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Enhancing perifosine's anticancer efficacy by preventing autophagy

Shi-Yong Sun1

  • 1Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA, USA. ssun@emory.edu

Autophagy
|December 22, 2009
PubMed

Insights

Perifosine, an anticancer drug, inhibits cancer growth by degrading mTOR signaling components, leading to autophagy and apoptosis. Combining perifosine with lysosomal inhibitors enhances its efficacy by blocking protective autophagy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Perifosine is an alkylphospholipid with demonstrated antitumor activity.
  • Its mechanism involves Akt inhibition, but further understanding is needed.
  • Current research explores its effects on mTOR signaling and cell death pathways.

Purpose of the Study:

  • To elucidate the anticancer mechanism of perifosine.
  • To investigate perifosine's interaction with mTOR signaling pathway.
  • To explore the role of autophagy in perifosine's efficacy.

Main Methods:

  • Investigated perifosine's effect on mTOR components (mTOR, raptor, rictor) degradation.
  • Assessed induction of autophagy and apoptosis by perifosine.
  • Evaluated combination therapy of perifosine with a lysosomal inhibitor in xenograft models.

Main Results:

  • Perifosine inhibits mTOR signaling by facilitating the degradation of key mTOR axis components, distinct from rapamycin.
  • Perifosine significantly induces both autophagy and apoptosis.
  • Combination of perifosine with a lysosomal inhibitor enhanced apoptosis and suppressed tumor growth in vivo.
  • Perifosine-induced autophagy appears to protect cancer cells from apoptosis.

Conclusions:

  • Perifosine exhibits anticancer activity through a novel mechanism of degradation-mediated mTOR inhibition.
  • Autophagy induced by perifosine may confer resistance to apoptosis.
  • Inhibiting autophagy could be a viable strategy to potentiate perifosine's therapeutic efficacy in cancer treatment.

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