Quantitative study of the drug efflux kinetics from sensitive and MDR human breast cancer cells
Chenguang Zhou1, Peng Shen, Yiyu Cheng
1Pharmaceutical and Informatics Institute, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310027, China.
Abstract:
Cancer multidrug resistance (MDR) is a major impediment to effective chemotherapy in human cancer, in which P-glycoprotein and Multidrug Resistance-Associated protein figure prominently. Design and exploitation of novel clinical MDR inhibitors is greatly hindered by a lack of understanding of drug efflux dynamics in drug-sensitive and resistant cells. The aim of our study was to provide a microelectrode method for measuring the multidrug transporter mediated efflux of doxorubicin as well as a corresponding data analysis method for quantifying the efflux kinetic parameters. We performed experiments using carbon fiber microelectrode to detect doxorubicin efflux from a monolayer of human breast cancer MCF-7 cells and derived MDR cells (MCF-7/ADR), established a material transport model and proposed a novel inverse method to quantitatively characterize the diffusion dynamics. The kinetic parameters of doxorubicin efflux from MCF-7 and MCF-7/ADR cells in the presence or absence of MDR inhibitors were estimated. Our investigations showed the average initial doxorubicin efflux rate of MCF-7/ADR that was 5.2 times faster than of MCF-7. After treatment by tetramethylpyrazine or verapamil, the drug efflux rate of the MCF-7/ADR cells was reduced by about half that of those without inhibitors. The novel methodology presented suggests new and expanded applications for computer-aided reconstruction of the drug efflux process, microelectrode design, and high-throughput drug screening.
Insights
This study introduces a microelectrode method to measure doxorubicin efflux in cancer cells, revealing multidrug resistance (MDR) cells expel drugs 5.2 times faster. MDR inhibitors effectively reduced this drug efflux rate, aiding chemotherapy development.
Area of Science:
- Biomedical Engineering
- Cancer Research
- Pharmacology
Background:
- Cancer multidrug resistance (MDR) significantly limits chemotherapy efficacy.
- Key players in MDR include P-glycoprotein and Multidrug Resistance-Associated proteins.
- Understanding drug efflux dynamics is crucial for developing novel MDR inhibitors.
Purpose of the Study:
- To develop a microelectrode method for measuring doxorubicin efflux mediated by multidrug transporters.
- To establish a data analysis method for quantifying efflux kinetic parameters.
- To investigate drug efflux dynamics in sensitive and resistant cancer cells.
Main Methods:
- Utilized carbon fiber microelectrodes to detect doxorubicin efflux from MCF-7 and MCF-7/ADR human breast cancer cells.
- Established a material transport model and employed an inverse method for quantitative diffusion dynamics.
- Estimated kinetic parameters of doxorubicin efflux with and without MDR inhibitors (tetramethylpyrazine, verapamil).
Main Results:
- MCF-7/ADR cells exhibited an initial doxorubicin efflux rate 5.2 times faster than MCF-7 cells.
- Tetramethylpyrazine and verapamil reduced the drug efflux rate in MCF-7/ADR cells by approximately 50%.
- The developed methodology allows for quantitative characterization of drug efflux processes.
Conclusions:
- The novel microelectrode method effectively quantifies drug efflux kinetics in cancer cells.
- This technique provides insights into multidrug resistance mechanisms and transporter activity.
- The methodology supports applications in computer-aided drug efflux reconstruction and high-throughput screening.
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