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pubmed-article:14754408pubmed:abstractTextA major problem in cancer treatment is the development of resistance to multiple chemotherapeutic agents in tumor cells. A major mechanism of this multidrug resistance (MDR) is overexpression of the MDR1 product P-glycoprotein, known to bind to and transport a wide variety of agents. This review concentrates on the progress made toward understanding the role of this protein in MDR, identifying and characterizing the drug binding sites of P-glycoprotein, and modulating MDR by P-glycoprotein-specific inhibitors. Since our initial discovery that P-glycoprotein binds to vinblastine photoaffinity analogs, many P-glycoprotein-specific photoaffinity analogs have been developed and used to identify the particular domains of P-glycoprotein capable of interacting with these analogs and other P-glycoprotein substrates. Furthermore, significant advances have been made in delineating the drug binding sites of this protein by studying mutant P-glycoprotein. Photoaffinity labeling experiments and the use of site-directed antibodies to several domains of this protein have allowed the localization of the general binding domains of some of the cytotoxic agents and MDR modulators on P-glycoprotein. Moreover, site-directed mutagenesis studies have identified the amino acids critical for the binding of some of these agents to P-glycoprotein. Furthermore, equilibrium binding assays using plasma membranes from MDR cells and radioactive drugs have aided our understanding of the modes of drug interactions with P-glycoprotein. Based on the available data, a topological model of P-glycoprotein and the approximate locations of its drug binding sites, as well as a proposed classification of multiple drug binding sites of this protein, is presented in this review.lld:pubmed
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pubmed-article:14754408pubmed:authorpubmed-author:SafaAhmad RARlld:pubmed
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pubmed-article:14754408pubmed:volume4lld:pubmed
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pubmed-article:14754408pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:14754408pubmed:year2004lld:pubmed
pubmed-article:14754408pubmed:articleTitleIdentification and characterization of the binding sites of P-glycoprotein for multidrug resistance-related drugs and modulators.lld:pubmed
pubmed-article:14754408pubmed:affiliationDepartment of Pharmacology and Toxicology and Indiana University Cancer Center, West Walnut Street, Indianapolis, IN 46202, USA. asafa@iupui.edulld:pubmed
pubmed-article:14754408pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:14754408pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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