p,p'-DDE对青春前期大鼠睾丸组织氧化应激及凋亡的影响

目的 研究p,p'-DDE对青春前期大鼠睾丸组织氧化应激及凋亡的影响.方法 将健康清洁级22日龄雄性SD大鼠25只按体重随机分为5组,分别为对照组(玉米油)、低(20 ms/kg)、中(60 mg/kg)、高(100 mg/kg)剂量P,p'-DDE染毒组和VitE干预组(100mg/kg p,p'-DDE+100mg/kg Vit E),每组5只.采用腹腔注射方式进行染毒,注射容积为10ml/kg,每隔1 d染毒1次,共10 d.染毒结束后,处死动物,取睾丸称重,并计算睾丸脏器系数;将睾丸制备组织切片和组织匀浆,分光光度计法测定大鼠睾丸组织超氧化物歧化酶(SOD)活力、丙二醛(MDA)含量和谷胱甘肽过氧化物酶(GSH-Px)活力,采用TUNEL法检测睾丸组织的细胞凋亡情况.结果 各组动物染毒前体重及染毒期间体重变化无差异.大鼠睾丸重量及其脏器系数间比较,差异无统计学意义(P＞0.05).与对照组比较,高、中、低剂量p,p'-DDE染毒组SOD活力降低,中、高剂量p,p'-DDE染毒组MDA含量升高,高剂量p,p'-DDE染毒组GSH-Px活力下降,差异均有统计学意义(P＜0.05).与高剂量p,p'-DDE染毒组比较,Vit E干预组SOD活力升高,差异有统计学意义(P＜0.05).Vit E干预组和高剂量p,p'-DDE染毒组MDA含量和GSH-Px活力间比较,差异无统计学意义(P＞0.05).高、中、低剂量p,p'-DDE染毒组和对照组均有睾丸细胞凋亡情况发生,对照组中凋亡细胞稀少;随着p,p'-DDE染毒剂量的升高,凋亡细胞数也逐渐增多,以精原细胞和精母细胞为主,伴有支持细胞.与对照组比较,高、中、低剂量P,p'-DDE染毒组的细胞凋亡指数均升高,差异有统计学意义(P＜0.05);Vit E干预组的细胞凋亡指数低于高剂量p,p'-DDE染毒组,差异有统计学意义(P＜0.05).结论 p,p'-DDE可通过引发睾丸组织氧化应激而诱导细胞凋亡.

Effects of P,p'-DDE on Oxidative Stress and Apoptosis in Testis of Prepubertal Male Rats

Objective To study the effects of p,p'-DDE on oxidative stress and apoptosis in testis of prepubertal male rats.Methods Twenty-five male SD rats were randomly divided into 5 groups,one control group (corn oil),three p,p'-DDE groups (20,60,100 mg/kg) and one interference group(100 mg/kg Vit E + 100 mg/kg p,p'-DDE) respectively by intraperitoneal injection for 10 days,and the volume of injection was 10 ml/kg.After 10 days of treatment,the rats were sacrificed and the testes were weighted,then homogenates and ...