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Mechanical Loading Stimulates Expression of Connexin 43 in Alveolar Bone Cells in the Tooth Movement Model

机译:机械负荷刺激牙运动模型中牙槽骨细胞中连接蛋白43的表达。

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Bone osteoblasts and osteocytes express large amounts of connexin (Cx) 43, the component of gap junctions and hemichannels. Previous studies have shown that these channels play im?portant roles in regulating biological functions in response to mechanical loading. Here, we characterized the distribution of mRNA and protein of Cx43 in mechanical loading model of tooth movement. The locations of bone formation and resorption have been well defined in this model, which provides unique experimental systems for better understanding of potential roles of Cx43 in bone formation and remodeling under mechanical stimulation. We found that mechanical loading increased Cx43 mRNA expression in osteoblasts and bone lining cells, but not in osteocytes, at both formation and resorption sites. Cx43 protein, however, increased in both osteoblasts and osteocytes in response to loading. Interestingly, the upregulation of Cx43 protein by loading was even more pronounced in osteocytes compared to other bone cells, with an appearance of punctate staining on the cell body and dendritic process. Cx45 was reported to be expressed in several bone cell lines, but here we did not detect the Cx45 protein in the alveolar bone cells. These results further suggest the potential involvement of Cx43-forming gap junc?tions and hemichannels in the process of mechanically induced bone formation and resorption.
机译:骨成骨细胞和骨细胞表达大量的缝隙连接和半通道连接蛋白(Cx)43。先前的研究表明,这些通道在响应机械负荷调节生物学功能方面起着重要作用。在这里,我们表征了牙齿运动的机械负荷模型中Cx43的mRNA和蛋白质的分布。在此模型中已经很好地定义了骨形成和吸收的位置,该模型提供了独特的实验系统,可以更好地了解Cx43在机械刺激下在骨形成和重塑中的潜在作用。我们发现机械负荷增加了成骨细胞和骨衬细胞中Cx43 mRNA的表达,但在成骨细胞和吸收位点却没有增加骨细胞的Cx43 mRNA表达。然而,Cx43蛋白在成骨细胞和骨细胞中均响应加载而增加。有趣的是,与其他骨细胞相比,在骨细胞中通过加载Cx43蛋白的上调甚至更为明显,在细胞体和树突状过程中出现点状染色。据报道Cx45在几种骨细胞系中表达,但是在这里我们没有在肺泡骨细胞中检测到Cx45蛋白。这些结果进一步表明,Cx43形成的间隙连接和半通道可能参与机械诱导的骨形成和吸收过程。

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