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Methyl methacrylate

Company: Sigma-Aldrich
Catalog#: M55909-500 ml
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Testing Bone Formation Induction by Calvarial Injection Assay in vivo
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2020-03-20
[Abstract]  Bone formation occurs during embryogenesis, skeletal growth and during the process of skeletal renewal throughout life. In the process of bone formation, osteoblasts lay down a collagen-containing matrix, termed osteoid, which is gradually hardened by incorporation of mineral crystals. Although osteoblasts can be induced to differentiate and to deposit mineral in culture, this system does not always provide results that reflect the ability of agents to stimulate bone formation in vivo. This protocol describes a rapid and reliable method for testing local administration of agents on bone formation in vivo. In this method, mice are injected with the agent of question for 5 successive days. Fluorochrome labels are injected prior to, and after agents used for testing, and ... [摘要]  
[摘要 ] 骨骼形成发生在胚胎发生,骨骼生长以及整个生命的骨骼更新过程中。在骨形成过程中,成骨细胞沉积了一种含胶原蛋白的基质(称为类骨质),该基质通过掺入矿物质晶体而逐渐硬化。尽管可以诱导成骨细胞分化并在培养物中沉积矿物质,但该系统并不总是提供反映试剂在体内刺激骨骼形成能力的结果。该协议描述了一种快速可靠的方法,用于测试体内局部骨形成剂的局部给药。 在这种方法中,连续5天给小鼠注射相关药物。在用于测试的试剂之前和之后注射荧光染料标记,并通过未脱钙的骨组织学和组织形态计量术收集并分析样品。这提供了一种评估试剂刺激骨形成能力的可靠方法,如果使用短期修饰,也可以用于测试骨中对相同刺激的基因反应。

[背景 ] 骨形成是为骨架的发展所需的基本过程,对于骨骼生长的进展,并保持整个生命骨结构作为骨架不断重塑。骨形成是通过三个步骤发生的过程:(1)富含胶原的类骨质沉积,(2)通过在胶原纤维周围沉积生物磷灰石晶体而发生的类骨矿化,以及(3)矿化的骨质成熟(Blank and Sims ,2019)。这三个步骤由源自共同祖细胞的两种细胞类型介导。成骨细胞沉积类骨质并开始矿化,并且随着类骨质的沉积,一些成骨细胞被包埋在骨基质内并分化为骨细胞(Dallas and Bonewald ,2010)。这些嵌入的细胞还控制骨骼矿化的程度和性质(Vrahnas 等,2019)。 ...

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