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Published on: February 15, 2016

Overcoming multidrug resistance in human lung cancer with novel benzo[a]quinolizin-4-ones

Yodsoi Kanintronkul1, Rattana Worayuthakarn, Nopporn Thasana

  • 1Chulabhorn Research Institute, Thailand.

Anticancer Research
|April 19, 2011
PubMed
Abstract

Insights

Synthetic benzo[a]quinolizin-4-one compounds effectively reverse multidrug resistance (MDR) in lung cancer cells. These compounds increase intracellular drug accumulation, overcoming etoposide resistance without affecting P-glycoprotein levels.

Area of Science:

  • Medicinal Chemistry
  • Cancer Biology
  • Pharmacology

Background:

  • Lung cancer cells can develop multidrug resistance (MDR), limiting treatment efficacy.
  • Etoposide resistance in A549RT-eto cells is associated with elevated MDR1 gene and P-glycoprotein (P-gp) expression.
  • Understanding mechanisms to overcome MDR is crucial for improving lung cancer therapy.

Purpose of the Study:

  • To synthesize and evaluate benzo[a]quinolizin-4-one derivatives for their potential to reverse MDR in lung cancer.
  • To investigate the mechanism by which these compounds modulate drug resistance.

Main Methods:

  • Established a multidrug-resistant lung cancer cell line (A549RT-eto) via etoposide exposure.
  • Assessed cytotoxic activity using the MTT assay.
  • Investigated drug resistance mechanisms through real-time PCR, Western blot, and flow cytometry.

Main Results:

  • A549RT-eto cells exhibited a 28-fold higher etoposide IC(50) compared to parental cells, linked to increased MDR1 and P-gp.
  • Three synthesized benzo[a]quinolizin-4-one derivatives significantly reduced the etoposide IC(50) in resistant cells.
  • These derivatives enhanced intracellular drug accumulation without altering P-gp expression at the transcriptional or translational levels.

Conclusions:

  • Benzo[a]quinolizin-4-one derivatives can effectively reverse etoposide-induced multidrug resistance in lung cancer cells.
  • The mechanism involves increasing intracellular drug accumulation, not by affecting P-gp expression.
  • These compounds show promise as adjuncts to chemotherapy in treating drug-resistant lung cancer.

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