Chinese Journal of Tissue Engineering Research ›› 2014, Vol. 18 ›› Issue (33): 5293-5298.doi: 10.3969/j.issn.2095-4344.2014.33.008

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Bisphosphonate effects on capthesin K and bone resorption function during osteoclast differentiation  

Dong Wei, Feng Xiao-jie, Liang Yong-qiang, Peng Hong-feng, Deng Jiu-peng, Wen Li-ming, Qi Meng-chun   

  1. School of Stomatology, Hebei United University, Tangshan 063000, Hebei Province, China
  • Online:2014-08-13 Published:2014-08-13
  • Contact: Qi Meng-chun, M.D., Professor, Master’s supervisor, School of Stomatology, Hebei United University, Tangshan 063000, Hebei Province, China
  • About author:Dong Wei, Master, Lecturer, School of Stomatology, Hebei United University, Tangshan 063000, Hebei Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81270965; the Medical Research Plan of Hebei Province in 2013, No. 20130056

Abstract:

BACKGROUND: Studies have shown that bisphosphonates inhibit osteoclast resorption, but whether cathepsin K, a key cytokine of bone resorption, plays an effect has rarely been reported.
OBJECTIVE: To study the effect of bisphosphonate on capthesin K and bone resorption function during osteoclast differentiation.
METHODS: Osteoclasts were cultured by mouse monocyte-macrophage cell line-RAW264.7. The cells were divided into two groups: control group, treated with 100 μg/L receptor activator of nuclear factor κB ligand factor; alendronate group, treated with 100 μg/L receptor activator of nuclear factor κB ligand factor+10-7 mol/L alendronate. Osteoclastogenesis and resorption function of osteoclasts were examined at 7 days of culture and gene expression of capthesin K was detected by immunofluorescence method at 72 hours of culture. Western blot assay was used to detect capthesin K protein expression at 72 hours of culture.
RESULTS AND CONCLUSION: Tartrate-resistant acid phosphatase positive multinuclear cells were observed and resorption lacunae formed in two groups. Control group showed the higher number of tartrate-resistant acid phosphatase positive multinuclear cells and larger size of resorption lacunae than the alendronate group (P < 0.01). Immunofluorescence showed expression of capthesin K was higher in the control group than the 
alendronate group (P < 0.01); furthermore, the protein expression of capthesin K was also lower in the alendronate group than the control group (P < 0.01). These findings indicate that bisphosphonates could strongly inhibit osteoclastogenesis and its resorption function by inhibiting gene expression of capthesin K.



中国组织工程研究
杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程


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Key words: tissue engineering, diphosphonates, osteoclasts, osteoporosis

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