氯化甲基汞染毒对亲仔两代ICR小鼠脑、肝、肾中汞分布的影响

目的]通过ICR孕鼠饮水接触低剂量氯化甲基汞,研究汞在亲仔两代小鼠脑、肝、肾及血清中的分布及其相关性。方法]ICR孕鼠随机分为对照组、低剂量组(0.01mg/L)和高剂量组(0.10mg/L),于怀孕第6天起分别自由饮用蒸馏水及氯化甲基汞含量分别为0.01、0.10mg/L的蒸馏水直至哺乳期结束,用原子荧光法测定汞在各脏器内的含量,并做血清汞和脏器汞含量的相关性分析。结果]在低剂量甲基汞作用下,亲仔两代未出现明显的毒性反应。随着染毒剂量的增加,亲仔两代小鼠血清中的总汞含量增加,对照组、低剂量组和高剂量组母鼠血清中总汞含量分别为1.228、2.358和6.195μg/L,仔鼠为0.801、3.217和3.763μg/L,高剂量组和对照组间差别有显著性(P<0.05);随着染毒剂量的增加,各脏器中的总汞含量也增加,对照组、低剂量组和高剂量组母鼠肾脏总汞含量分别为13.890、25.780、253.980ng/g组织湿重,肝脏为3.710、11.520、100.820ng/g组织湿重,脑组织为2.820、3.070、23.810ng/g组织湿重;对照组、低剂量组和高剂量组仔鼠肾脏总汞含量分别为6.940、13.090、102.170ng/g组织湿重,肝脏为2.660、5.450、38.850ng/g组织湿重,脑组织为1.600、2.660、8.120ng/g组织湿重;母鼠和仔鼠脏器中总汞蓄积的模式一样:肾脏>肝脏>脑组织。在低剂量下,母鼠血清总汞含量与肝脏、肾脏、脑组织中的总汞含量的相关系数分别为0.830、0.967、0.802;在高剂量下,与肝脏、肾脏、脑组织的相关系数分别为0.997、0.833、0.850,均有较高的相关性(P<0.05)。而仔鼠在高剂量下血清总汞与肝脏、肾脏、脑组织的相关系数分别为0.737、0.672、0.702,其血清总汞和脏器总汞也有相关性(P<0.05);在低剂量时血清总汞与肝脏、肾脏、脑组织总汞的相关系数分别为0.040、0.300、0.080,没有相关性(P>0.05)。结论]母鼠接触低剂量甲基汞即可在亲仔两代各脏器中蓄积,亲代血清总汞含量和脏器总汞含量具有明显的相关性;仔代在高剂量时血清总汞含量和脏器总汞含量有明显的相关性,而在低剂量下无相关性。

Distribution of Mercury in Various Organs of Maternal Mice and Offspring after Maternal Mice Treated with Methylmercury

Objective] To study the distribution of total mercury in organs and serum of maternal and offspring,ICR mice were administrated with low dose of methylmercury by drinking water. Methods] The pregnant ICR mice were exposed to 0.00, 0.01 and 0.10 mg/L methylmercury respectively from the 6th day after conception to postnatal day 21,then total mercury in several organs of maternal mice and their offspring were detected by hydride generation-atomic fluorescence spectrometry. Results] There was no observed defects in low-dose group,the total mercury in the organs of maternal mice and their offspring increased with the dose of methylmercury,and the difference between the control and high-dose group was significant (P < 0.05).The distribution of total mercury in maternal mice and their offspring was the same as in following sequence: kidney>liver>brain. The concentration of total mercury in serum of maternal mice correlated well with that in other organs (P < 0.05),and so did in the offspring in high- dose group,but there was no significant difference in low-dose group (P >0.05). Conclusion] Mercury could be accumulated in organs of offspring even the maternal mice were exposed to low dose methylmercury. The correlation of total mercury in serum and organs of maternal mice was significant,that of offspring in high dose was significant,but there was no significance in low-dose group.