Linked Life Data

7943283

Source:http://linkedlifedata.com/resource/pubmed/id/7943283

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4 Pt 1
pubmed:dateCreated
1994-11-22
pubmed:abstractText
The activity of Na(+)-K(+)-adenosinetriphosphatase (Na(+)-K(+)-ATPase), the sodium pump, which drives active Na+ reabsorption along the nephron, varies over an order of magnitude, depending on the nephron segment, and activity is increased in the outer medullary collecting tubule (MCT) during hypokalemia. The aims of the present study were to assess abundance of sodium pump alpha 1- and beta 1-subunits in dissected nephron segments of the rat by immunoblotting, to determine if alpha 2- or alpha 3-protein could be detected in the collecting tubules, as suggested by Barlet-Bas et al. (C. Barlet-Bas, E. Arystarkhova, L. Cheval, S. Marsy, K. Sweadner, N. Modyanov, and A. Doucet. J. Biol. Chem. 268: 11512-11515, 1993) for rabbit, and to determine if alpha 1 and beta 1 were increased in MCT by hypokalemia. Tubules from the rat were resolved by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (12-100 mm/lane), blotted, and probed with subunit-specific antisera. alpha 1 and beta 1, detected in all tubule segments assayed, were highest in cortical and medullary thick ascending limbs and proximal convoluted tubule (PCT), lower in the MCT and barely detectable in proximal straight tubule. In the cortical collecting tubule (CCT), alpha 1 abundance was equivalent to that in PCT, whereas beta 1 and enzymatic activity were both less than one-half of that in PCT. After 2 wk of a K(+)-deficient diet, alpha 1- and beta 1-subunit levels in MCT increased 3.4 +/- 0.6- and 11.7 +/- 4.0-fold, respectively, associated with a 5-fold increase in activity. alpha 2 and alpha 3 were not detected in the CCT or MCT.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0002-9513
pubmed:author
pubmed:issnType
Print
pubmed:volume
267
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
C901-8
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Expression of Na(+)-K(+)-ATPase alpha- and beta-subunits along rat nephron: isoform specificity and response to hypokalemia.
pubmed:affiliation
Department of Physiology and Biophysics, University of Southern California School of Medicine, Los Angeles 90033.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.