Arsenic trioxide-induced apoptosis through oxidative stress in cells of colon cancer cell lines

Yoshihito Nakagawa, Yukihiro Akao, Hiroshi Morikawa, Ichiro Hirata, Kenichi Katsu, Tomoki Naoe, Nobuko Ohishi, Kunio Yagi

研究成果: Article査読

93 被引用数 (Scopus)


Exposure of three colon cancer cell lines, SW480, DLD-1, and COLO201, to arsenic trioxide in the medium induced a marked concentration-dependent suppression of cell growth. The intracellular contents of reduced glutathione (GSH) in these cell lines tended to be inversely correlated with the sensitivity of the cells to arsenic trioxide. Among the cell lines, SW480 cells underwent apoptosis at the low arsenic trioxide concentration of 2 μM, which was prevented by pretreatment of the cells with N-acetylcysteine and was enhanced by buthionine sulfoximine. The production of reactive oxygen intermediates which were examined by 2′,7′-dichlorodihydrofluorescein diacetate (H2DCF-DA), increased with time after treatment with arsenic trioxide. The apoptosis was executed by the activation of caspase 3, which was shown by Western blot, enzymatic activity, and apoptosis inhibition assay. The mitochondrial membrane potential of adherent apoptotic SW480 cells and the cells from intermediate layer separated by density gradient centrifugation, both of which showed the active form of caspase 3 by Western blot analysis, was not lost. The overexpression of Bcl-2 protein in SW480 cells could not prevent the apoptosis induced by the treatment with arsenic trioxide. All these findings indicate that arsenic trioxide-induced apoptosis in SW480 cells is executed by the activation of caspase 3 without mediating by mitochondria under the overproduction of reactive oxygen species.

ジャーナルLife Sciences
出版ステータスPublished - 29-03-2002

All Science Journal Classification (ASJC) codes

  • 生化学、遺伝学、分子生物学(全般)
  • 薬理学、毒性学および薬学(全般)


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