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Research ArticleArticle

Efflux of Glutathione Conjugate of Monochlorobimane from Striatal and Cortical Neurons

Heleen H. DeCory, Kristen M. Piech-Dumas, Shey-Shing Sheu, Howard J. Federoff and M. W. Anders
Drug Metabolism and Disposition October 2001, 29 (10) 1256-1262;
Heleen H. DeCory
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Kristen M. Piech-Dumas
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Shey-Shing Sheu
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Howard J. Federoff
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M. W. Anders
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Abstract

Evidence for the presence of a novel transporter in primary cultures of rat striatal neurons and mouse cortical neurons similar in function to the multidrug resistance-associated protein (MRP1) is presented. Functional activity was assessed by efflux studies with the glutathione conjugate of monochlorobimane (B-SG). The glutathione transferase-catalyzed formation of B-SG in rat striatal neurons and mouse cortical neurons was inhibited by ethacrynic acid. The efflux of B-SG from rat striatal neurons and mouse cortical neurons was lower at 20°C than at 37°C and was lower in cells with reduced ATP concentrations compared with cells with constitutive ATP concentrations. In addition, the efflux of B-SG was inhibited by MK-571 in both rat striatal and mouse cortical neurons and by probenecid in rat striatal neurons, but not in mouse cortical neurons. Verapamil did not inhibit B-SG efflux in either rat striatal or mouse cortical neurons. Although functionally similar to MRP1, Western blot analysis with commercially available antibodies directed against human and mouse MRP1 failed to show MRP1-like protein in either whole-cell homogenates of rat striatal neurons or mouse cortical neurons, indicating that the described neuronal transporter differs in structure from human or mouse MRP1 or lacks epitopes in common with MRP1.

Footnotes

  • ↵1 Current address: Celltech Americas, Inc., P.O. Box 31710, 755 Jefferson Rd., Rochester, NY 14603.

  • This research was supported by National Institutes of Health Grants NS37710 (to S.-S.S.), HD31300 (to H.J.F.), and ES07026 (to K.M.P.-D.).

  • Abbreviations used are::
    MRP1
    multidrug resistance-associated protein
    ABC
    ATP-binding cassette
    mClB
    monochlorobimane
    B-SG
    glutathione conjugate of monochlorobimane
    MK-571
    sodium (±)-3-[[[3-[2-(7-chloro-2-quinolinyl)-(E)-ethenyl]phenyl][[3-(dimethylamino)-3-oxopropyl]thiol]methyl]thio]propionate
    HPLC
    high-performance liquid chromatography
    PBS
    phosphate-buffered saline
    • Received January 2, 2001.
    • Accepted June 8, 2001.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 29 (10)
Drug Metabolism and Disposition
Vol. 29, Issue 10
1 Oct 2001
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Research ArticleArticle

Efflux of Glutathione Conjugate of Monochlorobimane from Striatal and Cortical Neurons

Heleen H. DeCory, Kristen M. Piech-Dumas, Shey-Shing Sheu, Howard J. Federoff and M. W. Anders
Drug Metabolism and Disposition October 1, 2001, 29 (10) 1256-1262;

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Research ArticleArticle

Efflux of Glutathione Conjugate of Monochlorobimane from Striatal and Cortical Neurons

Heleen H. DeCory, Kristen M. Piech-Dumas, Shey-Shing Sheu, Howard J. Federoff and M. W. Anders
Drug Metabolism and Disposition October 1, 2001, 29 (10) 1256-1262;
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