Kaempferol suppresses cell metastasis via inhibition of the ERK-p38-JNK and AP-1 signaling pathways in U-2 OS human osteosarcoma cells

  • Authors:
    • Hui-Jye Chen
    • Chung-Ming Lin
    • Chao-Ying Lee
    • Nai-Chen Shih
    • Shu-Fen Peng
    • Minoru Tsuzuki
    • Sakae Amagaya
    • Wen-Wen Huang
    • Jai-Sing Yang
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  • Published online on: May 23, 2013     https://doi.org/10.3892/or.2013.2490
  • Pages: 925-932
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Abstract

Kaempferol is a natural flavonoid that possesses anti-proliferative and apoptosis-inducing activities in several cancer cell lines. In the present study, we investigated the anti-metastatic activity of kaempferol and its molecular mechanism(s) of action in human osteosarcoma cells. Kaempferol displayed inhibitory effects on the invasion and adhesion of U-2 osteosarcoma (OS) cells in a concentration-dependent manner by Matrigel Transwell assay and cell adhesion assay. Kaempferol also inhibited the migration of U-2 OS cells in a concentration-dependent manner at different treatment time points by wound-healing assay. Additional experiments showed that kaempferol treatment reduced the enzymatic activities and protein levels of matrix metalloproteinase (MMP)-2, MMP-9 and urokinase plasminogen activator (uPA) by gelatin and casein-plasminogen zymography assays and western blot analyses. Kaempferol also downregulated the mRNA levels of MMP-2 and MMP-9 by quantitative PCR analyses. Furthermore, kaempferol was able to reduce the protein phosphorylation of ERK, p38 and JNK by western blotting. By electrophoretic mobility-shift assay (EMSA), we demonstrated that kaempferol decreased the DNA binding activity of AP-1, an action likely to result in the reduced expression of MMP-2, MMP-9 and uPA. Collectively, our data showed that kaempferol attenuated the MAPK signaling pathways including ERK, JNK and p38 and resulted in the decreased DNA binding ability of AP-1, and hence, the downregulation in the expression and enzymatic activities of MMP-2, MMP-9 and uPA, contributing to the inhibition of metastasis of U-2 OS cells. Our results suggest a potential role of kaempferol in the therapy of tumor metastasis of OS.
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August 2013
Volume 30 Issue 2

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Chen H, Lin C, Lee C, Shih N, Peng S, Tsuzuki M, Amagaya S, Huang W and Yang J: Kaempferol suppresses cell metastasis via inhibition of the ERK-p38-JNK and AP-1 signaling pathways in U-2 OS human osteosarcoma cells. Oncol Rep 30: 925-932, 2013
APA
Chen, H., Lin, C., Lee, C., Shih, N., Peng, S., Tsuzuki, M. ... Yang, J. (2013). Kaempferol suppresses cell metastasis via inhibition of the ERK-p38-JNK and AP-1 signaling pathways in U-2 OS human osteosarcoma cells. Oncology Reports, 30, 925-932. https://doi.org/10.3892/or.2013.2490
MLA
Chen, H., Lin, C., Lee, C., Shih, N., Peng, S., Tsuzuki, M., Amagaya, S., Huang, W., Yang, J."Kaempferol suppresses cell metastasis via inhibition of the ERK-p38-JNK and AP-1 signaling pathways in U-2 OS human osteosarcoma cells". Oncology Reports 30.2 (2013): 925-932.
Chicago
Chen, H., Lin, C., Lee, C., Shih, N., Peng, S., Tsuzuki, M., Amagaya, S., Huang, W., Yang, J."Kaempferol suppresses cell metastasis via inhibition of the ERK-p38-JNK and AP-1 signaling pathways in U-2 OS human osteosarcoma cells". Oncology Reports 30, no. 2 (2013): 925-932. https://doi.org/10.3892/or.2013.2490