Mechanism of L-lactic Acid Transport in L6 Skeletal Muscle Cells
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- KOBAYASHI Masaki
- Department of Clinical Pharmaceutics & Therapeutics, Graduate School of Pharmaceutical Sciences, Hokkaido University
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- ITAGAKI Shirou
- Department of Clinical Pharmaceutics & Therapeutics, Graduate School of Pharmaceutical Sciences, Hokkaido University
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- HIRANO Takeshi
- Department of Clinical Pharmaceutics & Therapeutics, Graduate School of Pharmaceutical Sciences, Hokkaido University
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- ISEKI Ken
- Department of Clinical Pharmaceutics & Therapeutics, Graduate School of Pharmaceutical Sciences, Hokkaido University
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L-lactic acid transport plays an important role in the regulation of L-lactic acid circulation into and out of muscle. To clarify the transport mechanism of L-lactic acid in skeletal muscle, L-lactic acid uptake was investigated using a L6 cell line. mRNAs of monocarboxylate transporter (MCT) 1, 2 and 4 were found to be expressed in L6 cells. The [14C] L-lactic acid uptake by L6 cells increased up to pH of 6.0. The [14C] L-lactic acid uptake at pH 6.0 was concentration-dependent with a Km of 3.7 mM. This process was reduced by α-cyano-4-hydroxycinnamate, a typical MCT1, 2 and 4 inhibitor. These results suggest that an MCT participates in the uptake of L-lactic acid by L6 cells. [14C] L-lactic acid uptake was markedly inhibited by monocarboxylic acids and monocarboxylate drugs but not by dicarboxylic acids and amino acids. Moreover, benzoic acid, a substrate for MCT1, competitively inhibited this process with Ki of 1.7 mM. [14C] L-lactic acid efflux in L6 cells was inhibited by α-cyano-4-hydroxycinnamate but not by benzoic acid. These results suggest that [14C] L-lactic acid efflux in L6 cells is mediated by MCT other than MCT1.<br>
収録刊行物
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- Drug Metabolism and Pharmacokinetics
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Drug Metabolism and Pharmacokinetics 19 (5), 363-368, 2004
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詳細情報 詳細情報について
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- CRID
- 1390001205178011776
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- NII論文ID
- 10014314650
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- NII書誌ID
- AA1162652X
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- COI
- 1:CAS:528:DC%2BD2MXhtVyhsw%3D%3D
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- ISSN
- 18800920
- 13474367
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- PubMed
- 15548847
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可