人骨关节炎软骨细胞上调成骨细胞中骨保护素的作用途径  

Human osteoarthritic chondrocytes up-regulate the expression of osteoprotegerin in osteoblasts via the Indian hedgehog signaling pathway

作　　者：李家乐 罗达胜 郑刘杰 刘伟 姚运峰[1] Li Jiale;Luo Dasheng;Zheng Liujie;Liu Wei;Yao Yunfeng(The Second Hospital of Anhui Medical University,Hefei 230601,Anhui Province,China;Fuyang Hospital of Anhui Medical University,Fuyang 236000,Anhui Province,China)

机构地区：[1]安徽医科大学第二附属医院,安徽省合肥市230601 [2]安徽医科大学附属阜阳医院,安徽省阜阳市236000

出　　处：《中国组织工程研究》2024年第26期4194-4201,共8页Chinese Journal of Tissue Engineering Research

基　　金：安徽省自然科学基金项目(1608085MH167),项目负责人:姚运峰。

摘　　要：背景:研究发现上调的刺猬蛋白信号将导致骨关节炎标志物蛇毒蛋白Runx2、聚蛋白多糖酶5、COL10A1以及基质金属蛋白酶13的升高,而抑制刺猬蛋白能减轻骨关节炎的严重程度。猜测骨关节炎软骨细胞能够通过印度刺猬蛋白(Indian hedgehog protein,IHH)信号通路影响成骨细胞来影响骨的形成。目的:探索人骨关节炎软骨细胞对软骨下成骨细胞的影响。方法:收集骨关节炎患者的胫骨平台标本,使用酶解法提取软骨细胞,利用酶预消化+骨块法提取成骨细胞。采用甲苯胺蓝染色和免疫荧光鉴定软骨细胞;采用碱性磷酸酶染色和免疫荧光鉴定成骨细胞,在海藻酸钠珠中以维持软骨细胞表型,将其与成骨细胞共培养,共培养系统中分别加入IHH信号通路的抑制剂(Cyclopamine,10 nmol/L)和激活剂(Purmorphamine,10 nmol/L),48 h后收集各组成骨细胞,利用qRT-PCR检测成骨细胞中Gli1、骨保护素、Runx2、甲状旁腺激素相关肽、碱性磷酸酶、核因子κB受体活化因子配体(receptor activator of NF-kBligand,RANKL)以及骨钙素等基因mRNA的表达;利用Westernblot检测各处理组的成骨细胞中GLi1、骨保护素、RANKL蛋白的表达。结果与结论:①与骨关节炎软骨细胞共同培养时,成骨细胞中GLi1、骨保护素、RUNX2的mRNA表达水平明显增加,而甲状旁腺激素相关肽的mRNA表达水平相对降低(P<0.05);加入IHH抑制剂(Cyclopamine)后,IHH信号通路目的基因Gli1在mRNA和蛋白水平上表达均明显降低(P<0.05),加入IHH信号通路激活剂(Purmorphamine)后,Gli1在mRNA及蛋白水平上表达均明显升高(P<0.05);骨保护素在实验中表现出与Gli1相同的变化趋势。②成骨细胞骨保护素/RANKL比值测定结果显示,与骨保护素的趋势相同。③结果表明,人骨关节炎软骨细胞能够促进成骨细胞中Gli1、骨保护素、Runx2等蛋白的表达;其中骨保护素的上调与IHH信号通路相关;骨关节炎软骨细胞能够通过IBACKGROUND:Upregulation of hedgehog protein signaling can increase the expression of osteoarthritis markers,Runx2,a disintegrin and metalloproteinase with thrombospondin motifs,collagen type X alpha 1,and matrix metalloproteinase 13,while inhibition of hedgehog proteins attenuates the severity of osteoarthritis.It is speculated that osteoarthritic chondrocytes can influence bone formation by affecting osteoblasts through the Indian hedgehog protein(IHH)signaling pathway.OBJECTIVE:To investigate the effect of human osteoarthritic chondrocytes on subchondral osteoblasts.METHODS:Tibial plateau specimens from patients with osteoarthritis were collected.Chondrocytes were extracted using enzymatic digestion,and osteoblasts were extracted using enzymatic pre-digestion+bone block method.Chondrocytes were identified by toluidine blue staining and immunofluorescence and osteoblasts were identified by alkaline phosphatase staining and immunofluorescence.Chondrocytes were cultured in sodium alginate beads to maintain chondrocyte phenotype and co-cultured with osteoblasts.The co-culture system was added with IHH signaling pathway inhibitor(cyclopamine,10 nmol/L)and activator(purmorphamine,10 nmol/L)separately.After 48 hours of co-culture,osteoblasts from each group were collected,mRNA expressions of Gli1,osteoprotegerin,Runx2,parathyroid hormone-related peptide,alkaline phosphatase,receptor activator of nuclear factor-kB ligand(RANKL)and osteocalcin were detected by qRT-PCR,and protein expressions of GLi1,oseoprotegerin and RANKL in osteoblasts were detected by western blot.RESULTS AND CONCLUSION:The mRNA expression levels of GLi1,osteoprotegerin and RUNX2 in osteoblasts were significantly increased,while the mRNA expression levels of parathyroid hormone-related peptide were decreased(P<0.05)when co-cultured with human osteoarthritic chondrocytes.The mRNA and protein levels of Gli1 were significantly decreased after the addition of IHH signaling pathway inhibitor(cyclopamine)(P<0.05),and the mRNA and protein levels of Gli1 we

关 键 词：骨关节炎 成骨细胞 软骨细胞 印度刺猬信号通路 骨保护素 核因子ΚB受体活化因子配体 

分 类 号：R496[医药卫生—康复医学] R318[医药卫生—临床医学] R681