Structure-effect relationships of amiodarone analogues on the inhibition of thyroxine deiodination
作者:H. R. Ha、B. Stieger、G. Grassi、H. R. Altorfer、F. Follath
DOI:10.1007/s002280050701
日期:2000.3.24
Amiodarone (AMI) has proven to be a potent anti-arrhythmic compound. Due to the structural similarity between AMI and thyroid hormone, it is possible that the drug could inhibit the activity of the 5'-thyroxine-deiodinase. METHODS AMI analogues resulting from (1) dealkylation, (2) deiodination and (3) deamination were synthesised and used as inhibitors in an in vitro biotransformation reaction of thyroxine
目的胺碘酮(AMI)已被证明是一种有效的抗心律不齐化合物。由于AMI和甲状腺激素之间的结构相似性,该药物可能会抑制5'-甲状腺素-脱碘酶的活性。方法合成由(1)脱烷基,(2)脱碘和(3)脱氨基产生的AMI类似物,并将其用作甲状腺素(T4)到3,3',5'-三碘甲腺氨酸(T3)的体外生物转化反应的抑制剂。使用高效液相色谱法和紫外检测法定量T3,发现I型5'-T4脱碘酶参与了该反应。在单独的场合,将AMI或AMI类似物作为抑制剂加入反应中。结果所有研究的AMI类似物均竞争性抑制5'-T4脱碘作用(Ki值范围为25-360 microM)。在1-1000 microM的浓度范围内,AMI及其N-去乙基,去碘化的类似物非常弱地抑制5'-T4的去碘化。在4-位带有羟基的AMI类似物是强抑制剂。而且,二碘代-AMI类似物比其相应的单碘或去碘代衍生物更强烈地抑制5'-T4去碘化。结论AMI的降解产物