除草剂2-甲-4氯苯氧乙酸对雄性小鼠的毒作用

The Toxic Effect of 2-Methyl-4-chlorophenoxyacetic Acid in Male Mice

目的观察除草剂2-甲-4-氯苯氧乙酸(MCPA)对雄性小鼠的毒作用。方法将雄性昆明种小鼠随机分为4组,每组10只。对照组给予蒸馏水灌胃,其余3组分别以20、100和200mg/kgMCPA灌胃,每天1次,每周6次,连续17d。测定小鼠的体重、甲状腺素(T4)、三碘甲腺原氨酸(TSH)、胆固醇含量、脾和睾丸的脏器系数、睾丸组织中的乳酸脱氢酶(LDH)和山梨醇脱氢酶(SDH)的比活性。结果与对照组比较,各MCPA染毒组体重增长缓慢。200mg/kg组的脾系数、血清TSH明显低于对照组。血清胆固醇含量随剂量升高而上升。与对照组比较,20mg/kg组T4升高有显著性(P<0.05);200mg/kg组T4降低有显著性(P<0.05);睾丸系数随剂量的增加而明显降低,睾丸组织中的LDH活性各染毒组均明显升高,但SDH未见明显变化。结论除草剂MCPA可抑制雄性小鼠体重增长,并导致内分泌功能紊乱、脾萎缩,具有生殖毒性。

Objective To observe the toxic effects of2-methyl-4-chlorophenoxyacetic acid(MCPA)in male mice.Meth-ods The Kunming male mice were divided into4groups,10male mice per group.The control group were purfused into stom-ach by distilled water,the other three groups were perfused into stomach by20,100and200mg /kg MCPA,once a day,6times per week,continuously for17days.The body weight ,T 4 ,TSH,cholesterol,the ratio of spleen and testis to body weight and the specific activity of LDH,SDH in the testis were analyzed.Results The body weight of mice in MCPA-exposure groups in-creased more slowly than that in the control group.The contents of TSH in serum and ratio of spleen to body weight in200mg/kg group were significantly lower than those in control group.The contents of cholesterol in serum increased with the increases of MCPA-exposure doses.The contents of T 4 in serum were significantly higher in20mg /kg group and lower in200mg /kg group compared with that in control group.The ratio of the testis to body weight reduced with increase of the MCPA-exposure doses,and the specific activity of LDH in the testis of MCPA-exposure groups increased significantly,but the specific activity of SDH in the testis of MCPA-exposure groups revealed no significant variations compared with that of control group.Conclusion MC-PA inhibited the growth of male mice,resulted in endocrine disorder,the atrophy of spleen,and presented the toxicity of repro-ductive system.