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牙周组织的慢性、持续性炎症导致牙槽骨病理性吸收,最终造成牙齿松动甚至脱落,为成年人失牙的主要原因[1-2],如何促进牙周骨组织再生成为目前研究的热门话题。骨髓间充质干细胞(bone marrow mesenchymal stem cells, BMMSCs)具有取材方便、易在体外培养、扩增等优势,在一定条件下具有成骨分化的潜能,是组织工程技术常用的种子细胞[3-4]。
大量文献[5-6]显示炎性环境下BMMSCs具有免疫调控功能,通过与免疫细胞相互作用,分泌多种具有生物活性的细胞因子,如白细胞介素(IL)-6、IL-8、IL-1β、转化生长因子-β(TGF-β)等,参与不同的信号通路。当处于炎症环境时,BMMSCs通过减少炎症因子分泌、调节局部炎症微环境发挥其抗炎及免疫抑制作用[7-8]。在BMMSCs进行成骨诱导时,碱性磷酸酶(ALP)、Runx相关转录因子2(Runx 2)、骨钙素(OCN)等成骨相关蛋白表达增高。但是,炎症环境下BMMSCs成骨相关蛋白表达及骨向分化机制尚不完全清楚。本研究拟通过检测炎性环境下BMMSCs各成骨相关蛋白表达、上清液内相关细胞因子的表达以及这些炎症因子对BMMSCs骨向分化中的影响。现作报道。
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TNF-α作用7 d时,Western blotting结果显示,成骨诱导组及TNF-α作用下的成骨诱导组中成骨相关蛋白ALP、OCN、RUNX2表达水平均高于相应的对照组(P < 0.05);TNF-α作用下的成骨组ALP表达水平较正常条件下的成骨组高,而OCN、RUNX2表达水平却较正常条件下的成骨组低,差异均有统计学意义(P < 0.05)(见图 1、表 1)。
分组 n ALP OCN RUNX2 正常组 9 0.74±0.01 0.59±0.03 0.36±0.01 OM组 9 1.10±0.03* 1.19±0.03* 0.93±0.09* TNF-α组 9 0.68±0.03*# 0.54±0.02# 0.49±0.01*# TNF-α+OM组 9 1.34±0.04*#▲ 0.80±0.03*#▲ 0.68±0.01*#▲ F — 341.68 349.31 94.36 P — < 0.01 < 0.01 < 0.01 MS组内 — 0.001 0.001 0.002 q检验:与正常组比较*P < 0.05;与OM组比较#P < 0.05;与TNF-α组比较▲P < 0.05 表 1 不同培养条件下BMMSCs内ALP、OCN、RUNX2蛋白表达的影响(x±s)
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TNF-α作用下BMMSCs上清液中IL-6、IL-8、IL-1β、TGF-β1、TGF-β2细胞因子水平均较对照组增高,差异有统计学意义(P < 0.01);而TGF-β1、TGF-β2的表达水平在TNF-α作用后增加幅度较大,其中TGF-β1增幅最大(见表 2)。
分组 n IL-6 IL-8 IL-1β TGF-β1 TGF-β2 正常组 9 150.60±1.84 302.47±0.70 91.61±0.88 96.46±1.11 91.62±0.85 TNF-α组 9 192.88±2.03 358.33±2.02 130.42±1.79 254.67±2.03 180.94±1.36 t — 26.76 45.37 33.73 118.50 96.21 P — < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 表 2 TNF-α作用下BMMSCs上清液中各细胞因子浓度的表达(x±s;pg/mL)
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各细胞因子组中ALP、RUNX2、OCN蛋白表达与对照组相比差异有统计学意义(P < 0.05);其中ALP蛋白在TGF-β1组中表达水平均值为0.84±0.03,较IL-6、IL-8、IL-1β组中ALP蛋白表达水平高,较TGF-β2组低,差异均有统计学意义(P < 0.05);而RUNX2和OCN蛋白在TGF-β1组中表达最高,且与其他各组相比差异均有统计学意义(P < 0.05)(见图 2、表 3)。
分组 n ALP OCN RUNX2 正常组 9 0.63±0.03 0.35±0.04 0.67±0.02 IL-6组 9 0.61±0.03 0.85±0.04*# 0.81±0.04*# IL-8组 9 0.65±0.02 0.84±0.06*# 0.58±0.00*# IL-1β组 9 0.62±0.05 0.75±0.07*# 0.67±0.03*# TGF-β1组 9 0.84±0.03* 1.39±0.02* 0.87±0.03* TGF-β2组 9 1.05±0.08*# 0.95±0.03*# 0.73±0.02*# F — 46.88 154.77 41.79 P — < 0.01 < 0.01 < 0.01 MS组内 — 0.002 0.002 0.001 q检验:与正常组比较*P < 0.05;与TGF-β1组比较#P < 0.05 表 3 分别加入不同细胞因子对不同组成骨相关蛋白相对表达量的影响(x±s)
炎症微环境下骨髓间充质干细胞上清液内细胞因子表达及其对成骨分化的影响
Cytokines emxpression in the supernatant of bone marrow mesenchymal stem cells under inflammatory microenvironment and its effects on osteogenic differentiation
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摘要:
目的探讨炎症微环境下骨髓间充质干细胞(BMMSCs)上清液内细胞因子的表达及其对BMMSCs骨分化的影响。 方法Western blotting检测正常条件下与炎症条件下培养的BMMSCs成骨相关蛋白的表达;ELISA检测正常环境与炎性环境下BMMSCs上清液中不同细胞因子的表达,比较各细胞因子含量变化;在正常条件下加入各细胞因子,检测各组BMMSCs内成骨分化相关蛋白表达情况。 结果BMMSCs在炎性环境下成骨能力较正常环境下未有明显减弱;ELISA检测结果显示IL-6、IL-8、IL-1β、TGF-β1、TGF-β2表达在炎症环境下均较正常环境下增高,差异均有统计学意义(P < 0.01);正常环境下加入不同细胞因子后,TGF-β1组诱导的BMMSCs成骨相关蛋白表达水平升高最为明显。 结论炎症环境诱导BMMSCs分泌的TGF-β1主要参与其骨向分化的过程。 Abstract:ObjectiveTo investigate the expression level of cytokines in the supernatant of bone marrow mesenchymal stem cells(BMMSCs) under inflammatory microenvironment, and its effects on the osteogenic differentiation of BMMSCs. MethodsWestern blotting was used to detect the expression levels of osteogenic proteins in BMMSCs cultured under normal and inflammatory environment. The expression levels of different cytokines in the supernatant of BMMSCs under normal and inflammatory environment were detected by ELISA, and the content change of each cytokine was compared between normal and inflammatory environment. The expression levels of osteogenic differentiation-related proteins in BMMSCs in each group were detected under the adding cytokines to normal environment. ResultsThe osteogenic ability of BMMSCs in inflammatory environment was not significantly decreased compared with normal environment. The results of ELISA showed that the expression levels of IL-6, IL-8, IL-1β, TGF-β1 and TGF-β2 in inflammatory environment were higher than those in normal environment(P < 0.01). After the different cytokines were added to the normal environment, the expression levels of osteogenesis-related proteins in BMMSCs induced by TGF-β significantly increased. ConclusionsThe TGF-β1 secreted by BMMSCs in an inflammatory environment is mainly involved in the process of osteogenic differentiation. -
表 1 不同培养条件下BMMSCs内ALP、OCN、RUNX2蛋白表达的影响(x±s)
分组 n ALP OCN RUNX2 正常组 9 0.74±0.01 0.59±0.03 0.36±0.01 OM组 9 1.10±0.03* 1.19±0.03* 0.93±0.09* TNF-α组 9 0.68±0.03*# 0.54±0.02# 0.49±0.01*# TNF-α+OM组 9 1.34±0.04*#▲ 0.80±0.03*#▲ 0.68±0.01*#▲ F — 341.68 349.31 94.36 P — < 0.01 < 0.01 < 0.01 MS组内 — 0.001 0.001 0.002 q检验:与正常组比较*P < 0.05;与OM组比较#P < 0.05;与TNF-α组比较▲P < 0.05 表 2 TNF-α作用下BMMSCs上清液中各细胞因子浓度的表达(x±s;pg/mL)
分组 n IL-6 IL-8 IL-1β TGF-β1 TGF-β2 正常组 9 150.60±1.84 302.47±0.70 91.61±0.88 96.46±1.11 91.62±0.85 TNF-α组 9 192.88±2.03 358.33±2.02 130.42±1.79 254.67±2.03 180.94±1.36 t — 26.76 45.37 33.73 118.50 96.21 P — < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 表 3 分别加入不同细胞因子对不同组成骨相关蛋白相对表达量的影响(x±s)
分组 n ALP OCN RUNX2 正常组 9 0.63±0.03 0.35±0.04 0.67±0.02 IL-6组 9 0.61±0.03 0.85±0.04*# 0.81±0.04*# IL-8组 9 0.65±0.02 0.84±0.06*# 0.58±0.00*# IL-1β组 9 0.62±0.05 0.75±0.07*# 0.67±0.03*# TGF-β1组 9 0.84±0.03* 1.39±0.02* 0.87±0.03* TGF-β2组 9 1.05±0.08*# 0.95±0.03*# 0.73±0.02*# F — 46.88 154.77 41.79 P — < 0.01 < 0.01 < 0.01 MS组内 — 0.002 0.002 0.001 q检验:与正常组比较*P < 0.05;与TGF-β1组比较#P < 0.05 -
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