Document Detail


Integrated control of pulmonary vascular tone by endothelin and angiotensin II in exercising swine depends on gender.
MedLine Citation:
PMID:  20348226     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The lungs are now recognized as an active metabolic organ that is a major determinant of the plasma concentrations of the vasoconstrictors endothelin (ET) and ANG II. Several studies have suggested a complex interaction between ET and ANG II in the systemic and coronary vascular beds that is different at rest and during exercise. To date, the interaction between these vasoconstrictor peptides has barely been investigated in relation to the pulmonary vascular bed. Consequently, we investigated the integrated control of pulmonary vasomotor tone by ET and ANG II in 24 chronically instrumented swine (15 female and 9 male) at rest and during graded treadmill exercise. In the systemic circulation, ANG II type 1 (AT(1)) receptor blockade with irbesartan and mixed ET(A)/ET(B) blockade with tezosentan each produced vasodilation. The systemic vasodilator effect of ET(A)/ET(B) blockade was enhanced after AT(1) blockade in female swine, whereas a trend toward an increase was observed in male swine. In the pulmonary circulation, AT(1) receptor blockade had no effect on pulmonary vascular tone in male swine, whereas it resulted in an unexpected increase in pulmonary vasomotor tone in female swine. ET(A)/ET(B) receptor blockade did not result in a decrease in pulmonary vasomotor tone at rest but produced a decrease in vasomotor tone during exercise in both genders. This pulmonary vasodilation by ET(A)/ET(B) receptor blockade was enhanced after prior AT(1) blockade in female swine but not in male swine. In conclusion, in both the systemic and pulmonary circulation of female swine, ANG II inhibits the vasoconstrictor influence of ET. This interaction is gender specific. The observation that plasma ET levels were not altered by AT(1) blockade in either gender suggests that the interaction between these vasoconstrictors occurs locally in the vasculature.
Authors:
Vincent J de Beer; Henri J D de Graaff; Maaike Hoekstra; Dirk J Duncker; Daphne Merkus
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-26
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  298     ISSN:  1522-1539     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-20     Completed Date:  2010-06-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H1976-85     Citation Subset:  IM    
Affiliation:
Division of Experimental Cardiology, Department of Cardiology, Thoraxcenter, Cardiovascular Research School COEUR, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Angiotensin II / physiology*
Angiotensin II Type 1 Receptor Blockers / pharmacology
Animals
Biphenyl Compounds / pharmacology
Endothelins / physiology*
Female
Male
Models, Animal
Physical Conditioning, Animal / physiology*
Pulmonary Artery / physiology*
Pyridines / pharmacology
Receptor, Angiotensin, Type 1 / drug effects,  physiology
Receptors, Endothelin / antagonists & inhibitors,  drug effects,  physiology
Sex Characteristics*
Swine
Tetrazoles / pharmacology
Vasoconstriction / physiology
Vasodilator Agents / pharmacology
Chemical
Reg. No./Substance:
0/Angiotensin II Type 1 Receptor Blockers; 0/Biphenyl Compounds; 0/Endothelins; 0/Pyridines; 0/Receptor, Angiotensin, Type 1; 0/Receptors, Endothelin; 0/Tetrazoles; 0/Vasodilator Agents; 0/tezosentan; 11128-99-7/Angiotensin II; 138402-11-6/irbesartan

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


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