Document Detail


Intravertebral ANG II effects on plasma renin and Na excretion in dogs at constant renal artery pressure.
MedLine Citation:
PMID:  7864169     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Studies were performed to determine whether intravertebral angiotensin II infusion (iva ANG II) decreases renin release by increasing renal perfusion pressure (RPP) and to investigate possible effects of iva ANG II on renal function. RPP was electronically servocontrolled in 12 conscious dogs equipped with chronic vascular catheters and a suprarenal aortic balloon constrictor while iva ANG II was infused bilaterally for 60 min at 0.33 ng.kg-1.min-1. Without servocontrol, iva ANG II increased mean arterial pressure (MAP) from 101 +/- 4 to 106 +/- 5 mmHg, urine flow (V) from 0.36 +/- 0.03 to 0.45 +/- 0.04 ml/min, and sodium excretion (UNaV) from 36.2 +/- 7.0 to 62.7 +/- 6.6 mumol/min. Plasma renin activity (PRA) decreased from 6.9 +/- 0.7 to 5.0 +/- 0.6 ng ANG I.ml-1.3 h-1. With servocontrol, iva ANG II increased MAP from 102 +/- 4 to 109 +/- 5 mmHg while RPP remained constant with a variation of less than +/- 1 mmHg. PRA did not change significantly (5.9 +/- 0.3 to 7.0 +/- 0.7 ng ANG I.ml-1.3 h-1). V decreased from 0.33 +/- 0.02 to 0.26 +/- 0.01 ml/min, and UNaV decreased from 49.0 +/- 5.7 to 29.7 +/- 4.4 mumol/min. The data provide evidence that iva ANG II decreases renin release by increasing RPP and stimulating the renal baroreceptor and/or the macula densa mechanisms. In addition, at constant RPP, ANG II exerts a central action to decrease UNaV.
Authors:
E W Quillen; I A Reid
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  268     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1995 Feb 
Date Detail:
Created Date:  1995-03-20     Completed Date:  1995-03-20     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:  F296-301     Citation Subset:  IM    
Affiliation:
Department of Physiology, University of California at San Francisco 94143.
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MeSH Terms
Descriptor/Qualifier:
Angiotensin II / administration & dosage*,  pharmacology
Animals
Blood Pressure*
Dogs
Injections, Intravenous
Injections, Spinal
Natriuresis / drug effects*
Renal Artery / physiology*
Renin / blood*
Time Factors
Grant Support
ID/Acronym/Agency:
HL-29714/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
11128-99-7/Angiotensin II; EC 3.4.23.15/Renin

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


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