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Growth inhibition and apoptosis induction by tanshinone I in human colon cancer Colo 205 cells

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Tanshinone I (Tan-I) and tanshinone IIA (Tan-IIA) were isolated from Danshen (Salviae Miltiorrhizae Radix), a widely prescribed traditional herbal medicine that is used to treat cardiovascular and dysmenorrhea diseases. In our previous study, Tan-IIA was demonstrated to induce apoptosis in human colon cancer Colo 205 cells. However, the effect of Tan-I on human colon cancer cells is not clearly understood yet. In this study, the anti-growth and apoptosis-eliciting effects of Tan-I, as well as its cellular mechanisms of actions, were investigated in Colo 205 human colon cancer cells. Tan-I reduced cell growth in a concentration-dependent manner, inducing apoptosis accompanied by an increase in TUNEL staining and in cells in the sub-G1 fraction. The expression of p53, p21, bax and caspase-3 increased in Tan-I-treated cells. In addition, the cell cycle analysis showed G0/G1 arrest. These findings suggest that Tan-I induces apoptosis in Colo 205 cells through both mitochondrial-mediated intrinsic cell-death pathways and p21-mediated G0/G1cell cycle arrest. Accordingly, the therapeutic potential of Tan-I for colon cancer deserves further study.
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Document Type: Research Article

Affiliations: Buddhist Tzu Chi General Hospital, Hualien, Division of General Surgery, Hualien 970, Taiwan, R.O.C., Email: [email protected]

Publication date: November 1, 2008

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  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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