摘要目的 观察不同程度的碘过量对小鼠甲状腺滤泡和胰腺腺泡细胞形态学变化的影响.方法 选取60只雌性(BALB/c)小鼠,体重18～22 g,按体重采用随机数字表法将小鼠分为6组,每组10只.采用在饮用水中加入碘酸钾的形式,按碘含量分成300、600、1 200、2 400和4 800μg/L组,正常(对照)组给予正常碘含量(5 μg/L)的自来水.饲养1个月,取小鼠甲状腺和胰腺组织,光镜下观察甲状腺滤泡和胰腺腺泡细胞形态,电镜下观察胰腺超微结构变化.结果 光镜下,从1 200 μg/L组开始,甲状腺滤泡腔逐渐增大,细胞变为扁平;小鼠胰腺腺泡细胞肿胀,并出现空泡样变形.电镜下,从600μg/L组开始,胰腺腺泡细胞超微结构出现显著变化,酶原数量减少,细胞器变性坏死,以及内质网扩张.结论 碘过量可引起小鼠胰腺腺泡细胞损伤.

abstractsObjective To explore the effect of different levels of iodine excess on morphological changes of mouse thyroid follicle and pancreatic acinar cells.Methods Sixty female mice (BALB/c) were selected and their body weight were 18-22 g.The mice were divided into 6 groups according to body weight via the random number table method,10 mice in each group.Potassium iodate was added to drinking water in exposure groups with iodine contents of 300,600,1 200,2 400,and 4 800 μg/L,while normal group (control) was given normal levels of iodine (5 μg/L) tap water.After feeding for one month,the thyroid and pancreas of the mice were harvested,and the morphology of thyroid follicle and pancreatic acinar cells were observed through light microscope and ultrastructural changes of pancreas were observed through electron microscope.Results After one month of feeding,mice in the high iodine drinking water groups,starting from the 1 200 μg/L group,thyroid follicular cavity gradually enlarged and cells became flat;swollen and vacuolar-like deformation were observed in the mouse pancreas acinar cells under light microscope.Under the electron microscope,the ultrastructure of pancreatic acinar cells changed significantly starting from the 600 μg/L group,the number of zymogens decreased,organelle degeneration and necrosis,and endoplasmic reticulum expanded.Conclusion Iodine excess can cause damage to pancreatic acinar cells in mice.