J Endod:牙本质中的神经生长因子及其对三叉神经的影响

2019-05-16 lishiting MedSci原创

牙齿形成过程中,过多的生物活性分子会在矿化牙本质基质中逐渐消失,并且能够在龋损脱矿处释放至牙髓组织中。然而,神经生长因子在牙本质形成的不同阶段其表达和分泌也有所不同。因此,这篇研究的目的是为了检测(1)它们在冠部和根部牙本质中的存在情况和含量以及(2)评估神经细胞中牙本质衍生蛋白的生物活性。

牙齿形成过程中,过多的生物活性分子会在矿化牙本质基质中逐渐消失,并且能够在龋损脱矿处释放至牙髓组织中。然而,神经生长因子在牙本质形成的不同阶段其表达和分泌也有所不同。因此,这篇研究的目的是为了检测(1)它们在冠部和根部牙本质中的存在情况和含量以及(2)评估神经细胞中牙本质衍生蛋白的生物活性。

研究从拔除的人健康第三磨牙中分别分离冠部和根部牙本质基质蛋白(DMPs)。定量分析生长因子和神经生长因子蛋白的总蛋白含量和浓度。在小鼠体外三叉神经和体内水凝胶植入模型中检测神经发生的影响。通过单细胞钙成像检测瞬时受体电位阳离子通道亚家族V成员1 (TRPV1)对施加DMP神经元的致敏作用。

神经营养分子相对浓度结果显示,在根部牙本质中,神经生长因子的表达增加3倍,是含量最多的神经营养因子。相似的,脑来源神经营养因子和神经营养因子3在根部的含量明显高于冠部。相反,胶质细胞来源神经营养因子在冠部牙本质中更多,而神经营养因子4的分布均等。牙本质基质蛋白在体外促进轴突生长并且在体内具有轴突靶向作用,在根部牙本质提取物中作用显著。此外,DMPs在小鼠三叉神经元中激活TRPV1反应,在根部牙本质提取物中活性显著。

结论:神经生长因子在冠部和根部牙本质中分布存在明显差异,并且牙本质来源蛋白对轴突生长和靶向作用以及对TRPV1的致敏作用也不尽相同。因此,牙本质基质中的细胞外蛋白很可能涉及龋病的神经源性反应,并且能够在临床牙髓再生中得以利用以促进神经移植和增强组织再生。

原始出处:

Widbiller M, Austah O, et al. Neurotrophic Proteins in Dentin and Their Effect on Trigeminal Sensory Neurons. J Endod. 2019 Apr 26. pii: S0099-2399(19)30157-8. doi: 10.1016/j.joen.2019.02.021.

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