摘要
背景:小鼠成骨能力受到JAK/STAT通路的调控,白细胞介素9能够通过JAK-STAT通路调控多种细胞的功能,有潜力成为调控成骨能力的新型细胞因子。目的:探究体内白细胞介素9的缺失对于小鼠成骨能力的影响。方法:将2月龄野生型小鼠(WT)和白细胞介素9基因全敲除小鼠(IL-9^(-/-))股骨进行Micro-CT扫描,分析其骨量变化;并分别对小鼠股骨切片行苏木精-伊红染色、Masson染色以及Ⅰ型胶原蛋白免疫组化染色。提取2月龄WT和IL-9^(-/-)小鼠骨髓细胞进行骨髓间充质干细胞克隆形成实验,并检测成骨基因的表达。为了进一步验证白细胞介素9是否通过JAK-STAT通路进行信号传导,采用Westernblot检测STAT3蛋白的表达。结果与结论:①Micro-CT扫描结果显示,相较于WT小鼠,IL-9^(-/-)小鼠的骨量显著降低,骨密度、骨体积分数、骨小梁数目显著降低,骨小梁分离度显著增大;②苏木精-伊红染色与Micro-CT结果一致,IL-9^(-/-)小鼠骨小梁密度更低;③Ⅰ型胶原蛋白免疫组化染色以及Masson染色结果显示,IL-9^(-/-)小鼠Ⅰ型胶原蛋白阳性成骨细胞数量显著减少,同时胶原形成能力更差;④克隆形成实验结果表明,IL-9^(-/-)小鼠成骨细胞的矿化能力显著低于WT小鼠;⑤Western blot结果显示,成骨诱导激活STAT3信号传导,WT成骨诱导组pSTAT3表达明显高于IL-9^(-/-)成骨诱导组,说明白细胞介素9通过JAK-STAT3通路调控成骨,白细胞介素9的缺失抑制成骨细胞的分化与功能,这可能是IL-9^(-/-)小鼠骨量降低的原因之一。
BACKGROUND:Mouse osteogenic potential is regulated by the JAK-STAT signaling pathway,and interleukin-9 can regulate multiple cellular functions through the JAK-STAT pathway,which has the potential to be a novel cytokine that regulates osteogenic potential.OBJECTIVE:To investigate the effect of interleukin-9 deficiency on osteogenic potential in mice METHODS:The femurs collected from 2-month-old wild-type and interleukin-9 knockout mice were subjected to Micro-CT scanning to analyze the changes in bone mass.Then,hematoxylin-eosin staining,Masson staining,and immunohistochemical staining of type I collagen were performed on the slices of the femurs of mice.Bone marrow cells from 2-month-old wild-type and interleukin-9 knockout mice were extracted for colony-forming assay and detection of osteogenic gene expression in bone marrow mesenchymal stem cells.To further verify whether interleukin-9 worked through the JAK-STAT pathway,the expression of STAT3 protein was detected by western blot.RESULTS AND CONCLUSION:Micro-CT results showed the bone mass of interleukin-9 knockout mice decreased significantly compared with that of wild-type mice.In addition,the bone mineral density,bone volume fraction,trabecular number significantly decreased and trabecular separation markedly escalated in interleukin-9 knockout mice.The findings of hematoxylin-eosin staining were consistent with Micro-CT results.Interleukin-9 knockout mice had lower bone trabecular density.Type I collagen immunohistochemistry staining and Masson staining indicated the number of type I collagen positive osteoblasts was significantly reduced and the capacity of collagen formation was damaged in interleukin-9 knockout mice.The results of colony-forming assay indicated that the mineralization capacity of osteoblast in interleukin-9 knockout mice were significantly lower than that in wild-type mice.Western blot results showed that osteogenesis induction activated STAT3 signaling,and the pSTAT3 level in wild-type mice with osteogenic induction was significantly
作者
王怡
陈迟迟
周熙超
施勤
Wang Yi;Chen Chichi;Zhou Xichao;Shi Qin(Department of Orthopedics,the First Affiliated Hospital of Soochow University,Institute of Orthopedics of Soochow University,Suzhou 215006,Jiangsu Province,China)
出处
《中国组织工程研究》
CAS
北大核心
2024年第26期4178-4183,共6页
Chinese Journal of Tissue Engineering Research
基金
国家自然科学基金面上项目(81972059),项目负责人:施勤。
关键词
白细胞介素9
骨质疏松
间充质干细胞
成骨能力
成骨诱导
成骨矿化
interleukin-9
osteoporosis
mesenchymal stem cell
osteogenic capability
osteogenic induction
osteogenic mineralization
