Abstract:
BACKGROUND AND OBJECTIVE:High-mobility-group box 1 functions as a late-phase inflammatory mediator. It can be released extracellularly by macrophages and necrotic cells through lipopolysaccharide and tumor necrosis factor-alpha. The objective of this study was to clarify the source of high-mobility-group box 1 in chronic periodontitis tissues and tumor necrosis factor-alpha-stimulated gingival epithelial cells, and subsequently elucidate its inducible inflammatory pathway. MATERIAL AND METHODS:Chronic periodontitis and healthy gingival sections were stained for high-mobility-group box 1 by immunohistochemistry and immunofluorescence. The amounts of high-mobility-group box 1 released into the gingival crevicular fluid and supernatants from gingival epithelial cells stimulated by tumor necrosis factor-alpha were examined by western blot. The phosphorylation of mitogen-activated protein kinases (MAPKs) in gingival epithelial cells was also examined. RESULTS:High-mobility-group box 1 was detected in the cytoplasm and nucleus of gingival epithelial cells with periodontitis. Western blotting revealed a significant increase in high-mobility-group box 1 expression in the gingival crevicular fluid from periodontitis patients. High-mobility-group box 1 production in gingival epithelial cells was increased following stimulation with tumor necrosis factor-alpha. The molecular dialogue between tumor necrosis factor-alpha and gingival epithelial cells involved modulation of the activities of p38MAPK, Jun N-terminal kinase and p44/42. Interestingly, only phosphorylation of p38MAPK contributed to more than half of the signaling initiated by tumor necrosis factor-alpha-elicited high-mobility-group box 1 release. CONCLUSION:High-mobility-group box 1 is continuously released from the gingival epithelial cells modulated by tumor necrosis factor-alpha. These findings imply that high-mobility-group box 1 expression and possibly p38MAPK constitute important features in periodontitis.
journal_name
J Periodontal Resjournal_title
Journal of periodontal researchauthors
Morimoto Y,Kawahara KI,Tancharoen S,Kikuchi K,Matsuyama T,Hashiguchi T,Izumi Y,Maruyama Idoi
10.1111/j.1600-0765.2007.00996.xsubject
Has Abstractpub_date
2008-02-01 00:00:00pages
76-83issue
1eissn
0022-3484issn
1600-0765pii
JRE996journal_volume
43pub_type
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doi:10.1111/j.1600-0765.1992.tb02085.x
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pub_type: 临床试验,杂志文章
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更新日期:1998-01-01 00:00:00
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