J Endod:神经生长因子在人牙本质中的表达及对三叉神经突生长的调控

2019-03-15 lishiting MedSci原创

神经生长因子在器官发生过程及之后的牙髓牙本质复合体神经分布中发挥着重要作用。在牙本质细胞外基质中发现多种生物活性分子;然而,牙本质基质中的神经生长因子表达及它们的生物学活性还未可知。这篇研究的目的是为了鉴定人牙本质基质蛋白(DMPs)中神经生长因子的相对表达以及对三叉神经元(TG)轴突生长的影响。

神经生长因子在器官发生过程及之后的牙髓牙本质复合体神经分布中发挥着重要作用。在牙本质细胞外基质中发现多种生物活性分子;然而,牙本质基质中的神经生长因子表达及它们的生物学活性还未可知。这篇研究的目的是为了鉴定人牙本质基质蛋白(DMPs)中神经生长因子的相对表达以及对三叉神经元(TG)轴突生长的影响。

将人非龋第三磨牙来源的牙本质在液氮中研磨成粉末。DMPs通过EDTA提取法溶解、透析和冻干以备后用。通过酶联免疫吸附测定检测神经生长因子、脑源性神经营养因子、神经胶质细胞来源的神经营养因子、神经营养因子3和神经营养因子4/5的相对表达量。体外培养大鼠TG神经元,并施以不同浓度的DMPs (1-105 ng/mL)刺激或对照,进行轴突生长的定量评估。

结果显示,人DMPs 含有所有测试的神经营养因子,神经胶质细胞来源的神经营养因子和神经营养因子4/5表达量最高。DMPs浓度在10-102 ng/mL能够促进大鼠TG神经元轴突生长,而在较高浓度其作用会被部分抑制(>103 ng/mL)。

结论:人牙本质细胞外基质是神经营养因子的富饶存储器,是神经元动态平衡、分化和再生的核心组成。这些结果表明,DMPs中的神经营养素作为信号分子在牙齿形成、修复和再生过程中对牙髓牙本质复合体神经分布起到重要作用。

原始出处:

Austah O, Widbiller M, et al. Expression of Neurotrophic Factors in Human Dentin and Their Regulation of Trigeminal Neurite Outgrowth. J Endod. 2019 Feb 13. pii: S0099-2399(18)30870-7. doi: 10.1016/j.joen.2018.12.011.

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