性别分化关键期三丁基氯化锡暴露对大鼠生精功能和睾丸酶活力的影响

目的 探讨性别分化关键期三丁基氯化锡(TBTC)暴露对大鼠性成熟后睾丸酶活力和生精功能的影响.方法 将16只健康成年SPF级妊娠Wistar大鼠随机分为高(5.0 mg/kg)、中(2.5mg/kg)、低剂量(1.0 mg/kg)TBTC染毒组和溶剂对照组(玉米油),每组4只.从妊娠第12天起,采用经口灌胃方式进行染毒,每天1次,直至妊娠第20天,灌胃剂量为5.0ml/kg.出生后第70天,每组随机抽取10只雄性仔鼠,称重后处死,分离双侧睾丸及附睾组织,测定附睾精子数及睾丸酶[乳酸脱氢酶(LDH)、琥珀酸脱氢酶(SDH)、酸性磷酸酶(ACP)、一氧化氮合酶(NOS)]活力.结果 与溶剂对照组比较,各TBTC染毒组孕鼠妊娠第12天及第20天的体重和体重增长量差异无统计学意义(P>0.05).与溶剂对照组比较,高、中剂量TBTC染毒组雄性仔鼠断乳后体重增长较慢,差异均有统计学意义(P<0.01). TBTC染毒组附睾尾精子数随TBTC染毒剂量的升高呈上升趋势,差异有统计学意义(P<0.01).与溶剂对照组相比,高、中、低剂量TBTC染毒组雄性仔鼠LDH活力较高,高、中剂量TBTC染毒组雄性仔鼠SDH活力较高,差异均有统计学意义(P<0.01).各TBTC染毒组雄性仔鼠ACP和NOS活力间比较,差异均无统计学意义(P＞0.05).未发现睾丸组织结构发生改变.结论 性别分化关键期TBTC染毒对雄性仔鼠具有内分泌干扰作用,减缓了雄性仔鼠的体重增长,促进了其精子发生和LDH、SDH的活力.

Abstract：

Objective To explore the effects of exposure to tributyltin chloride (TBTC)during the critical period for sex differentiation on activities of enzymes in testis and spermatogenesis function in Wistar rats.Methods Sixteen healthy adult pregnant Wistar rats were randomly divided into four groups(5,2.5 and 1 mg/kg TBTC,vehicle control)with 4 animals per dose group.They were given doses of TBTC by gavage from days 12-20 of gestation once a day.The volume of the vehicle used was 5 ml/kg body weight.On the postnatal day (PND)70,ten male offsping rats were randomly selected in each group and sacrificed by decapitation after weighed.The sperms in epididymis were counted and the activities of enzymes of testis[including lactate dehydrogenase (LDH),succinate dehydrogenase (SDH),acid phosphatase (ACP),nitric oxide synthase (NOS)]were detected.Several testises were chosen for the histopathological examination.Results The body weight gains of pregnant rats from days 12-20 showed no significant difference among the solvent control group and the each TBTC exposure group (P>0.05).Compared with the control group,body weights gains from PND21-70 were decreased significantly in the 5 and 2.5 mg/kg group (P＜0.01).Cauda epididymal sperm counts increased with the increase of TBTC doses (P<0.01).The activities of LDH in all treated groups and the activities of SDH in the 5 and 2.5 mg/kg TBTC group exhibited significant increase compared with the control group (P＜0.01).There were no significant difference in the activities of ACP and NOS between the exposure groups and the control group(P>0.05).No abnormal structure of testis was observed in all exposure groups.Conclusion Exposure to TBTC during critical period for sex differentiation may decrease body gain and increase spermatogenesis and the activities of LDH and SDH.

Effects of Exposure to Tributyltin Chloride during the Critical Period for Sex Differentiation on Spermatogenesis Function and Activities of Enzyme in Testis in Rats

Objective To explore the effects of exposure to tributyltin chloride (TBTC)during the critical period for sex differentiation on activities of enzymes in testis and spermatogenesis function in Wistar rats.Methods Sixteen healthy adult pregnant Wistar rats were randomly divided into four groups(5,2.5 and 1 mg/kg TBTC,vehicle control)with 4 animals per dose group.They were given doses of TBTC by gavage from days 12-20 of gestation once a day.The volume of the vehicle used was 5 ml/kg body weight.On the postnatal day (PND)70,ten male offsping rats were randomly selected in each group and sacrificed by decapitation after weighed.The sperms in epididymis were counted and the activities of enzymes of testis[including lactate dehydrogenase (LDH),succinate dehydrogenase (SDH),acid phosphatase (ACP),nitric oxide synthase (NOS)]were detected.Several testises were chosen for the histopathological examination.Results The body weight gains of pregnant rats from days 12-20 showed no significant difference among the solvent control group and the each TBTC exposure group (P>0.05).Compared with the control group,body weights gains from PND21-70 were decreased significantly in the 5 and 2.5 mg/kg group (P＜0.01).Cauda epididymal sperm counts increased with the increase of TBTC doses (P<0.01).The activities of LDH in all treated groups and the activities of SDH in the 5 and 2.5 mg/kg TBTC group exhibited significant increase compared with the control group (P＜0.01).There were no significant difference in the activities of ACP and NOS between the exposure groups and the control group(P>0.05).No abnormal structure of testis was observed in all exposure groups.Conclusion Exposure to TBTC during critical period for sex differentiation may decrease body gain and increase spermatogenesis and the activities of LDH and SDH.