糖尿病大鼠牙周组织中TNF-α的检测及组织学改变

目的 研究不同时期糖尿病大鼠实验性牙周炎组织病理学改变及牙周组织中TNF-α的变化，从细胞学角度探讨糖尿病促进牙周炎发生发展的机制。方法 用链脲佐菌素给大鼠行腹腔一次注射，建立糖尿病大鼠模型；上下颌牙用丝线结扎法形成局部刺激因素。观察6周、9周、12周时大鼠牙周组织变化，并用免疫组织化学结合MSP定量分析法，检测牙周组织的TNF-α水平。结果 ①糖尿病大鼠较非糖尿病大鼠的实验性牙周炎发生时间早、病损严重；②糖尿病大鼠较非糖尿病大鼠牙周炎时牙周组织中TNF-α含量增加。结论 ①糖尿病在牙周炎发生发展中起促进作用；②糖尿病时，TNF-α释放增加，使组织损伤-修复的动态平衡失调，致牙周组织炎症加重。

Research on Histologic Changes of Periodontal Tissue,Testification of TNF-α and Their Relationship in Diabetics Rats

OBJECTIVE: The histologic and TNF-alpha changes of the experimental periodontitis were studied in diabetic rat model in different periods. The mechanism of the occurring and developing of periodontitis was probed on the aspect of cytology. METHODS: The diabetic rat models were established by injecting streptozotocin into its abdomen.The local stimulation was caused by tiring silk thread to teeth. The histologic changes of periodontium were observed at 6,9,and 12 weeks. The level of TNF-alpha was testified using immunohistochemistry method at 12 weeks. RESULTS: Periodontitis occurred in diabetic rats earlier than in non-diabetic ones. The destructions were more severe and more widely in diabetic rats than in non-diabetic ones. The level of TNF-alpha was higher in the experimental periodontium of diabetic rats than those non-diabetics. CONCLUSIONS: Diabetes mellitus has an accelerating effect on occurring and developing of periodontitis. When with diabetes, more cytokines were released, and cause the unbalance of ruin and repair and result in the enhancing of periodontitis.