Linked Life Data

6842580

Source:http://linkedlifedata.com/resource/pubmed/id/6842580

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1983-6-10
pubmed:abstractText
Membrane transport of lactate was studied using vesicles prepared from horse kidney brush border. It is shown that the carrier-mediated transport of L-lactate is Na dependent and the D-lactate Na dependence seems weaker than the L stereoisomer. Augmented transport rate is observed following imposition of an artificial chemical Na+ gradient of electrical potential difference. The effect of Na+ chemical gradient on the L-lactate uptake was analyzed using membrane vesicles incubated with 50 mM KCl and valinomycin in order to short circuit any contribution of transmembrane electrical potential to the transport. Kinetics results and principally the absence of linearity between l/v (lactate) versus l/Na+ show that the L-lactate transport mechanism fit the properties of an ordered process with two Na+ ions cotransported with one L-lactate anion. The L-lactate and sodium affinities (Km) determined under Na+ chemical gradient were 1.05 and 48 mM for L-lactate and Na, respectively. The sodium activation was shown to be highly cooperative with a Hill number of 2 although no "sigmoidal" activation effect was observed.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0022-2631
pubmed:author
pubmed:issnType
Print
pubmed:volume
71
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
163-71
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1983
pubmed:articleTitle
The mechanism of Na+-L-lactate cotransport by brush border membrane vesicles from horse kidney: analysis of rapid equilibrium kinetics in absence of membrane potential.
pubmed:publicationType
Journal Article, Comparative Study, In Vitro