Anticancer effect of cucurbitacin B on MKN-45 cells via inhibition of the JAK2/STAT3 signaling pathway

  • Authors:
    • You‑Li Xie
    • Wen‑Hui Tao
    • Ti‑Xiong Yang
    • Jian‑Guo Qiao
  • View Affiliations

  • Published online on: September 6, 2016     https://doi.org/10.3892/etm.2016.3670
  • Pages: 2709-2715
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Abstract

The aim of the present study was to investigate the effect of cucurbitacin B on MKN‑45 gastric carcinoma cells. Cell proliferation was determined using a cell counting kit‑8 assay, and commercial cell cycle and apoptosis analysis kits were used to determine the cell cycle by flow cytometry. The mRNA expression of genes which mediate cell cycle checkpoints and apoptosis was detected using reverse transcription‑quantitative polymerase chain reaction, and a terminal deoxynucleotidyl transferase dUTP nick end labeling assay was used to determine apoptosis rate. Western blot analysis was used to detect the protein expression levels of JAK2/STAT3 signaling pathway‑associated proteins. The presented data show that cucurbitacin B significantly inhibited the proliferation of MKN‑45 cells in a dose‑ and time‑dependent manner. In accordance with these findings, cucurbitacin B blocked the progression of the cell cycle from G0/G1 to S phase, which was confirmed by the mRNA expression analysis. Cucurbitacin B treatment significantly suppressed the expression of cyclin D1, cyclin E, cyclin‑dependent kinase 4 (CDK4) and CDK2, while increasing the expression of p27. Cucurbitacin B also promoted cell apoptosis, as was determined by TUNEL assay and evaluation of mRNA expression. Further experiments suggested that the beneficial effect of cucurbitacin B on blocking the proliferation and inducing the apoptosis of MKN‑45 cells may have been associated with suppression of the JAK2/STAT3 signaling pathway. Thus, the present results indicate that cucurbitacin B suppresses proliferation and promoted apoptosis of MKN‑45 cells, which may be mediated by inhibition of the JAK2/STAT3 signaling pathway. Cucurbitacin B therefore may warrant further investigation as a feasible therapy for gastric carcinoma.
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October-2016
Volume 12 Issue 4

Print ISSN: 1792-0981
Online ISSN:1792-1015

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Spandidos Publications style
Xie YL, Tao WH, Yang TX and Qiao JG: Anticancer effect of cucurbitacin B on MKN-45 cells via inhibition of the JAK2/STAT3 signaling pathway. Exp Ther Med 12: 2709-2715, 2016.
APA
Xie, Y., Tao, W., Yang, T., & Qiao, J. (2016). Anticancer effect of cucurbitacin B on MKN-45 cells via inhibition of the JAK2/STAT3 signaling pathway. Experimental and Therapeutic Medicine, 12, 2709-2715. https://doi.org/10.3892/etm.2016.3670
MLA
Xie, Y., Tao, W., Yang, T., Qiao, J."Anticancer effect of cucurbitacin B on MKN-45 cells via inhibition of the JAK2/STAT3 signaling pathway". Experimental and Therapeutic Medicine 12.4 (2016): 2709-2715.
Chicago
Xie, Y., Tao, W., Yang, T., Qiao, J."Anticancer effect of cucurbitacin B on MKN-45 cells via inhibition of the JAK2/STAT3 signaling pathway". Experimental and Therapeutic Medicine 12, no. 4 (2016): 2709-2715. https://doi.org/10.3892/etm.2016.3670