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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
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Bypassing multidrug resistance in human breast cancer cells with lipid/polymer particle assemblies

Bo Li1, Hui Xu, Zhen Li

  • 1College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China.

International Journal of Nanomedicine
|January 26, 2012
PubMed
Abstract

Insights

Novel lipid/particle assemblies (LNPs) effectively deliver chemotherapy drugs, bypassing multidrug resistance (MDR) in cancer cells. These LNPs enhance drug accumulation in resistant cells, improving treatment efficacy against P-glycoprotein (P-gp) overexpressing tumors.

Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Cancer Research

Background:

  • Multidrug resistance (MDR) in cancer, often mediated by P-glycoprotein (P-gp) overexpression, significantly hinders chemotherapy effectiveness.
  • Adenosine triphosphate (ATP)-binding cassette (ABC) transporters, including P-gp, are key drivers of MDR by actively exporting chemotherapeutic agents.
  • Developing strategies to overcome P-gp-mediated MDR is crucial for improving patient outcomes in cancer treatment.

Purpose of the Study:

  • To design and characterize novel lipid/particle assemblies (LNPs) for delivering anticancer drugs.
  • To investigate the ability of these LNPs to bypass P-gp-mediated multidrug resistance in human breast cancer cells.
  • To evaluate the enhanced cellular uptake, intracellular accumulation, and cytotoxicity of drug-loaded LNPs in drug-resistant cancer cells.

Main Methods:

  • Doxorubicin (DOX) was conjugated to poly(lactic-co-glycolic acid) (PLGA) and encapsulated within self-assembled LNPs composed of a PLGA core and a lipid shell.
  • Physicochemical properties of the DOX-loaded LNPs were assessed in vitro.
  • Cellular uptake, intracellular accumulation, and cytotoxicity of DOX-loaded LNPs were compared to free DOX in both parental MCF-7 and P-gp-overexpressing MCF-7/ADR cells.

Main Results:

  • DOX-loaded LNPs demonstrated significantly increased nuclear accumulation in drug-resistant MCF-7/ADR cells compared to free DOX.
  • LNPs altered intracellular drug trafficking, effectively bypassing P-gp efflux mechanisms.
  • DOX-loaded LNPs exhibited a 30-fold lower IC(50) value than free DOX in MCF-7/ADR cells, indicating enhanced cytotoxicity due to nuclear retention.

Conclusions:

  • The developed core-shell LNP structure is a promising platform for overcoming P-gp-mediated multidrug resistance in cancer therapy.
  • LNPs facilitate enhanced drug delivery and retention in resistant cancer cells, leading to improved therapeutic efficacy.
  • This nanotechnology-based approach offers a potential strategy to circumvent a major challenge in current cancer chemotherapy.
Keywords:
chemotherapydrug deliverymultidrug resistancepolymeric nanoparticles

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