应用FRTL-5细胞甄别农药亚乙基硫脲、二甲戊乐灵甲状腺素干扰效应

目的　了解亚乙基硫脲 (ETU)、二甲戊乐灵对FRTL 5细胞分泌甲状腺球蛋白的影响。方法　首先用MTT法测这两种化学物的细胞毒性。然后根据细胞毒性结果确定染毒剂量并用放免法测细胞培养液甲状腺球蛋白的浓度。结果　MTT实验中 ,当二甲戊乐灵浓度大于 5ng μl,亚乙基硫脲浓度大于 36 0ng μl时 ,有明显细胞毒性。亚乙基硫脲和二甲戊乐灵在中高剂量均可引起甲状腺球蛋白浓度显著降低。结论　这两种化学物可能干扰甲状腺球蛋白的合成和分泌。

Using the FRTL-5 cell to screen the thyroxine disrupting effects of the two pesticides-ethylenethiourea and pendimethalin

OBJECTIVE: In order to study the effects of ethylenethiourea(ETU) and pendimethalin on synthesis and secretion of thyroglobulin(Tg) in FRTL-5 cells in vitro. METHODS: MTT test was used to investigate the cytotoxicity of the two chemicals to FRTL-5 cell. When the concentration of pendimethalin exceeded 5 ng/microliter, and the concentration of ethylenethiourea exceeded 360 ng/microliter, there was distinct cytotoxicity to FRTL-5 cell. The radioimmunoassay was also used to detect the level of thyroglobulin in culture. The exposure doses in radioimmunoassay was based on the MTT test. RESULTS: The concentration of Tg was decreased in medium and high dose of pendimethalin and ethylenethiourea. CONCLUSION: It is likely, therefore, that the two pesticides might disrupt FRTL-5 cell of synthesizing and secreting Tg.