【摘要】 目的:探讨poly(I∶C)作为病毒类似物对碘过量所致NOD鼠慢性淋巴细胞性甲状腺炎的影响。方法:将32只雌性NOD鼠,随机分为4组,每组8只,分别为:(1)对照组;(2)碘过量组;(3)poly(I∶C)组;(4)碘过量联合poly(I∶C)组。作用9周后处死动物:观测体重、甲状腺重量及其解剖形态;采用放射免疫分析法检测血清中甲状腺激素(T4)水平;HE染色观察甲状腺组织形态变化,TUNEL技术检测甲状腺组织细胞凋亡情况,定量PCR法检测凋亡相关基因(TRAIL、TRAIL-sR1)和炎症相关基因(ICAM-1、CXCL10)mRNA表达。结果:碘过量组较对照组、Poly(I∶C)组甲状腺绝对重量及相对重量均明显增加(P<0.01);血清总T4水平下降(P<0.05);炎症破坏和细胞凋亡明显加强;上调TRAIL、TRAIL-sR1、ICAM-1、CXCL10mRNA表达(P<0.05)。碘过量联合poly(I∶C)组较单纯碘过量组甲状腺绝对重量及相对重量均进一步增加;血清总T4水平显著下降(P<0.05);炎症进一步加重,破坏程度IV级所占比例升至50.0%;凋亡细胞数量明显增加,进一步上调TRAIL、TRAIL-sR1、ICAM-1、CXCL10mRNA表达(P<0.05)。Poly(I∶C)组各值与对照组趋势一致(P>0.05)。结论:Poly(I∶C)加重碘过量所致慢性淋巴细胞性甲状腺炎发病程度,其作用途径与增加淋巴细胞浸润和甲状腺细胞凋亡有关。更多还原

【Abstract】 AIM:To investigate the effects of poly (I:C) as virus mimics on iodine excess-induced chronic lymphocytic thyroiditis in NOD mouse. METHODS:Female,32 NOD mice were randomly divided into 4 groups:(1) control; (2) high iodine; (3) poly (I:C); (4) high iodine+poly (I:C). Nine weeks after administration,mice were sacrificed. The following parameters were determined:body weight,thyroid weight and anatomic form. Thyroid hormone (T4) in serum was measured by radioimmunoassay,the thyroid morphology was observed through HE staining,apoptosis was detected by TUNEL,the mRNA expression levels of TRAIL,TRAIL-sR1,ICAM-1 and CXCL10 were determined by the method of real time RT-PCR. RESULTS:Compared to control group and poly (I:C) group,the thyroid absolute weight and relative weight in high iodine group were increased (P<0.01),the level of total T4 in serum was decreased (P<0.05),inflammation and apoptosis were obviously observed,the mRNA expressions of TRAIL,TRAIL-sR1,CXCL10 and ICAM-1 were upregulated (P<0.05). Compared to high iodine group,thyroid absolute weight and relative weight in high iodine+poly (I:C) group were further increased,the level of total T4 in serum was further decreased (P<0.05),the ratio of inflammatory degree Ⅳ increased to 50.0%,the numbers of apoptosis cells were further enhanced,the mRNA expressions of TRAIL,TRAIL-sR1,ICAM-1 and CXCL10 were further upregulated (P<0.05). Otherwise,the tendency of all parameters in poly (I:C) group was similar to that in control group (P>0.05). CONCLUSION:Poly (I:C) aggravates chronic lymphocytic thyroiditis induced by excess of iodine associated with increase in infiltration of lymphocytes and induction of apoptosis.更多还原