中国组织工程研究 ›› 2023, Vol. 27 ›› Issue (32): 5196-5202.doi: 10.12307/2023.820

• 口腔组织构建 oral tissue construction • 上一篇    下一篇

2型糖尿病小鼠牙齿牙合向伸长运动过程中根尖周组织的变化

郑  毅1,魏舟丹2,郭  栋3,师子清3,牛蔚然4,许倬瑜5,李鹏翠6,李文晋3   

  1. 1天津医科大学口腔医院,天津市  300070;2上海市普陀区人民医院口腔科,上海市  200333;山西医科大学第二医院,3口腔科,6骨科,山西省太原市  030001;4山西医科大学,山西省太原市  030001;5上海杉达学院,上海市  201209
  • 收稿日期:2022-06-28 接受日期:2022-10-27 出版日期:2023-11-18 发布日期:2023-03-23
  • 通讯作者: 李文晋,博士,副主任医师,山西医科大学第二医院口腔科,山西省太原市 030001
  • 作者简介:郑毅,男,1977年生,汉族,天津医科大学毕业,硕士,主治医师。
  • 基金资助:
    山西省卫生健康委科研课题(2019042),项目负责人:李文晋;山西省留学人员科技活动择优资助项目(20200010),项目负责人:李文晋

Changes in periapical tissue of type 2 diabetic mice during tooth occlusal elongation

Zheng Yi1, Wei Zhoudan2, Guo Dong3, Shi Ziqing3, Niu Weiran4, Xu Zhuoyu5, Li Pengcui6, Li Wenjin3   

  1. 1Stomatology Hospital of Tianjin Medical University, Tianjin 300070, China; 2Department of Stomatology, Putuo District People's Hospital of Shanghai, Shanghai 200333, China; 3Department of Stomatology, 6Department of Orthopedics, The Second Hospital of Shanxi Medical University, Taiyuan 030001, Shanxi Province, China; 4Shanxi Medical University, Taiyuan 030001, Shanxi Province, China; 5Shanda University, Shanghai 201209, China
  • Received:2022-06-28 Accepted:2022-10-27 Online:2023-11-18 Published:2023-03-23
  • Contact: Li Wenjin, MD, Associate chief physician, Department of Stomatology, The Second Hospital of Shanxi Medical University, Taiyuan 030001, Shanxi Province, China
  • About author:Zheng Yi, Master, Attending physician, Stomatology Hospital of Tianjin Medical University, Tianjin 300070, China
  • Supported by:
    the Scientific Research Project of Health Commission of Shanxi Province, No. 2019042 (to LWJ); Excellent Project of Science and Technology Activities for Overseas Chinese in Shanxi Province, No. 20200010 (to LWJ)

摘要:


文题释义:
晚期糖基化终产物受体:糖尿病患者体内的晚期糖基化终产物的形成速度明显加快。晚期糖基化终产物受体可与其结合从而介导如影响机体炎症反应、影响机体免疫防御等重要的生物学效应,在糖尿病、年迈衰弱、恶性肿瘤、牙周炎及血管性疾病等多种病症的发生发展过程中发挥重要作用。
骨唾液蛋白:是骨基质中一种非胶原型磷酸化的糖蛋白,主要表达于未成熟的成骨细胞中,通过刺激成骨细胞的分化进一步加强其对骨的矿化;也可以直接促进成骨细胞的成熟分化及发挥相应功能,同时抑制人骨髓源细胞增殖而加强成骨细胞的分化及矿化,对于骨的形成和矿化起着不可忽视的作用。

背景:临床工作中经常会遇到一些糖尿病患者的牙齿缺失情况,牙齿缺失后如果未及时行修复治疗,会导致对颌牙伸长,引起垂直向牙合间隙减少、咬合早接触、牙合干扰,甚至需要拔除等一系列问题。
目的:观察糖尿病小鼠牙齿牙合向伸长过程中根尖周组织内晚期糖基化终产物受体和骨唾液蛋白的表达,探究糖尿病在牙齿牙合向伸长运动过程中对根尖周组织的影响。
方法:将120只雄性C57BL小鼠随机分为3组,即糖尿病组、阴性对照组和空白对照组(n=40)。糖尿病组腹腔注射70 mg/kg的链脲佐菌素建立糖尿病模型,阴性对照组腹腔注射等量的柠檬酸钠溶液,空白对照组则不做处理。建模成功后,3组中均随机选出30只小鼠拔除右侧上颌磨牙,再将3组小鼠分为0,3,6,9,12 d 5个亚组(n=6),按组别定时处死,提取右侧下颌骨。通过实时荧光定量PCR及免疫组化染色观察小鼠磨牙根尖周组织中晚期糖基化终产物受体和骨唾液蛋白的mRNA和蛋白表达水平。
结果与结论:①实时荧光定量PCR结果:晚期糖基化终产物受体mRNA相对表达量糖尿病组高于其他两组,骨唾液蛋白mRNA的相对表达量糖尿病组少于其他两组(P < 0.05),阴性对照组与空白对照组相比无明显差异(P > 0.05);随着拔牙时间延长,3组中2种基因的相对表达量均呈持续增长的趋势,糖尿病组在3-6 d时表达量增加最快,阴性对照组及空白对照组在6-9 d时增长速度较快;糖尿病组晚期糖基化终产物受体mRNA相对表达量的增长趋势整体较其他两组明显,骨唾液蛋白mRNA相对表达量的增长趋势整体较其他两组平缓;②免疫组化染色结果:3组小鼠磨牙根尖周晚期糖基化终产物受体和骨唾液蛋白的阳性率随拔牙时间延长均越来越高;糖尿病组晚期糖基化终产物受体阳性率在拔牙后各时间点均显著高于其他两组(P < 0.05);骨唾液蛋白阳性率在拔牙后的6,9,12 d显著低于其他两组(P < 0.05);阴性对照组与空白对照组骨唾液蛋白和晚期糖基化终产物受体的阳性率相比无明显差异(P > 0.05);③提示糖尿病小鼠牙齿牙合向伸长过程中根尖周组织内晚期糖基化终产物受体和骨唾液蛋白随着拔牙时间的延长表达量均逐渐增加,骨唾液蛋白的增长速度及表达量均低于阴性对照组及空白对照组,提示糖尿病可能抑制骨唾液蛋白的表达;但晚期糖基化终产物受体高水平可能与糖尿病加速根尖周组织破坏、延缓组织重建速度有关。
https://orcid.org/0000-0003-3016-3460(郑毅)

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

关键词: 骨唾液蛋白, 糖尿病小鼠, 晚期糖基化终产物受体, 牙齿伸长, 免疫组化染色, 实时荧光定量PCR

Abstract: BACKGROUND: In clinical work, some diabetic patients often have tooth loss. If the tooth loss is not timely repaired, it will lead to the elongation of the maxillary teeth, resulting in the reduction of the vertical occlusal gap, early occlusal contact, occlusal interference, and even tooth extraction.
OBJECTIVE: To observe the expression of receptor for advanced glycation end products (RAGE) and bone sialoprotein (BSP) in periapical tissue of diabetic mice during tooth occlusal elongation, and explore the effect of diabetes on periapical tissues.
METHODS: Totally 120 male C57BL mice were divided randomly into diabetic group (n=40), negative control group (n=40) and blank control group (n=40). Animal models of type II diabetes were established in the diabetic group by intraperitoneal injection of 70 mg/kg streptozotocin. The negative control group was intraperitoneally injected with the same amount of sodium citrate solution, while the blank control group was not disposed. After modeling, 30 mice randomly were selected from each group to extract the right maxillary molars. Then, the mice were further divided into five subgroups of 0, 3, 6, 9 and 12 days (n=6 per group). The mice were killed respectively according to the time specified by each group to obtain their right mandibles. The mRNA and protein expression levels of RAGE and BSP in periapical tissue were detected by real-time PCR and immunohistochemistry, respectively.
RESULTS AND CONCLUSION: Real-time PCR results indicated significantly higher RAGE and lower BSP relative mRNA expression levels in the diabetic group than the blank and negative control groups (P < 0.05), while there was no significant difference between blank and negative control groups (P > 0.05). With the time extension of tooth extraction, the relative expression levels of two genes in the three groups both showed a trend of continuous growth. In the diabetic group, the expression levels increased obviously from 3 to 6 days, while in the blank and negative control groups, the expression levels raised apparently from 6 to 9 days. The increase trend of RAGE mRNA relative expression in the diabetic group was more obvious than that in the blank and negative control groups, while the increase trend of BSP mRNA relative expression did the opposite. Immunohistochemical staining results showed that the positive rates of RAGE and BSP in the periapical tissue of the three groups increased with the time prolongation of tooth extraction. The positive rate of RAGE was significantly higher in the diabetic group than the blank and negative control groups at each time after tooth extraction (P < 0.05). The positive rate of BSP was significantly lower in the diabetic group than the blank and negative control groups at 6, 9 and 12 days after tooth extraction (P < 0.05). There was no significant difference in the positive rate of RAGE and BSP between the blank and negative control groups (P > 0.05). To conclude, the expressions of RAGE and BSP in the periapical tissues of diabetic mice increased gradually with the time extension of tooth extraction, while he growth rate and expression of BSP were lower in the diabetic group than the negative and blank control groups. These indicate that diabetes may inhibit the expression of BSP. However, the high expression level of RAGE may be related to the accelerated damage to periapical tissue and delayed tissue reconstruction in diabetes.

Key words: bone sialoprotein, diabetic mouse, receptor for advanced glycation end products, tooth elongation, immunohistochemical staining, real-time fluorescence quantitative PCR

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