目的 应用优化的HIV-1 gp41基因,通过原核表达得到高纯度的重组HIV-1 gp41抗原,制备基于重组gp41抗原的尿液HIV-1抗体检测试剂盒,并评价此试剂盒在尿液抗体检测中的灵敏度和特异性.方法 将编码HIV-1B亚型gp41主要抗原表位的基因插入到原核表达载体pET22b中,构建表达质粒pET22b-mgp41.将表达质粒转化B121(DE3)后经IPTG诱导其表达重组抗原rgp41.重组抗原经镍离子亲和层析和分子筛层析得到纯化.将纯化后重组抗原包被ELISA板,对4796份正常人群尿液、641份HIV-1抗体阳件感染者尿液进行HIV-1抗体检测.结果重组抗原经纯化后纯度95%.用本实验中制备的HIV-1抗体尿液检测试剂盒的检测结果显示,此试剂盒灵敏度为100%,特异性为98.52%.结论 本研究中制备的HIV-1尿液诊断试剂盒可以满足HIV感染者初筛实验的需要.%Objective To establish a specific and sensitive Enzyme-linked immunosorbent Assay(ELISA)kit for detection of HIV-1 antibody in urine using Escherichia coli expression products as coating antigen. Methods The truncated HIV-1 gp41 gene fragment of major antigenic epitopes was inserted into the plasmid pET22b to obtain expression plasmid pET22b-mgp41. The recombinant antigen was expressed in BL21 (DE3) strains of Escherichia coli and was purified by immobilized metal chelation and gel filtration chromatography. Using this antigen as coating antigen, a HIV-1 urine antibody ELISA kit was developed. In order to examine the clinical utility of the kit, 5437 urine samples were assayed, which consisted of 641 urine samples from HIV infected patients and 4796 samples from normal subjects. Results The purity of purified antigen is up to 95%. Anti-HIV antibodies were detected in all the urine samples from HIV infected patients, and the diagnostic sensitivity for HIV-1 infection was 100%. In healthy control group, 71 cases showed false positive, the specificity was 98.52%.Conclusion The HIV-1 urine antibody kit can be used in screening and diagnosing for HIV-1 infection.
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