Document Detail


Cardiovascular system of offsprings of hypertensive rats with defective nitric oxide production.
MedLine Citation:
PMID:  12470199     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The question was addressed of how nitric oxide synthase (NO synthase) inhibition-induced hypertension in rat parents would affect the cardiovascular system in their offsprings. Two experimental groups were set up: Group I -- offsprings of parents who had both been administered NO synthase inhibitor L-nitro-arginine methyl ester (L-NAME 40 mg/kg/day) for 5 weeks, the treatment of dams continued till week 12. Group II -- offsprings fed by dams administered L-NAME after delivery only for a period of 4 weeks. Control age-matched offsprings formed the third group. Blood pressure and heart rate in parents and in 3-week-old offsprings were determined noninvasively. In the offsprings, body and heart weight were measured and the heart/body weight ratio (HW/BW) was calculated. The NO synthase activity, and also ornithine decarboxylase activity as a marker of polyamine production, were determined in the heart. The acetylcholine-induced relaxation of aortic rings was also followed. A marked blood pressure increase with a tendency to a decreased heart rate was found in the offsprings of Group I. A significant decrease in heart weight and body weight with a decreased HW/BW ratio indicated cardiac hypotrophy that contrasted with the decrease in NO synthase activity and increase in ornithine decarboxylase activity in the heart. Noteworthy was also the finding of completely preserved relaxation of the aorta to acetylcholine. Offsprings of Group II were similarly characterized by significantly higher blood pressure, a tendency to decreased heart rate, a decrease in heart weight, but not of the HW/BW ratio. The contrasting findings of heart weight decrease on the one hand and NO synthase activity decrease and ornithine decarboxylase increase on the other, were also found in this group. Full relaxation of the aorta to acetylcholine was preserved. It can be concluded that remarkable alterations in the cardiovascular system were found in offsprings of hypertensive NO compromised parents.
Authors:
M Gerová; I Bernátová; J Török; M Juráni
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Physiological research / Academia Scientiarum Bohemoslovaca     Volume:  51     ISSN:  0862-8408     ISO Abbreviation:  Physiol Res     Publication Date:  2002  
Date Detail:
Created Date:  2002-12-09     Completed Date:  2003-05-02     Revised Date:  2008-04-02    
Medline Journal Info:
Nlm Unique ID:  9112413     Medline TA:  Physiol Res     Country:  Czech Republic    
Other Details:
Languages:  eng     Pagination:  465-74     Citation Subset:  IM    
Affiliation:
Institute of Normal and Pathological Physiology, Slovak Academy of Sciences, Bratislava, Slovak Republic. gerova@unpf.savba.sk
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MeSH Terms
Descriptor/Qualifier:
Acetylcholine / pharmacology
Animals
Aorta / drug effects,  embryology,  enzymology*
Blood Pressure / drug effects
Enzyme Inhibitors / pharmacology
Female
Heart / embryology*
Heart Rate / drug effects
Hypertension / metabolism*
Male
Myocardium / enzymology*
NG-Nitroarginine Methyl Ester / pharmacology
Nitric Oxide / biosynthesis*,  metabolism
Nitric Oxide Synthase / antagonists & inhibitors,  metabolism
Ornithine Decarboxylase / metabolism
Pregnancy
Prenatal Exposure Delayed Effects
Rats
Rats, Inbred WKY
Vasodilator Agents / pharmacology
Chemical
Reg. No./Substance:
0/Enzyme Inhibitors; 0/Vasodilator Agents; 10102-43-9/Nitric Oxide; 50903-99-6/NG-Nitroarginine Methyl Ester; 51-84-3/Acetylcholine; EC 1.14.13.39/Nitric Oxide Synthase; EC 4.1.1.17/Ornithine Decarboxylase

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


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