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Effect of corticision on orthodontic tooth movement in a rat model as assessed by RNA sequencing

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Abstract

Corticision is a common technique to accelerate orthodontic tooth movement; however, not much is known about the underlying mechanisms. In this study, we investigated the mechanism of alveolar tissue remodeling after corticision in a rat model of tooth movement (TM) by analyzing the differential transcriptome. A total of 36 male rats were equally divided into TM and TM with corticision (TM+C) groups. Alveolar bone response was examined using micro-computed tomography (micro-CT). Osteoclasts and osteoblasts were quantified on tartrate-resistant acid phosphatase (TRAP) and Goldner’s trichrome staining. The transcriptomes of alveolus around the left maxillary first molar were determined on RNA sequencing (RNA-Seq), and the expression of selected differentially expressed genes (DEGs) validated on quantitative reverse-transcriptase polymerase chain reaction (qRT-PCR). Immunohistochemical examination of alveolar tissue was performed to examine the expressions of correlative proteins of the selected signaling pathway in the TM and TM+C groups. The ratio of bone volume to total volume (BV/TV), and the trabecular number (Tb.N) were significantly decreased, while the movement distance and the trabecular separation (Tb.Sp) was significantly increased in the TM+C group. However, no significant between-group difference in trabecular thickness (Tb.Th) was observed. On histomorphometric analysis, a significant increase in the number of osteoclasts and increased bone resorption was observed in the TM+C group. A total of 399 DEGs were identified on RNA-SEq. Eleven selected genes were confirmed on qRT-PCR, which included components of the Ras signaling pathway. Four proteins of the Ras signaling pathway showed a higher expression in the TM+C group. Our findings indicate that corticision may speed up orthodontic tooth movement by accelerating osteoclastogenesis mediated via the Ras signaling pathway.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (81371179), Natural Science Foundation of Jiangsu Province (BK20150048), and Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (2014-037).

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Correspondence to Zhendong Wang or Junqing Ma.

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The authors declare that they have no conflict of interest with regard to the content of this article.

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Qihui Gu and Shuyu Guo have contributed equally to this work.

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Gu, Q., Guo, S., Wang, D. et al. Effect of corticision on orthodontic tooth movement in a rat model as assessed by RNA sequencing. J Mol Hist 48, 199–208 (2017). https://doi.org/10.1007/s10735-017-9718-3

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  • DOI: https://doi.org/10.1007/s10735-017-9718-3

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