Page 54 - 南京医科大学学报自然科学版

南京医科大学学报（自然科学版） 第41卷第6期
·832 · Journal of Nanjing Medical University（Natural Sciences） 2021年6月

·基础医学·

α7烟碱型乙酰胆碱受体基因敲除小鼠牙髓炎模型的构建

朱晓东 1，2，3 ，许 是 ，蒋 玫 1，2，3 ，沈天晖 1，2，3 ，范 益 ，张光东 1，2，3*
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南京医科大学附属口腔医院综合诊疗科，南京医科大学口腔疾病研究江苏省重点实验室，江苏省口腔转化医学工程中心，江
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苏 南京 210029；南京市口腔医院牙体牙髓科，江苏 南京 210008；南京医科大学药理学系，江苏 南京 210029
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［摘 要］ 目的：构建α7烟碱型乙酰胆碱受体（α7 nicotine acetylcholine receptor，α7 nAChR）基因敲除小鼠牙髓炎模型，为研究
α7 nAChR在牙髓炎发生发展过程中的作用机制提供实验模型。方法：取16只α7 nAChR基因敲除（knock out，KO）小鼠和16只野
生型（wide type，WT）C57BL/6 鼠的上颌第一磨牙的牙髓暴露法建立牙髓炎模型，分别在牙髓暴露后 1、3、7 d 处死小鼠，HE 染
色、免疫组化检测牙髓组织NOD样受体蛋白3（NOD⁃like receptor protein 3，NLRP3）表达情况。结果：HE染色结果显示牙髓暴
露后1 d，α7 nAChR KO鼠及WT鼠的穿髓孔周围血管充血、组织水肿；牙髓暴露后3 d，炎症细胞聚集，α7 nAChR KO鼠炎症细
胞聚集已达冠髓底部，WT鼠的炎症细胞主要聚集在穿髓孔周围的牙髓组织中；牙髓暴露后7 d，α7 nAChR KO鼠的牙髓炎症细
胞浸润至根部牙髓，而 WT鼠的牙髓炎症细胞仍然主要聚集于冠髓底部。免疫组化染色结果显示，牙髓暴露后，α7 nAChR KO
鼠牙髓NLRP3表达高于WT鼠，差异有统计学意义（P < 0.05）。结论：成功建立了α7 nAChR基因敲除鼠的牙髓炎模型，而且α7
nAChR基因敲除鼠牙髓炎症浸润明显快于WT小鼠。
［关键词］ 基因敲除小鼠；牙髓炎；α7烟碱型乙酰胆碱能受体；NLRP3炎症小体
［中图分类号］ R781.31 ［文献标志码］ A ［文章编号］ 1007⁃4368（2021）06⁃832⁃06
doi：10.7655/NYDXBNS20210607

Construction of the dental pulpitis model of α7 nAChR gene knock out mice

1，2，3 4 1，2，3 1，2，3 5 1，2，3*
ZHU Xiaodong ，XU Shi ，JIANG Mei ，SHEN Tianhui ，FAN Yi ，ZHANG Guangdong
1 Department of General Dentistry，the Affiliated Stomatological Hospital of Nanjing Medical University，Jiangsu Key
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Laboratory of Oral Diseases of Nanjing Medical University，Jiangsu Province Engineering Research Center of
Stomatological Translational Medicine，Nanjing 2100029；Department of Conservative Dentistry & Endodontics，
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Nanjing Stomatological Hospital，Nanjing 210008；Department of Pharmacology，Nanjing Medical University，
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Nanjing 210029，China

［Abstract］ Objective：The dental pulpitis model of α7 nAChR gene knockout mice was established to provide an experimental
model for studying the mechanism of α7 nAChR in the occurrence and development of dental pulpitis. Methods：Sixteen α7 nAChR
knockout mice（knock out，KO）and 16 wild type（wild type，WT）in C57BL/6 were selected，and a hole was drilled on the maxillary first
molars to expose dental pulp to constructed dental pulpitis model. The mice were sacrificed on 1 day，3 days，7 days after operation
respectively. HE staining and immunohistochemistry were carried out for detecting NOD⁃like receptor protein 3（NLRP3）. Results：
HE staining showed blood congestion and tissue edema around the medullary foramen in α7 nAChR KO mice and WT mice at 1 day
after medullary cavity exposure. On 3 days after the exposure of the dental pulp cavity，the inflammatory cells were aggregated，reached
to the bottom of the crown pulp in α7 nAChR KO mice，while were mainly around the perforationin the pulp tissue in WT mice. On 7
days，pulpitis cells of α7 nAChR KO mice were infiltrated into root pulp，while inflammatory pulp cells of WT mice were still
concentrated mainly in the crown pulp. The expression of NLRP3 in pulpitis of α7nAChR KO mice was significantly higher than that of
WT mice by immunohistochemical staining（P < 0.05）. Conclusion：The pulpitis model of α7 nAChR gene knockout mice was
successfully constructed，and the pulpitis infiltration of α7 nAChR gene knockout mice was significantly faster than that of WT mice.
［Key words］ knock⁃out mice；pulpitis；α7 nAChR；NLRP3 inflammasome
［J Nanjing Med Univ，2021，41（06）：832⁃837］
［基金项目］ 江苏省自然科学基金（BK20191347）
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通信作者（Corresponding author），E⁃mail：gd⁃zhang@njmu.edu.cn