Document Detail

Arginine flux, but not nitric oxide synthesis, decreases in adolescent girls compared with adult women during pregnancy.
MedLine Citation:
PMID:  21084652     Owner:  NLM     Status:  MEDLINE    
NO has been proposed as a mediator of vascular expansion during pregnancy. Inability to increase NO synthesis and/or production of its precursor, arginine, may contribute to pregnancy-induced hypertension. Adolescents have a higher incidence of gestational hypertension. It is not known whether pregnant adolescents can produce sufficient arginine to meet overall demands. Our objective was to measure and compare the arginine flux and NO synthesis rates of pregnant adolescents and adult women. Arginine, citrulline, and NO kinetics were measured by i.v. infusions of (15)N(2)-argininine and (2)H(2)-citrulline in 8 adolescents and 8 adult women in the fasted state at the end of the first and the beginning of the 3rd trimesters of pregnancy. Arginine flux decreased (P < 0.05) from trimester 1 to 3 in the adolescents but not in the adult women. NO synthesis rate did not change significantly in either group from trimester 1 to 3. In trimester 3, there was a positive association (r = 0.55; P = 0.02) between arginine flux and participants' age, indicating that flux was slower in the younger participants. These findings suggest that after a brief period of food deprivation, the pregnant adolescent cannot maintain arginine production like her adult counterpart in late pregnancy. This inability to maintain arginine production seems to be related to her younger age. It does not, however, affect her ability to synthesize NO in late pregnancy.
Minerva M Thame; Horace M Fletcher; Tameka M Baker; Juan C Marini; Christina C Kao; Farook Jahoor
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-11-17
Journal Detail:
Title:  The Journal of nutrition     Volume:  141     ISSN:  1541-6100     ISO Abbreviation:  J. Nutr.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-21     Completed Date:  2011-01-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  71-4     Citation Subset:  IM    
Department of Obstetrics, Gynaecology and Child Health, University of the West Indies, Mona, Kingston, Jamaica.
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MeSH Terms
Arginine / metabolism*
Nitric Oxide / biosynthesis*
Pregnancy / metabolism*
Reg. No./Substance:
10102-43-9/Nitric Oxide; 74-79-3/Arginine

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