邻苯二甲酸二丁酯对小鼠卵巢功能的影响

目的 探讨邻苯二甲酸二丁酯(DBP)对小鼠卵巢功能的影响.方法 将雌性昆明小鼠按体重随机分为高(400mg/kg)、中(40mg/kg)、低(4mg/kg)DBP染毒组和1个溶剂对照组(二甲基亚砜),每组12只.每天腹腔注射1次0.005ml/(g·d)],连续染毒14 d.阴道脱落细胞涂片法观察动情周期变化,分别于终止染毒第1、14天处死,分离卵巢和子宫,计算脏器系数,并观察卵巢病理变化.结果 各染毒组小鼠食欲降低,活动减少,精神萎靡不振,被毛光泽度下降,部分出现腹泻,体重下降;对照组小鼠食欲正常,精神较好,被毛有光泽.不同组别小鼠染毒前、后体重比较,差异均无统计学意义(P＞0.05).中、高剂量组小鼠动情后期、间期和动情周期时间长于对照组,高剂量组小鼠动情后期、间期和动情周期时间长于低剂量组,差异均有统计学意义(P＜0.05).随着染毒剂量的增加,小鼠动情周期时间逐渐延长,呈剂量-反应关系(rs=0.677,P＜0.001),并主要表现为动情后期和动情间期的延长.终止染毒第1、14天,高、中、低剂量组小鼠卵巢脏器系数与对照组相比,差异均无统计学意义(P＞0.05).终止染毒第1天,高、中、低剂量组小鼠子宫脏器系数高于对照组,终止染毒第14天,中、高剂量组小鼠子宫脏器系数高于对照组,差异均有统计学意义(P＜0.05).随染毒剂量的增高,子宫脏器系数有升高的趋势,呈剂量-反应关系(rs=0.564,P=0.010).终止染毒第1天,高剂量组成熟卵泡数低于对照组,中、高剂量组闭锁卵泡数高于对照组,差异均有统计学意义(P＜0.01);终止染毒第14天,高剂量组闭锁卵泡数高于对照组,差异有统计学意义(P《0.05).结论 邻苯二甲酸二丁酯可影响小鼠卵巢的内分泌功能及卵泡的发育、成熟,在体内可能具有类雌激素作用.

Effects of Dibutyl Phthalate on the Ovary of Mice

Objective To determine the effects of dibutyl phthalate(DBP) on female mice reproductive system. Methods The healthy Kunming adult female mice with body weight from 22 g to 30 g were randomly divided into 4 groups,one as reagent control group. The other three as treated groups, 12 female mice per group. In the exposure groups,the mice were administrated by peritoneal injection with DBP at the dose of 400?40?4mg/kg body weight,respectively. The mice in control group were administrated with the same amount of vehicle(dimethyl sulfoxide). All the mice were administrated once a day,continuously for 14 days. The estrous cycles were observed during the period of the experimental study. On the fifteenth and twenty-eightieth days,the mice were sacrificed. The organ coefficients of uterus and ovary were determined,and the histopathological changes of the left ovary were observed. Results The estrous cycles in 400 mg/kg body weight dose group and 40 mg/kg body weight dose group were markedly delayed with a significant dose-effect relationship. The organ coefficients of the uterus in the groups exposed to DBP were significantly higher than that of the control group. On the fifteenth days,the number of mature follicles in 400 mg/kg body weight dose group was less than that of the control group,but the number of atretic follicles in 400 mg/kg body weight dose group and 40 mg/kg body weight dose group were more than that of the control group. On the twenty-eightieth days,the number of atretic follicles in 400 mg/kg body weight dose group was more than that of the control group. Conclusion Dibutyl phthalate had adverse effects on the reproduction-endocrine system of adult female mice. DBP might demonstrate an estrogenic activity in vivo.