Document Detail

Plasma and 24-h NO(x) and cGMP during normal pregnancy and preeclampsia in women on a reduced NO(x) diet.
MedLine Citation:
PMID:  10409297     Owner:  NLM     Status:  MEDLINE    
We tested the hypothesis that nitric oxide (NO) biosynthesis increases during normal human pregnancy and decreases in preeclampsia. The major metabolites of NO, nitrate and nitrite (NO(x)), were measured in both the plasma and 24-h urine of women subjected to a reduced NO(x) diet. In this way, the plasma and urinary levels mainly reflected endogenous production rather than dietary intake. Moreover, we assessed cGMP, a second messenger of NO, in the same samples. Both NO(x) and cGMP assays were validated in our laboratory. We first conducted a cross-sectional study of nonpregnant women (n = 15), normal pregnant women in the first (n = 9), second (n = 17) and third (n = 22) trimesters, as well as women with preeclampsia (n = 15) and transient hypertension of pregnancy (n = 7). We also performed a serial study in the same women (n = 9) before, during, and after pregnancy. Taken together, the results of the two investigations suggested marked increases in cGMP production especially during the first trimester when the maternal circulation is rapidly vasodilating. In contrast, whole body NO production as estimated by the plasma level and urinary excretion of NO(x) was not elevated during the first trimester. Finally, unequivocal demonstration of reduced NO biosynthesis in preeclampsia was not forthcoming.
K P Conrad; L J Kerchner; M D Mosher
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  277     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1999 Jul 
Date Detail:
Created Date:  1999-08-30     Completed Date:  1999-08-30     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  F48-57     Citation Subset:  IM    
Departments of Obstetrics, Gynecology and Reproductive Sciences, and of Cell Biology and Physiology, University of Pittsburgh, Magee-Womens Research Institute, Pittsburgh, Pennsylvania 15213, USA.
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MeSH Terms
Cross-Sectional Studies
Cyclic GMP / metabolism*
Longitudinal Studies
Nitric Oxide / metabolism*
Pre-Eclampsia / metabolism*
Time Factors
Grant Support
Reg. No./Substance:
10102-43-9/Nitric Oxide; 7665-99-8/Cyclic GMP

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