围生期双酚A暴露对F1雄性子代大鼠脑发育的影响

Effects of Perinatal Bisphenol A Exposure on the Development of Brain of the F1 Generation Male SD Rats

目的研究围生期双酚A暴露对F1雄性子代大鼠出生后不同时期脑发育病理形态学的影响。方法对SD大鼠的母鼠从妊娠第11天直至产后断乳期染毒双酚A犤2,20,100mg/(kg·d)犦,同时设立对照组。每个剂量组分别在出生后第1、5、10、15、21、30、45天各时相点各取6只F1雄性子代大鼠,迅速断头处死大鼠后,取脑组织固定包埋,进行组织病理学检测。结果组织病理学(HE染色)结果显示,出生后1～10d,3个双酚A染毒剂量组的F1雄性子代大鼠在脑组织形态学上未见异常改变。出生后15～30d各剂量组脑组织均有不同程度的异常改变,主要表现为海马CA3区锥体细胞和大脑皮质神经元发生核固缩变性,其中20和100g/(kg·d)组较为严重。在出生后45d海马CA3区和大脑皮质异常细胞减少,组织形态基本正常,但神经细胞总数减少。结论围生期暴露于双酚A可以影响F1雄性子代大鼠的脑发育,可以引起F1雄性子代大鼠在出生后脑的组织病理形态学改变,从而可能最终引起功能和后期行为的改变。

Objective To investigate the effect of perinatal bisphenol A BPA exposure on brain development of F1 male offspring. Methods Pregnant SD rats were given BPA at 2 20 and 100 mg/kg body weight per day respectively from eleventh day of gestation to the whole lactation by gavage until their pups were weaned on postnatal day 21  the control group had no BPA exposure. Every six F1 male pups from each of the four groups were killed at differential time points on postnatal day 1510152130 and 45 respectively. Histopathological examination by HE stain was done on the brains. Results The results showed no abnormal change was found on postnatal day 1-10. Three dosage groups showed abnormal change of different degree on 15th 21th 30th postnatal day the mainly abnormal change was karyopyknosis of pyramidal cell in CA3 of hippocampus and cortical neuron in cerebral cortex. The cell numbers of pyramidal cell in CA3 of hippocampus and cerebral cortex were decreased on 45th postnatal day. Conclusion Perinatal BPA exposure may have an adverse effect on the brain developmnent of F1 male offspring.