摘要
目的探讨急性镉暴露对大鼠白细胞免疫功能及血浆白细胞介素_2(IL_2)和皮质醇水平的影响。方法取36只雄性成年SD大鼠 ,随机分为3组 ,即对照组、实验Ⅰ组、实验Ⅱ组 ,每组12只 ,分别按0、0.5、1.0mg/kg腹腔注射CdCl2,连续7d。分别在注射后第4天和第7天宰杀大鼠,采集血样。结果在整个实验期内 ,Ⅰ、Ⅱ组大鼠体重均非常显著地低于对照组 (P<0.001) ;白细胞总数均高于对照组 ;Ⅰ、Ⅱ组的嗜中性粒细胞和淋巴细胞分别在染毒第7天明显高于和低于对照组 (P<0.05) ,而单核细胞、嗜酸性粒细胞、嗜碱性粒细胞则变化无显著性 (P>0.05) ;Ⅰ、Ⅱ组血中T淋巴细胞和IL_2水平低于对照组 ,B淋巴细胞高于对照组 (P<0.05) ;Ⅰ、Ⅱ组血浆皮质醇水平在染毒第7天高于对照组 (P<0.05)。结论急性镉暴露可影响白细胞免疫功能 ,引起细胞免疫功能低下 。
Objective To study the effects of acute cadmium exposure on the immune function of white blood cells (WBC), plasma interleukin-2 (IL-2) and cortisol levels in rats. Methods Thirty-six male rats were randomly divided into three groups averagely. The control group (group C) and two experimental groups(groupⅠand group Ⅱ) were respectively exposed to 0, 0.5, 1.0 mg / kg body weight (BW) cadmium for 7 days by intraperitoneal injection. Blood samples of the rats were collected on the 4th and 7th day after administration of cadmium respectively and the related parameters were analyzed. Results The BW of rats in groupⅠand group Ⅱ were significantly lower than that of the group C. The WBC counts of two experimental groups were higher than that of the control group. Higher percentage of neutrophiles and lower percentage of lymphocytes were observed in rats of group Ⅰ and Ⅱ on the 7th day after cadmium exposure, while no obvious variations in monocytes(%), eosinophiles(%) and basophiles(%)were observed among the three groups. Blood T-lymphocyte(%) and IL-2 levels in rats of groupⅠandⅡdecreased on the 4th and 7th day after cadmium exposure respectively, while B-lymphocyte(%) increased on the contrary. Plasma cortisol levels in rats of groupⅠ and groupⅡ were higher than that of the group C on the 7th day after cadmium exposure. Conclusion The results showed that acute cadmium exposure could affect the WBC immune function and result in the defect of cellular immune function as well as significant change of adrenal cortex endocrine activities.
出处
《环境与健康杂志》
CAS
CSCD
北大核心
2002年第5期364-366,共3页
Journal of Environment and Health
基金
江苏省应用毒理重点实验室开放基金资助项目(K99057)
