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The anti-tumor activity of Mikania micrantha aqueous extract in vitro and in vivo

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Abstract

Aqueous extract obtained from Mikania micrantha (MMAE) is commonly used as traditional medicine in some countries. We hypothesized that MMAE may inhibit tumor cell growth, both in an in vitro and in vivo setting. In in vitro experiments, two kinds of human cancer cell lines, K562 and Hela were used to test the anti-tumor activity. Inhibitory concentrations (IC50) were obtained from the inhibition curves fitted by regression analysis, inhibitory rates (%) were calculated by MTT assay, morphological changes were observed by transmission electron microscope (TEM), cell cycles were analyzed by flow cytometry (FCM), and DNA ladders were determined by agarose gel electrophoresis. The in vivo anti-tumor activity was evaluated by calculating the tumor inhibitory rates, thymus index and spleen index of S180-bearing mice. Paraffin-embedded sections were used to test the pathologic changes. The result displayed that the growth of K562 and Hela were enhanced when treated with MMAE at 20 μg/mL after 48 h. Other concentrations of MMAE (50, 100, 200, 400 μg/mL) inhibited the proliferation of both kinds of cells. The IC50 values of K562 and Hela at 48 h were 167.16 and 196.27 μg/mL and at 72 h 98.07 and 131.56 μg/mL, respectively. The effects showed time-dose dependence. MMAE led to damages of organelles and induced apoptosis. These results were confirmed by ladder DNA fragmentation profile. MMAE also increased the percentage of cells in G2/M phase and decreased the percentage of cells undergoing G0/G1 and S phase in in vivo tests using S180 cells. MMAE showed antitummor activity in vivo, with its tumor inhibitory rate ranging from 12.1 to 46.9 %. MMAE also induced necrosis, as shown by pathological examination of Hematoxilin-Eosin stained tumor sections. Meanwhile, compared with the control group, the changes of thymus index and spleen index in MMAE treated group were not obvious. This study suggests that MMAE may be an effective agent for cancer therapy with low toxicity.

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Authors and Affiliations

  1. Faculty of Agriculture and Forestry, Tibet Vocational Technical Collage, Lhasa, 850030, China

    Xiaoju Dou

  2. Shenzhen Pass Environmental Testing and Technology Co.Ltd, Shenzhen, 518030, China

    Ning Sun

  3. College of Life Sciences, Shenzhen Key Laboratory of Microbial Genetic Engineering, Shenzhen University, Shenzhen, 518060, China

    Yu Zhang & Li Li

  4. College of Life Sciences, Shenzhen Key Laboratory of Marine Bio-Resources and Ecology, Shenzhen University, Shenzhen, 518060, China

    Yuhe Wu

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  1. Xiaoju Dou
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  2. Yu Zhang
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  3. Ning Sun
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  4. Yuhe Wu
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  5. Li Li
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Correspondence to Yuhe Wu or Li Li.

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Dou, X., Zhang, Y., Sun, N. et al. The anti-tumor activity of Mikania micrantha aqueous extract in vitro and in vivo. Cytotechnology 66, 107–117 (2014). https://doi.org/10.1007/s10616-013-9543-9

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