J Periodontol:TLR4在种植体周围炎中的作用探讨

2020-05-31 网络 网络

本研究采用牙龈卟啉单胞菌感染和结扎诱导种植体周围炎小鼠模型,旨在确定Toll样受体4(TLR4)在炎症和牙槽骨吸收中的作用。

本研究采用牙龈卟啉单胞菌感染和结扎诱导种植体周围炎小鼠模型,旨在确定Toll样受体4(TLR4)在炎症和牙槽骨吸收中的作用。

实验采用野生型(WT)和TLR4-/-(TLR4 KO)小鼠,拔除左侧上颌第一和第二磨牙6周后,在拔牙窝种植光滑表面钛种植体。种植体植入4周并确认骨结合后,将浸有P. gingivalis菌液的丝线结扎在种植体周围。结扎2周后,通过显微计算机断层扫描、酒石酸耐酸磷酸酶(TRAP)染色、免疫生物学检查和实时定量聚合酶链式反应分别评估骨吸收、破骨细胞生成、细胞炎症反应和牙龈mRNA表达水平。

结果发现,在WT和TLR4 KO小鼠中,P. gingivalis/结扎组与对照组相比,种植体周围的骨吸收明显增加。在P. gingivalis/结扎组中,TLR4 KO小鼠的骨重吸收、TRAP+细胞形成和牙龈CD3+和CD45+细胞浸润水平较WT组小鼠有明显下降。P.gingivalis/结扎后,WT小鼠与TLR4 KO小鼠的受体激活剂NF-kB配体/骨保护素(RANKL/OPG)比值显着增加,TLR4 KO组小鼠没有显着变化。P. gingivalis/结扎组与相应的对照组相比,TLR4 KO小鼠的牙龈mRNA表达的IL-1β、IFN-γ和1L-17明显增加。

本研究表明,TLR4通过调节免疫B细胞浸润、RANKL/OPG表达比例和差异性炎症细胞因子的产生,在P.gingivalis/结扎诱发的牙周炎中介导牙槽骨吸收。

原文出处:

Shu Deng,TLR4 mediates alveolar bone resorption in experimental peri-implantitis through regulation of CD45+ cell infiltration, RANKL/OPG ratio, and inflammatory cytokine production, journal of periodontology, 2020 May, doi:10.1002/JPER.18-0748

 

 

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    2020-09-13 feather89
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    2020-12-28 lilianxiang
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    2020-08-11 huangdf
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