中国实用口腔科杂志

• 口腔颌面部组织再生专栏 • 上一篇    下一篇

脱落乳牙牙髓干细胞聚合体再生牙髓实验研究

张宇1郭皓2何小宁1轩昆1李蓓1   

  1. 1. 军事口腔医学国家重点实验室,第四军医大学口腔医学院组织工程研发中心,陕西  西安  710032;2.兰州军区西安军职以上退休干部休养所,陕西  西安  710061
  • 出版日期:2016-12-15 发布日期:2017-01-17
  • 基金资助:

    国家自然科学基金青年项目(31501121,81501885);陕西省青年人才项目(2016JQ8019)

  • Online:2016-12-15 Published:2017-01-17

摘要:

目的    利用动物实验模型证明使用小型猪脱落乳牙牙髓干细胞(stem cells from minipig exfoliated deciduous teeth, SPED)聚合体进行原位牙髓再生的可行性。方法    分离和培养SPED,检测和分析其细胞生物学行为,进而诱导制备SPED聚合体;建立年轻恒牙牙髓坏死的小型猪动物模型,设置SPED聚合体再生组和传统根尖诱导成形治疗组;术后4个月进行常规组织学取材,利用HE、免疫荧光染色等方法观察牙髓再生和牙根尖形成情况。结果    SPED聚合体再生组受试牙齿组织学HE染色检测发现,牙根继续发育并形成正常的根尖形态,此外全长根管内可见类牙髓结构的再生组织,免疫荧光染色可见组织中CGRP、TRPV1、TRPM8表达阳性细胞的规则分布;而传统根尖诱导成形治疗组受试牙齿仅在根管内形成不规则的钙化组织,未见牙髓组织形成。结论    SPED聚合体在小型猪体内可以实现牙髓再生,同时再生牙髓具有正常组织学形态,而且具有牙本质形成和诱导根尖形成的生理功能。

关键词: 人脱落乳牙牙髓干细胞, 细胞聚合体, 牙髓再生

Abstract:

Objective    To regenerate dental pulp in animal experimental model by using dental pulp stem cells from minipig exfoliated deciduous teeth (SPED). Methods    Separate the deciduous dental pulp stem cells of Mini-Pig. Analyze the biological properties of SPED and prepare the cell aggregate of SPED. Establish the experimental animal model of young permanent teeth with dental pulp necrosis. The animals were divided to SPED Aggregate Regeneration Group and Traditional Induced Root Apex Formation Group. HE and immunofluorescence staining were used to observe dental pulp regeneration and root apex formation after 4 months. Results    SPED aggregates regenerated dental pulp and promote the root development. Immunofluorescence staining showed positive expression of CGRP, TRPV1, TRPM8 in regenerated dental pulp tissue. However, there was no pulp tissue regenerated in Traditional Induced Root Apex Formation Group, in which only the irregular calcified tissues were formed at root canal. Conclusion    SPED aggregate can regenerate dental pulp and the regenerated tissue not only has the normal morphological structure, but also has the physiological functions of forming dentin and inducing root apex formation.

Key words: stem cells from human exfoliated deciduous teeth, SHED;cell aggregate;pulp regeneration