孕期二月桂酸二丁基锡暴露对大鼠妊娠结局及胎鼠性发育的影响

目的 研究二月桂酸二丁基锡(DBTD)暴露对Wistar大鼠妊娠结果的影响并评估其对胎鼠性发育的影响.方法 在妊娠第12～19天分别用玉米油和不同浓度的DBTD(10、20、30 mg/kg)灌胃染毒孕鼠,至妊娠第20天,检测母鼠妊娠结局.结果 妊娠20 d时,孕鼠体重随DBTD剂量升高呈下降趋势,但与对照组比较,差异无统计学意义,30 mg/kg组孕鼠子宫重量显著降低;所有DBTD染毒组雄性、雌性胎鼠体重均显著降低,20、30 mg/kg组胎鼠体长显著降低;所有DBTD染毒组雌性胎鼠肛门距生殖器的标化距离显著增长,而雄性胎鼠无显著变化.各DBTD暴露组均未导致胎鼠发生外部畸形,但导致胎鼠趾骨骨化延迟,且在20、30 mg/kg组出现死胎和吸收胎.结论 DBTD暴露影响胎鼠的发育,并可能对雌性胎鼠具有雌性雄性化影响.

Effects of in Utero Di-butyltin Dilaurate Exposure in Rat on Pregnancy Outcome

Objective To study the effects of di-butyltin dilaurate (DBTD) exposure on pregnancy outcome in Wistar rat and evaluate it's effect on sexual development of fetuses. Methods Timed pregnancy rats were treated with corn oil or DBTD (10, 20, 30 mg/kg body weight) from days 12-19 of gestation. On gestational day (GD) 20, dams were sacrificed to investigate the pregnancy outcome. Results There was a downtrend in weight of dams on GD20 as the DBTD exposure dose increased. The weight of dam's utero significantly decreased in 30 mg/kg group. A significant decrease in fetal weights was observed in all DBTD groups, and fetal sizes in 20, 30 mg/kg groups. Exposure to DBTD from GD 12-19 resulted in a distinct increase in normalized anogenital distances in female fetuses, but no effects were seen in male ones. DBTD exposure did not result in external malformations, however, delayed ossification of fetal phalanges was observed in all DBTD treated groups. Dead fetuses and absorbed embryos were observed in 20, 30 mg/kg DBTD groups. Conclusion The results of the present paper show that DBTD exposure has some adverse effects on fetal development and may exert a masculinizing effect on female fetuses.