Mechanisms of altered sequestration and efflux of chemotherapeutic drugs by multidrug-resistant cells |
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Authors: | Z Ouar R Lacave M Bens A Vandewalle |
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Institution: | 1. Faculté de Médecine Xavier, Institut National de la Santé et de la Recherche Médicale, Inserm U478 Institut Fédératif de Recherche 02, Bichat, Paris 2. Laboratoire d'Histologie et Biologie Tumorale, H?pital Tenon, 4 rue de la Chine, 75020, Paris, France
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Abstract: | This review considers the mechanisms associated with the pleiotropic resistance of cancer cells to chemotherapeutic drugs,
and more particularly those related to intracellular pH (pHi). The multidrug resistance (MDR) phenomenon responsible for the
decreased accumulation and increased efflux of cytotoxic drugs is generally associated with excess levels of P-glycoproteins
(Pgps) encoded by MDR genes and/or the multidrug resistance-associated protein (MRP). MDR cell lines, derived from normal
or tumor cells, frequently exhibit abnormally elevated pHi and changes in the production of various proteins. Recent studies
have suggested that, in addition to the impact of the ATP-dependent membrane transporters Pgp and MRP on drug transport, other
mechanisms linked to pHi changes in MDR cells may play an important role in drug resistance. We have shown that alkalinization
of the acidic compartments (endosomes and lysosomes) by lysosomotropic agents could stimulate the efflux of vinblastine from
drug-resistant mouse renal proximal tubule cells. The fact that weak base chemotherapeutic drugs can be sequestered within
the acidic organelles of MDR cells sheds new light on the cellular mechanisms of drug resistance.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | intracellular pH kidney cells lysosome MDR MRP P-glycoprotein |
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