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Molecular mechanisms of drug resistance in single-step and multi-step drug-selected cancer cells

Anna Maria Calcagno1, Suresh V Ambudkar

  • 1Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, NIH, DHHS, Bethesda, MD, USA.

Methods in Molecular Biology (Clifton, N.J.)
|December 2, 2009
PubMed

Insights

Multidrug resistance (MDR) in cancer is often caused by ATP-binding cassette (ABC) transporters. This study examines cell models to understand how MDR develops through drug selection methods.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Multidrug resistance (MDR) significantly impacts cancer chemotherapy outcomes.
  • Overexpression of ATP-binding cassette (ABC) transporters is a primary mechanism driving acquired MDR.
  • In vitro cell culture models are crucial for investigating MDR mechanisms.

Purpose of the Study:

  • To examine multi-step and single-step drug-selected cell lines.
  • To elucidate the mechanisms underlying the development of MDR in cancer cells.
  • To understand the role of ABC transporters in MDR.

Main Methods:

  • Generation of MDR sublines using multi-step drug selection.
  • Generation of MDR sublines using single-step drug selection.
  • Analysis of gene overexpression and transporter identification.

Main Results:

  • Multi-step selections identified key drug transporters like ABCB1, ABCC1, and ABCG2.
  • Various mechanisms contributing to gene overexpression in MDR were elucidated.
  • Single-step selections provided models that more closely mimic in vivo conditions.

Conclusions:

  • Drug selection strategies in cell culture are vital for understanding MDR.
  • Investigating selected cell lines aids in discovering MDR mechanisms and transporters.
  • These models are essential for developing strategies to overcome chemotherapy resistance.

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