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作 者:刘承芸[1] 白文琳[1] 陈建平[1] 牛侨[1]
出 处:《中华行为医学与脑科学杂志》2015年第2期105-108,共4页Chinese Journal of Behavioral Medicine and Brain Science
基 金:山西省省青年科技研究基金(2011021030-2);山西医科大学青年基金(02200827);山西医科大学博士启动基金(03201008);山西医科大学创新基金(01201108)
摘 要:目的 探讨孕哺期接触多氯联苯对仔鼠学习记忆的影响及生理机制.方法 成年Wistar大鼠受孕后用不同浓度的aroclor1254染毒,仔鼠出生1个月后进行水迷宫实验,分离海马细胞测定细胞内游离钙离子浓度,透射电镜观察海马神经元的超微结构.结果 各组仔鼠经过4d训练后潜伏期与第1天相比均明显缩短(P<0.05),但在同一天中染毒组与对照组的潜伏期差异无统计学意义;空间探索实验中,各剂量组仔鼠第一次穿越平台时间与对照组相比均延长,其中中、高剂量组与对照组差异明显[(11.74±6.56)s、(20.83±8.38)s,(5.23±1.16)s;均P<0.05)],各剂量组在第四象限的停留时间与对照相比均明显减少[分别是(40.14±7.14)s,(33.76±5.58)s,(32.45±6.00)s,(30.63±5.10)s;P<0.05];穿越平台次数随着染毒剂量增加而减少[分别为(4.14±1.21)次,(3.00±1.32)次,(2.65±1.13)次,(2.42±1.31)次;P<0.05)],中高剂量组差异具有统计学意义(P<0.05),中高剂量组与对照组和低剂量组相比在目标象限停留时间明显减少[(40.14±7.14)s,(33.76±5.58)s,(32.45±6.00)s,(30.63±5.10)s);P<0.05].染毒组细胞内游离钙离子浓度明显增高[分别为(121.16±12.23) nM,(141.27±24.66) nM,(163.32±29.75) nM,(261.46±27.79) nM],中高剂量组差异具有统计学意义(P<0.05).高剂量组海马神经元结构被破坏,表现为线粒体肿胀,脊排列紊乱,核膜崩解,脱髓鞘改变.结论 Aroclor 1254孕哺期染毒能引起子代大鼠学习记忆能力降低和超微结构的改变,这种作用可能与细胞内钙离子稳态失衡有关.Objective To explore the effect of polychlorinated biphenyls (PCBs) on the learning and memory of gestational and lactational exposure to polychlorinated biphenyls in rats offspring.Methods The PCB mixture (A1254,0,5,10,20 mg/kg body weight) was administered to pregnant wistar rats every 3 days by gavage from gestational day (GD) 5 to postnatal day (PND) 20.To assess the effects on offspring following such exposure,Morris water maze test was performed to assess the learning and memory ability.Calcium concentration was assayed in hippocampus and the ultramicro structure was observed.Results After training for four days,the escaping latency in every group decreased significantly compared with the first day,especially the control group,the results in the fourth day decreased significantly with the early three days(P〈0.05).The offsprings of the 10 and 20 mg/kg had prolonged time of passing the aim target ((5.23± 1.16) s,(7.90±3.21) s,(11.74±6.56) s and (20.83± 8.38) s ; P〈0.05),decreased number of crossing platform ((4.14± 1.21),(3.00± 1.32),(2.65± 1.13),(2.42± 1.31) ; P〈0.05) and swimming time in the target area ((40.14±7.14)s,(33.76±5.58)s,(32.45±6.00)s and (30.63±5.10) s; P〈0.05)compared with those of the rats of control and 5 mg/kg groups.The calcium concentration increased ((121.16± 12.23) nM,(141.27±24.66) nM,(163.32±29.75) nM,(261.46±27.79) nM) and the ultramicro structure in hippocampus changed obviously in the high exposure group.Conclusion Gestational and lactational exposure to aroclor 1254 in rats could affect the leaming and memory ability of offsprings.
关 键 词:aroclor1254 海马 学习记忆 钙 超微结构
分 类 号:R114[医药卫生—卫生毒理学]
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