Effect of enteral glutamine or glycine on whole-body nitrogen kinetics in very-low-birth-weight infants.
BACKGROUND
Glutamine is a critical amino acid for the metabolism of enterocytes, lymphocytes, and other proliferating cells. Although supplementation with glutamine has been suggested for growing infants, its effect on protein metabolism has not been examined.


OBJECTIVE
The objective was to examine the effect of enteral glutamine or glycine on whole-body kinetics of glutamine, phenylalanine, leucine, and urea in preterm infants.


METHODS
Infants at <32 wk of gestation were given formula supplemented with either glutamine (0.6 g. kg(-1). d(-1); n = 9) or isonitrogenous amounts of glycine (n = 9) for 5 d. Eight infants fed unsupplemented formula served as control subjects. Glutamine, phenylalanine, leucine nitrogen flux, leucine carbon flux, and urea kinetics were quantified during a basal fasting period and in response to nutrient intake.


RESULTS
Growing preterm infants had a high weight-specific rate of appearance of glutamine, phenylalanine, and leucine nitrogen flux. When compared with the control treatment, enteral glutamine resulted in a high rate of urea synthesis, no change in the plasma glutamine concentration, and no change in the rate of appearance of glutamine. Glycine supplementation resulted in similar changes in nitrogen metabolism, but the magnitude of change was less than that in the glutamine group. In the nonsupplemented infants, the rate of appearance of leucine nitrogen flux was negatively correlated (rho = -0.72) with urea synthesis. In contrast, the correlation (rho = 0.75) was positive in the glutamine group.


CONCLUSIONS
Enterally administered glutamine in growing preterm infants is entirely metabolized in the gut and does not have a discernable effect on whole-body protein and nitrogen kinetics.
Schwartz Center for Metabolism & Nutrition, MetroHealth Medical Center, Cleveland, OH 44109-1998, USA. sck@po.cwru.edu
Prabhu S
PS
Parimi
Srisatish
S
Devapatla
Lourdes L
LL
Gruca
Saeid B
SB
Amini
Richard W
RW
Hanson
Satish C
SC
Kalhan
D001806:Blood Urea Nitrogen; D004750:Enteral Nutrition; D005973:Glutamine / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics; D005998:Glycine / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics; D006801:Humans; D041943:Infant Formula; D007227:Infant Nutritional Physiological Phenomena; D007231:Infant, Newborn; D019102:Infant, Very Low Birth Weight / Q000097:blood / Q000254:growth & development* / Q000378:metabolism; D007930:Leucine / Q000097:blood / Q000493:pharmacokinetics; D009584:Nitrogen / Q000493:pharmacokinetics*; D014508:Urea / Q000493:pharmacokinetics
D005973:Glutamine; D014508:Urea; D007930:Leucine; D009584:Nitrogen; D005998:Glycine