Runx2 is a major regulator of osteoblast differentiation and function;however,the role of Runx2 in peripheral nerve repair is unclea r.Here,we analyzed Runx2expression following injury and found that it was specifical...Runx2 is a major regulator of osteoblast differentiation and function;however,the role of Runx2 in peripheral nerve repair is unclea r.Here,we analyzed Runx2expression following injury and found that it was specifically up-regulated in Schwann cells.Furthermore,using Schwann cell-specific Runx2 knocko ut mice,we studied peripheral nerve development and regeneration and found that multiple steps in the regeneration process following sciatic nerve injury were Runx2-dependent.Changes observed in Runx2 knoc kout mice include increased prolife ration of Schwann cells,impaired Schwann cell migration and axonal regrowth,reduced re-myelination of axo ns,and a block in macrophage clearance in the late stage of regeneration.Taken together,our findings indicate that Runx2 is a key regulator of Schwann cell plasticity,and therefore peripheral nerve repair.Thus,our study shows that Runx2 plays a major role in Schwann cell migration,re-myelination,and peripheral nerve functional recovery following injury.展开更多
目的:探讨肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)对人脱落乳牙牙髓干细胞(stem cells from human exfoliated deciduous teeth,SHED)骨分化能力的影响,分析ERK1/2-Runx2信号通路在该调控过程中的变化。方法:从6~8岁健康儿童...目的:探讨肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)对人脱落乳牙牙髓干细胞(stem cells from human exfoliated deciduous teeth,SHED)骨分化能力的影响,分析ERK1/2-Runx2信号通路在该调控过程中的变化。方法:从6~8岁健康儿童正常乳恒牙替换即将脱落的乳切牙中分离和培养SHED,取第三代细胞,分为对照组(成骨诱导剂培养)、观察组(成骨诱导剂和TNF-α共培养)和激动剂组(成骨诱导剂、TNF-α和ERK通路激动剂共培养)。采用茜素红染色评价成骨分化功能,采用Western印迹检测SHED细胞中Osterix、OPN、ERK1/2、pERK1/2和Runx2的蛋白表达水平,应用qRT-PCR检测Osterix、OPN、ERK1/2、pERK1/2和Runx2 mRNA的表达。采用SPSS 26.0软件包对数据进行统计学分析。结果:3组细胞成骨分化能力比较结果显示,3组细胞中均可见红棕色矿化结节。3组组间相比,对照组矿化结节最多,激动剂组次之,观察组最少。与对照组相比,观察组和激动剂组的Osterix、OPN蛋白和mRNA表达水平显著下降,而激动剂组Osterix、OPN蛋白和mRNA表达水平显著高于观察组;3组细胞的ERK1/2蛋白和mRNA表达水平无显著差异,而观察组和激动剂组pERK1/2和Runx2的蛋白和mRNA表达水平显著高于对照组,激动剂组的蛋白及mRNA表达水平显著高于观察组。结论:TNF-α对SHED成骨分化具有抑制作用,该作用可能与抑制ERK1/2-Runx2信号通路有关。展开更多
目的基于骨组织Runx2、Osterix启动子甲基化水平,探究鹿茸中药复方对去卵巢骨质疏松症大鼠的疗效机制。方法去卵巢复制绝经后骨质疏松症(Postmenopausal Osteoporosis,PMOP)大鼠模型,将其分4组,分别为:正常组、模型组、鹿茸中药复方组...目的基于骨组织Runx2、Osterix启动子甲基化水平,探究鹿茸中药复方对去卵巢骨质疏松症大鼠的疗效机制。方法去卵巢复制绝经后骨质疏松症(Postmenopausal Osteoporosis,PMOP)大鼠模型,将其分4组,分别为:正常组、模型组、鹿茸中药复方组、仙灵骨葆阳性对照组。灌胃14周后,X射线吸收测量法检测骨密度、质谱法检测Runx2、Osterix启动子甲基化水平。结果(1)与正常组比较,模型组第1~6腰椎骨密度明显降低(P<0.01);骨组织Runx2启动子-955 bp^-456 bp CpG1、CpG2甲基化水平明显升高(P<0.05);骨组织Osterix启动子-1082 bp^-583 bp CpG1、CpG2甲基化水平明显升高(P<0.01)。(2)与模型组比较,鹿茸中药复方组、仙灵骨葆阳性对照组第1~6腰椎骨密度明显升高(P<0.05);鹿茸中药复方组骨组织Runx2启动子-955 bp^-456 bp CpG1、CpG3甲基化水平明显降低(P<0.05),Osterix启动子-1082 bp^-583bp CpG1甲基化水平明显降低(P<0.05);仙灵骨葆阳性对照组骨组织Runx2启动子-955 bp^-456 bp CpG1、CpG2甲基化水平明显降低(P<0.05),Osterix启动子-1082 bp^-583 bp CpG1、CpG2甲基化水平明显降低(P<0.01)。结论鹿茸中药复方通过降低骨组织Runx2、Osterix启动子甲基化水平的表观遗传学机制,有效防治PMOP。展开更多
基金supported by the National Natural Science Foundation of China,No.82104795 (to RH)。
文摘Runx2 is a major regulator of osteoblast differentiation and function;however,the role of Runx2 in peripheral nerve repair is unclea r.Here,we analyzed Runx2expression following injury and found that it was specifically up-regulated in Schwann cells.Furthermore,using Schwann cell-specific Runx2 knocko ut mice,we studied peripheral nerve development and regeneration and found that multiple steps in the regeneration process following sciatic nerve injury were Runx2-dependent.Changes observed in Runx2 knoc kout mice include increased prolife ration of Schwann cells,impaired Schwann cell migration and axonal regrowth,reduced re-myelination of axo ns,and a block in macrophage clearance in the late stage of regeneration.Taken together,our findings indicate that Runx2 is a key regulator of Schwann cell plasticity,and therefore peripheral nerve repair.Thus,our study shows that Runx2 plays a major role in Schwann cell migration,re-myelination,and peripheral nerve functional recovery following injury.
文摘目的基于骨组织Runx2、Osterix启动子甲基化水平,探究鹿茸中药复方对去卵巢骨质疏松症大鼠的疗效机制。方法去卵巢复制绝经后骨质疏松症(Postmenopausal Osteoporosis,PMOP)大鼠模型,将其分4组,分别为:正常组、模型组、鹿茸中药复方组、仙灵骨葆阳性对照组。灌胃14周后,X射线吸收测量法检测骨密度、质谱法检测Runx2、Osterix启动子甲基化水平。结果(1)与正常组比较,模型组第1~6腰椎骨密度明显降低(P<0.01);骨组织Runx2启动子-955 bp^-456 bp CpG1、CpG2甲基化水平明显升高(P<0.05);骨组织Osterix启动子-1082 bp^-583 bp CpG1、CpG2甲基化水平明显升高(P<0.01)。(2)与模型组比较,鹿茸中药复方组、仙灵骨葆阳性对照组第1~6腰椎骨密度明显升高(P<0.05);鹿茸中药复方组骨组织Runx2启动子-955 bp^-456 bp CpG1、CpG3甲基化水平明显降低(P<0.05),Osterix启动子-1082 bp^-583bp CpG1甲基化水平明显降低(P<0.05);仙灵骨葆阳性对照组骨组织Runx2启动子-955 bp^-456 bp CpG1、CpG2甲基化水平明显降低(P<0.05),Osterix启动子-1082 bp^-583 bp CpG1、CpG2甲基化水平明显降低(P<0.01)。结论鹿茸中药复方通过降低骨组织Runx2、Osterix启动子甲基化水平的表观遗传学机制,有效防治PMOP。
