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Multidrug resistance protein functionality: no effect of intracellular or extracellular pH changes
C Marbeuf-Gueye1, W Priebe, A Garnier-Suillerot
1Laboratoire de Physicochimie Biomoleculaire et Cellulaire, Universite Paris Nord, 93017, Bobigny, France.
Biochemical Pharmacology
|October 6, 2000
Summary
Changes in pH do not affect multidrug resistance-associated protein 1 (MRP1) drug transport. This finding suggests pH is not a factor in MRP1-mediated multidrug resistance in cancer cells.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Multidrug resistance (MDR) in cancer is a significant challenge.
- Increased expression of ATP-binding cassette (ABC) transporters like P-glycoprotein (P-gp) and multidrug resistance-associated protein 1 (MRP1) contributes to MDR.
- Previous research indicated pH changes do not influence P-gp-mediated MDR.
Purpose of the Study:
- To investigate whether intra- or extracellular pH modifications affect MRP1-dependent multidrug resistance.
- To determine if pH influences the transport efficiency of MRP1.
Main Methods:
- Studied the MRP1-mediated efflux of hydroxyrubicin from GLC4/ADR cells.
- Utilized hydroxyrubicin, a neutral anthracycline derivative, to isolate transporter function from pH-dependent accumulation.
- Varied extracellular and intracellular pH levels to assess their impact on drug efflux kinetics.
Main Results:
- Modifications in extracellular and/or intracellular pH did not alter the MRP1-mediated efflux of hydroxyrubicin.
- The kinetics of hydroxyrubicin efflux remained unchanged across different pH conditions.
- Transporter efficiency of MRP1 was not affected by pH variations.
Conclusions:
- Intra- and extracellular pH changes do not mediate MRP1-dependent multidrug resistance.
- MRP1-mediated drug transport is independent of pH.
- These findings exclude pH as a mechanism influencing MRP1-driven drug resistance in cancer cells.