Bone:GIT1通过调节PDGF-BB的前促细胞分泌促进成骨和成血管

2019-03-13 不详 网络

G蛋白偶联受体激酶2相互作用蛋白-1(GIT1)是一种支架蛋白,在骨生成和血管生成过程中的骨建模和重塑中起着至关重要的作用。最近的研究表明,CD31和Endomucin(CD31hiEmcnhi)强阳性的血管内皮特化子集与合成代谢骨形成相结合。基于我们先前的发现,GIT1敲除(GIT1 KO)小鼠血管生成和骨形成受损,我们假设GIT1影响CD31hiEmcnhi血管亚型的形成。本研究中,与野生型相

G蛋白偶联受体激酶2相互作用蛋白-1(GIT1)是一种支架蛋白,在骨生成和血管生成过程中的骨建模和重塑中起着至关重要的作用。最近的研究表明,CD31和Endomucin(CD31hiEmcnhi)强阳性的血管内皮特化子集与合成代谢骨形成相结合。基于我们先前的发现,GIT1敲除(GIT1 KO)小鼠血管生成和骨形成受损,我们假设GIT1影响CD31hiEmcnhi血管亚型的形成。

本研究中,与野生型相比,GIT1敲除(GIT1 KO)小鼠的骨小梁质量和CD31hiEmcnhi血管数明显减少。在骨折愈合小鼠模型中,与野生型小鼠相比,GIT1 KO小鼠在第7天和第14天在骨折愈伤组织中含有较少数量的CD31hiEmcnhi血管。然而,研究人员观察到GIT1 KO小鼠中骨髓、骨小梁和愈伤组织中的前破骨细胞数量没有显著差异。值得注意的是,GIT1 KO小鼠中由与CD31hiEmcnhi血管形成相关的前促细胞分泌的血清血小板衍生生长因子-BB(PDGF-BB)的浓度较低。此外,PDIT-BB相关的磷酸化细胞外信号调节激酶-1/2(ERK1/2)和特异性蛋白1(SP1)的表达在GIT1 KO小鼠的前促细胞中显著降低。

总之,这些结果都表明GIT1是CD31hiEmcnhi血管亚型形成的关键参与者,突出了这种支架蛋白在前促细胞中的新生物学功能。

原始出处:

Xu T, Luo Y, et al., GIT1 is critical for formation of the CD31hiEmcnhi vessel subtype in coupling osteogenesis with angiogenesis via modulating preosteoclasts secretion of PDGF-BB. Bone. 2019 Mar 7. pii: S8756-3282(19)30082-1. doi: 10.1016/j.bone.2019.03.006.

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    2019-08-16 gwc392
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    2019-10-21 apoenzyme
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    2019-03-15 zhaojie88