实验性根尖周炎模型大鼠核因子?B的表达

BACKGROUND:mRNA expression level of nuclear factor-kappa B (NF-?B) in periapical periodontitis has been shown to be significantly higher than that in normal periapical tissue. OBJECTIVE:To observe the expression of NF-?B in rats with periapical periodontitis.METHODS:Twenty male Sprague-Dawley rats aged 6 weeks were enrolled to establish apical periodontitis model at the right mandibular first motar (experimental group), and the left mandibular first motar as normal control group. Five rats were randomly selected at postoperative 1, 2, 3, and 4 weeks to make frozen sections of the mandibular tissue. The morphology of the periapical tissue was observed through hematoxylin-eosin staining, and the expression level and distribution of NF-?B were detected by immunohistochemical staining. RESULTS AND CONCLUSION: (1) Hematoxylin-eosin staining showed that the apical periodontal tissue of the mandibular first molar at the right side had local inflammatory response and spread to peripheral tissues; while there was no pathological changes in the control group. (2) Immunohistochemistry results revealed that NF-?B expression increased from the 1st week to 2nd week after surgery, and then went down at the 3rd week and reached the lowest point at the 4th week; moreover, the expression level at each time exhibited significant differences (P < 0.05). The amount of NF-?B-positive cells in the experimental group was significantly higher than that in the control group (P < 0.05). (3) These findings suggest that the expression level of NF-?B holds close correlation with the process of periapical periodontitis indicating that NF-?B may participate in the inflammatory reaction of periapical periodontitis. 中国组织工程研究杂志出版内容重点：肾移植；肝移植；移植；心脏移植；组织移植；皮肤移植；皮瓣移植；血管移植；器官移植；组织工程

Expression of nuclear factor-kappa B in rat models of periapical periodontitis