J Cell Physiol:地塞米松通过改变IGF-1介导的血管生成干扰成骨过程中成骨细胞的形成

2019-01-25 MedSci MedSci原创

地塞米松(Dex)是一种具有长效治疗作用的合成糖皮质激素(GC),已证明对胚胎成骨过程中的成骨细胞增殖和分化具有调节作用。然而,如果Dex暴露影响软骨内骨化及其潜在机制,仍存在争议。在该研究中,利用体内鸡胚和体外成胚细胞培养物来研究Dex对骨骼发育过程中成骨细胞形成和分化的影响。我们首次证明了Dex暴露可以缩短体内17天鸡胚的长骨,并且还可以下调成骨相关基因的表达。接下来,我们确定Dex暴露抑制前

地塞米松(Dex)是一种具有长效治疗作用的合成糖皮质激素(GC),已证明对胚胎成骨过程中的成骨细胞增殖和分化具有调节作用。然而,如果Dex暴露影响软骨内骨化及其潜在机制,仍存在争议。在该研究中,利用体内鸡胚和体外成胚细胞培养物来研究Dex对骨骼发育过程中成骨细胞形成和分化的影响。

我们首次证明了Dex暴露可以缩短体内17天鸡胚的长骨,并且还可以下调成骨相关基因的表达。接下来,我们确定Dex暴露抑制前成骨细胞-MC3TC-E1细胞的增殖和活力,并且添加胰岛素样生长因子1(IGF-1)可以显著挽救这些负面影响。在挽救实验的显著变化的基础上,我们接下来通过在Dulbecco改良的Eagle培养基培养中或在鸡胚绒毛尿囊膜(CAM)上培养分离的胚胎趾骨来证实血管生成在成骨中的重要作用。然后,我们将MC3T3-E1细胞块移植到CAM上。数据显示,Dex暴露降低了发育细胞团内的血管密度,同时伴随IGF-1通路的下调。我们证实了使用CAM血管生成模型通过IGF-1治疗可以挽救由Dex引起的血管形成的抑制。最后,我们证明了在Dex存在下缩短的指骨长度可以通过添加IGF-1来逆转。

总之,这些发现表明,由Dex暴露引起的Igf-1信号的抑制对成骨细胞的形成和血管生成产生不利影响,因此在成骨过程中缩短了长骨。

原始出处:

Xu S, Guo R, et al., Dexamethasone interferes with osteoblasts formation during osteogenesis through altering IGF-1-mediated angiogenesis. J Cell Physiol. 2019 Jan 22. doi: 10.1002/jcp.28157.

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    2019-04-20 维他命
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    2019-12-13 qingrejiedu
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    2019-08-03 仁医06
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    2019-01-29 清风拂面

    谢谢分享学习

    0

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    2019-01-27 zhaojie88
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