目的:探讨甲炎康泰对自身免疫性甲状腺炎(AIT)大鼠Th1/Th2细胞平衡偏移作用机制.方法:采用Lewis大鼠建立AIT大鼠40只,6周后随机分为模型组、甲炎康泰低、中、高剂量组,每组10只,每天分别按去离子水、0.708、1.417、2.834 g·kg-1剂量连续灌胃8周.检测血清TgAb、TPOAb;Th1、Th2细胞分布比例及Th1/Th2比率;检测血浆中IL-4、IL-5、IFN-γ、TNF-α和IL-1α含量;HE染色观察甲状腺组织的病理;免疫组织化学检测甲状腺IFN-γ、IL-4蛋白表达.结果:甲炎康泰高剂量组能够下降AIT大鼠TPOAb、TGAb水平,降低甲状腺炎发生率、Th1与Th2细胞分布比例以及Th1/Th2比率;降低血浆IFN-γ、TNF-α、IL-1α、IL-4、IL-5含量;降低甲状腺IFN-γ、IL-4蛋白表达.结论:甲炎康泰具有降低AIT大鼠甲状腺自身抗体的作用,可能与通过调节细胞因子水平和Th1/Th2细胞平衡偏移有关.
This study was aimed to explore the mechanism of Jia-Yan-Kang-Tai (JYKT) on Th1/Th2 immune cell imbalance in rats with autoimmune thyroiditis (AIT).A total of 40 Lewis rats were made into AIT rat model.Six week later,AIT rats were randomly divided into the model group,low-dose,middle-dose and high-dose JYKT group,with 10 rats in each group.Intragastric administration of deionized water,0.708 g· kg-1,1.417 g· kg-1 and 2.834 g· kg-1 JYKT was given to rats in each group,respectively for 8 consecutive weeks.Serum TgAb and TPOAb were detected.The ratio of Th1 cell,Th2 cell and Th1/Th2 was measured.Contents of IL-4,IL-5,IFN-γ,TNF-α and IL-1oα in plasma were detected.The pathology of thyroid tissues was observed by HE dyeing.The protein expressions of IFN-γ and IL-4 in thyroid tissues were observed under immunohistochemical staining.The results showed that high-dose JYKT group can reduce the level of TPOAb and TGAb,the incidence of thyroiditis,the ratio of Th1 cell,Th2 cell and Th1/Th2;decrease contents of IFN-γ,TNF-α,IL-1α,IL-4 and IL-5 in plasma;reduce the protein expression of IFN-γ and IL-4 in thyroid tissues.It was concluded that JYKT was able to suppress thyroid autoantibodies of AIT rats,which may be related to the regulation of cytokine level and Th 1/Th2 immune cell imbalance.