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首页> 外文期刊>Journal of Cellular Physiology >Changes in secreted and cell associated proteoglycan synthesis during conversion of myoblasts to osteoblasts in response to bone morphogenetic protein-2: role of decorin in cell response to BMP-2.
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Changes in secreted and cell associated proteoglycan synthesis during conversion of myoblasts to osteoblasts in response to bone morphogenetic protein-2: role of decorin in cell response to BMP-2.

机译:相关的分泌和细胞的变化在转换的蛋白合成成骨细胞在骨肌母细胞形态形成protein-2: decorin在细胞中的作用应对BMP-2。

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Proteoglycans have been identified within the extracellular matrices (ECM) of bone and are known to play a role in ECM assembly, mineralization, and bone formation. Bone morphogenetic protein-2 (BMP-2) specifically converts the differentiation pathway of C2C12 myoblasts into that of osteoblast lineage cells. Microarray analyses of the mouse myoblast cell line C2C12 and its differentiation into osteoblastic cells in response to BMP-2 have suggested the up-regulation of several proteoglycan species, although there is a lack of biochemical evidence for this response. In this study we have biochemically analyzed and characterized the proteoglycan populations that are induced in C2C12 cells upon osteoblastic differentiation produced by BMP-2. An important and specific increase in the synthesis of secreted decorin was observed in BMP-2-treated cells, as compared to untreated myoblasts and myoblasts induced to differentiate into myotubes. Decorin was seen to contain larger glycosaminoglycan (GAG) chains in induced than in non-induced cells. BMP-2 also produced an augment in the synthesis of different heparan sulfate proteoglycans such syndecan-2, - 3, glypican, and perlecan in detergent-soluble and non-soluble cellular fractions. We also examined whether the evident changes induced by BMP-2 in secreted decorin could have a functional role. BMP-2 signaling dependent as well as induction of alkaline phosphatase (ALP) activity was diminished in decorin null myoblasts compared to wild type myoblats although cell surface level of BPM-2 receptors was unchanged. These results are the first biochemical evidence and analysis for the effect of BMP-2 on the synthesis of proteoglycan during osteogenic conversion of myoblasts and suggest a role for decorin in cell response to BMP-2.
机译:蛋白聚糖内已确定细胞外基质(ECM)的骨骼和在ECM装配中发挥作用,矿化和骨形成。形态形成protein-2 (BMP-2)转换C2C12分化途径成肌细胞,成骨细胞谱系的细胞。微阵列分析小鼠成肌细胞的细胞行C2C12及其分化在应对BMP-2成骨细胞的细胞建议几个的老年病蛋白聚糖的物种,尽管缺乏生化反应的证据。研究分析和生化反应的蛋白多糖的种群特征在C2C12细胞在诱导成骨细胞的由BMP-2产生分化。和具体的合成增加分泌decorin BMP-2-treated观察比未经处理的细胞,成肌细胞成肌细胞诱导分化成肌管。Decorin被认为含有更大粘多糖(GAG)在诱导链non-induced细胞。在不同的硫酸乙酰肝素的合成glypican syndecan-2等蛋白聚糖- 3,perlecan detergent-soluble non-soluble细胞分数。BMP-2诱导的分泌明显变化decorin有功能的作用。信号依赖的感应碱性磷酸酶(ALP)活性减少在decorin零肌母细胞相比野生型myoblats虽然细胞表面的水平BPM-2受体持平。第一生化证据和分析BMP-2在合成的影响蛋白多糖在成骨的转换成肌细胞并建议decorin在细胞的作用应对BMP-2。

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