氯化镍染毒对小鼠外周血网织红细胞微核形成的影响

目的研究氯化镍(NiCl2)诱导小鼠外周血网织红细胞微核形成的作用.方法将30只健康的成年雄性NIH小鼠随机分为6组,设生理盐水对照组、秋水仙素阳性对照组(剂量为0.75 mg/kg)、环磷酰胺阳性对照组(剂量为40.0mg/kg)和NiCl2染毒组(剂量分别为5.0、10.0、20.0 mg/kg),分2次腹腔注射染毒,间隔24 h,每次按0.1 ml/10 g体重腹腔注射.采用转铁蛋白受体荧光抗体和碘化丙碇染色,以疟原虫感染小鼠外周血红细胞为微核生物模型,调校流式细胞仪,检测秋水仙素、环磷酰胺和0、5.0、10.0、20.0 mg/kg NiCl2染毒后小鼠外周血含微核网织红细胞率的变化.结果秋水仙素和环磷酰胺染毒小鼠的外周血含微核网织红细胞率均明显高于对照组小鼠(P＜0.01),但不同剂量NiCl2染毒小鼠外周血含微核网织红细胞率均未见明显升高(P＞0.05).结论该研究条件下未观察到氯化镍有明显的诱导小鼠外周血网织红细胞微核形成的作用.

Analysis of Micronuclei Induced by Nickel Chloride in Peripheral Blood Reticulocytes in Mice Using Flow Cytometry

Objective To detect micronuclei (MN) induced by nickel chloride (NiCl2) using a flow cytometry-based method, so as to study the mutagenecity of this chemical. Methods The micronucleated reticulocytes (MN-RET) in peripheral blood of NIH mice exposed to 0.75 mg/kg colchicines (COL), 40.0 mg/kg of cyclophosphamide (CP) and 5.0, 10.0 and 20.0 mg/kg of NiCl2 were detected by a flow cytometry-based method, in which anti-CD71-FITC and PI were used to stain cells and malaria-infected erythrocytes were employed as biological standards of micronuclei to optimize cytometry. Results Although COL or CP induced significant increase in the frequency of MN-RET in peripheral blood, MN formation in peripheral reticulocytes was not significantly affected by exposing to different concentration of NiCl2. Conclusion The results of flow cytometric analysis in the present paper do not support that NiCl2 exposure may induce significant MN-RET increase in peripheral blood in NIH mice.