Journal
JOURNAL OF ETHNOPHARMACOLOGY
Volume 141, Issue 2, Pages 557-570Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.jep.2011.08.053
Keywords
Cancer; Chemotherapy; Multidrug resistance; Pharmacognosy; Phytochemistry
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P-glycoprotein belongs to the family of ATP-binding cassette (ABC) transporters. It functions in cellular detoxification, pumping a wide range of xenobiotic compounds, including anticancer drugs out of the cell. In cancerous cells, P-glycoprotein confers resistance to a broad spectrum of anticancer agents, a phenomenon termed multidrug resistance. An attractive strategy for overcoming multidrug resistance is to block the transport function of P-glycoprotein and thus increase intracellular concentrations of anticancer drugs to lethal levels. Efforts to identify P-glycoprotein inhibitors have led to numerous candidates, none of which have passed clinical trials with cancer patients due to their high toxicity. The search for naturally inhibitory products from traditional Chinese medicine may be more promising because natural products are frequently less toxic than chemically synthesized substances. In this review, we give an overview of molecular and clinical aspects of P-glycoprotein and multidrug resistance in the context of cancer as well as Chinese herbs and phytochemicals showing inhibitory activity towards P-glycoprotein. (C) 2011 Elsevier Ireland Ltd. All rights reserved.
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