4.6 Article

Traumatic occlusion aggravates bone loss during periodontitis and activates Hippo-YAP pathway

Journal

JOURNAL OF CLINICAL PERIODONTOLOGY
Volume 46, Issue 4, Pages 438-447

Publisher

WILEY
DOI: 10.1111/jcpe.13065

Keywords

bone destruction; Hippo pathway; occlusal trauma; periodontitis; YAP; TAZ

Funding

  1. National Natural Science Foundation of China [81570987, 81400523, 81601909, 81621062, 81520108009]
  2. Sichuan provincial science and Technology Foundation [2016FZ0074, 2016JY0142, 2017FZ0049, 2018FZ0042]

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Aim This study aimed at exploring changes in YAP expression and their effect on periodontitis (PD) combined with traumatic occlusion (TO). Materials and Methods BALB/cJ mice were used to establish a PD model by local administration of Porphyromonas gingivalis (P.g, ATCC 33277) and a TO model by occlusal elevation (OE) using composite resin bonding on the bilateral maxillary molar. The mouse fibroblast cell line (L929) and pre-osteoblast cell line (MC3T3-E1) were subjected to cyclic tensile/compressive stress and inflammatory stimuli (lipopolysaccharide from Escherichia coli) to verify in vivo results. Results Severe bone resorption was observed by microCT scanning in OE with P.g group, when compared to OE only and P.g only groups. Mechanical stress caused by OE activated the Hippo-YAP pathway in periodontal tissues and upregulated the expression of JNK/AP-1. OE with P.g further promoted the expression of YAP and JNK/AP1, leading to the upregulation of the JNK/AP-1 related inflammatory cytokines TNF-alpha and IL6. Similar results were obtained when osteoblasts were subjected to mechanical stress in vitro. Conclusions Our study demonstrated that periodontitis with TO caused severe inflammation-induced bone resorption. Activation of YAP and upregulation of JNK/AP-1 induced by TO potentially aggravated the symptoms of PD.

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