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Molecular Aspect of Osteoporotic Fracture Healing

机译:骨质疏松性骨折愈合的分子方面

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Protein expression of growth factors involved in fracture healing and osteoporosis were investigated in ovariectomised (OVX) rat fracture model using histological and immunohistochemical analysis. The OVX model was confirmed by a significantly increased body weight and reduced bone density of the non-fracture hind limbs. The tissue morphology and the protein expression were assessed on the paraffin sections of the fracture callus at day 7, 14, 28 and 42 after fracture. Histology revealed a significantly higher ratio of fibrous tissue over bone or cartilage over bone in the fracture callus at day 28 and 42 in the OVX rats than in the normal rats. Immunohistochemical staining of IGF-I, IGF-IRα, MMP-1, TIMP-1 and 2 showed a different pattern between the OVX and the control groups. A down-regulation of IGF-I and TIMP-1 and an up-regulation of MMP-1 were observed in OVX rats, which may account in part for the delayed healing of the osteoporotic fracture and may affect extracellular matrix composition, an important determinant of callus strength.
机译:使用组织学和免疫组织化学分析方法,在卵巢切除(OVX)大鼠骨折模型中研究了参与骨折愈合和骨质疏松的生长因子的蛋白表达。 OVX模型通过体重显着增加和非骨折后肢骨密度降低而得到证实。在骨折后第7、14、28和42天,在骨折call的石蜡切片上评估组织形态和蛋白质表达。组织学显示在OVX大鼠中,在第28天和第42天,在骨折call中的纤维组织占骨的比例或软骨占骨的比例明显高于正常大鼠。 IGF-1,IGF-1Ra,MMP-1,TIMP-1和2的免疫组织化学染色显示OVX与对照组之间的模式不同。在OVX大鼠中观察到IGF-I和TIMP-1的下调以及MMP-1的上调,这可能部分解释了骨质疏松性骨折的延迟愈合,并可能影响细胞外基质的组成,这是一个重要的决定因素愈伤组织强度。

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