Linked Life Data

12840165

Source:http://linkedlifedata.com/resource/pubmed/id/12840165

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2003-7-3
pubmed:abstractText
Clinical data demonstrate that certain antiepileptic drugs including carbamazepine (CBZ) decrease serum biotin concentration 45-50% and increase urine and serum organic acids, which is suggestive of reduced function of biotin-dependent enzymes. However, little is known about biotin-dependent enzyme function at the tissue level in patients undergoing long-term CBZ treatment. We recently established that dietary CBZ administration to rats increases brain lactate and also decreases specific enzymatic activity and the relative abundance of hepatic biotinylated pyruvate carboxylase (PC). To examine the mechanism of altered activity and abundance of biotinylated PC, the effect of orally administered CBZ on hepatic PC protein and mRNA expression was examined in rats consuming a physiologically relevant level of dietary biotin (0.06 mg/kg). Rats were fed 0 or 3.4 g CBZ/kg diet for 28 d, a dose designed to achieve clinically relevant serum CBZ concentrations. Hepatic biotinylated PC and PC activity were significantly reduced by approximately 43 and 30%, respectively, in the drug-treated group. Liver PC protein expression and mRNA were approximately 43 and 35% lower, respectively, in the drug-treated group than in controls. Brain biotinylated PC was significantly lower (29%), whereas specific enzymatic activity was 175% higher in rats consuming the 3.4 g CBZ/kg diet. Brain, but not serum, lactate was significantly higher in rats consuming CBZ. Taken together, the lower PC protein and mRNA expression provide a plausible biochemical mechanism to explain the decreased abundance of biotinylated hepatic PC observed in previous studies.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0022-3166
pubmed:author
pubmed:issnType
Print
pubmed:volume
133
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2119-24
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Dietary carbamazepine administration decreases liver pyruvate carboxylase activity and biotinylation by decreasing protein and mRNA expression in rats.
pubmed:affiliation
Center for Nutritional Sciences, Food Science and Human Nutrition Department, University of Florida, Gainesville, FL 32611, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't