Document Detail


Maternal nutrient restriction reduces carotid artery constriction without increasing nitric oxide synthesis in the late gestation rat fetus.
MedLine Citation:
PMID:  16183825     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Chronic reduction in substrate delivery to the fetus may induce redistribution of fetal cardiac output to maintain nutrient delivery to vital organs, including the brain. Reduced vasoconstriction, in conjunction with increased local synthesis of nitric oxide may contribute to "brain sparing." The authors hypothesized that maternal undernutrition would reduce vasoconstrictor responses in fetal carotid arteries due to increased nitric oxide. Timed pregnant Sprague-Dawley rats were randomized on day 0 of pregnancy to control (C) or nutrient restricted (NR) diet. Dams were killed on day 20 of pregnancy. Fetal carotid artery responses were assessed using a pressurized myograph system. Fetal body weight was reduced by NR diet. In NR fetuses, liver, lung, kidney, and heart weights were lower, whereas proportional brain weight was greater. Carotid artery constriction to endothelin-1 was similar in both groups; however, phenylephrine-induced constriction was decreased in NR arteries. Arteries from control fetuses constricted in response to increasing concentrations of L-NAME, whereas arteries from NR did not. There was also no effect of L-NAME on constriction to phenylephrine in arteries from NR fetuses. Our study indicates that the reduced carotid artery vasoconstriction to phenylephrine in NR fetuses, which is consistent with the maintenance of fetal brain blood flow, was not mediated by enhanced nitric oxide. Reduced phenylephrine but not endothelin-1-induced constriction suggests specific effects on adrenergic carotid artery function, which may implicate this pathway in the vascular adaptation to fetal undernutrition.
Authors:
Morag E Campbell; Sarah J Williams; Sukrutha Veerareddy; Sandra T Davidge
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-09-23
Journal Detail:
Title:  Pediatric research     Volume:  58     ISSN:  0031-3998     ISO Abbreviation:  Pediatr. Res.     Publication Date:  2005 Nov 
Date Detail:
Created Date:  2005-10-31     Completed Date:  2006-01-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0100714     Medline TA:  Pediatr Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  840-4     Citation Subset:  IM    
Affiliation:
Neonatal Department, Guys and St Thomas' Hospitals, London, UK, SE1 7EH.
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MeSH Terms
Descriptor/Qualifier:
Animals
Caloric Restriction*
Carotid Arteries / drug effects,  physiology*
Enzyme Inhibitors / pharmacology
Female
Maternal Nutritional Physiological Phenomena*
NG-Nitroarginine Methyl Ester / pharmacology
Nitric Oxide / biosynthesis*,  physiology
Organ Size
Phenylephrine / pharmacology
Rats
Rats, Sprague-Dawley
Vasoconstriction*
Vasoconstrictor Agents / pharmacology
Chemical
Reg. No./Substance:
0/Enzyme Inhibitors; 0/Vasoconstrictor Agents; 10102-43-9/Nitric Oxide; 50903-99-6/NG-Nitroarginine Methyl Ester; 59-42-7/Phenylephrine

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