H+-linked transport of salicylic acid, an NSAID, in the human trophoblast cell line BeWo

Akiko Emoto, Fumihiko Ushigome, Noriko Koyabu, Hiroshi Kajiya, Koji Okabe, Shoji Satoh, Kiyomi Tsukimori, Hitoo Nakano, Hisakazu Ohtani, Yasufumi Sawada

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Abstract

We investigated the transport of salicylic acid and L-lactic acid across the placenta using the human trophoblast cell line BeWo. We performed uptake experiments and measured the change in intracellular pH (pHi). The uptakes of [14C] salicylic acid and L-[14C] lactic acid were temperature- and extracellular pH-dependent and saturable at higher concentrations. Both uptakes were also reduced by FCCP, nigericin, and NaN3. Various nonsteroidal anti-inflammatory drugs (NSAIDs) strongly inhibited the uptake of L-[14C] lactic acid. Salicylic acid and ibuprofen noncompetitively inhibited the uptake of L-[14C] lactic acid. α-Cyano-4-hydroxycinnamate (CHC), a monocarboxylate transporter inhibitor, suppressed the uptake of L-[14C] lactic acid but not that of [14C] salicylic acid. CHC also suppressed the decrease of pHi induced by L-lactic acid but had little effect on that induced by salicylic acid or diclofenac. These results suggest that NSAIDs are potent inhibitors of lactate transporters, although they are transported mainly by a transport system distinct from that for L-lactic acid.

Original languageEnglish
Pages (from-to)C1064-C1075
JournalAmerican Journal of Physiology - Cell Physiology
Volume282
Issue number5 51-5
Publication statusPublished - 2002 Jul 2
Externally publishedYes

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Keywords

  • Blood-placental barrier
  • Intracellular pH
  • L-lactic acid
  • Monocarboxylate transporter
  • α-cyano-4-hydroxycinnamate

ASJC Scopus subject areas

  • Physiology
  • Cell Biology

Cite this

Emoto, A., Ushigome, F., Koyabu, N., Kajiya, H., Okabe, K., Satoh, S., Tsukimori, K., Nakano, H., Ohtani, H., & Sawada, Y. (2002). H+-linked transport of salicylic acid, an NSAID, in the human trophoblast cell line BeWo. American Journal of Physiology - Cell Physiology, 282(5 51-5), C1064-C1075.