Document Detail


Maintenance of renal autoregulation during infusion of aminophylline or adenosine.
MedLine Citation:
PMID:  2983569     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Adenosine has been postulated to link control of glomerular filtration rate (GFR) and renal blood flow (RBF) with changes in renal metabolism. In the present study, we examined the role of adenosine in renal autoregulation by comparing the responses of normal anesthetized dogs to step decreases in renal artery pressure (RAP) to the response obtained after receptor blockade of adenosine with aminophylline or by flooding the kidney with exogenous adenosine. In six dogs at normal RAP, intrarenal infusion of aminophylline (10 mumol/min) did not alter renal hemodynamics. GFR and RBF were well autoregulated (greater than 90% of control) at RAP values equal to or greater than 85 mmHg before and after aminophylline. At RAP equal to 75 mmHg, GFR and RBF decreased by 27 +/- 10 and 20 +/- 8%, respectively, before aminophylline and by 25 +/- 7 and 13 +/- 6% after aminophylline. In a different group of six dogs, intrarenal infusion of adenosine (6 mumol/min) significantly increased RBF (32 +/- 9%) and decreased GFR (38 +/- 10%) at normal RAP. However, GFR and RBF were both well autoregulated (greater than 90% of control) at RAP values equal to or greater than 85 mmHg before and after adenosine. At RAP equal to 75 mmHg, GFR and RBF decreased by 10 +/- 5 and 7 +/- 3%, respectively, before adenosine and by 12 +/- 6 and 17 +/- 5% after adenosine. Neither aminophylline nor adenosine attenuated the elevations in plasma renin activity associated with reductions in RAP. These data fail to provide evidence that adenosine is an important factor in autoregulation of GFR and RBF during acute reductions in RAP within the autoregulatory range.
Authors:
A J Premen; J E Hall; H L Mizelle; J E Cornell
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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:  248     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1985 Mar 
Date Detail:
Created Date:  1985-04-10     Completed Date:  1985-04-10     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:  F366-73     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adenosine / pharmacology*,  physiology
Aminophylline / pharmacology*
Animals
Blood Pressure
Dogs
Glomerular Filtration Rate / drug effects
Homeostasis / drug effects
Kidney / drug effects*,  physiology
Receptors, Cell Surface / drug effects
Receptors, Purinergic
Renal Artery / physiology
Renal Circulation / drug effects
Renin-Angiotensin System / drug effects
Grant Support
ID/Acronym/Agency:
F32-AM-07109/AM/NIADDK NIH HHS; HL-11678/HL/NHLBI NIH HHS; HL-23502/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Receptors, Cell Surface; 0/Receptors, Purinergic; 317-34-0/Aminophylline; 58-61-7/Adenosine

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


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