基础医学与临床 ›› 2017, Vol. 37 ›› Issue (1): 25-31.

• 研究论文 • 上一篇    下一篇

LPS激活TLR4抑制BMP9诱导iMEFs成骨分化

郭杨柳1,陈思成2,李亚1,范梦恬1,孙艳婷1,李汪1,施琼1   

  1. 1. 重庆医科大学临床检验诊断学教育部重点实验室
    2. 新乡医学院
  • 收稿日期:2016-08-25 修回日期:2016-09-23 出版日期:2017-01-05 发布日期:2016-12-30
  • 通讯作者: 施琼 E-mail:anniesq878@aliyun.com
  • 基金资助:
    国家自然科学基金面上项目;教育部博士点基金;重庆市教育委员会科学技术研究项目;重庆市渝中区科委基金

TLR4 activation with LPS inhibits BMP9-induced osteogenic differentiation of immortalized mouse embryonic fibroblasts

  • Received:2016-08-25 Revised:2016-09-23 Online:2017-01-05 Published:2016-12-30
  • Supported by:
    the National Natural Science Foundation of China

摘要: 目的 研究脂多糖( lipopolysaccharide,LPS)激活的Toll样受体4(Toll-like receptor 4,TLR4)信号对骨形态发生蛋白9(bone morphogenetic proteins 9,BMP9)诱导永生化小鼠胚胎成纤维细胞(immortalized mouse embryonic fibroblasts,iMEFs)成骨分化的影响。方法 细胞免疫荧光检测TLR4/NF-κB信号通路的激活;LPS,BAY11-7082和BMP9处理iMEFs,ALP染色和活性检测iMEFs早期成骨分化能力;茜素红S染色检测晚期成骨分化能力;半定量PCR和Western blot检测晚期成骨基因OCN和OPN表达;Western blot 检测Smad1/5/8磷酸化水平;半定量PCR和Western blot检测成骨关键转录因子Runx2和Dlx5的表达。结果 LPS成功激活TLR4/NF-κB信号通路;LPS抑制BMP9诱导的ALP染色和活性(P<0.01)、钙盐沉积、OCN的mRNA和蛋白质表达(P<0.05)、OPN的mRNA(P<0.01)和蛋白质(P<0.05)表达、Smad1/5/8信号通路激活(P<0.01)、Runx2的mRNA和蛋白质(P<0.05)、Dlx5的mRNA(P<0.01)和蛋白质(P<0.05)表达,BAY11-7082可以部分逆转LPS的抑制作用(P<0.05)。结论 LPS激活TLR4可以通过NF-κB信号通路抑制BMP9诱导的iMEFs成骨分化。

关键词: TLR4, 骨形态发生蛋白9, iMEFs, 成骨分化

Abstract: Objective To study the effect of TLR4 activation with LPS on BMP9-induced osteogenic differentiation of immortalized mouse embryonic fibroblasts(iMEFs). Methods The activation of TLR4/NF-κB signaling pathway was detected by ICC.iMEFs were treated with LPS,BAY11-7082,Adnovirus GFP and BMP9. The early osteogenic differentiation capability ofiMEFs was detected by ALP staining and quantitative assay. The later osteogenic differentiation capability was detected by alizarin red S staining. The expression of later osteogenic differentiation marker gene OCNand OPNwere detected by PCR and Western blot. The change of p-Smad1/5/8 was detected by Western blot. The expression of Runx2and Dlx5 were detected by PCR and Western blot. Results LPS can stimulate TLR4/NF-κB signaling pathway effectively. TLR4 activation inhibited BMP9-induced osteogenic differentiation. BMP9-induced osteogenic differentiation related gene and Smad1/5/8 signaling activation were inhibited by TLR4 activation. The inhibition effect could be partly reversed by BAY11-7082(P<0.05).Conclusions TLR4 activation with LPS can inhibit BMP9-induced osteogenic differentiation of iMEFs cellsvia NF-κB signaling pathway.

Key words: TLR4, BMP9, iMEFs , osteogenic differentiation

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