Direct binding of chloroquine to the multidrug resistance protein (MRP)
Identifieur interne : 002827 ( Main/Exploration ); précédent : 002826; suivant : 002828Direct binding of chloroquine to the multidrug resistance protein (MRP)
Auteurs : Marko Vezmar [Canada] ; Elias Georges [Canada]Source :
- Biochemical Pharmacology [ 0006-2952 ] ; 1998.
English descriptors
- KwdEn :
- Teeft :
- Acad, Azide, Biochem, Biochem biophys, Biochem pharmacol, Biol, Biol chem, Borst, Cell lines, Cells transfected, Chem, Chloroquine, Chloroquine accumulation, Chloroquine efflux, Chloroquine resistance, Chloroquine transport, Cole, Deeley, Direct binding, Drug accumulation, Drug binding, Drug efflux, Drug transport, Drug transport studies, Efflux, Falciparum, Glutathione, Iaaq, Intact cells, Leukotriene, Ltc4, Monoclonal antibody, Multidrug, Multidrug resistance, Multidrug resistance protein, Natl, Other drugs, Overexpression, Parental, Parental cells, Pfmdr1, Pfmdr1 gene, Pharmacol, Photoaffinity, Plasma membranes, Plasmodium, Plasmodium falciparum, Proc, Proc natl acad, Resistant cells, Sclc cells, Sodium azide, Transporter, Tumor cell lines, Unmodified drugs, Vezmar, Vinblastine.
Abstract
Abstract: Multidrug resistance protein (MRP) transports a range of compounds that include glutathione S-conjugates, amphiphilic anionic drugs, and natural-product toxins. However, the mechanism of MRP drug binding and transport is presently unclear. We recently demonstrated the direct binding of a quinoline-based photoactive drug, N-{4-[1-hydroxy-2-(dibutylamino)ethyl] quinolin-8-yl}-4-azidosalicylamide (IAAQ), to MRP at a biologically relevant site [Vezmar et al., Biochem Biophys Res Commun 241: 104–111, 1997]. In the present report, we demonstrated that the lysosomotropic or antimalarial drug chloroquine is a substrate for MRP. Specifically, our results showed that chloroquine, similar to leukotriene C4 (LTC4) and 3-(3-(2-(7-chloro-2-quinolinyl)ethenyl-phenyl)((3-(dimethyl amino-3-oxo propyl)thio)methyl)thio) propanoic acid (MK 571), inhibits the photoaffinity labeling of MRP by IAAQ. Furthermore, cell growth assays showed MRP-expressing multidrug-resistant cells (H69/AR and HL60/AR) to be more resistant to chloroquine than their parental cells (i.e., ic50 of 121 μM versus 28 μM chloroquine for H69/AR and H69, respectively). Moreover, MK 571, an LTD4 receptor antagonist, reversed the resistance of H69/AR cells to chloroquine. Drug transport studies using [14C]chloroquine demonstrated that MRP-expressing cells accumulate less drug than the parental drug-sensitive cells. The reduced accumulation of [14C]chloroquine in resistant cells was ATP dependent and was due to enhanced drug efflux. Taken together, the results of this study show that MRP modulates the transport of chloroquine by direct binding.
Url:
DOI: 10.1016/S0006-2952(98)00217-2
Affiliations:
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ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Multidrug resistance protein (MRP) transports a range of compounds that include glutathione S-conjugates, amphiphilic anionic drugs, and natural-product toxins. However, the mechanism of MRP drug binding and transport is presently unclear. We recently demonstrated the direct binding of a quinoline-based photoactive drug, N-{4-[1-hydroxy-2-(dibutylamino)ethyl] quinolin-8-yl}-4-azidosalicylamide (IAAQ), to MRP at a biologically relevant site [Vezmar et al., Biochem Biophys Res Commun 241: 104–111, 1997]. In the present report, we demonstrated that the lysosomotropic or antimalarial drug chloroquine is a substrate for MRP. Specifically, our results showed that chloroquine, similar to leukotriene C4 (LTC4) and 3-(3-(2-(7-chloro-2-quinolinyl)ethenyl-phenyl)((3-(dimethyl amino-3-oxo propyl)thio)methyl)thio) propanoic acid (MK 571), inhibits the photoaffinity labeling of MRP by IAAQ. Furthermore, cell growth assays showed MRP-expressing multidrug-resistant cells (H69/AR and HL60/AR) to be more resistant to chloroquine than their parental cells (i.e., ic50 of 121 μM versus 28 μM chloroquine for H69/AR and H69, respectively). Moreover, MK 571, an LTD4 receptor antagonist, reversed the resistance of H69/AR cells to chloroquine. Drug transport studies using [14C]chloroquine demonstrated that MRP-expressing cells accumulate less drug than the parental drug-sensitive cells. The reduced accumulation of [14C]chloroquine in resistant cells was ATP dependent and was due to enhanced drug efflux. Taken together, the results of this study show that MRP modulates the transport of chloroquine by direct binding.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Québec</li></region><settlement><li>Montréal</li></settlement><orgName><li>Université McGill</li></orgName></list><tree><country name="Canada"><region name="Québec"><name sortKey="Vezmar, Marko" sort="Vezmar, Marko" uniqKey="Vezmar M" first="Marko" last="Vezmar">Marko Vezmar</name></region><name sortKey="Georges, Elias" sort="Georges, Elias" uniqKey="Georges E" first="Elias" last="Georges">Elias Georges</name><name sortKey="Georges, Elias" sort="Georges, Elias" uniqKey="Georges E" first="Elias" last="Georges">Elias Georges</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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