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Related Experiment Videos

Exploring multidrug resistance using rhodamine 123.

D Kessel1

  • 1Department of Pharmacology, Wayne State University School of Medicine, Detroit, MI 48201.

Cancer Communications
|January 1, 1989
PubMed
Summary
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Rhodamine 123 dye uptake differs between leukemia cells and their multidrug-resistant counterparts. Resistance alters dye binding sites and accumulation, suggesting potential mechanisms for multidrug resistance.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Pharmacology

Background:

  • Multidrug resistance (MDR) in cancer involves cellular mechanisms that confer resistance to various chemotherapeutic agents.
  • Understanding the biophysical properties of drug transport in resistant cells is crucial for developing effective treatment strategies.

Purpose of the Study:

  • To investigate the differential accumulation and binding characteristics of rhodamine 123 in sensitive (P388) and Adriamycin-resistant (P388/ADR) murine leukemia cells.
  • To explore the impact of verapamil on dye accumulation in resistant cells.

Main Methods:

  • Fluorescence spectroscopy was employed to characterize rhodamine 123 uptake and localization in P388 and P388/ADR cells.
  • Temperature-sensitivity studies and spectral analysis were conducted to determine dye-binding site properties.

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Main Results:

  • Rhodamine 123 uptake was slow and temperature-sensitive in P388 cells, binding to hydrophobic sites.
  • In P388/ADR cells, uptake was rapid, temperature-insensitive, and involved hydrophilic binding sites.
  • Verapamil treatment enhanced rhodamine 123 accumulation at hydrophobic sites in P388/ADR cells.

Conclusions:

  • The distinct dye accumulation patterns suggest altered intracellular transport or sequestration mechanisms in multidrug-resistant leukemia cells.
  • Rhodamine 123 may not effectively reach the cytoplasm in P388/ADR cells, offering insights into MDR mechanisms.