Screening the active constituents of Chinese medicinal herbs as potent inhibitors of Cdc25 tyrosine phosphatase, an activator of the mitosis-inducing p34cdc2 kinase |
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| Authors: | Yang Hua Zheng Shu Meijer Laurent Li Shi-min Leclerc Sophie Yu Lin-lin Cheng Jin-quan Zhang Su-zhan |
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| Institution: | Cancer Institute, Zhejiang University, Hangzhou, China. YangH@moffitt.usf.edu |
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| Abstract: | Objective: To screen and evaluate the active constituents of Chinese medicinal herbs as potent inhibitors of Cdc25phosphatase. Methods: The affinity chromatography purified glutashione-S-transferase/Cdc25A phosphatase fusion protein and Cdc2/cyclin B from the extracts of starfish M phase oocytes are used as the cell cycle-specific targets for screening the antimitotic constituents. We tested 9 extracts isolated from the Chinese medicinal herbs and vegetables including the agents currently used in cancer treatment by measuring the inhibition of Cdc25A phosphatase and Cdc2 kinase activity. The antitumor activity of the extracts was also evaluated by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay and flow cytometry.Results: Cdc25A inhibitory activity and antitumor activity are detected in the extracts isolated from three Chinese medicinal herbs Agrimonapilosa; Herba solani lyrati; Galla chinesis. Conclusion: We found three extracts isolated from Chinese medicinal herbs have potential inhibitory activity of Cdc25 phosphatase using a highly specific mechanism-based screen assay for antimitotic drug discovery. |
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| Keywords: | Chinese medicinal herbs Cdc25 phosphatase inhibition Cell cycle Anti-tumor activity |
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