Linked Life Data

10818081

Source:http://linkedlifedata.com/resource/pubmed/id/10818081

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2000-6-21
pubmed:abstractText
The aim of this study was to test the hypothesis that differences exist in the activity and/or expression of mitogen-activated protein kinases (MAPKs) between spontaneously hypertensive rats (SHR) and control Wistar-Kyoto rats (WKY) and that these differences may account for the enhanced activity of the Na(+)/H(+) exchanger (NHE) previously observed in the renal proximal tubule of SHR. Therefore, the activities of c-jun N-terminal kinase(1) (JNK(1)), extracellular signal-regulated kinase(1/2) (ERK(1/2)), and p38 were investigated. A reduced amount of ERK(1) and JNK(1) protein was found in renal cortex specimens of SHR as compared with WKY; however, their activities were the same. To study the cellular basis of this difference, immortalized proximal tubule cell lines were grown on Millicell-CM filter inserts where the cell lines organize as polarized monolayers with separate access to apical and basolateral compartments. Although basal JNK(1) and ERK(1/2) activities were not significantly different between WKY and SHR cells, anisomycin stimulated JNK(1) activity in WKY cells more than in SHR cells (eg, at 15 minutes 300% versus 30%, respectively). Similarly, angiotensin II increased JNK(1) and ERK(1/2) activity in a time- and concentration-dependent manner in WKY cells but not in SHR cells. Western blot analyses showed a deficit in JNK(1) and ERK(1) protein in SHR (0.25 and 0.5, respectively, of the levels in WKY cells), although ERK(2) and p38 protein levels were the same. These observations suggest that, although angiotensin II activates MAPKs and MAPKs have been shown to regulate NHE, this regulatory pathway is unlikely to account for the increased activity of NHE in the proximal tubular epithelium of SHR.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
1524-4563
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
35
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1160-6
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Activation of MAPKs in proximal tubule cells from spontaneously hypertensive and control Wistar-Kyoto rats.
pubmed:affiliation
Division of Hypertension, Department of Medicine, School of Medicine, Case Western Reserve University and University Hospitals, Cleveland, Ohio 44106-4982, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't