Related Experiment Video
Updated: Jun 24, 2026

A Mouse Model for Pathogen-induced Chronic Inflammation at Local and Systemic Sites
Published on: August 8, 2014
Potential roles of miR-335-5p on pathogenesis of experimental periodontitis
Junxiang Lian1,2, Xingwen Wu2, Yao Liu2
1Department of Oral & Maxillofacial Surgery, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases & Other Research Platforms, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
Background And Objective:
Periodontitis is a prevalent oral disease responsible for tooth loss. MicroRNAs have been proven crucial in bone disorders over the past decades. Promotive effect on osteogenic activities by microRNA-335-5p (miR-335-5p) has been well demonstrated, but its role involved in the pathogenesis of periodontitis remains elusive. In this study, we established experimental periodontitis (EP) on transgenic mice overexpressing miR-335-5p (335-Tg) to investigate the novel effects of miR-335-5p on periodontal inflammation and bone loss.
Methods:
Experimental periodontitis was established via ligation. The expression of inflammatory and osteoclastic genes was examined by quantitative real-time PCR (qPCR). Morphology of alveolar bone was analyzed by microcomputed tomography (μCT). Hematoxylin and eosin (H&E), tartrate-resistant acid phosphatase (TRAP), and Toll-like receptor 4 (TLR4) immunohistochemistry (IHC) staining were conducted for histological analysis.
Results:
The expression of miR-335-5p decreased significantly in the periodontal tissues of EP. Compared to the WT-EP group, μCT analysis showed less bone loss in the 335-Tg-EP group accompanying with a decreased number of TRAP-positive osteoclasts. H&E and IHC staining exhibited attenuated inflammation and TLR4 expression in the 335-Tg-EP group. Furthermore, reduced expressions of IL-1β, IL-6, TNF-α, and TLR4 were also detected in the 335-Tg-EP group. Overexpression of miR-335-5p in vivo weakened the periodontal bone destruction and inflammation compared with the WT-EP group.
Conclusions:
Our data exhibit novel roles of miR-335-5p in preventing bone loss and inflammation in experimental periodontitis.
Related Concept Videos
The Oral Microbiota
Determinants of Bacterial Pathogenicity and Virulence
Regulation of Bacterial Virulence
Bacterial Meningitis II: Pathophysiology

