title: Kazinol Q from Broussonetia kazinoki enhances cell death induced by Cu(II) through increased reactive oxygen species.
abstract: The ability of the flavan kazinol Q (KQ) to induce DNA breakage in the presence of Cu(II) was examined by agarose gel electrophoresis using supercoiled plasmid DNA. In KQ-mediated DNA breakage reaction, the involvement of reactive oxygen species (ROS), H(2)O(2) and O(2)- was established by the inhibition of DNA breakage by catalase and revealed DNA breakage by superoxide dismutase (SOD). The cell viability of gastric carcinoma SCM-1 cells treated with various concentrations of KQ was significantly decreased by cotreatment with Cu(II). Treatment of SCM-1 cells with 300 μM Cu(II) enhanced the necrosis induced by 100 μM KQ. Treatment of SCM-1 cells with 100 mM KQ in the presence of 300 mM Cu(II) increased the generation of H(2)O(2). Taken together, the above finding suggested that KQ cotreatment with Cu(II) produced increased amounts of H(2)O(2), thus enhancing subsequent cell death due to necrosis.
authors.affiliation: Department of Life Science, National Taitung University, Taitung 950, Taiwan. blwei@nttu.edu.tw
authors.forename: Bai-Luh
authors.initials: BL
authors.lastname: Wei
authors.forename: Ying-Chieh
authors.initials: YC
authors.lastname: Chen
authors.forename: Hsue-Yin
authors.initials: HY
authors.lastname: Hsu
mesh_terms: D031623:Broussonetia / Q000737:chemistry*; D016923:Cell Death / Q000187:drug effects*; D045744:Cell Line, Tumor; D003300:Copper / Q000494:pharmacology*; D004249:DNA Damage; D005419:Flavonoids / Q000494:pharmacology*; D045782:Hemiterpenes / Q000494:pharmacology*; D006801:Humans; D010957:Plasmids; D017382:Reactive Oxygen Species / Q000378:metabolism*
chemical_list: D005419:Flavonoids; D045782:Hemiterpenes; D017382:Reactive Oxygen Species; C559379:kazinol Q; D003300:Copper