Interaction between anticonvulsants and human placental carnitine transporter.

Abstract:

PURPOSE:To examine the inhibitory effect of anticonvulsants (AEDs) on carnitine transport by the human placental carnitine transporter. METHODS:Uptake of radiolabeled carnitine by human placental brush-border membrane vesicles was measured in the absence and presence of tiagabine (TGB), vigabatrin (VGB), gabapentin (GBP), lamotrigine (LTG), topiramate (TPM), valproic acid (VPA), and phenytoin (PHT). The mechanism of the inhibitory action of TGB was determined. RESULTS:Most of the AEDs inhibited placental carnitine transport. Kinetic analyses showed that TGB had the greatest inhibitory effect [50% inhibitory concentration (IC50, 190 microM)], and the order of inhibitory potency was TGB > PHT > GBP > VPA > VGB, TPM > LTG. Further studies showed that TGB competitively inhibited carnitine uptake by the human placental carnitine transporter, suggesting that it may be a substrate for this carrier. CONCLUSIONS:Although the involvement of carnitine deficiency in fetal anticonvulsant syndrome requires further evaluation, potential interference with placental carnitine transport by several AEDs was demonstrated. Despite the higher inhibitory potency of TGB, given the therapeutic unbound concentrations, the results for VPA and PHT are probably more clinically significant.

journal_name

Epilepsia

journal_title

Epilepsia

authors

Wu SP,Shyu MK,Liou HH,Gau CS,Lin CJ

doi

10.1111/j.0013-9580.2004.29603.x

subject

Has Abstract

pub_date

2004-03-01 00:00:00

pages

204-10

issue

3

eissn

0013-9580

issn

1528-1167

journal_volume

45

pub_type

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