H(+)-linked transport of salicylic acid, an NSAID, in the human trophoblast cell line BeWo |
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Authors: | Emoto Akiko Ushigome Fumihiko Koyabu Noriko Kajiya Hiroshi Okabe Koji Satoh Shoji Tsukimori Kiyomi Nakano Hitoo Ohtani Hisakazu Sawada Yasufumi |
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Institution: | Department of Medico-Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan. |
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Abstract: | We investigated thetransport of salicylic acid and L-lactic acid across theplacenta using the human trophoblast cell line BeWo. We performeduptake experiments and measured the change in intracellular pH(pHi). The uptakes of 14C]salicylic acid andL-14C]lactic acid were temperature- andextracellular pH-dependent and saturable at higher concentrations. Bothuptakes were also reduced by FCCP, nigericin, and NaN3.Various nonsteroidal anti-inflammatory drugs (NSAIDs) stronglyinhibited the uptake of L-14C]lactic acid.Salicylic acid and ibuprofen noncompetitively inhibited the uptake ofL-14C]lactic acid. -Cyano-4-hydroxycinnamate (CHC), a monocarboxylate transporterinhibitor, suppressed the uptake ofL-14C]lactic acid but not that of14C]salicylic acid. CHC also suppressed the decrease ofpHi induced by L-lactic acid but had littleeffect on that induced by salicylic acid or diclofenac. These resultssuggest that NSAIDs are potent inhibitors of lactate transporters,although they are transported mainly by a transport system distinctfrom that for L-lactic acid. |
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