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Pyrvinium targets autophagy addiction to promote cancer cell death

Longfei Deng1, Yunlong Lei, Rui Liu

  • 1The State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, China.

Cell Death & Disease
|May 4, 2013
PubMed

Insights

Pyrvinium pamoate, an antihelminthic drug, inhibits cancer cell autophagy by reducing gene expression. Combining pyrvinium with autophagy stimuli enhances its anticancer effects, suggesting a new therapeutic strategy targeting autophagy addiction.

Area of Science:

  • Cell Biology
  • Oncology
  • Pharmacology

Background:

  • Autophagy is a cellular process crucial for cancer cell survival under stress.
  • Pyrvinium pamoate, an antihelminthic, shows potential anticancer activity.
  • Understanding pyrvinium's mechanism is key to developing new cancer therapies.

Purpose of the Study:

  • To investigate the effect of pyrvinium pamoate on autophagy in cancer cells.
  • To elucidate the mechanism by which pyrvinium inhibits autophagy.
  • To evaluate the therapeutic potential of combining pyrvinium with autophagy-modulating agents.

Main Methods:

  • In vitro and in vivo studies using cancer cell lines.
  • Analysis of autophagy gene expression and mammalian target of rapamycin (mTOR) pathway.
  • Combination therapy studies with autophagy inducers like 2-deoxy-D-glucose (2-DG) and inhibitors like 3-MA.

Main Results:

  • Pyrvinium pamoate effectively inhibits autophagy in cancer cells, independent of mTOR.
  • Inhibition of autophagy by pyrvinium occurs via transcriptional downregulation of autophagy genes.
  • Combination of pyrvinium with autophagy stimuli (e.g., 2-DG) significantly enhances cancer cell toxicity and inhibits tumor growth in vivo.
  • Evidence suggests cancer cells can become addicted to autophagy, making them vulnerable to pyrvinium.

Conclusions:

  • Pyrvinium pamoate is a potent autophagy inhibitor with anticancer properties.
  • Targeting autophagy addiction with pyrvinium offers a novel therapeutic strategy.
  • Combination therapy of pyrvinium with other anticancer agents or autophagy inducers may improve treatment efficacy.

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