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Vol. 56, Issue 6, 1219-1228, December 1999
Department of Cancer Chemotherapy, 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;
and
DL-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. The
Km and Vmax
values 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, with
Ki 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.
Copyright © 1999 by The American Society for Pharmacology and Experimental Therapeutics
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