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Functional intracellular P-glycoprotein

A B Shapiro1, K Fox, P Lee

  • 1British Columbia Cancer Research Centre, Vancouver, Canada.

International Journal of Cancer
|June 17, 1998
PubMed
Summary
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P-glycoprotein (P-gp) sequesters chemotherapy drugs in cellular vesicles, contributing to multidrug resistance. Inhibiting P-gp releases these drugs, overcoming resistance and enabling cancer cell death.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • P-glycoprotein (P-gp) efflux at the plasma membrane is a primary driver of cancer multidrug resistance.
  • The precise mechanisms of P-gp action in multidrug resistance are still under investigation.

Purpose of the Study:

  • To investigate the intracellular localization and function of P-gp in drug sequestration.
  • To explore the potential of targeting cytoplasmic P-gp drug sequestration to overcome multidrug resistance.

Main Methods:

  • Flow cytometry to quantify drug accumulation.
  • Confocal immunofluorescence and immunoelectron microscopy to detect P-gp localization.
  • Epifluorescence microscopy to visualize vesicular drug localization.
  • Quantitative assays to measure drug sequestration.

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Main Results:

  • P-gp concentrates drugs like Hoechst 33342 and daunorubicin within cytoplasmic vesicles in resistant cells.
  • Cytoplasmic sequestration by P-gp accounts for a significant portion of drug accumulation.
  • Inhibiting P-gp with cyclosporin A releases sequestered daunorubicin, leading to cell death.
  • P-gp is localized in the membranes of these cytoplasmic vesicles, distinct from endocytic vesicles.

Conclusions:

  • P-gp mediates drug sequestration within cytoplasmic vesicles, contributing to multidrug resistance.
  • Targeting P-gp-mediated drug release from these vesicles offers a novel strategy to overcome cancer multidrug resistance.