与为“增强的OECD测试指南407”建立测试协议的国际验证项目相关,我们进行了初步的28天,氟他胺的重复剂量毒性研究,非甾体雄激素拮抗剂,并评估了用于检测内分泌干扰化学物质(EDCs)的内分泌相关影响的参数列表的敏感性。将7周龄CD(SD)IGS大鼠分为4组,每个由10名男性和10名女性组成,并以0(对照)的剂量通过口服灌胃每天一次给予氟他胺,0.25、1和4mg/kg体重/天。在第28次给药后1天处死雄性大鼠。雌性大鼠在最后一次治疗后进入发情周期的发情周期的那一天被杀死。以1和4mg/kg的剂量水平接受氟他胺的雄性大鼠显示乳腺小叶萎缩和附睾重量降低。此外,4mg/kg氟他胺治疗的男性血清睾酮和雌二醇水平升高,副性腺重量降低。在女性中,在4mg/kg的氟他胺治疗组中也观察到发情周期的轻微延长。血液学无法检测到剂量相关的变化,血清生化和精子分析。因此,在本实验系统测试的参数中,内分泌相关器官的重量及其组织病理学评估,血清激素水平,和发情周期阶段允许检测到氟他胺的内分泌相关作用。
In association with the international validation project to establish a test protocol for the \'Enhanced OECD Test
Guideline 407\', we performed a preliminary 28-day, repeated-dose toxicity study of flutamide, a non-steroidal androgen antagonist, and assessed the sensitivity of a list of parameters for detecting endocrine-related effects of endocrine-disrupting chemicals (EDCs). Seven-week-old CD(SD)IGS rats were divided into four groups, each consisting of 10 males and 10 females, and administered flutamide once daily by oral gavage at doses of 0 (control), 0.25, 1 and 4 mg/kg body weight/day. Male rats were killed 1 day after the 28th administration. Female rats were killed on the day they entered the diestrus stage in the estrous cycle following the last treatment. Male rats receiving flutamide at dose levels of 1 and 4 mg/kg showed lobular atrophy of the mammary gland and a decrease in epididymal weight. In addition, 4 mg/kg flutamide-treated males exhibited raised serum testosterone and estradiol levels and decreased weight of the accessory sex glands. In females, a slight prolongation of the estrous cycle was also observed in the 4 mg/kg flutamide-treated group. No dose-related changes could be detected by haematology, serum biochemistry and sperm analysis. Thus, among the parameters tested in the present experimental system, the weight of endocrine-linked organs and their histopathological assessment, serum hormone levels, and estrous cycle stage allowed the detection of endocrine-related effects of flutamide.