Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1987-8-31
pubmed:abstractText
Isolated rat enterocytes were permeabilized by saponin treatment. 45Ca2+ was accumulated by these cells when provided with ATP in a medium containing Ca2+ ligands. The use of oxalate, vanadate and mitochondrial inhibitors indicated that both non-mitochondrial and mitochondrial pools are involved. Kinetic analysis of non-mitochondrial Ca2+ uptake revealed a Km of 0.1 microM Ca2+ and a Vmax of 0.4 nmol Ca2+/mg protein X min for this Ca2+-pumping ATPase activity. Mitochondria started to take up Ca2+ between 0.2 and 0.3 microM free Ca2+ reaching maximal rates around 2 microM. At 1 microM free Ca2+ mitochondria accumulated 20 times more Ca2+ than the non-mitochondrial pool. Inositol 1,4,5-trisphosphate released 40% of the Ca2+ content of the non-mitochondrial pool. Half-maximal release was observed at 0.5 and 1.5 microM IP3 in duodenal and ileal cells respectively. These findings support the possibility that the phosphatidyl inositide metabolism plays a role in regulation of electrolyte transport in enterocytes.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0143-4160
pubmed:author
pubmed:issnType
Print
pubmed:volume
8
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
197-206
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
Kinetics of ATP-dependent Ca2+ uptake by permeabilized rat enterocytes. Effects of inositol 1,4,5-trisphosphate.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't