Effects of chronic Porphyromonas gingivalis lipopolysaccharide infusion on skeletal muscles in mice
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Periodontitis, which is caused by various oral organisms, predominantly affects adults, and is one of the main causes of tooth loss, as well as leading to progression of numerous systemic diseases. However, its relationship to sarcopenia (aging-associated degenerative loss of skeletal muscle mass and function) remains unclear. The aim of this study was to investigate the effects of Porphyromonas gingivalis lipopolysaccharide (PG-LPS) on skeletal muscle in mice, and to establish the underlying mechanisms. Mice (C57BL/6) were injected with PG-LPS (0.8 mg/kg/day) for 4 weeks. This treatment significantly decreased the weight of fast-twitch skeletal muscles (masseter and tibialis anterior muscles), but not that of slow-twitch skeletal muscle (soleus muscle). The area of fibrosis was significantly increased in masseter muscle, but remained unchanged in the other two muscles. The number of apoptotic myocytes was significantly increased (approximately eightfold) in masseter muscle. These data suggest that persistent subclinical exposure to PG-LPS might reduce the size of fast-twitch skeletal muscle, but not slow-twitch skeletal muscle. Masseter muscle appears to be especially susceptible to the adverse effects of PG-LPS, because muscle remodeling (muscle fibrosis and myocyte apoptosis) was induced solely in masseter muscle. Thus, periodontitis might be one of the major causes of oral sarcopenia.
KeywordsLipopolysaccharide Periodontitis Sarcopenia Apoptosis Fibrosis Signal transduction
This study was supported in part by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grants (17K12067 to YO, 15K18973 to K.Suita, 17K11977 to MN, 17K17342 to DU and 18K06862, 16H05300 to SO); the MEXT-Supported Program for the Strategic Research Foundation at Private Universities (S1511018 to SO); an Academic Contribution from Pfizer Japan (AC160910, AC1500818, AC170780 to SO); Mitsui Life Social Welfare Foundation (SO), and Research Promotion Grants from the Society for Tsurumi University School of Dental Medicine (29002, 27010 to IA, 28006 to NK, 28006 to YY, 29007 to K. Suita).
Compliance with ethical standards
Conflict of interest
The authors report no conflict of interests.
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