Document Detail


Oxygen-tension-dependent pulmonary vascular responses to vasoactive agents.
MedLine Citation:
PMID:  871957     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
There have been recent indications that oxygen may nonspecifically oppose pulmonary vasoconstriction induced by a few vasoactive agents. Therefore, we examined the effect of four inspired oxygen tensions on the pulmonary vascular responses to exogenous prostaglandin F2alpha (PGF2alpha), serotonin (5-HT), 2-methylhistamine (2-MeH)(an H1-receptor agonist), histamine (after H2-receptor blockade with metiamide), and prostaglandin E1 (PGE1) in anesthetized dogs. An oxygen tension dependency on the pulmonary vascular responses to these vasoactive agents was observed, with each agent exhibiting maximal responses at different ranges of oxygen tension. PGF2alpha and PGE1 were most effective during hypoxia, while 5-HT, histamine, and 2-MeH produced maximal responses during normoxia. A comparison of dose-response curves for PGF2alpha during breathing of two inspired oxygen tensions indicated a decreased sensitivity, but not decreased reactivity, with the higher oxygen tension. The action of variable oxygen tensions on pulmonary vascular responsiveness to vasoactive agents suggests another role for oxygen in the control of the pulmonary circulation. It is not clear if oxygen acts non-specifically on the vascular smooth muscle, or if it alters the metabolic mechanisms of vasoactive agent action.
Authors:
A Tucker; E K Weir; R F Grover; J T Reeves
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Canadian journal of physiology and pharmacology     Volume:  55     ISSN:  0008-4212     ISO Abbreviation:  Can. J. Physiol. Pharmacol.     Publication Date:  1977 Apr 
Date Detail:
Created Date:  1977-08-12     Completed Date:  1977-08-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372712     Medline TA:  Can J Physiol Pharmacol     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  251-7     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure / drug effects
Carbon Dioxide / blood
Dogs
Drug Interactions
Histamine / pharmacology
Methylhistamines / pharmacology
Oxygen / blood,  pharmacology*
Prostaglandins E / pharmacology
Prostaglandins F / pharmacology
Pulmonary Artery / drug effects*
Serotonin / pharmacology
Vascular Resistance / drug effects
Chemical
Reg. No./Substance:
0/Methylhistamines; 0/Prostaglandins E; 0/Prostaglandins F; 124-38-9/Carbon Dioxide; 50-67-9/Serotonin; 51-45-6/Histamine; 7782-44-7/Oxygen

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


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