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Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie 2/2023

Open Access 21-04-2022 | Shock | Original Article

Impact of phosphorylation of heat shock protein 27 on the expression profile of periodontal ligament fibroblasts during mechanical strain

Authors: PD Dr. rer. nat. Agnes Schröder, Kathrin Wagner, PD Dr. Fabian Cieplik, DDS, Dr. Gerrit Spanier, MD, DDS, Professor Dr. Dr. Peter Proff, MD, DDS, PD Dr. Dr. Christian Kirschneck, DDS

Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Special Issue 2/2023

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Abstract

Purpose

Orthodontic tooth movement is a complex process involving the remodeling of extracellular matrix and bone as well as inflammatory processes. During orthodontic treatment, sterile inflammation and mechanical loading favor the production of receptor activator of NF-κB ligand (RANKL). Simultaneously, expression of osteoprotegerin (OPG) is inhibited. This stimulates bone resorption on the pressure side. Recently, heat shock protein 27 (HSP27) was shown to be expressed in the periodontal ligament after force application and to interfere with inflammatory processes.

Methods

We investigated the effects of phosphorylated HSP27 on collagen synthesis (COL1A2 mRNA), inflammation (IL1B mRNA, IL6 mRNA, PTGS2 protein) and bone remodeling (RANKL protein, OPG protein) in human periodontal ligament fibroblasts (PDLF) without and with transfection of a plasmid mimicking permanent phosphorylation of HSP27 using real-time quantitative polymerase chain reaction (RT-qPCR), western blot and enzyme-linked immunosorbent assays (ELISAs). Furthermore, we investigated PDLF-induced osteoclastogenesis after compressive strain in a co-culture model with human macrophages.

Results

In particular, phosphorylated HSP27 increased gene expression of COL1A2 and protein expression of PTGS2, while IL6 mRNA levels were reduced. Furthermore, we observed an increasing effect on the RANKL/OPG ratio and osteoclastogenesis mediated by PDLF.

Conclusion

Phosphorylation of HSP27 may therefore be involved in the regulation of orthodontic tooth movement by impairment of the sterile inflammation response and osteoclastogenesis.
Appendix
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Metadata
Title
Impact of phosphorylation of heat shock protein 27 on the expression profile of periodontal ligament fibroblasts during mechanical strain
Authors
PD Dr. rer. nat. Agnes Schröder
Kathrin Wagner
PD Dr. Fabian Cieplik, DDS
Dr. Gerrit Spanier, MD, DDS
Professor Dr. Dr. Peter Proff, MD, DDS
PD Dr. Dr. Christian Kirschneck, DDS
Publication date
21-04-2022
Publisher
Springer Medizin
Keywords
Shock
Shock
Published in
Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Issue Special Issue 2/2023
Print ISSN: 1434-5293
Electronic ISSN: 1615-6714
DOI
https://doi.org/10.1007/s00056-022-00391-w

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