Int Endod J:VEGF通过调节赖氨酰氧化酶的表达诱导人牙髓细胞的分化和血管发生

2017-06-21 lishiting MedSci原创

这篇研究是为了评估重组人血管内皮生长因子(rhVEGF)对人牙髓细胞(HDPCs)的成牙本质分化、体外血管发生以及赖氨酰氧化酶(LOX)活性和表达的影响,并与rhFGF-2相比较。同时,探讨其潜在的分子机制。另外,研究重点关注LOX是否参与调控rhVEGF对HDPCs的作用。

这篇研究是为了评估重组人血管内皮生长因子(rhVEGF)对人牙髓细胞(HDPCs)的成牙本质分化、体外血管发生以及赖氨酰氧化酶(LOX)活性和表达的影响,并与rhFGF-2相比较。同时,探讨其潜在的分子机制。另外,研究重点关注LOX是否参与调控rhVEGF对HDPCs的作用。

rhVEGF是通过提取大肠杆菌内的pBAD-HisA质粒构建获得。HDPCs 施加1-50 μg mL-1 rhVEGF刺激14天。在诱导HDPCs成牙本质分化后,检测碱性磷酸酶(ALP)活性,茜素红染色观察矿化结节形成情况。逆转录聚合酶链式反应检测成牙本质分化标志物的表达水平变化。Western blot和免疫细胞化学检测信号通路活性。实验数据通过方差分析和Bonferroni's检验进行统计学分析(α = 0.05)。

结果显示,与rhFGF-2相比较,rhVEGF明显促进细胞增殖(P < 0.05)、ALP(P < 0.05)活性以及矿化结节形成,并且显著上调成骨/成牙本质分化标志物的mRNA表达水平。 同时,rhVEGF明显增强胺氧化酶活性(P < 0.05),并且促进HDPCs中LOX和LOXL的mRNA表达水平。另外,rhVEGF以剂量依赖的形式上调血管发生相关基因mRNA表达,并且比rhFGF-2更大程度的促进毛细管形成。使用β氨基丙腈(BAPN)抑制LOX,和通过RNA干扰沉默LOX或LOXL基因均可明显抑制 rhVEGF诱导的细胞生长、ALP活性、标志物mRNA表达水平以及体外的血管生成。此外,施加rhVEGF可以促使Akt, ERK, JNK和p38的磷酸化, 激活NF-κB。但是,沉默LOX或LOXL基因和施加BAPN刺激会抑制各信号因子活性。

结论:rhVEGF可以通过调节LOX表达促进细胞生长、成牙本质分化潜力以及体外的血管发生。这些结果支持一种理念:rhVEGF可能会为牙髓再生提供一项新的治疗方案。

原始出处:

Bae WJ, Yi JK, et al. Lysyl oxidase-mediated VEGF-induced differentiation and angiogenesis in human dental pulp cells. Int Endod J. 2017 Jun 1. doi: 10.1111/iej.12796.

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    2017-06-26 mnda
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    2017-12-24 jxrzshh
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    2017-06-23 chengjn
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    2017-06-22 龙胆草

    学习谢谢分享

    0

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    2017-06-21 中医痴

    不错的,学习了,谢谢分享!

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    2017-06-21 三生有幸9135

    学习一下谢谢分享

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