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Down-regulation of P-glycoprotein expression in MDR breast cancer cell MCF-7/ADR by honokiol

Dong Xu1, Qinghua Lu, Xun Hu

  • 1Cancer Institute, The Second Affiliated Hospital, The Medical School, Zhejiang University, 88 Jiefang Road, Hangzhou, Zhejiang Province 310009, People's Republic of China.

Cancer Letters
|January 13, 2006
PubMed

Insights

Honokiol, a natural compound, reduces P-glycoprotein expression in multidrug-resistant breast cancer cells. This finding offers a new strategy to overcome cancer drug resistance and enhance treatment effectiveness.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Oncology

Background:

  • P-glycoprotein mediates multidrug resistance (MDR) in various cancers.
  • Inhibiting P-glycoprotein is a key strategy to reverse cancer drug resistance.
  • Honokiol exhibits anti-cancer properties, including anti-angiogenesis and apoptosis induction.

Purpose of the Study:

  • To investigate the effect of honokiol on P-glycoprotein expression in multidrug-resistant breast cancer cells.
  • To determine if honokiol can reverse adriamycin resistance in MCF-7/ADR cells.

Main Methods:

  • MCF-7/ADR human breast cancer cells were treated with honokiol.
  • P-glycoprotein expression was analyzed at both mRNA and protein levels.
  • Intracellular adriamycin accumulation and cell sensitivity were measured.

Main Results:

  • Honokiol significantly down-regulated P-glycoprotein expression at mRNA and protein levels.
  • This down-regulation led to a partial restoration of intracellular adriamycin accumulation.
  • Sensitivity to adriamycin was partially recovered in honokiol-treated cells.

Conclusions:

  • Honokiol effectively reduces P-glycoprotein expression in multidrug-resistant breast cancer.
  • Honokiol demonstrates potential as an agent to overcome cancer multidrug resistance.
  • This study uncovers a novel anti-cancer function of honokiol in reversing drug resistance.

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