Genes of multidrug resistance in haematological malignancies |
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Authors: | Jozef Hatok Peter Ra?ay Jan Hude?ek Du?an Dobrota |
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Institution: | (1) Department of Medical Biochemistry, Jessenius Faculty of Medicine, Mala Hora 4, Comenius University, SK-03754 Martin, Slovakia;(2) Clinic of Hematology and Transfusiology, Jessenius Faculty of Medicine and MFH, Kollárova 2, SK-03659 Martin, Slovakia |
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Abstract: | Since the early 1970s, multiple drug resistance has been known to exist in cancer cells and is thought to be attributable
to a membrane-bound, energy-dependent pump protein (P-glycoprotein P-gp]) capable of extruding various related and unrelated
chemotherapeutic drugs. The development of refractory disease in haematological malignancies is frequently associated with
the expression of one or several multidrug resistance (MDR) genes. MDR1, multidrug resistance-associated protein (MRP) and
lung-resistance protein (LRP) have been identified as important adverse prognostic factors. Recently it has become possible
to reverse clinical MDR by blocking P-gp-mediated drug efflux. The potential relevance of these reversal agents of MDR as
well as the potential new approaches to treat the refractory disease are discussed in this article. In addition, an array
of different molecules and mechanisms by which resistant cells can escape the cytotoxic effect of anticancer drugs has now
been identified. These molecules and mechanisms include apoptosis-related proteins and drug inactivation enzymes. Resistance
to chemotherapy is believed to cause treatment failure in more than 50% patients. Clearly, if drug resistance could be overcome,
the impact on survival would be highly significant. This review focuses on molecular mechanism of drug resistance in haematological
malignancies with emphasis on molecules involved in MDR. In addition, it brings the survey of methods involved in determination
of MDR, in particular P-gp/MDR1, MRP and LRP. |
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Keywords: | haematological malignancies MDR P-gp MRP LRP resistance mechanisms |
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