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Pristimerin induces caspase-dependent apoptosis in MDA-MB-231 cells via direct effects on mitochondria

Chin-Chung Wu1, Mei-Ling Chan, Wen-Ying Chen

  • 1Graduate Institute of Natural Products, Kaohsiung Medical University, 100 Shin-Chuan 1st Road, Kaohsiung, Taiwan. ccwu@kmu.edu.tw

Molecular Cancer Therapeutics
|August 12, 2005
PubMed

Insights

Pristimerin induces apoptosis in human breast cancer cells by directly targeting mitochondria, leading to cytochrome c release. This natural compound shows potential as a novel chemotherapeutic agent for cancer treatment.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Pristimerin, a natural triterpenoid, exhibits cytotoxicity against various cancer cell lines.
  • The precise mechanism underlying pristimerin's cytotoxic effects remains largely unexplored.

Purpose of the Study:

  • To elucidate the mechanism of pristimerin-induced cytotoxicity in human breast cancer cells.
  • To investigate pristimerin's effects on apoptosis and mitochondrial function.

Main Methods:

  • Human breast cancer MDA-MB-231 cells were treated with pristimerin.
  • Assays included caspase activation, DNA fragmentation, mitochondrial membrane potential, and cytochrome c release.
  • Involvement of Bcl-2 family proteins and reactive oxygen species was assessed.
  • Cell-free experiments with isolated mitochondria were performed.

Main Results:

  • Pristimerin rapidly induced apoptosis, evidenced by caspase activation and DNA fragmentation.
  • Mitochondrial cytochrome c release preceded caspase activation and was independent of Bcl-2 family proteins or reactive oxygen species.
  • Pristimerin directly induced cytochrome c release from isolated mitochondria.
  • Benzyloxycarbonyl-Val-Ala-Asp-fluoromethyl ketone (a pan-caspase inhibitor) blocked apoptosis, but not cytochrome c release.

Conclusions:

  • Pristimerin is a novel mitochondria-targeted compound.
  • Its mechanism involves direct induction of mitochondrial cytochrome c release, triggering apoptosis.
  • Pristimerin warrants further investigation as a potential chemotherapeutic agent for human cancers.

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