Document Detail


Effects of intrauterine growth restriction and intraamniotic insulin-like growth factor-I treatment on blood and amniotic fluid concentrations and on fetal gut uptake of amino acids in late-gestation ovine fetuses.
MedLine Citation:
PMID:  12352515     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: To investigate, in the late-gestation ovine fetus: 1) amino acid concentrations in blood and amniotic fluid, 2) the effects of intrauterine growth restriction (IUGR) induced by placental embolization on these concentrations, 3) fetal gut uptake of glutamine in healthy and IUGR fetuses, and 4) the effects of intraamniotic insulin-like growth factor-I (IGF-1) treatment on these parameters. METHODS: Fetuses were randomly assigned to control (n = 9), IUGR + saline (n = 9), or IUGR + IGF-1 (n = 11) groups. IUGR was induced by uteroplacental embolization from 114 to 119 days (term = 145 days). IUGR fetuses received daily intraamniotic injections of saline or IGF-1 (20 microg/d) from 120 to 130 days. RESULTS: Baseline amino acid concentration was higher in fetal blood than amniotic fluid for all essential amino acids except lysine and histidine, but was lower for serine, alanine, and methylhistidine. Embolization reduced total amino acid concentration in blood and amniotic fluid by approximately 15%. Concentrations were reduced for serine, glutamine, and methylhistidine in blood and for serine in amniotic fluid, but were increased for glycine, alanine, and asparagine in blood and for alanine in amniotic fluid. Glutamine was taken up by the fetal gut (glutamine:oxygen quotient of 0.65) and citrulline was released by the gut. IGF-1 treatment did not alter amino acid concentration in blood or amniotic fluid, but reduced gut uptake of glutamine from blood and the gut glutamine:oxygen quotient by 15%. Citrulline release was unchanged. CONCLUSIONS: These data suggest that amniotic fluid amino acids are not simply filtered from fetal blood and may provide an important pool of nutrients for the fetus. They demonstrate for the first time that glutamine is taken up by the fetal gut. IGF-1 treatment may promote gut utilization of amino acids from the amniotic fluid pool.
Authors:
Frank H Bloomfield; Pierre L van Zijl; Michael K Bauer; Jane E Harding
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of pediatric gastroenterology and nutrition     Volume:  35     ISSN:  0277-2116     ISO Abbreviation:  J. Pediatr. Gastroenterol. Nutr.     Publication Date:  2002 Sep 
Date Detail:
Created Date:  2002-09-27     Completed Date:  2003-01-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8211545     Medline TA:  J Pediatr Gastroenterol Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  287-97     Citation Subset:  IM    
Affiliation:
Liggins Institute, University of Auckland, PB 92019, Auckland, New Zealand.
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MeSH Terms
Descriptor/Qualifier:
Amino Acids / blood*,  drug effects*
Amnion / drug effects*
Amniotic Fluid / drug effects*,  metabolism*
Animals
Catheterization
Embolism / blood,  metabolism
Female
Fetal Growth Retardation / blood*
Fetus / drug effects*,  metabolism*
Gestational Age*
Glutamine / blood*,  drug effects*
Insulin-Like Growth Factor I / administration & dosage*
Intestines / drug effects*,  metabolism*
Pregnancy
Sheep
Chemical
Reg. No./Substance:
0/Amino Acids; 56-85-9/Glutamine; 67763-96-6/Insulin-Like Growth Factor I

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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