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b[a]p和ddt亚急性联合暴露对小鼠肝功能酶alt、ast和γ-gt的影响及作用形式

Keywords: 苯并[a]芘,滴滴涕,联合暴露,谷丙转氨酶,谷草转氨酶,γ-谷胺酰转移酶,交互作用

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Abstract:

?目的:探讨不同剂量的苯并[a]芘(b[a]p)和滴滴涕(ddt)联合暴露对小鼠血清中谷丙转氨酶(alt)、谷草转氨酶(ast)和γ-谷胺酰转移酶(γ-gt)的影响及作用形式。方法:成年雄性昆明种小鼠50只,随机分为10组即空白对照组(正常饲养)、溶剂对照组(食用油和二甲基亚砜处理)、低和高浓度b[a]p染毒组[1.0和10mg/(kg·d)]、低和高浓度ddt染毒组[0.6和6mg/(kg·d)]、低浓度ddt+低浓度b[a]p染毒组、低浓度ddt+高浓度b[a]p染毒组、高浓度ddt+低浓度b[a]p染毒组、高浓度ddt+高浓度b[a]p染毒组。染毒组各受试物经腹腔注射染毒,每日注射1次,连续31d。末次染毒24h后通过眼球摘除取血,自动生化仪检测血清中alt、ast、γ-gt的活性;并制作肝脏he切片,观察肝细胞形态。采用两因素三水平析因设计的方差分析对数据进行统计分析。结果:与对照组比较,b[a]p和ddt单独染毒时,均能诱导alt和ast活性升高(f=41.308,p=0.000;f=20.083,p=0.000),随各自染毒剂量的增加,alt和ast活性升高,但二者联合暴露对alt和ast活性均不存在交互作用(分别为p=0.258,p=0.264)。b[a]p和ddt单独染毒对γ-gt活性均未产生明显影响,联合暴露也不存在交互作用(p=0.816)。he染色观察到肝细胞膜界限模糊,发生水样变性,肝细胞中出现小空泡,呈蜂窝状,随染毒剂量增加,肝细胞质水样变性加剧,部分肝细胞质溶解,并且细胞核肿大,形状不规则。结论:在本实验条件下,b[a]p和ddt单独染毒均能诱导小鼠血清alt和ast活性升高,不同剂量的b[a]p和ddt联合暴露对小鼠血清alt、ast活性的作用形式主要表现为单独作用,而非交互作用。b[a]p和ddt的单独和联合暴露均未观察到对γ-gt的活性产生明显影响。

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