【摘要】 目的探讨甲状腺蛋白水解酶在过量碘性甲状腺损伤中的作用。方法选取FRTL细胞系为研究对象,正常组培养基内不加碘,高碘组分别含碘(碘化钾)1、5、10、50、100mmol/L,培养6、12、24、48、72h,荧光分光光度法测定蛋白酶B(CB)活性,Lowry法测定蛋白酶D(CD)活性,荧光定量PCR法测定CB和CD的mRNA水平。结果50mmol/L碘作用12h开始出现CB活性的下降,但是需作用24h始出现CD活性的下降。50mmol/L碘作用24h,高碘组CB、CDmRNA水平均较正常组显著下降。结论CB和CD活性的下降是过量碘导致的甲状腺胶质潴留的重要原因之一。更多还原

【Abstract】 Objective: To explore the effect of iodine overdose on cathepsin B and D in thyroidcell line (FRTL). Method: The cells were treated with potassium iodide (0, 1, 5, 10, 50 and 100mmol/L). After treatment 6, 12, 24, 48 and 72 hours, the cells were collected. The activities of cathepsin B (CB) and cathepsin D (CD) were assayed by fluorospectrophotometry and Lowry, respectively. The mRNA levels of CB and CD were determined with real-time PCR. Results: After 12 and 24 hours, the activities of CB and CD, treated by 50mmol/L potassium iodide were decreased significanty. The mRNA levels of CB and CD of 50mmol/L potassium iodide group were decreased significanty after treatment 24 hours. Conclusion: The decreased activities of CB and CD were one of reasons of thyroid colloid retention resulted from iodine excess.更多还原