丙肝核酸疫苗免疫的CTL活性检测

目的 :探讨丙肝核酸疫苗的细胞免疫应答效果。方法 :用丙肝核酸疫苗pSVL HCV C +E1 通过皮下注射途径免疫BALB C小鼠 ,以绿色荧光载体重组体pEGFP N1 HCV C +E1 转染的小鼠骨髓瘤细胞SP2 0作为靶细胞 ,采用51 Cr释放法 ,以(Na) 2 51 CrO4 标记靶细胞进行标准的 4h杀伤试验检测其CTL活性。结果 :CTL杀伤率达 4 0 7%。结论

The quantitative expressions of lymphangiogenic factors and metastasis in human colorectal cancers

Objective： The purpose of this paper was to study the expression levels of newly described lymphatic endothelial markers – LYVE-1, Prox-1, podoplanin and 5’-nucleotidase, and their correlation with metastasis of human colorectal cancers. Methods： Tumor and corresponding tumor-side normal tissue samples were obtained from resected specimens immediately after operation. Expression level of each factor was determined by quantitative real-time PCR （RT-PCR） and Western blot technique. Results： Expression levels of lymphatic endothelial markers LYVE-1, Prox-1, podoplanin and 5’-nucleotidase were significantly different in tumor and tumor-side normal groups. Expression levels of Prox-1 and podoplanin were higher in patients with positive lymph node metastasis than those without metastasis. LYVE-1, but not 5’-nucleotidase expression level was higher in both cancer and normal groups. Conclusion： These results indicate that combined quantitative analysis of lymphangiogenic markers LYVE-1, Prox-1 and podoplanin in colorectal cancer specimens may be useful in predicting metastasis of colorectal cancer to regional lymph nodes. However, the role of 5’-nucleotidase in predicting metastasis of colorectal cancer still remains to be further analyzed.

聚合酶链反应在检测慢性HBsAg携带者血清HBV-DNA传染性研究中的应用

聚合酶链反应是一种对特定的DNA片段在体外进行快速扩增的新方法 ,操作简便 ,具有高度特异性和敏感性的生物学新技术。我们将其用于检测慢性HBsAg携带者血清HBV DNA ,研究其传染性和酶联免疫吸附技术(ELISA)检测血清HBsAg作对比。实验结果证明 ,聚合酶链反应直接检测血清HBV DNA比ELISA检测血清HBsAg更加敏感特异。在被检测的 1 2 31份血清标本中 ,用ELISA检出 91 9份慢性HBsAg携带者 ,血清HBsAg呈阳性结果。聚合酶链反应检测血清HBV DNA亦阳性 ,两者结果一致。而ELISA检测HBsAg阴性的 31 2份血清中 ,用聚合酶链反应检测又有 2 70份 (86 .5 %)可检测出HBV DNA ,总检出率 96 .6 %。此组研究证实血清HBsAg阴性标本仍有HBV DNA存在 ,具有传染性。琼脂糖凝胶电泳法比较简便 ,结果易观察。