Toxicological Research

Korean Society of Toxicology & Korea Environmental Mutagen Society (한국독성학회)
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Requirement of Reactive Oxygen Species Generation in Apoptosis of MCF-7 Human Breast Carcinoma Cells Induced by Sanguinarine

  • Lim, Ji-Young (Korea Science Academy) ;
  • Lee, Yae-Lim (Korea Science Academy) ;
  • Lee, Hae-Rin (Korea Science Academy) ;
  • Choi, Woo-Young (Department of Biology, Pusan National University) ;
  • Lee, Won-Ho (Department of Biology, Pusan National University) ;
  • Choi, Yung-Hyun (Department of Biochemistry, Dongeui University College of Oriental Medicine and Department of Biomaterial Control, Dongeui University Graduate School)
  • Published : 2007.09.30
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Abstract

Although sanguinarine, a benzophenanthridine alkaloid, possesses anti-cancer properties against several cancer cell lines, the molecular mechanisms by which it inhibits cell growth and induces apoptosis have not been clearly understood. In order to further explore the critical events leading to apoptosis in sanguinarine-treated MCF-7 human breast carcinoma cells, the following effects of sanguinarine on components of the mitochondrial apoptotic pathway were examined: generation of reactive oxygen species (ROS), alteration of the mitochondrial membrane potential (MMP), and the expression changes of Bcl-2 family proteins. We show that sanguinarine-induced apoptosis is accompanied by the generation of intracellular ROS and disruption of MMP as well as an increase in pro-apoptotic Bax expression and a decrease of anti-apoptotic Bcl-2 and Bcl-xL expression. The quenching of ROS generation with N-acetyl-L-cysteine, the ROS scavenger, protected the sanguinarine-elicited ROS generation, mitochondrial dysfunction, modulation of Bcl-2 family proteins, and apoptosis. Based on these results, we propose that the cellular ROS generation plays a pivotal role in the initiation of sanguinarine-triggered apoptotic death.

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References

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