Identification of two distinct intracellular sites that contribute to the modulation of multidrug resistance in P388/ADR cells expressing P‐glycoprotein
Identifieur interne : 001A25 ( Istex/Corpus ); précédent : 001A24; suivant : 001A26Identification of two distinct intracellular sites that contribute to the modulation of multidrug resistance in P388/ADR cells expressing P‐glycoprotein
Auteurs : Lawrence D. Mayer ; Kye-Taek Lim ; Daria HartleySource :
- Journal of Experimental Therapeutics and Oncology [ 1359-4117 ] ; 2002-03.
Abstract
Although the ability of chemosensitizers to modulate P‐glycoprotein (PGP)‐based multidrug resistance (MDR) has been extensively studied, relatively little is known about the cellular pharmacology of the PGP inhibitors themselves in MDR cells. The studies described here have correlated the in vitro accumulation and retention properties of verapamil (VRP) in murine P388 (sensitive) and P388/ADR (MDR) cells with doxorubicin (DOX) uptake and cytotoxicity modulation characteristics in order to better understand VRP–tumor cell interactions that give rise to MDR modulation. VRP is rapidly taken up by DOX‐sensitive and ‐resistant P388 cells where greater than 50% maximal VRP uptake occurs within 10 min of initial exposure at 37°C. Whereas chemosensitization and DOX uptake in P388/ADR cells increase with increasing VRP concentration until a plateau is achieved at approximately 5 μM VRP, cellular modulator levels increase proportionally with increasing VPR concentrations beyond 20 μM. Subsequent to removal of noncell‐associated modulator, VRP levels in both sensitive and resistant cells rapidly fall below 10% of those obtained at uptake equilibrium. However, a residual amount of VRP remains associated with the cells for extended time periods after the cells are washed. Pulse exposures of P388/ADR cells to high concentrations of VRP (50–100 μM) are capable of providing extended cell‐associated VRP levels comparable to those obtained with continuous exposure at biologically active VRP concentrations (1–3 μM) and this leads to chemosensitization. These results are consistent with the existence of high‐ and low‐affinity intracellular VRP pools in P388 MDR cells, both of which can contribute to the reversal of drug resistance. It is suggested that these properties should be taken into consideration during the design and evaluation of preclinical in vivo MDR models where pulsed exposure to high concentrations of resistance modulators often occurs. Special attention must be given to whether such high concentration pulses are desirable and/or achievable in relevant clinical settings.
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DOI: 10.1046/j.1359-4117.2002.1009x.x
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<front><div type="abstract" xml:lang="en">Although the ability of chemosensitizers to modulate P‐glycoprotein (PGP)‐based multidrug resistance (MDR) has been extensively studied, relatively little is known about the cellular pharmacology of the PGP inhibitors themselves in MDR cells. The studies described here have correlated the in vitro accumulation and retention properties of verapamil (VRP) in murine P388 (sensitive) and P388/ADR (MDR) cells with doxorubicin (DOX) uptake and cytotoxicity modulation characteristics in order to better understand VRP–tumor cell interactions that give rise to MDR modulation. VRP is rapidly taken up by DOX‐sensitive and ‐resistant P388 cells where greater than 50% maximal VRP uptake occurs within 10 min of initial exposure at 37°C. Whereas chemosensitization and DOX uptake in P388/ADR cells increase with increasing VRP concentration until a plateau is achieved at approximately 5 μM VRP, cellular modulator levels increase proportionally with increasing VPR concentrations beyond 20 μM. Subsequent to removal of noncell‐associated modulator, VRP levels in both sensitive and resistant cells rapidly fall below 10% of those obtained at uptake equilibrium. However, a residual amount of VRP remains associated with the cells for extended time periods after the cells are washed. Pulse exposures of P388/ADR cells to high concentrations of VRP (50–100 μM) are capable of providing extended cell‐associated VRP levels comparable to those obtained with continuous exposure at biologically active VRP concentrations (1–3 μM) and this leads to chemosensitization. These results are consistent with the existence of high‐ and low‐affinity intracellular VRP pools in P388 MDR cells, both of which can contribute to the reversal of drug resistance. It is suggested that these properties should be taken into consideration during the design and evaluation of preclinical in vivo MDR models where pulsed exposure to high concentrations of resistance modulators often occurs. Special attention must be given to whether such high concentration pulses are desirable and/or achievable in relevant clinical settings.</div>
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<profileDesc><abstract xml:lang="en" style="main"><p>Although the ability of chemosensitizers to modulate P‐glycoprotein (PGP)‐based multidrug resistance (MDR) has been extensively studied, relatively little is known about the cellular pharmacology of the PGP inhibitors themselves in MDR cells. The studies described here have correlated the in vitro accumulation and retention properties of verapamil (VRP) in murine P388 (sensitive) and P388/ADR (MDR) cells with doxorubicin (DOX) uptake and cytotoxicity modulation characteristics in order to better understand VRP–tumor cell interactions that give rise to MDR modulation. VRP is rapidly taken up by DOX‐sensitive and ‐resistant P388 cells where greater than 50% maximal VRP uptake occurs within 10 min of initial exposure at 37°C. Whereas chemosensitization and DOX uptake in P388/ADR cells increase with increasing VRP concentration until a plateau is achieved at approximately 5 μM VRP, cellular modulator levels increase proportionally with increasing VPR concentrations beyond 20 μM. Subsequent to removal of noncell‐associated modulator, VRP levels in both sensitive and resistant cells rapidly fall below 10% of those obtained at uptake equilibrium. However, a residual amount of VRP remains associated with the cells for extended time periods after the cells are washed. Pulse exposures of P388/ADR cells to high concentrations of VRP (50–100 μM) are capable of providing extended cell‐associated VRP levels comparable to those obtained with continuous exposure at biologically active VRP concentrations (1–3 μM) and this leads to chemosensitization. These results are consistent with the existence of high‐ and low‐affinity intracellular VRP pools in P388 MDR cells, both of which can contribute to the reversal of drug resistance. It is suggested that these properties should be taken into consideration during the design and evaluation of preclinical in vivo MDR models where pulsed exposure to high concentrations of resistance modulators often occurs. Special attention must be given to whether such high concentration pulses are desirable and/or achievable in relevant clinical settings.</p>
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<titleGroup><title type="main">Identification of two distinct intracellular sites that contribute to the modulation of multidrug resistance in P388/ADR cells expressing P‐glycoprotein</title>
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<abstract lang="en">Although the ability of chemosensitizers to modulate P‐glycoprotein (PGP)‐based multidrug resistance (MDR) has been extensively studied, relatively little is known about the cellular pharmacology of the PGP inhibitors themselves in MDR cells. The studies described here have correlated the in vitro accumulation and retention properties of verapamil (VRP) in murine P388 (sensitive) and P388/ADR (MDR) cells with doxorubicin (DOX) uptake and cytotoxicity modulation characteristics in order to better understand VRP–tumor cell interactions that give rise to MDR modulation. VRP is rapidly taken up by DOX‐sensitive and ‐resistant P388 cells where greater than 50% maximal VRP uptake occurs within 10 min of initial exposure at 37°C. Whereas chemosensitization and DOX uptake in P388/ADR cells increase with increasing VRP concentration until a plateau is achieved at approximately 5 μM VRP, cellular modulator levels increase proportionally with increasing VPR concentrations beyond 20 μM. Subsequent to removal of noncell‐associated modulator, VRP levels in both sensitive and resistant cells rapidly fall below 10% of those obtained at uptake equilibrium. However, a residual amount of VRP remains associated with the cells for extended time periods after the cells are washed. Pulse exposures of P388/ADR cells to high concentrations of VRP (50–100 μM) are capable of providing extended cell‐associated VRP levels comparable to those obtained with continuous exposure at biologically active VRP concentrations (1–3 μM) and this leads to chemosensitization. These results are consistent with the existence of high‐ and low‐affinity intracellular VRP pools in P388 MDR cells, both of which can contribute to the reversal of drug resistance. It is suggested that these properties should be taken into consideration during the design and evaluation of preclinical in vivo MDR models where pulsed exposure to high concentrations of resistance modulators often occurs. Special attention must be given to whether such high concentration pulses are desirable and/or achievable in relevant clinical settings.</abstract>
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