可溶性抗HAV抗体Fab片段的原核表达

0　引言　甲型肝炎病毒 (HAV)是危害人类健康的致病原之一 ,目前已有多种用于接触前预防的甲肝疫苗 ;但对于接触后预防或短期到 HAV高流行区的旅游者的预防 ,则多采用免疫球蛋白作被动免疫 .在接触后 (14d内 )和潜伏期早期 ,注射免疫球蛋白预防甲肝的有效率达 85 %左右 .血源性免疫球蛋白虽然效价高 ,应用效果好 ,但可能被血源病原体污染 .因此基因工程人源抗体有望成为接触后预防的首选制剂 .我们从人源噬菌体抗体组合文库中筛选到一株甲肝特异性抗体 [1 ] ,在此基础上构建了可溶性表达载体 ,并获得可溶性表达 ,为该抗体的进一步研究打…     

测定咖啡因代谢物评价 N-乙酰转移酶、CYP1A2和黄嘌呤氧化酶活性

目的是对中国人N-乙酰化酶(NAT2)、CYP1A2酶和黄嘌呤氧化酶(XO)的活性进行分析。120名健康志愿者饮用3杯咖啡后于4～5h留尿,用HPLC方法测定尿中5种咖啡因主要代谢物浓度,即5-乙酰胺基-6-甲酰胺基-3-甲基尿嘧啶(AFMU)、1-甲基黄嘌呤(1X)、1-甲基尿酸(1U)、1,7-二甲基尿酸(17X)、1,7-二甲基黄嘌呤(17U)。其中N-乙酰化酶活性用AFMU/1X或AFMU/(AFMU+1X+1U)表示;CYP1A2酶活性指标采用(AFMU+1X+1U)/17X或AFMU+1X+1U)/17U;XO酶活性指标采用1U/1X或1U/(1X+1U)。结果表明,N-乙酰化酶活性呈两态分布,慢代谢者占16.7%,CYP1A2和XO酶活性呈对数正态分布,其代谢比值与国外文献报道一致。提示通过测定咖啡因代谢物比值,可以进行NAT2酶、CYP1A2酶和黄嘌呤氧化酶活性分析。     

槲寄生化学成分的研究 Ⅶ.槲寄生新甙Ⅶ的分离和结构

自中药槲寄生中分离得到一个新的黄酮甙,经波谱测定及水解试验,确定其结构为鼠李秦素-3-O-β-D-芹糖基(1→2)-[6″-(3-羟基-3-甲基戊二酸半酯)]葡萄糖甙,命名为槲寄生新甙Ⅶ(viscumneoside Ⅶ).     

萘甲异喹的降压作用

五十年代后期就有粉防己碱(Tet)降压作用的报道,近年研究表明它有钙拮抗作用。但由于其来源困难,又难以合成,临床应用受到限制。萘甲异喹(naphthylmethyl isoquinoline NI)系Tet改构后的化合物,本文研究了NI对正常和高血压动物的降压作用并对其降压机理作了初步探讨。     

Role of free radicals and antioxidants in nasal polyps

OBJECTIVES/HYPOTHESIS: The aim of this study is to determine the role of free radicals and antioxidants in nasal polyps. STUDY DESIGN: Prospective, randomized, controlled study. METHODS: Thirty-one patients with nasal polyposis and a control group consisting of 19 patients with septal deviation and lower turbinate hypertrophy were included in the study. Levels of the antioxidants retinol, beta-carotene, alpha-tocopherol, and ascorbic acid were measured from the sera of the patients with nasal polyposis and the control group. Plasma levels of superoxide dismutase activity (SOD), glutathione peroxidase (GSHPX) activity, and reduced glutathione (GSH) were also obtained. As a peroxidation product, the levels of the malondialdehyde-thiobarbituric acid (MDA) combination were measured from the plasma of patient and control groups. Measurements of MDA, GSH, and alpha-tocopherol levels were also taken from the polyp tissue and turbinate mucosa of the control group. RESULTS: The blood levels of antioxidants and MDA as an oxidant were significantly different in the patient group compared with the control group (P <.01). The tissue levels of antioxidants and MDA were significantly different in the patients with polyposis compared with the control group (P <.01). The blood and tissue anti-oxidant levels were found to be decreased, and MDA levels as an oxidant increased significantly in the patient group with polyposis when compared with the control group, and there was a negative correlation between oxidative stress and antioxidants. CONCLUSION: This study demonstrates that oxidative stress and tissue and blood antioxidants in the patients with polyposis were significantly different compared with the control group. The blood and tissue antioxidant levels decreased, and MDA levels, as an oxidant, increased significantly in the patient group with polyposis when compared with the control group. The current study demonstrates that there is strong evidence related to oxidative stress in the pathogenesis of nasal polyposis, and antioxidants can have a preventive role in free-radical-mediated tissue damage in nasal polyposis.     

IS6110-PCR分型方法用于安徽、湖南、江苏三省结核病分子流行病学的初步研究

目的了解安徽、湖南、江苏省结核分支杆菌的基因型状况及其分子流行病学规律。方法以结核分枝杆菌插入序列IS6110序列为模板,设计一对特异外向引物,建立一种结核分枝杆菌的快速分子生物学分型方法——IS6110PCR分型方法,进行三省结核病分子流行病学研究。结果根据IS6110PCR指纹图谱,191株安徽、湖南和江苏三省的结核分枝杆菌菌株可被分成6个主要的基因型(Ⅰ,Ⅱ,Ⅲ,Ⅳ,Ⅴ和Ⅵ),江苏省的主要基因型为I和V型,安徽省的主要基因型为III型,湖南省的主要基因型为I和II型,V型菌株全部为江苏省菌株,IV型菌株全部为湖南省菌株。结论三省之间结核分支杆菌的基因型存在明显的差异,各自存在着独立的流行菌型,其真实原因有待进一步研究。