Linked Life Data

2496913

Source:http://linkedlifedata.com/resource/pubmed/id/2496913

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1989-6-9
pubmed:abstractText
The effect of valproate (0.01-10 mM), an antiepileptic drug inducing hyperammonemia in humans, was studied in vitro on a suspension of renal cortical tubules (greater than 85% proximal tubules) obtained from six normal dogs. When these tubules were incubated with 1 mM glutamine, the addition of valproate accelerated glutamine uptake, ammoniagenesis, and the production of alanine, lactate, and pyruvate. With 5 mM glutamine, a rise in glutamate accumulation, a much greater synthesis of alanine, an important aspartate production, and a striking accumulation of lactate and pyruvate were observed. With 1 or 5 mM lactate, lactate utilization and gluconeogenesis were markedly reduced with increasing concentrations of valproate. Oxygen consumption was reduced by only 15-20% by 10 mM valproate. The accelerated glutamine utilization resulting from valproate could not be prevented by aminooxyacetate, an inhibitor of transamination. Valproate also reduced various enzymatic activities, a finding that could not explain its metabolic effects. Four sites of action may explain these various metabolic changes: (i) a stimulation of mitochondrial glutamine transport, (ii) an increase in the flux of glutamate to malate, and (iii) a reduction in the net oxidation of pyruvate and (iv) in the flux through pyruvate carboxylase.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0008-4212
pubmed:author
pubmed:issnType
Print
pubmed:volume
67
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
88-97
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Metabolic effects of valproate on dog renal cortical tubules.
pubmed:affiliation
Renal Service, Notre-Dame Hospital, Montréal, Qué., Canada.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't