Document Detail

Relation between pressure natriuresis and urinary excretion of nitrate/nitrite in anesthetized dogs.
MedLine Citation:
PMID:  7536717     Owner:  NLM     Status:  MEDLINE    
Alterations in intrarenal nitric oxide (NO) formation during changes in renal arterial pressure (RAP) have been suggested as a mechanism mediating pressure natriuresis. To test this hypothesis further, we examined the relation between RAP and the urinary excretion rate of nitrate/nitrite (NO3-/NO2-; NO metabolites) in anesthetized sodium-replete dogs before (n = 9) and during (n = 6) intrarenal infusion of the NO synthesis inhibitor nitro-L-arginine (NLA; 50 Urinary NO3-/NO2- concentrations were measured with the Griess reaction and spectrophotometry methods after enzymatic reduction of NO3- to NO2- in the samples. During control conditions, there were decreases in the urinary NO3-/NO2- excretion rate in response to reductions in RAP (150 to 75 mm Hg; slope, 0.04 +/- 0.01 Hg-1) in association with decreases in urinary sodium excretion (UNaV). There was a positive correlation between changes in NO3-/NO2- excretion rate and changes in RAP (r = .48; P < .005) or UNaV (r = .59; P < .001). NLA infusion resulted in decreases in NO3-/NO2- excretion rate (4.8 +/- 1.4 to 1.0 +/- 0.3 nmol.min-1.g-1) in association with reductions in UNaV (4.3 +/- 0.3 to 0.7 +/- 0.2 microL.min-1.g-1), fractional excretion of sodium (2.9 +/- 0.2% to 0.5 +/- 0.1%), and renal blood flow (4.8 +/- 0.3 to 3.3 +/- 0.2 mL.min-1.g-1), without changes in glomerular filtration rate. Furthermore, there was a marked attenuation of the NO3-/NO2- and sodium excretory responses to alterations in RAP during NO synthesis inhibition.(ABSTRACT TRUNCATED AT 250 WORDS)
D S Majid; M Godfrey; M B Grisham; L G Navar
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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:  Hypertension     Volume:  25     ISSN:  0194-911X     ISO Abbreviation:  Hypertension     Publication Date:  1995 Apr 
Date Detail:
Created Date:  1995-05-25     Completed Date:  1995-05-25     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7906255     Medline TA:  Hypertension     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  860-5     Citation Subset:  IM    
Department of Physiology SL39, Tulane University School of Medicine, New Orleans, LA 70112, USA.
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MeSH Terms
Amino Acid Oxidoreductases / antagonists & inhibitors
Arginine / analogs & derivatives,  pharmacology
Blood Pressure*
Nitrates / urine*
Nitric Oxide Synthase
Nitrites / urine*
Renal Artery / physiology*
Grant Support
Reg. No./Substance:
0/Nitrates; 0/Nitrites; 2149-70-4/Nitroarginine; 74-79-3/Arginine; EC Oxide Synthase; EC 1.4.-/Amino Acid Oxidoreductases

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