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Molecular Pharmacology

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Research ArticleArticle

Effect of Multidrug Resistance-Reversing Agents on Transporting Activity of Human Canalicular Multispecific Organic Anion Transporter

Zhe-Sheng Chen, Takeshi Kawabe, Mayumi Ono, Shunji Aoki, Tomoyuki Sumizawa, Tatsuhiko Furukawa, Takeshi Uchiumi, Morimasa Wada, Michihiko Kuwano and Shin-Ichi Akiyama
Molecular Pharmacology December 1999, 56 (6) 1219-1228; DOI: https://doi.org/10.1124/mol.56.6.1219
Zhe-Sheng Chen
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Takeshi Kawabe
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Mayumi Ono
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Shunji Aoki
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Tomoyuki Sumizawa
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Tatsuhiko Furukawa
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Takeshi Uchiumi
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Morimasa Wada
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Michihiko Kuwano
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Shin-Ichi Akiyama
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Abstract

The canalicular multispecific organic anion transporter (cMOAT), also termed MRP2, is a recently identified ATP-binding cassette transporter. We previously established stable human cMOAT cDNA-transfected cells, LLC/cMOAT-1 from LLC-PK1 cells, and LLC/CMV cells that were transfected with an empty vector. We found that LLC/cMOAT-1 cells have increased resistance to vincristine (VCR), 7-ethyl-10-hydroxy-camptothecin, and cisplatin but not to etoposide. The multidrug resistance-reversing agents cyclosporin A (CsA) and 2-[4-(diphenylmethyl)-1-piperazinyl]-5-(trans-4,6-dimethyl-1,3,2-dioxaphosphorinan-2-yl)-2,6-dimethyl-4-(3-nitrophenyl)-3-pyridinecarboxylate P-oxide (PAK-104P) almost completely reversed the resistance to VCR, 7-ethyl-10-hydroxy-camptothecin, and cisplatin of LLC/cMOAT-1 cells; anddl-buthionine-(S,R)-sulfoximine, (3′-oxo-4-butenyl-4-methyl-threonine1, (valine2) cyclosporin (PSC833), and 3-([{3-(2-[7-chloro-2-quinolinyl]ethenyl)phenyl}-{(3-dimethylamino-3-oxopropyl)-thio}-methyl]thio)propanoic acid (MK571) partially reversed the resistance to these drugs. CsA and PAK-104P at 10 μM enhanced the accumulation of VCR in LLC/cMOAT-1 cells almost to the level in LLC/CMV cells without the agents. The efflux of VCR from LLC/cMOAT-1 cells was enhanced compared with LLC/CMV cells and inhibited by CsA and PAK-104P. Transport of leukotriene C4 (LTC4) and S-(2, 4-dinitrophenyl)glutathione also was studied with membrane vesicles prepared from these cells. LTC4 and S-(2, 4-dinitrophenyl)glutathione were actively transported into membrane vesicles prepared from LLC/cMOAT-1 cells. TheK m and V maxvalues for the uptake of LTC4 by the LLC/cMOAT-1 membrane vesicles were 0.26 ± 0.05 μM and 7.48 ± 0.67 pmol/min/mg protein, respectively. LTC4 transport was competitively inhibited by PAK-104P, CsA, MK571, and PSC833, withK i values of 3.7, 4.7, 13.1, and 28.9 μM, respectively. These findings demonstrate that cMOAT confers a novel drug-resistance phenotype. CsA and PAK-104P may be useful for reversing cMOAT-mediated drug resistance in tumors.

Footnotes

    • Received May 17, 1999.
    • Accepted August 24, 1999.
  • Send reprint requests to: Dr. Shin-ichi Akiyama, Department of Cancer Chemotherapy, Institute for Cancer Research, Faculty of Medicine, Kagoshima University, 8–35-1 Sakuragaoka Kagoshima 890-8520, Japan. E-mail:akiyamas{at}khosp2.kufm.kagoshima-u.ac.jp

  • This work was supported by grants from the Ministry of Education, Science, and Culture; the Ministry of Health and Welfare, Japan; and Japan Society for the Promotion of Science.

  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 56 (6)
Molecular Pharmacology
Vol. 56, Issue 6
1 Dec 1999
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Research ArticleArticle

Effect of Multidrug Resistance-Reversing Agents on Transporting Activity of Human Canalicular Multispecific Organic Anion Transporter

Zhe-Sheng Chen, Takeshi Kawabe, Mayumi Ono, Shunji Aoki, Tomoyuki Sumizawa, Tatsuhiko Furukawa, Takeshi Uchiumi, Morimasa Wada, Michihiko Kuwano and Shin-Ichi Akiyama
Molecular Pharmacology December 1, 1999, 56 (6) 1219-1228; DOI: https://doi.org/10.1124/mol.56.6.1219

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Research ArticleArticle

Effect of Multidrug Resistance-Reversing Agents on Transporting Activity of Human Canalicular Multispecific Organic Anion Transporter

Zhe-Sheng Chen, Takeshi Kawabe, Mayumi Ono, Shunji Aoki, Tomoyuki Sumizawa, Tatsuhiko Furukawa, Takeshi Uchiumi, Morimasa Wada, Michihiko Kuwano and Shin-Ichi Akiyama
Molecular Pharmacology December 1, 1999, 56 (6) 1219-1228; DOI: https://doi.org/10.1124/mol.56.6.1219
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