Document Detail


Interactions between nitric oxide and renal nerves on pressure-diuresis and natriuresis.
MedLine Citation:
PMID:  9727366     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The present study examined the effect of renal denervation on the impairment of the pressure-diuresis response produced by nitric oxide synthesis blockade. The experiments were performed in Inactin-anesthetized Munich-Wistar rats. The animals with innervated kidneys had lower baseline values of renal blood flow, GFR, sodium excretion (UNaV), and urine flow (V) than rats with denervated kidneys. Also, renal denervation shifted pressure-diuresis and natriuresis toward lower pressures. A low dose of N(omega)-nitro-L-arginine methyl esther (NAME, 3.7 nmol/kg per min) reduced UNaV and the fractional excretion of sodium (FENa) and blunted pressure-natriuresis only in rats with innervated kidneys, whereas it had no effects in rats with denervated kidneys. A medium dose of NAME (37 nmol/kg per min) lowered FENa only in rats with innervated kidneys. The administration of NAME (37 nmol/kg per min) blunted pressure-diuresis and natriuresis in kidneys with or without the renal nerves, but the effect was more pronounced in rats with innervated kidneys. A high dose of NAME (3.7 micromol + 185 nmol/kg per min) increased UNaV and FENa only in rats with innervated kidneys, whereas it reduced GFR, V, UnaV, and FENa in rats with denervated kidneys. However, pressure-natriuresis and diuresis were blunted by this high dose of NAME independently of the presence or absence of renal nerves. These results demonstrate that renal nerves potentiate the renal effects of low doses of NAME on renal function and pressure-diuresis and natriuresis. However, high doses of NAME abolish pressure-diuresis independently of renal nerves, and the natriuretic effect of NAME in innervated kidneys may be attributed to reflex inhibition of sympathetic tone due to the rise in arterial pressure.
Authors:
M I Madrid; M G Salom; J Tornel; E López; F J Fenoy
Related Documents :
3718646 - Epidemiology and management of severe symptomatic neonatal hypertension.
3929256 - Canine renal vascular response to bilateral carotid occlusion during hypoxia.
12902616 - Renal and cardiovascular responses to water immersion in essential hypertension: is the...
2537556 - Central and renal hemodynamic effects of a new agonist at peripheral dopamine- and beta...
10607176 - Pulmonary haemodynamics in obstructive sleep apnoea.
8310976 - Measurement of long-term hemodynamic changes and the use of 24-hour blood pressure moni...
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the American Society of Nephrology : JASN     Volume:  9     ISSN:  1046-6673     ISO Abbreviation:  J. Am. Soc. Nephrol.     Publication Date:  1998 Sep 
Date Detail:
Created Date:  1998-12-09     Completed Date:  1998-12-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9013836     Medline TA:  J Am Soc Nephrol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1588-95     Citation Subset:  IM    
Affiliation:
Departamento de Fisiología y Farmacología, Facultad de Medicina, Universidad de Murcia, Spain.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Animals
Denervation
Disease Models, Animal
Diuresis / drug effects,  physiology*
Dose-Response Relationship, Drug
Enzyme Inhibitors / pharmacology
Female
Kidney / blood supply*,  innervation*
Kidney Function Tests
Male
NG-Nitroarginine Methyl Ester / pharmacology
Natriuresis / drug effects,  physiology*
Nitric Oxide / analysis,  metabolism*
Rats
Rats, Wistar
Reference Values
Regional Blood Flow
Chemical
Reg. No./Substance:
0/Enzyme Inhibitors; 10102-43-9/Nitric Oxide; 50903-99-6/NG-Nitroarginine Methyl Ester

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


Previous Document:  Evidence against elevated sympathetic vasoconstrictor activity in borderline hypertension.
Next Document:  Nitric oxide release as an essential mitigating step in tubuloglomerular feedback: observations duri...