Osteoblasts secrete Cxcl9 to regulate angiogenesis in bone.

Osteoblasts secrete Cxcl9 to regulate angiogenesis in bone.
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成骨细胞分泌 Cxcl9 来调节骨中的血管生成。

DOI:
10.1038/ncomms13885
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发表时间:
2016-12-14
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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成骨细胞和内皮细胞之间的通讯是骨转换的关键,但这种通讯的分子机制还没有很好的定义。在这里,我们确定Cxcl9作为成骨细胞在骨髓微环境中分泌的血管生成抑制因子。我们表明,Cxcl9产生的成骨细胞与血管内皮生长因子相互作用,并防止其结合到内皮细胞和成骨细胞,从而废除血管生成和成骨在小鼠骨和体外。雷帕霉素复合物1的机制靶标通过转录上调STAT 1激活Cxcl9表达,并增加成骨细胞中STAT 1与Cxcl9启动子的结合。这些发现揭示了成骨细胞产生的Cxcl9在骨中的血管生成和骨生成中的重要作用,并且Cxcl9可以被靶向以提高骨血管生成和预防骨丢失相关疾病。 骨发育和血管化是共同的许多分子机制的耦合事件。在这里,作者鉴定成骨细胞分泌的Cxcl9作为血管生成和骨生成的抑制性调节剂,并表明mTORC 1信号传导和STAT 1是细胞因子表达的关键上游介质。
Communication between osteoblasts and endothelial cells (ECs) is essential for bone turnover, but the molecular mechanisms of such communication are not well defined. Here we identify Cxcl9 as an angiostatic factor secreted by osteoblasts in the bone marrow microenvironment. We show that Cxcl9 produced by osteoblasts interacts with vascular endothelial growth factor and prevents its binding to ECs and osteoblasts, thus abrogating angiogenesis and osteogenesis both in mouse bone and in vitro. The mechanistic target of rapamycin complex 1 activates Cxcl9 expression by transcriptional upregulation of STAT1 and increases binding of STAT1 to the Cxcl9 promoter in osteoblasts. These findings reveal the essential role of osteoblast-produced Cxcl9 in angiogenesis and osteogenesis in bone, and Cxcl9 can be targeted to elevate bone angiogenesis and prevent bone loss-related diseases. Bone development and vascularization are coupled events that share many molecular mechanisms. Here the authors identify osteoblast-secreted Cxcl9 as an inhibitory regulator of angiogenesis and osteogenesis, and show that mTORC1 signaling and STAT1 are critical upstream mediators of the cytokine expression.
短暂干扰RNA对STAT1的干扰可通过抑制炎症来减弱顺铂诱导的大鼠耳毒性。
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