PMID- 26850876 OWN - NLM STAT- MEDLINE DCOM- 20161219 LR - 20161230 IS - 1531-5053 (Electronic) IS - 0278-2391 (Linking) VI - 74 IP - 6 DP - 2016 Jun TI - Effect of p38 Mitogen Activated Protein Kinase Inhibitor on Temporomandibular Joint Synovitis Induced by Occlusal Alteration. PG - 1131-9 LID - S0278-2391(16)00012-4 [pii] LID - 10.1016/j.joms.2015.12.020 [doi] AB - PURPOSE: To investigate the alteration in rat temporomandibular joint (TMJ) synovial membrane induced by increased occlusal vertical dimension (iOVD) and to determine whether the p38 mitogen activated protein kinase (MAPK) signaling cascade is involved. MATERIALS AND METHODS: Thirty-six rats were randomly divided into 3 groups: control + normal saline (NS; controls), iOVD + NS, and iOVD + SB203580 (a potent p38 MAPK inhibitor). Morphologic changes of synovial tissues were observed and scored. Activation levels of p38 MAPK and activating transcription factor-2 (ATF2) were detected by immunohistochemistry. Expression levels of interleukin-1beta (IL-1beta) and matrix metalloproteinase-3 (MMP-3) were measured by quantitative real-time polymerase chain reaction and immunohistochemistry. RESULTS: Obvious synovitis was found in the iOVD group. P38 and ATF2 were activated, and mRNA and protein expression levels of IL-1beta and MMP-3 were upregulated after iOVD. However, decreased synovial tissue inflammation and lower mRNA and protein levels of IL-1beta and MMP-3 were observed in the iOVD + SB203580 group. CONCLUSION: iOVD can induce temporomandibular joint synovitis, and the p38 MAPK signaling cascade might participate in and aggravate the process of articular inflammation. CI - Copyright (c) 2016 The American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved. FAU - Jiang, Linhong AU - Jiang L AD - Dental student, Stomatological Hospital of Shandong University and the Shandong Province Key Laboratory of Oral Tissue Regeneration, Jinan City, Shandong Province, China. FAU - Lin, Xuefen AU - Lin X AD - Resident, Stomatological Hospital of Shandong University and the Shandong Province Key Laboratory of Oral Tissue Regeneration, Jinan City, Shandong Province, China. FAU - Ji, Ping AU - Ji P AD - Professor, Stomatological Hospital of Shandong University and the Shandong Province Key Laboratory of Oral Tissue Regeneration, Jinan City, Shandong Province, China. Electronic address: jiping@mail.sdu.edu.cn. LA - eng PT - Journal Article DEP - 20160107 PL - United States TA - J Oral Maxillofac Surg JT - Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons JID - 8206428 RN - 0 (Imidazoles) RN - 0 (Interleukin-1beta) RN - 0 (Pyridines) RN - EC 2.7.11.24 (p38 Mitogen-Activated Protein Kinases) RN - EC 3.4.24.17 (Matrix Metalloproteinase 3) RN - OU13V1EYWQ (SB 203580) SB - IM MH - Animals MH - Imidazoles/pharmacology MH - Interleukin-1beta/metabolism MH - Male MH - Malocclusion/*complications/physiopathology MH - Matrix Metalloproteinase 3/metabolism MH - Pyridines/pharmacology MH - Rats MH - Rats, Wistar MH - Real-Time Polymerase Chain Reaction MH - Synovitis/*etiology/pathology/physiopathology MH - Temporomandibular Joint Disorders/*etiology/pathology/physiopathology MH - p38 Mitogen-Activated Protein Kinases/*antagonists & inhibitors EDAT- 2016/02/07 06:00 MHDA- 2016/12/20 06:00 CRDT- 2016/02/07 06:00 PHST- 2015/08/03 00:00 [received] PHST- 2015/12/28 00:00 [revised] PHST- 2015/12/30 00:00 [accepted] PHST- 2016/02/07 06:00 [entrez] PHST- 2016/02/07 06:00 [pubmed] PHST- 2016/12/20 06:00 [medline] AID - S0278-2391(16)00012-4 [pii] AID - 10.1016/j.joms.2015.12.020 [doi] PST - ppublish SO - J Oral Maxillofac Surg. 2016 Jun;74(6):1131-9. doi: 10.1016/j.joms.2015.12.020. Epub 2016 Jan 7.