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Cancer Cell Mitochondria Targeting by Pancratistatin Analogs is Dependent on Functional Complex II and III

Dennis Ma1, Christopher Pignanelli1, Daniel Tarade1

  • 1Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada.

Scientific Reports
|February 22, 2017
PubMed

Insights

New pancratistatin analogs show potent anti-cancer activity by disrupting mitochondrial function and inducing apoptosis. These compounds offer therapeutic potential by exploiting cancer cell metabolic vulnerabilities.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Cancer cells exhibit enhanced mitochondrial stability and reduced reliance on oxidative phosphorylation, conferring resistance to apoptosis.
  • Pancratistatin (PST) selectively induces apoptosis in cancer cells but suffers from low natural availability.
  • Developing synthetic analogs is crucial for advancing PST's therapeutic potential.

Purpose of the Study:

  • To synthesize and screen novel pancratistatin (PST) analogs for enhanced anti-cancer activity.
  • To investigate the mechanism of action of potent PST analogs, focusing on mitochondrial function and apoptosis.
  • To identify lead compounds with therapeutic potential for cancer treatment.

Main Methods:

  • Synthesis of PST analogs.
  • Medium-throughput screening of synthesized compounds against cancer cells.
  • Assessment of mitochondrial function and apoptosis induction.
  • Evaluation of tumor xenograft growth inhibition in vivo.
  • Analysis of effects upon inhibition of mitochondrial complex II and III.

Main Results:

  • Analogs SVTH-7, -6, and -5 exhibited superior anti-cancer activity compared to PST and standard chemotherapeutics.
  • These analogs effectively disrupted mitochondrial function and activated the intrinsic apoptotic pathway.
  • SVTH-7 demonstrated significant reduction in tumor xenograft growth in vivo.
  • Pro-apoptotic effects of SVTH-7 were dependent on mitochondrial complex II and III activity.

Conclusions:

  • Novel PST analogs possess potent anti-cancer properties and can overcome apoptosis resistance in cancer cells.
  • The anti-cancer effects are mediated through disruption of mitochondrial function and activation of apoptosis.
  • Mitochondrial and metabolic vulnerabilities in cancer cells can be targeted therapeutically.
  • SVTH-7 and related analogs represent promising lead compounds for cancer therapy development.

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