不同碘水平对哺乳期大鼠碘代谢及甲状腺功能的影响

目的通过实验了解碘摄入水平对哺乳期大鼠碘营养及甲状腺功能的影响以及是否存在保护子代免受碘缺乏及碘过量危害的机制。方法选择体重80～100 g的雌性Wistar大鼠96只,按体重分层后,再随机分为6组。饲养3个月后先测定尿碘,然后将前5组雌鼠与雄鼠合笼交配,在其产后5、10 d时,每组每批分别处死8只大鼠及其子鼠,取大鼠的血清和子鼠胃里的乳汁。第6组除不与雄鼠交配外,其他处理同前5组。测定大鼠尿碘、血清碘、血清甲状腺激素T3、T4水平及子鼠胃里乳汁碘水平。结果 （1）低碘组大鼠的尿碘、血清碘水平低于对照组,而高碘组、未孕对照组大鼠的尿碘、血清碘水平高于对照组,差异均有统计学意义（P〈0.05）;（2）低碘组乳汁碘水平明显低于对照组,而高碘组明显高于对照组;另外,低碘1组乳汁碘水平明显高于低碘2组,差异有统计学意义（P〈0.01）;（3）低碘组大鼠T3、T4水平均低于对照组,且T3/T4水平明显高于对照组;高碘组大鼠T3、T3/T4水平低于对照组,T4水平高于对照组,差异均有统计学意义（P〈0.01）;（4）各组产后5 d和10 d的数据比较差异无统计学意义。结论不同碘摄入水平导致哺乳期大鼠体内碘营养水平及甲状腺功能发生了改变,且大鼠能够通过哺乳调节对子代的碘供应,以尽量减轻低碘或高碘对子代带来的危害。

Effects of different iodine levels on the iodine metabolism and thyroid function of lactating rats

Objective To understand the effect of iodine intake level on iodine nutrition and thyroid function of lactating rats and the protective mechanism that can protect the offsprings from iodine deficiency or iodine excess by observing the changes of urinary iodine,serum iodine,milk iodine and the level of thyroid hormone of lactating rats,who were in different iodine intake levels.Methods 96 Wistar female rats,who weighed about 80 to 100 grams,were randomly divided into six groups according to their body weight...