Linked Life Data

9555654

Source:http://linkedlifedata.com/resource/pubmed/id/9555654

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1998-6-11
pubmed:abstractText
Acute systolic arterial hypertension provokes a rapid decrease in proximal tubule sodium reabsorption and diuresis associated with inhibition of renal cortex Na,K-ATPase activity and redistribution of apical membrane Na/H exchanger (NHE-3) to heavier density membranes containing markers of intermicrovillar cleft and endosomes. Because cytochrome P-450-dependent arachidonate metabolites participate in the regulation of renal sodium transport and BP, this study tested the hypothesis that these renal responses to acute hypertension would be prevented if cytochrome P-450 metabolism were inhibited by cobalt chloride (CoCl2). Four groups of rats (n = 4 to 5) were studied: (1) sham-operated; (2) 50 mg of CoCl2/kg subcutaneously for 2 d; (3) acute hypertension by constricting arteries for 5 min; and (4) acute hypertension after CoCl2 treatment as in group 3. Renal cortex was analyzed after sorbitol density gradient fractionation. CoCl2 treatment alone did not significantly affect the rate of urine output, endogenous lithium clearance (an inverse measure of proximal tubule sodium reabsorption), maximal activity of Na,K-ATPase, or subcellular distribution of NHE-3-containing membranes. In non-CoCl2-treated animals, acute hypertension provoked a three- to fourfold increase in urine output and endogenous lithium clearance, 33% inhibition of renal cortex Na,K-ATPase activity, and redistribution of NHE-3 out of the apical membrane peak. In CoCl2-treated animals, acute urine output and endogenous lithium clearance increased only twofold during acute hypertension, there was no inhibition of Na,K-ATPase activity, and there was no redistribution of NHE-3 immunoreactivity to higher density membranes. These findings demonstrate that CoCl2 treatment both attenuates the inhibition of proximal tubule sodium reabsorption and diuresis and abolishes Na,K-ATPase inhibition and NHE-3 redistribution during acute hypertension, evidence that these responses may be mediated by cytochrome P-450 arachidonate metabolites.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1046-6673
pubmed:author
pubmed:issnType
Print
pubmed:volume
9
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
531-7
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed-meshheading:9555654-Acute Disease, pubmed-meshheading:9555654-Analysis of Variance, pubmed-meshheading:9555654-Animals, pubmed-meshheading:9555654-Cobalt, pubmed-meshheading:9555654-Culture Techniques, pubmed-meshheading:9555654-Cytochrome P-450 Enzyme System, pubmed-meshheading:9555654-Disease Models, Animal, pubmed-meshheading:9555654-Hypertension, pubmed-meshheading:9555654-Immunoblotting, pubmed-meshheading:9555654-Kidney Cortex, pubmed-meshheading:9555654-Lithium, pubmed-meshheading:9555654-Male, pubmed-meshheading:9555654-Rats, pubmed-meshheading:9555654-Rats, Sprague-Dawley, pubmed-meshheading:9555654-Reference Values, pubmed-meshheading:9555654-Renal Circulation, pubmed-meshheading:9555654-Sodium-Hydrogen Antiporter, pubmed-meshheading:9555654-Sodium-Potassium-Exchanging ATPase, pubmed-meshheading:9555654-Urine
pubmed:year
1998
pubmed:articleTitle
The cytochrome P-450 inhibitor cobalt chloride prevents inhibition of renal Na,K-ATPase and redistribution of apical NHE-3 during acute hypertension.
pubmed:affiliation
Department of Physiology and Biophysics, University of Southern California School of Medicine, Los Angeles 90033, USA.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't