牙龈卟啉单胞菌
牙周组织
炎症
碱性磷酸酶
下调和上调
化学
肿瘤坏死因子α
极限抗拉强度
拉伤
分泌物
内分泌学
男科
内科学
分子生物学
牙周炎
酶
生物
生物化学
医学
材料科学
牙科
冶金
基因
作者
Yi Wang,Haiyan Wang,Qingsong Ye,Jie Yang,Chunyan Xu,Lin Li,Hui Deng,Rongdang Hu
出处
期刊:Life Sciences
[Elsevier]
日期:2013-07-01
卷期号:93 (1): 38-43
被引量:8
标识
DOI:10.1016/j.lfs.2013.05.015
摘要
Orthodontic forces are known to aggravate inflammation-induced destruction of the periodontium, but the underlying mechanism has not been elucidated. The present study investigates how inflammation and forces co-regulate periodontium damage.Cultures of MC3T3-E1 osteoblasts were pre-treated with conditioned medium from RAW264.7 macrophages exposed to 100ng/ml Porphyromonas gingivalis (Pg)-LPS. Conditioned medium was analyzed by ELISA for interleukin-1 beta (IL-1β), interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-α). Osteoblasts were then subjected to tensile strain (0.5Hz; 1000μ or 3000μ) for 0min, 5min, 15min, 30min, 1h, 3h, and 6h. The cultures were analyzed for mRNA and protein levels of c-fos. Cells were also analyzed for alkaline phosphatase (ALP) activity.(Pg)-LPS stimulated the secretion of all three cytokines from RAW264.7 cells in a dose- and time-dependent manner. Medium from (Pg)-LPS stimulated cells induced a 10-fold increase in c-fos expression, which decreased to a 4-fold plateau after 3h. In contrast, ALP activity of control osteoblasts decreased during the first 60min, then recovered over the next 4h. Pretreatment with conditioned medium generated the same initial decrease during tensile strain but prevented the recovery.Our study showed, for the first time, that the inhibitory effect of inflammation and tensile strain on osteogenicity is associated with the upregulation in c-fos expression. In addition, inflammation may reduce the ability of osteoblasts to restore their osteogenic capacity during sustained tensile stress and contribute to periodontium damage.
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