Abstract
This study examined the histological changes and possible effects of intermittent parathyroid hormone (PTH) (1-34) treatment during the early and late phase of periodontal repair in a rat model of tooth root resorption. In a total of 70 animals, which either received intermittent PTH(1-34) systemically or sham injections for up to 70 days after discontinuation of an orthodontic force, histological characteristics were correlated to time-dependent distinct expression patterns of osteoprotegerin and receptor activator of nuclear factor kappaB ligand by PDL cells in the former compression and tension side of tooth movement by means of immunohistochemistry and histomorphometrical analysis. The balance of these key regulators of bone remodeling was demonstrated to be shifted in favor of hard tissue repair by intermittent PTH administration, which was demonstrated to exert anabolic effects in several cell culture and animal experiments as well as in humans, in the late phase of repair. These data indicate a role for PDL cells as potent regulators of periodontal repair by modifying the local microenvironment and point to the anabolic potential of an intermittent PTH administration to support these reparative processes.
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The authors thank I. Bay-Müller for technical assistance and C. Maelicke for her help in preparing the manuscript. This research was supported by a research grant from the Deutsche Forschungsgemeinschaft (DFG, KFO 208). The authors declare that they do not have any conflict of interest.
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Lossdörfer, S., Yildiz, F., Götz, W. et al. Anabolic effect of intermittent PTH(1-34) on the local microenvironment during the late phase of periodontal repair in a rat model of tooth root resorption. Clin Oral Invest 14, 89–98 (2010). https://doi.org/10.1007/s00784-009-0263-7
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DOI: https://doi.org/10.1007/s00784-009-0263-7