Linked Life Data

7541779

Source:http://linkedlifedata.com/resource/pubmed/id/7541779

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1995-8-14
pubmed:abstractText
Chronic nitric oxide inhibition promotes hypertension, renal dysfunction, and renal injury by unclear mechanisms. We examined the effects in this model of concomitant treatment with the calcium channel blocker nifedipine. Six adult male Munich-Wistar rats received 0.025% nifedipine in chow. Six untreated rats served as controls. Fifteen days later, renal function was evaluated in anesthetized rats before and after a bolus injection of the nitric oxide inhibitor N omega-nitro-L-arginine methyl ester at 3 mg/kg IV. Renal vasoconstriction and systemic hypertension induced by the inhibitor were similar in untreated and nifedipine-treated rats. In a second protocol, eight rats received the nitric oxide inhibitor in their drinking water at 2.6 mmol/L. Eight additional rats also received nifedipine as above. At day 15, rats given the nitric oxide inhibitor exhibited systemic hypertension and renal vasoconstriction. Simultaneous nifedipine lowered blood pressure slightly without ameliorating renal hemodynamics. Tail-cuff pressure rose continuously in rats receiving the nitric oxide blocker, reaching 171 +/- 7 mm Hg at 30 days, but remained at 143 +/- 3 mm Hg in rats also given nifedipine. At this stage, rats treated with the nitric oxide inhibitor exhibited extremely variable plasma renin activity, tuft collapse in 10.1 +/- 2.2% of the glomeruli, and renal interstitial fibrosis. Simultaneous nifedipine treatment normalized the dispersion of plasma renin levels, while preventing renal morphological abnormalities. These results suggest that in the chronic nitric oxide inhibition model, sustained operation of voltage-sensitive calcium channels is not essential for renal vasoconstriction but contributes to systemic hypertension and plays a pivotal role in the development of renal structural injury.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0194-911X
pubmed:author
pubmed:issnType
Print
pubmed:volume
26
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
150-5
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed-meshheading:7541779-15-Hydroxy-11 alpha,9..., pubmed-meshheading:7541779-3-Pyridinecarboxylic acid..., pubmed-meshheading:7541779-Animals, pubmed-meshheading:7541779-Arginine, pubmed-meshheading:7541779-Blood Pressure, pubmed-meshheading:7541779-Calcium Channel Blockers, pubmed-meshheading:7541779-Hemodynamics, pubmed-meshheading:7541779-Hypertension, pubmed-meshheading:7541779-Kidney, pubmed-meshheading:7541779-Kidney Glomerulus, pubmed-meshheading:7541779-Male, pubmed-meshheading:7541779-NG-Nitroarginine Methyl Ester, pubmed-meshheading:7541779-Nephritis, Interstitial, pubmed-meshheading:7541779-Nifedipine, pubmed-meshheading:7541779-Nitric Oxide, pubmed-meshheading:7541779-Norepinephrine, pubmed-meshheading:7541779-Prostaglandin Endoperoxides, Synthetic, pubmed-meshheading:7541779-Rats, pubmed-meshheading:7541779-Rats, Wistar, pubmed-meshheading:7541779-Thromboxane A2, pubmed-meshheading:7541779-Time Factors, pubmed-meshheading:7541779-Vasoconstrictor Agents
pubmed:year
1995
pubmed:articleTitle
Nifedipine prevents renal injury in rats with chronic nitric oxide inhibition.
pubmed:affiliation
Department of Clinical Medicine, University of São Paulo (Brazil) School of Medicine.
pubmed:publicationType
Journal Article, Comparative Study, In Vitro, Research Support, Non-U.S. Gov't