P-glycoprotein-activity measurements in multidrug resistant cell lines: Single-cell versus single-well population fluorescence methods

Jennifer Pasquier, Damien Rioult, Nadine Abu-Kaoud, Sabine Marie, Arash Rafii Tabrizi, Bella S. Guerrouahen, Frank Le Foll

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Background. P-gp expression has been linked to the efflux of chemotherapeutic drugs in human cancers leading to multidrug resistance. Fluorescence techniques have been widely applied to measure the P-gp activity. In this paper, there is a comparison between the advantages of two fluorescence approaches of commonly available and affordable instruments: the microplate reader (MPR) and the flow cytometer to detect the P-gp efflux activity using calcein-AM. Results. The selectivity, sensibility, and reproducibility of the two methods have been defined. Our results showed that the MPR is more powerful for the detection of small inhibition, whereas the flow cytometry method is more reliable at higher concentrations of the inhibitors. We showed that to determine precisely the inhibition efficacy the flow cytometry is better; hence, to get the correct Emax and EC50 values, we cannot only rely on the MPR. Conclusion. Both techniques can potentially be used extensively in the pharmaceutical industry for high-throughput drug screening and in biology laboratories for academic research, monitoring the P-gp efflux in specific assays.

Original languageEnglish
Article number676845
JournalBioMed Research International
Publication statusPublished - 2013


ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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