草铵膦的大鼠肝脏毒性

目的 了解除草剂草铵膦原药对大鼠肝脏的毒性作用.方法 将80只6周龄SD大鼠(体重140～160 g)随机分成4组,每组20只.草铵膦原药设100、250、500 mg/kg剂量组.每日经口灌胃染毒1次,连续90 d.对照组给予等量2%吐温水溶液.每周用电子称称量大鼠体重.90 d后检测血清中谷丙转氨酶(ALT)、谷草转氨酶(AST)、碱性磷酸酶(ALP)的活力,测定肝脏重量并计算肝脏系数,光学显微镜下对大鼠肝脏进行组织病理学检查.结果 连续染毒8周后与对照组比较,500mg/kg剂量组大鼠肝重(均P＜0.05)染毒90 d后,ALT、AST、ALP酶活力均升高(均P＜0.05);肝脏系数升高(均P＜0.05),肝脏组织有一定的病理改变.结论 500 mg/kg草铵膦原药对大鼠肝脏有一定的毒性作用.

Toxic Effect of Glufosinate-Ammonium on Liver of Rats

Objective To study the toxic effect of glufosinate-ammonium on the liver. Methods SD rats aged 6 weeks with weight of 140-160 g were randomly divided into four groups, 20 (10 males and 10 females) in each group. The rats were treated for three months by gavaging different doses of glufosinate-ammonium (0, 100, 250, 500 mg/kg bw) for the experimental group and 2% Tween-80 solution for the control group. All the rats were weighted once a week. The activity of alanine aminotransferase (ALT), aspartate aminotransferase (AST) and alkaline phosphatase (ALP) in the serum were determined at the end of the study. Liver weight was measured and liver index was calculated. Pathological examination was performed. Results Treated with high-dose of glufosinate-ammonium, a retarded growth of rats was seen, the activity of ALT, AST and ALP increased significantly in both male and female rats, the liver index increased significantly and pathological changes of the liver were also observed compared with the control. No significant changes were found in the rats treated with moderate and low dose compared with the control. Conclusion Glufosinate-ammonium may produce a toxic effect on the liver of rat when the exposed dose is more than 500 mg/kg.