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    Carrier-mediated transport of valproic acid in BeWo cells, a human trophoblast cell line

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    Audus_AFD_Utoguchi Audus Int J P.pdf (361.0Kb)
    Issue Date
    2000
    Author
    Utoguchi, Naoki
    Audus, Kenneth L.
    Publisher
    Elsevier
    Type
    Article
    Article Version
    Scholarly/refereed, author accepted manuscript
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    Abstract
    The biochemical mechanisms mediating the rapid distribution of valproic acid across placenta are not precisely known. We have characterized valproic acid transport by the human trophoblast using the human choriocarcinoma cell line, BeWo. The uptake of [14C]valproic acid by BeWo cells was found to be saturable and blocked by pre-exposure to the metabolic inhibitors, sodium azide and 2,4-dinitrophenol. Valproic acid uptake by the BeWo cells was also inhibited by the protonophore, carbonylcyanide p-trifluoromethoxyphenylhydrazone (FCCP) but not anion exhange inhibitor. Selected monocarboxylic acids inhibited the uptake of [14C]valproic acid by BeWo cells, whereas dicarboxylic acids did not alter the uptake process. Analysis of Lineweaver-Burk plots of valproic acid uptake in the presence of benzoic acid, a marker for the monocarboxylic acid transporter, revealed a competitive process for uptake. In transcellular transport experiments, the permeation of [14C]valproic acid from the apical-to-basal side of the monolayers was signficantly greater than the permeation from basal-to-apical side. Additionally, the permeation of [14C]valproic acid from apical-to-basal side was inhibited by monocarboxylic acids and not dicarboxylic acids. The results provide biochemical evidence of a proton-dependent, saturable, and asymmetric transport system, presumed to be a monocarboxylic acid transporter, for valproic acid in a human trophoblast model.
    URI
    http://hdl.handle.net/1808/7495
    DOI
    https://doi.org/10.1016/S0378-5173(99)00398-1
    Collections
    • Pharmacy Scholarly Works [286]
    Citation
    Utoguchi, N. and Audus, K.L. (2000) Carrier-mediated transport of valproic acid in BeWo cells, a human trophoblast cell line. Int. J. Pharm. 195, 115-124. PMID: 10675689 http://dx.doi.org/10.1016/S0378-5173(99)00398-1

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    KU Libraries
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    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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