ginsenoside rh2 inhibiting hct116 colon cancer cell proliferation through blocking pdz-binding kinase/t-lak cell-originated protein kinase

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ID: 169195
2016
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Abstract
Background: Ginsenoside Rh2 (GRh2) is the main bioactive component in American ginseng, a commonly used herb, and its antitumor activity had been studied in previous studies. PDZ-binding kinase/T-LAK cell-originated protein kinase (PBK/TOPK), a serine/threonine protein kinase, is highly expressed in HCT116 colorectal cancer cells. Methods: We examined the effect of GRh2 on HCT116 cells ex vivo. Next, we performed in vitro binding assay and in vitro kinase assay to search for the target of GRh2. Furthermore, we elucidated the underlying molecular mechanisms for the antitumor effect of GRh2 ex vivo and in vivo. Results: The results of our in vitro studies indicated that GRh2 can directly bind with PBK/TOPK and GRh2 also can directly inhibit PBK/TOPK activity. Ex vivo studies showed that GRh2 significantly induced cell death in HCT116 colorectal cancer cells. Further mechanistic study demonstrated that these compounds inhibited the phosphorylation levels of the extracellular regulated protein kinases 1/2 (ERK1/2) and (H3) in HCT116 colorectal cancer cells. In vivo studies showed GRh2 inhibited the growth of xenograft tumors of HCT116 cells and inhibited the phosphorylation levels of the extracellular regulated protein kinases 1/2 and histone H3. Conclusion: The results indicate that GRh2 exerts promising antitumor effect that is specific to human HCT116 colorectal cancer cells through inhibiting the activity of PBK/TOPK.
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Authors ;Jianjun Yang;Donghong Yuan;Tongchao Xing;Hongli Su;Shengjun Zhang;Jiansheng Wen;Qiqiang Bai;Dongmei Dang
Journal advances in high energy physics
Year 2016
DOI
10.1016/j.jgr.2016.03.007
URL
http://www.sciencedirect.com/science/article/pii/S1226845316300331
Keywords
apoptosis

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