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Dynamic alternations of RANKL/OPG ratio expressed by cementocytes in response to orthodontic‑induced external apical root resorption in a rat model

  • Authors:
    • Tingting Wei
    • Zhiyi Shan
    • Xin Wen
    • Ning Zhao
    • Gang Shen
  • View Affiliations / Copyright

    Affiliations: Department of Preventive Dentistry, Shanghai Key Laboratory of Stomatology, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China, Department of Orthodontics, Faculty of Dentistry, The University of Hong Kong, Hong Kong, SAR, P.R. China, Department of Orthodontics, Shanghai Key Laboratory of Stomatology, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China, Department of Orthodontics, Shanghai Key Laboratory of Stomatology, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
    Copyright: © Wei et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 228
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    Published online on: May 20, 2022
       https://doi.org/10.3892/mmr.2022.12744
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Abstract

The aim of the present study was to investigate the alterations in the formation of cementocytes in response to orthodontic forces and to evaluate the contribution of these cells in the biological changes of tooth movement and associated root resorption. A total of 90 Sprague Dawley rats were randomly assigned to the control, high force, and low force groups. Intrusion forces of 10 and 50 g were applied on the rat molar to induce tooth intrusion. The tooth movement was observed from 0 to 14 days by micro‑computed tomography, bone histometric analysis, tartrate‑resistant acid phosphatase staining, as well as reverse transcription‑quantitative PCR and immunofluorescence staining assays. The results suggested that under low force conditions, osteoclasts were distributed at a higher frequency on the bone side than on the root side. Under high force conditions, both sides suffered osteoclast infiltration. In the low force group, the cementocytes exhibited downregulated sclerostin (SOST) and osteoprotegerin (OPG) mRNA levels and a lower receptor activator of nuclear factor‑κB ligand (RANKL)/OPG ratio over a certain period of time. The expression levels of these genes were lower compared with those of the osteocytes at each time‑point. In the high force group, both cementocytes and osteocytes upregulated the SOST and RANKL/OPG ratio on days 7 and 14, while the cementocytes expressed higher levels of SOST mRNA than those noted in the osteocytes. These data suggested that cementocytes responded to the orthodontic force via modulation of the RANKL/OPG ratio and SOST expression. The biological response of cementocytes contributed to the mechanotransduction and homoeostasis of the roots under compression. Excessive forces may act as a negative factor of this regulatory role. These results expand our knowledge on the function of cementocytes.
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Copy and paste a formatted citation
Spandidos Publications style
Wei T, Shan Z, Wen X, Zhao N and Shen G: Dynamic alternations of RANKL/OPG ratio expressed by cementocytes in response to orthodontic‑induced external apical root resorption in a rat model. Mol Med Rep 26: 228, 2022.
APA
Wei, T., Shan, Z., Wen, X., Zhao, N., & Shen, G. (2022). Dynamic alternations of RANKL/OPG ratio expressed by cementocytes in response to orthodontic‑induced external apical root resorption in a rat model. Molecular Medicine Reports, 26, 228. https://doi.org/10.3892/mmr.2022.12744
MLA
Wei, T., Shan, Z., Wen, X., Zhao, N., Shen, G."Dynamic alternations of RANKL/OPG ratio expressed by cementocytes in response to orthodontic‑induced external apical root resorption in a rat model". Molecular Medicine Reports 26.1 (2022): 228.
Chicago
Wei, T., Shan, Z., Wen, X., Zhao, N., Shen, G."Dynamic alternations of RANKL/OPG ratio expressed by cementocytes in response to orthodontic‑induced external apical root resorption in a rat model". Molecular Medicine Reports 26, no. 1 (2022): 228. https://doi.org/10.3892/mmr.2022.12744
Copy and paste a formatted citation
x
Spandidos Publications style
Wei T, Shan Z, Wen X, Zhao N and Shen G: Dynamic alternations of RANKL/OPG ratio expressed by cementocytes in response to orthodontic‑induced external apical root resorption in a rat model. Mol Med Rep 26: 228, 2022.
APA
Wei, T., Shan, Z., Wen, X., Zhao, N., & Shen, G. (2022). Dynamic alternations of RANKL/OPG ratio expressed by cementocytes in response to orthodontic‑induced external apical root resorption in a rat model. Molecular Medicine Reports, 26, 228. https://doi.org/10.3892/mmr.2022.12744
MLA
Wei, T., Shan, Z., Wen, X., Zhao, N., Shen, G."Dynamic alternations of RANKL/OPG ratio expressed by cementocytes in response to orthodontic‑induced external apical root resorption in a rat model". Molecular Medicine Reports 26.1 (2022): 228.
Chicago
Wei, T., Shan, Z., Wen, X., Zhao, N., Shen, G."Dynamic alternations of RANKL/OPG ratio expressed by cementocytes in response to orthodontic‑induced external apical root resorption in a rat model". Molecular Medicine Reports 26, no. 1 (2022): 228. https://doi.org/10.3892/mmr.2022.12744
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