Expression of lubricin in rat posterior mandibular condylar cartilage following functional mandibular forward repositioning

  • Zheng Chen
  • Zhihui Mai
  • Shaoqin Tu
  • Hongfei Lu
  • Lin Chen
  • Hong AiEmail author
Original Article



The aim of the present study was to investigate the effects of mandibular forward repositioning on expression of lubricin in rat posterior condylar cartilage.


In total, fifty 5‑week-old female Sprague Dawley rats were divided randomly into experimental groups and control groups. The animals in the experimental groups were fitted with modified acrylic inclined planes to advance the mandible, whereas rats in the normal control groups were left intact. Rats were sacrificed on days 3, 7, 14, 21, and 30, and temporomandibular joint (TMJ) samples were collected. The expression of lubricin of the posterior mandibular condylar cartilage was evaluated by immunohistochemistry.


In the control groups, higher expression of lubricin was observed in the proliferative zone of the posterior mandibular condylar cartilage compared with the hypertrophic zone during the experimental period. Compared with the control group, the positive signals for lubricin of the posterior mandibular condylar cartilage in the experimental animals were significantly higher on days 7, 14, and 21; however, no statistical difference was found on day 3 or 30.


Data analyses suggest that the bite jumping appliance temporarily enhanced lubricin expression, providing a good mechanical environment for the physiologic growth of the condyle and mandible, and contributes to TMJ remodeling by the regulation of condylar chondrocyte proliferation.


Animal studies Growth Temporomandibular joint Disc Functional orthodontic treatment 

Lubricinexpression im posterioren kondylären Knorpel bei Ratten nach funktionskieferorthopädischer Unterkiefervorverlagerung



Ziel der vorliegenden Studie war es, die Auswirkungen der Unterkiefervorverlagerung auf die Lubricinexpression im posterioren kondylären Knorpels bei Ratten zu untersuchen.


Insgesamt wurden fünfzig 5 Wochen alte weibliche Sprague-Dawley-Ratten nach dem Zufallsprinzip in Versuchsgruppen und Kontrollgruppen eingeteilt. Bei den Tieren in den Versuchsgruppen wurden modifizierte Acrylplatten mit schiefer Ebene eingesetzt, um eine Unterkiefervorverlagerung zu erreichen, während die Ratten in den Kontrollgruppen keine Apparaturen erhielten. Die Ratten wurden nach 3, 7, 14, 21 und 30 Tagen geopfert und Proben des Kiefergelenks (TMJ) entnommen. Die Lubricinexpression des posterioren kondylären Knorpels wurde immunohistochemisch bestimmt.


In den Kontrollgruppen wurde im experimentellen Zeitraum in der proliferativen Zone des posterioren Kondylarknorpels eine höhere Expression von Lubricin festgestellt als in der hypertrophen Zone. Im Vergleich mit der Kontrollgruppe war die Lubricinexpression im posterioren Kondylarknorpel bei den Versuchstieren nach 7, 14 und 21 Tagen signifikant höher, nach 3 bzw. 30 Tagen wurde jedoch kein statistisch signifikanter Unterschied gefunden.


Die Analyse der vorliegenden Daten deutet darauf hin, dass die funktionskieferorthopädische Apparatur temporär die Lubricinexpression erhöhte und damit gute Bedingungen für das physiologische Wachstum des Unterkiefers und des Kondylus gegeben sind, da Lubricinexpression zur Remodellierung des Kiefergelenks beiträgt, indem es die Proliferation von Chondrozyten reguliert.


Tierexperimentelle Studie Wachstum Kiefergelenk Diskus Funktionskieferorthopädie 


Conflict of interest

C. Zheng, M. Zhihui, T. Shaoqin, L. Hongfei, C. Lin and A. Hong declare that they have no competing interests.


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Copyright information

© Springer Medizin Verlag GmbH, ein Teil von Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Stomatology, The Third Affiliated HospitalSun Yat-sen UniversityGuangzhouChina
  2. 2.Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology and Guangdong Provincial Key Laboratory of StomatologySun Yat-sen UniversityGuangzhouChina

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