Schroeder, Agnes and Bauer, Kathrin and Spanier, Gerrit and Proff, Peter and Wolf, Michael and Kirschneck, Christian (2018) Expression kinetics of human periodontal ligament fibroblasts in the early phases of orthodontic tooth movement. JOURNAL OF OROFACIAL ORTHOPEDICS-FORTSCHRITTE DER KIEFERORTHOPADIE, 79 (5). pp. 337-351. ISSN 1434-5293, 1615-6714
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Purpose Human periodontal ligament (hPDL) fibroblasts play a crucial mediating role in orthodontic tooth movement (OTM). In this study, we investigated the expression kinetics of genes associated with OTM in its early phase to obtain better insight into the timing and regulation of molecular and cellular signalling and transformation processes occurring in compressive areas of the periodontal ligament during OTM. Methods Adherent hPDL fibroblasts were stimulated with physiological orthodontic compressive forces of 2 g/cm(2) for 24, 48, 72, and 96 h under cell culture conditions. At each time point, we quantified relative gene expression of genes involved in bone remodelling (ALPL), inflammation (COX2, IL-6), extracellular matrix reorganization (COL1A2, P4HA1, FN1, MMP8) and angiogenesis (VEGF-A) by means of RT-qPCR as well as protein expression of osteoclastogenesis-regulating RANK-L and OPG relative to pressure-untreated controls incubated for corresponding time periods. In addition, coculture experiments with osteoclast precursor cells were performed to determine the extent of hPDL-fibroblast-mediated osteoclastogenesis (TRAP staining). Results As primary response to compressive forces within 24 h, we observed an induction of genes associated with angiogenesis, inflammation, osteoblastogenesis, and the remodelling of the extracellular matrix, with RANK-L expression at first slightly inhibited and only increased after 48 h. Major hPDL-mediated osteoclastogenesis was observed after 72 h with minor, non-RANK-L-dependent osteoclastogenesis occurring as early as 24 h after compressive force application. Conclusions hPDL fibroblasts seem to play a major mediating role in the early phase of OTM with a differentiated, time-dependent regulation and expression pattern of cytokines and other mediators.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ALKALINE-PHOSPHATASE ACTIVITY; MATRIX METALLOPROTEINASES; OSTEOCLAST FORMATION; TISSUE; COMPRESSION; TENSION; CELLS; PDL; INTERLEUKIN-6; RESORPTION; Osteoclasts; Interleukin 6; Vascular endothelial growth factor A; Cell culture techniques; Bone remodeling |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Kieferorthopädie Medicine > Lehrstuhl für Mund-, Kiefer- und Gesichtschirurgie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Jan 2020 14:48 |
| Last Modified: | 09 Jan 2020 14:48 |
| URI: | https://pred.uni-regensburg.de/id/eprint/13995 |
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