin Invest. 1996;97(3):746-754. https://doi.org/10.1172/JCI118473.
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Research Article Article has an altmetric score of 9

Proteolysis and phenylalanine hydroxylation in response to parenteral nutrition in extremely premature and normal newborns.

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Abstract

To determine to what extent intravenous nutrition can reduce proteolysis in very immature and normal newborns, and to assess the capacity of preterm and normal newborns to convert phenylalanine to tyrosine, phenylalanine and leucine kinetics were measured under basal conditions and during parenteral nutrition in clinically stable, extremely premature (approximately 26 wk of gestation) infants and in normal term newborns. In response to parenteral nutrition, there was significantly less suppression (P < 0.001) of endogenous leucine and phenylalanine rate of appearance in extremely premature infants compared with term infants. Phenylalanine utilization for protein synthesis during parenteral nutrition increased significantly (P < 0.01) and by the same magnitude (approximately 15%) in both extremely premature and term infants. Phenylalanine was converted to tyrosine at substantial rates in both extremely premature and term infants; however, this conversion rate was significantly higher (P < 0.05) in extremely premature infants during both the basal and parenteral nutrition periods. These data provide clear evidence that there is no immaturity in the phenylalanine hydroxylation pathway. Furthermore, although parenteral nutrition appears to produce similar increases in protein synthesis in extremely premature and term infants, proteolysis is suppressed much less in extremely premature newborns. The factors responsible for this apparent resistance to suppression of proteolysis in the very immature newborn remain to be elucidated.

Authors

S C Denne, C A Karn, J A Ahlrichs, A R Dorotheo, J Wang, E A Liechty

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Year: 2020 2019 2018 2016 2015 2014 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1981 Total
Citations: 3 1 3 2 2 2 3 5 3 1 7 7 6 6 5 7 3 2 3 2 6 2 1 82
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