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Related Experiment Videos

A novel bioassay for P-glycoprotein functionality using cytochalasin D

L Elbling1, W Berger, R M Weiss

  • 1Institute of Tumor Biology-Cancer Research, Department of Applied and Experimental Oncology, Vienna University, Austria. leonilla.elbling@univie.ac.at

Cytometry
|March 27, 1998
PubMed
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A new bioassay detects functional P-glycoprotein (P-gp) levels and chemosensitizer efficacy in multidrug resistance (MDR). This flow cytometry assay uses cytochalasin D to measure P-gp activity, offering specific detection of MDR.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Multidrug resistance (MDR) in tumor cells involves P-glycoprotein (P-gp) and MRP.
  • Current methods for assessing MDR include cytotoxicity and drug accumulation/efflux tests.

Purpose of the Study:

  • To develop a specific bioassay for detecting functional P-glycoprotein (P-gp) levels.
  • To evaluate the efficacy of chemosensitizers targeting P-gp.

Main Methods:

  • A novel assay (CD-P-gp-assay) utilizing flow cytometry to measure changes in the G2M cell cycle compartment.
  • Induction of polykaryons by exposure to cytochalasin D (CD) with and without verapamil in proliferating cells.
  • Assessment of assay specificity using various known P-gp and MRP inhibitors.

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Main Results:

  • Significant correlation observed between CD doses, chemosensitizer response, and MDR1 gene expression in 13 MDR cell models.
  • The assay demonstrated specificity, with CD activity modulation exclusively in P-gp-expressing cell lines and with P-gp chemosensitizers.
  • The CD-P-gp-assay successfully discriminated between different levels of P-gp-mediated MDR.

Conclusions:

  • The CD-P-gp-assay is a specific and sensitive tool for detecting functional P-glycoprotein (P-gp).
  • This assay can effectively assess the efficacy of P-gp-related chemosensitizers.
  • Flow cytometry measurement of CD-induced cytoskeletal activity provides a reliable method for MDR evaluation.