中国组织工程研究 ›› 2022, Vol. 26 ›› Issue (29): 4605-4610.doi: 10.12307/2022.926

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

2型糖尿病伴牙周炎模型大鼠胰腺自噬及胰岛素相关基因蛋白的表达

都沙沙,蔡智国,杨  琨,刘  琪   

  1. 遵义医科大学附属口腔医院牙周科,贵州省遵义市   563003
  • 收稿日期:2021-05-28 接受日期:2021-08-06 出版日期:2022-10-18 发布日期:2022-03-27
  • 通讯作者: 刘琪,博士,教授,遵义医科大学附属口腔医院牙周科,贵州省遵义市 563003
  • 作者简介:都沙沙,女,1991年生,贵州省遵义市人,汉族,2019年遵义医科大学毕业,硕士,医师,主要从事牙周炎与2型糖尿病的关系研究。
  • 基金资助:
    国家自然科学基金资助项目(81860196),课题名称:2型糖尿病伴牙周炎牙周膜干细胞凋亡转归的线粒体损伤、自噬失调机制研究,项目负责人:刘琪

Pancreatic autophagy and protein expression of insulin-related genes in type 2 diabetic rats with periodontitis

Du Shasha, Cai Zhiguo, Yang Kun, Liu Qi   

  1. Department of Periodontology, Hospital of Stomatology, Zunyi Medical University, Zunyi 563003, Guizhou Province, China
  • Received:2021-05-28 Accepted:2021-08-06 Online:2022-10-18 Published:2022-03-27
  • Contact: Liu Qi, MD, Professor, Department of Periodontology, Hospital of Stomatology, Zunyi Medical University, Zunyi 563003, Guizhou Province, China
  • About author:Du Shasha, Master, Physician, Department of Periodontology, Hospital of Stomatology, Zunyi Medical University, Zunyi 563003, Guizhou Province, China
  • Supported by:
    the National Natural Science Foundation of China, No. 81860196 (to LQ)

摘要:

文题释义:
牙周炎与糖尿病的关系:近年来,糖尿病与牙周炎之间的双向关系得到学者们的广泛认可,目前有关糖尿病对牙周炎影响的机制研究较多,主要集中在高血糖所致的高炎症状态,破骨活动增强和骨修复减弱的骨代谢平衡失调,糖基化终末产物及其受体间的相互作用;然而牙周病对糖尿病影响的研究较少,故此次研究探讨牙周炎对糖尿病胰腺组织自噬的影响。
自噬:适当的自噬可以清除体内受损的细胞器,而过度的自噬可使细胞器被过度降解从而导致细胞功能受损。

背景:糖尿病易引发全身多种器官发生病变,牙周炎是其并发症之一,牙周炎炎症程度越重,越不利于血糖控制。
目的:通过建立动物模型探索牙周炎对2型糖尿病大鼠胰腺组织自噬的影响。
方法:40只雄性6周龄SD大鼠随机分为对照组和实验组,又将实验组分为糖尿病组、牙周炎组和糖尿病伴牙周炎组,每组10只。高脂高糖喂养+腹腔注射链脲佐菌素构建糖尿病模型,丝线结扎法构建牙周炎模型。ELISA法检测血清中炎症因子表达水平;实时荧光定量PCR检测胰腺组织中自噬及胰岛素分泌相关基因的表达;Western Blot法检测胰腺组织中自噬相关蛋白的表达。
结果与结论:①ELISA结果显示,糖尿病组、牙周炎组及糖尿病伴牙周炎组的肿瘤坏死因子α、白细胞介素1β、白细胞介素6表达水平较对照组依次增加(P < 0.05);②实时荧光定量PCR结果显示,与对照组相比,糖尿病组、糖尿病伴牙周炎组的葡萄糖激酶、葡萄糖转运蛋白2 mRNA表达水平均下降,糖尿病伴牙周炎组的表达下降最多(P < 0.05);同时糖尿病组、糖尿病伴牙周炎组的解偶联蛋白2、Beclin1、LC3ⅡmRNA表达均增加,糖尿病伴牙周炎组的表达增加最多(P < 0.05);但牙周炎组与对照组各指标相比差异无显著性意义(P > 0.05);③Western Blot结果显示,相较于对照组,糖尿病组、糖尿病伴牙周炎组的Beclin1、LC3Ⅱ/LC3Ⅰ表达均增加,糖尿病伴牙周炎组表达增加最多(P < 0.05);但牙周炎组与对照组相比差异无显著性意义(P > 0.05);④推测2型糖尿病大鼠患牙周炎后可能诱导其胰岛细胞过度自噬,进而影响胰岛细胞分泌胰岛素的功能,最终加剧糖尿病病情。
缩略语:葡萄糖转运蛋白2:recombinant glucose transporter 2,GLUT-2

https://orcid.org/0000-0002-1313-2374 (都沙沙) 

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: 糖尿病, 牙周炎, 自噬, 胰岛素分泌, 炎性因子

Abstract: BACKGROUND: Diabetes is prone to cause multiple organ diseases in the body. Periodontitis is one of the complications. The more severe the inflammation of periodontitis is, the less favorable it is for glycemic control.  
OBJECTIVE: To investigate the effect of periodontitis on autophagy of pancreatic tissue in a rat model of type 2 diabetes mellitus.
METHODS:  Forty 6-week-old male Sprague-Dawley rats were randomly divided into a control group and an experimental group, and rats in the experimental group were subdivided into three groups (n=10 per group): a diabetes group, a periodontitis group, and a diabetes+periodontitis group. High fat and high sugar feeding+intraperitoneal injection of streptozotocin was used to establish a diabetic model, and silk thread ligation was used to establish a periodontitis model. Enzyme-linked immune sorbent assay was used to detect the expression of inflammatory factors in rat serum. Real-time fluorescent quantitative PCR was used to detect the expression of autophagy and insulin secretion-related genes in rat pancreatic tissue. Western blot was used to detect the protein expression of autophagy-related in rat pancreatic tissue.  
RESULTS AND CONCLUSION: The results of enzyme-linked immunosorbent assay showed that the expression of tumor necrosis factor α, interleukin 1β, and interleukin 6 was increased sequentially in the diabetes group, the periodontitis group, and the diabetes+periodontitis group compared with that in the control group (P < 0.05). The results of real-time fluorescent quantitative PCR showed that, compared with the control group, the mRNA expression of glucokinase and recombinant glucose transporter 2 was decreased in the diabetes group and the diabetes+periodontitis group, especially in the diabetes+periodontitis group (P < 0.05). At the same time, the mRNA expression of uncoupling protein 2, Beclin1, and LC3II was increased in the diabetes group and the diabetes+periodontitis group, and increased most in the diabetes+periodontitis group (P < 0.05). However, there was no significant difference between the periodontitis group and the control group (P > 0.05). The results of western blot showed that, compared with the control group, the expression of Beclin1, LC3II/LC3I was increased in the diabetes group and the diabetes+periodontitis group, and increased most in the diabetes+periodontitis group (P < 0.05). And there was no significant difference between the periodontitis group and the control group (P > 0.05). Therefore, it is speculated that type 2 diabetes mellitus with periodontitis may induce excessive autophagy of pancreatic islet cells, then impact the secretion function of insulin in islet cells, and finally aggravate the development of diabetes mellitus in the rat models.

Key words: diabetes, periodontitis, autophagy, insulin secretion, inflammatory factor

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