Abstract
Objective
Orthodontic treatment is usually associated with the application of forces to teeth and periodontium. Instrumental in transmitting these forces are the cells of the periodontal ligament (PDL). In the present study, we used an established strain model to investigate the potential role of biophysical stimulation in modulating the gene expression pattern of these PDL cells.
Materials and methods
PDL cells derived from non-carious and periodontally healthy teeth of six patients were grown on culture plates coated with collagen type I. Upon completion of culture, dynamic strain was applied to the cells for 24 h, using 3% of tensile force and a frequency of 0.05 Hz. This loading protocol for biomechanical stimulation was followed by extracting the RNA from the cells and using a RT2 PCR array® for analysis.
Results
Compared to non-stimulated control cells, this analysis revealed the induction of several factors (e.g., RELA, IRF1, MAX, MYC, CDKN1B, BCL2, BCL2A1) known to influence tissue homeostasis by contributing essentially to cell proliferation, cell differentiation, and the inhibition of apoptosis.
Conclusion
This study demonstrates that the biomechanical stimulation of PDL cells is an important factor in periodontal tissue homeostasis.
Zusammenfassung
Zielsetzung
Während der kieferorthopädischen Therapie kommt es in der Regel zu einer Kraftapplikation auf Zähne und somit auch auf den Zahnhalteapparat. Bei der Kraftübertragung haben vor allem die Zellen des parodontalen Ligaments (PDL-Zellen) eine entscheidende Bedeutung. Inwieweit eine biophysikalische Stimulierung das Genexpressionsmuster der Zellen beeinflusst, sollte in einem etablierten Dehnungsmodell untersucht werden.
Material und Methodik
PDL-Zellen von sechs Patienten wurden von gesunden, kariesfreien Zähnen gewonnen und auf Kollagen-Typ-I-beschichteten BioFlex®-Platten kultiviert. Anschließend wurden die Zellen mit einer dynamischen Zugkraft von 3% für 24 h mit einer Frequenz von 0,05 Hz gedehnt. Nach Abschluss des Belastungsregimes wurde die RNA aus den Zellen extrahiert und das RT2 Profiler PCR Array® durchgeführt.
Ergebnisse
In der Array-Analyse zeigte sich nach biomechanischer Stimulation im Vergleich zu unstimulierten Kontrollzellen eine Induktion mehrerer Faktoren (u. a. RELA, IRF1, MAX, MYC, CDKN1B, BCL2, BCL2A1). Diese spielen eine entscheidende Rolle bei der Zellproliferation, Zelldifferenzierung und Inhibition der Apoptose und beeinflussen somit die Gewebehomöostase.
Schlussfolgerung
In der Studie konnte gezeigt werden, dass die biomechanische Stimulation von PDL-Zellen ein wichtiger Faktor in der Gewebehomöostase des parodontalen Gewebes ist.
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Acknowledgement
We would like to thank Dipl.-Biol. Jan Reckenbeil and Imke Beier for their support. This study was funded by the German Research Foundation (KFO208/TP7) and the Medical Faculty of the University of Bonn.
Danksagung
Wir bedanken uns bei Herrn Dipl.-Biol. Jan Reckenbeil und bei Frau Imke Beier für ihre Unterstützung. Diese Studie wurde unterstützt von der Deutschen Forschungsgemeinschaft (KFO208/TP7) und der Medizinischen Fakultät der Universität Bonn.
Conflict of interest
On behalf of all authors, the corresponding author states that there are no conflicts of interest.
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Die korrespondierende Autorin gibt für sich und ihre Koautoren an, dass kein Interessenkonflikt besteht.
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Birgit Deschner and Björn Rath contributed equally to this study.
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Deschner, B., Rath, B., Jäger, A. et al. Gene analysis of signal transduction factors and transcription factors in periodontal ligament cells following application of dynamic strain. J Orofac Orthop 73, 486–497 (2012). https://doi.org/10.1007/s00056-012-0104-1
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DOI: https://doi.org/10.1007/s00056-012-0104-1