Linked Life Data

6252786

Source:http://linkedlifedata.com/resource/pubmed/id/6252786

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1980-12-18
pubmed:abstractText
Chronic K loading and Na deficiency increase the capacity of colonic cells to secrete K and are characterized by increases in Na-K-ATPase activity and, as recently shown by our laboratory, the area of basolateral membrane. The present experiments were performed in rat colon to evaluate the quantitative and qualitative changes that occur in the enzymes after induction of K adaptation. Changes in specific binding of [3H]ouabain to a plasma membrane-rich fraction of colonic mucosal cells correlated directly with changes in enzyme activity. In Na-deficient animals the number of ouabain-binding sites increased from 63.6 in controls to 111.2 pmol/mg protein, while the KD for ouabain was unchanged. The Km for ATP was not altered in experimental animals, although Vmax rose twofold. Further studies showed no change in the activity of adenylate cyclase, a marker enzyme for basolateral membrane, in the plasma membrane-rich fraction from experimental cells, although Na-K-ATPase activity increased significantly. These data indicate that increased Na-K-ATPase activity in K-adapted colonic cells reflects an absolute increase in number of pump sites, due, at least in part, to an increase in area of basolateral cell membrane. In addition, in sodium-deprived animals the present data suggest an increase in the density of K pumps in basolateral cell membrane.
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
239
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
F378-F382
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1980
pubmed:articleTitle
Mechanism of increased potassium secretion in potassium loading and sodium deprivation.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.