Cytotoxicity of fullerenols on Tetrahymena pyriformis

With the increasing use of fullerenes and their derivatives in a variety of fields, the toxicity and effects of fullerenes on humans and the environment have received considerable attention. In this study, the cytotoxicity of fullerene derivative, C60(OH)x, on Tetrahymena pyriformis was investigated. Cell growth inhibition was evaluated by counting with an optical microscope, and the generation time was calculated. It was indicated that the fullerenols caused a dose-dependent growth inhibition of the cells. The morphologic change in the damaged macronucleus of cells was observed using a fluorescent microscope. Superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), and glutathione reductase (GR) levels were also measured for Tetrahymena pyriformis, using conventional methods. The results showed that fullerenols could reduce GSH-PX and GR activities. But no noticeable difference in SOD ac- tivity was observed between the treated groups and the control group. This indicated that the antiproliferative effect of fullerenols might be mediated by the reduction in the activities of GSH-PX and GR of cells and the destruction of the macronucleus.

静注人免疫球蛋白产品中活化Ⅺ因子活性凝血酶生成试验检测方法的建立

目的建立静注人免疫球蛋白(intravenous immunoglobulin,IVIG)中活化Ⅺ因子(activated factorⅪ,FⅪa)活性凝血酶生成试验(thrombin generation assay,TGA)的测定方法。方法采用自动校正凝血酶生成(calibrated automated thrombogram,CAT)分析仪,建立IVIG中FⅪa活性检测方法,并确定方法的线性范围和检测限,验证方法的精密度和准确性。采用建立的方法对4家血液制品公司的29批IVIG产品进行FⅪa活性定量测定。结果 FⅪa浓度在3. 34～27. 84 mIU/mL范围时,与凝血酶峰值浓度(peak thrombin concentration,PTC)呈良好的线性关系,回归方程为Y=-0. 022 8 X^2+1. 891 6 X+10. 282,R^2=0. 989;检测限为2. 76 mIU/mL;供试品的6次测定结果 RSD为12. 9%;低、中、高浓度加标样品的回收率分别为86. 7%、116. 7%、121. 6%,RSD分别为16. 4%、19. 8%、8. 4%。29批IVIG产品中,不同厂家及相同厂家不同批次间FⅪa活性均存在一定差异。结论建立了用于检测IVIG产品中FⅪa活性的TGA方法,且具有良好的线性、精密性及准确性,可用于评价IVIG产品的致血栓风险。