大鼠全血、毛发与其组织脏器中轻稀土元素含量相关性研究

目的研究稀土元素在大鼠组织脏器内的蓄积,评价全血和毛发可否作为稀土暴露水平的生物标志物。方法以雄性SD大鼠为试验对象,适应性喂养1周后剃去大鼠毛发,随机分为对照组和柠檬酸稀土低、中、高-I、高-II剂量组(共5组,每组10只)。对照组用35%柠檬酸钠溶液灌胃,其它各组用柠檬酸稀土溶液灌胃,剂量分别为50、500、5000(高-I)、5000(高-II)mg/kg bw。灌胃4周后,除高剂量II组外,其余各组大鼠处死并采集毛发、全血、肝脏、脾脏、股骨等组织脏器。高剂量II组大鼠停药并自由饲养4周后处死,采集同前所述的所有组织器官样品。用电感耦合等离子体质谱(ICP-MS)法测定大鼠毛发、全血、肝脏、脾脏、股骨中La、Ce、Pr、Nd、Sm、Eu轻稀土元素含量。结果稀土元素在组织脏器的蓄积浓度依次为:毛发>肝脏>脾脏>股骨>全血;稀土元素在毛发中的含量与肝、脾及股骨中含量均呈显著正相关,而在全血中的含量仅与脾脏和股骨中含量呈正相关。结论大鼠毛发中稀土元素含量与肝脏、脾脏及股骨显著正相关,比全血更适合作为稀土暴露水平的生物标志物。

Correlation of light rare earth elements in rats hair, blood and organs

OBJECTIVE: To study the correlation of rare earth elements (REEs) in the rats' hair, blood and organs. METHODS: Based on the level of animal weights, 50 healthy male SD rats were randomly divided into five groups including control group and four Citrate REEs level groups (low, middle, high-I and high-II). Before the experiment, the hair of rats' back was eliminated. After the rats were fed for four weeks, the fresh hair of the rats was collected. Except the high-II group, the blood and organs of the others were collected. The high-II group was fed for other four weeks without Citrate REEs. At the end of eighth week, hair, blood and organs of the high-II group were collected. Determination of light REEs concentration in the rats' hair, blood, liver, spleen and bone by ICP-MS. RESULTS: The correlation coefficients of REEs concentration between hair and organs (such as liver, spleen and bone) were more than 0.5, while those of REEs concentration between blood and organs (such as liver spleen and bond) were less than 0.5. In the group H- Il, the Rees concentration in blood, hair, liver, spleen and bone were all decrease, and the REEs concentration of blood was close to that of the control groups. CONCLUSION: The concentrations of REEs in these organs were different. And hair was better than blood as a biomarker to reflect body exposure of REEs.