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A novel microtubule-modulating agent induces mitochondrially driven caspase-dependent apoptosis via mitotic

Ritu Aneja1, Tohru Miyagi, Prasanthi Karna

  • 1Department of Biology, Georgia State University, Atlanta, GA 30303, USA. raneja@gsu.edu

European Journal of Cancer (Oxford, England : 1990)
|March 23, 2010
PubMed

Insights

The novel compound EM011, a noscapine analogue, effectively inhibited hormone-refractory prostate cancer bone metastasis in mice. EM011 induced cancer cell death by disrupting cell division and activating apoptosis, with no observed toxicity in normal tissues.

Area of Science:

  • Oncology
  • Pharmacology
  • Molecular Biology

Background:

  • Hormone-refractory prostate cancer with skeletal metastasis presents significant therapeutic challenges.
  • Existing treatments often have limited efficacy and considerable side effects.

Purpose of the Study:

  • To evaluate the efficacy of EM011, a novel brominated analogue of noscapine, against hormone-refractory prostate cancer.
  • To elucidate the mechanism of action of EM011 in prostate cancer cells.

Main Methods:

  • Treatment of intratibially implanted human prostate cancer in nude mice with EM011.
  • Non-invasive, real-time bioluminescent imaging to monitor tumor growth.
  • In vitro studies using human prostate cancer cell lines to assess antiproliferative and proapoptotic effects.
  • siRNA-mediated attenuation of the mitotic checkpoint.
  • Analysis of apoptotic pathways, including mitochondrial and caspase activation.

Main Results:

  • EM011 significantly inhibited hormone-refractory prostate cancer growth in bone.
  • EM011 induced G2/M cell-cycle arrest by impairing spindle apparatus formation, activating the mitotic checkpoint.
  • Mitotic checkpoint activation was crucial for EM011-induced apoptosis.
  • EM011 triggered an intrinsic, mitochondrially mediated apoptotic pathway involving caspase activation.
  • No detectable toxicity was observed in normal tissues with rapidly dividing cells.

Conclusions:

  • EM011 demonstrates potent anticancer activity against hormone-refractory prostate cancer with skeletal metastasis.
  • The compound's mechanism involves cell-cycle blockade and induction of apoptosis via mitochondrial and caspase pathways.
  • EM011 exhibits a favorable safety profile, warranting further clinical investigation for prostate cancer management.

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