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Kaempferol promotes bone formation in part via the mTOR signaling pathway

  • Authors:
    • Jing Zhao
    • Jue Wu
    • Binwu Xu
    • Zhen Yuan
    • Yu Leng
    • Jun Min
    • Xiaoyong Lan
    • Jun Luo
  • View Affiliations / Copyright

    Affiliations: Department of Neurology, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330000, P.R. China, Laboratory of Translational Medicine, Chinese PLA General Hospital, Beijing 100853, P.R. China, Department of Orthopedics, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330000, P.R. China, Regeneration and Rehabilitation Engineering Research Institute on Bone and Nerve of Jiangxi, Nanchang, Jiangxi 330000, P.R. China , Department of Emergency, The First People's Hospital of Jiujiang City, Jiujiang, Jiangxi 332000, P.R. China, Department of Rehabilitation, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, P.R. China, Department of Orthopedics, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, P.R. China
    Copyright: © Zhao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 5197-5207
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    Published online on: October 16, 2019
       https://doi.org/10.3892/mmr.2019.10747
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Abstract

Previous research indicates that kaempferol (Kae) promotes osteogenesis, but its underlying mechanism of action remains unclear. The present study hypothesized that the osteogenic effects of Kae were mediated through mammalian target of rapamycin (mTOR). To validate this hypothesis, bone marrow mesenchymal stem cells (BMSCs) from ovariectomized (OVX) rats were differentiated into osteoblasts. The bone mineral density and bone microarchitecture of the OVX rats was measured in vivo, while osteogenesis was evaluated in vitro via Alizarin Red S staining and alkaline phosphatase activity measurements in cultured BMSCs. The levels of phosphorylated eukaryotic translation initiation factor 4E‑binding protein 1 (p‑4E/BP1) and phosphorylated ribosomal protein S6 kinase B1 (p‑S6K), and the expression of Runt‑related transcription factor 2 and Osterix, were concurrently quantified by western blot analysis. The data suggested that Kae prevented OVX‑induced osteoporosis in rats by promoting osteoblastogenesis. Furthermore, treatment with Kae in rat BMSCs enhanced mineralization, elevated ALP activity, increased the expression levels of Runx‑2 and Osterix and increased the levels of p‑S6K and decreased the levels of p‑4E/BP1 and, consistent with its ability to promote osteoblast differentiation. In contrast, treatment with rapamycin, an mTOR inhibitor, produced the opposite phenotype. Taken together, these data suggested that the protective effects of Kae in BMSCs and in the OVX rat model resulted from the induction of osteogenesis via mTOR signaling, or at least partially via the regulation of downstream effectors of the mTOR pathway.
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Copy and paste a formatted citation
Spandidos Publications style
Zhao J, Wu J, Xu B, Yuan Z, Leng Y, Min J, Lan X and Luo J: Kaempferol promotes bone formation in part via the mTOR signaling pathway. Mol Med Rep 20: 5197-5207, 2019.
APA
Zhao, J., Wu, J., Xu, B., Yuan, Z., Leng, Y., Min, J. ... Luo, J. (2019). Kaempferol promotes bone formation in part via the mTOR signaling pathway. Molecular Medicine Reports, 20, 5197-5207. https://doi.org/10.3892/mmr.2019.10747
MLA
Zhao, J., Wu, J., Xu, B., Yuan, Z., Leng, Y., Min, J., Lan, X., Luo, J."Kaempferol promotes bone formation in part via the mTOR signaling pathway". Molecular Medicine Reports 20.6 (2019): 5197-5207.
Chicago
Zhao, J., Wu, J., Xu, B., Yuan, Z., Leng, Y., Min, J., Lan, X., Luo, J."Kaempferol promotes bone formation in part via the mTOR signaling pathway". Molecular Medicine Reports 20, no. 6 (2019): 5197-5207. https://doi.org/10.3892/mmr.2019.10747
Copy and paste a formatted citation
x
Spandidos Publications style
Zhao J, Wu J, Xu B, Yuan Z, Leng Y, Min J, Lan X and Luo J: Kaempferol promotes bone formation in part via the mTOR signaling pathway. Mol Med Rep 20: 5197-5207, 2019.
APA
Zhao, J., Wu, J., Xu, B., Yuan, Z., Leng, Y., Min, J. ... Luo, J. (2019). Kaempferol promotes bone formation in part via the mTOR signaling pathway. Molecular Medicine Reports, 20, 5197-5207. https://doi.org/10.3892/mmr.2019.10747
MLA
Zhao, J., Wu, J., Xu, B., Yuan, Z., Leng, Y., Min, J., Lan, X., Luo, J."Kaempferol promotes bone formation in part via the mTOR signaling pathway". Molecular Medicine Reports 20.6 (2019): 5197-5207.
Chicago
Zhao, J., Wu, J., Xu, B., Yuan, Z., Leng, Y., Min, J., Lan, X., Luo, J."Kaempferol promotes bone formation in part via the mTOR signaling pathway". Molecular Medicine Reports 20, no. 6 (2019): 5197-5207. https://doi.org/10.3892/mmr.2019.10747
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