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2005 | 52 | 3 | 609-627
Article title

Strategies for overcoming ABC-transporters-mediated multidrug resistance (MDR) of tumor cells

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EN
Abstracts
EN
The development of multidrug resistance (MDR) of tumors is a major cause of failure in antitumor chemotherapy. This type of crossresistance is due to the expression of ABC transporter glycoproteins actively effluxing the drug from the cells against the concentration gradient at the expense of metabolic energy, thus preventing the accumulation in cells of therapeutic concentration of active agents. In this review strategies for overcoming this adverse phenomenon are discussed. They comprise the control of expression of MDR glycoprotein transporters and control of the functioning of the expressed transporter proteins. The latter approach is discussed in more detail, comprising the following general strategies: (i) development of compounds that are not substrates of efflux pump(s), (ii) use of agents that inactivate (inhibit) MDR proteins, (iii) design of cytostatics characterized by fast cellular uptake, surpassing their mediated efflux, (iv) use of compounds competing with the drug for the MDR protein-mediated efflux. Positive and negative aspects of these strategies are analysed, with special attention put on strategy based on the use of MDR modulators in combination therapy, allowing the restoration of cytotoxic activity of clinical cytostatics towards resistant tumor cells.
Year
Volume
52
Issue
3
Pages
609-627
Physical description
Dates
published
2005
received
2005-05-24
revised
2005-06-23
accepted
2005-07-29
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