细胞自噬提高抗原呈递细胞内抗原呈递效率的研究进展

从细胞自噬、自体吞噬体、吞噬小体MHC-Ⅱ类抗原处理、TLR信号传导和细胞自噬对吞噬小体成熟及其处理抗原的调节等方面,就细胞自噬现象可提高病原菌在吞噬小体内的抗原呈递效率进行了综述.     

重组酿酒酵母表达乙肝表面抗原过程的限制性步骤

考察了重组酿酒酵母表达乙肝表面抗原（HBsAg）的限制性步骤，发现在对数生长期的中后期，与发酵初期相比，外源质粒的拷贝数下降了40%，此后质粒烤贝数在低水平保持稳定。在发酵过程中添加乙醇胺，抗原基因启动子的转发效率下降了24%，但抗原效价上升了31%，说明HBsAg表达的主要限制步骤在抗原多肽的翻译和颗粒形成的后加工过程。     

一种制备过氧化物酶的新方法

以meso-四(α,α,α,α-O-苯乙酰苯)卟啉为抗原,通过动物免疫、细胞融合等技术筛选细胞株3E4.该细胞株产生的抗体具有结合铁卟啉的能力,且表现出过氧化物酶的活力.该抗体对抗原和铁卟啉的亲和常数为3.65×10-9和8.20×10-8.抗体-铁卟啉复合物催化反应时,得到比活力为46.875U/mg,为天然HRP的18.99%.     

传染性支气管炎病毒血凝抗原的制备

目的利用磷脂酶C处理，制备传染性支气管炎病毒（IBV）血凝抗原。方法将IBV接种9日龄SPF鸡胚，48h后收获尿囊液，经过高速离心浓缩，利用胰酶、产气荚膜梭状芽孢杆菌培养液（含磷脂酶C）处理后，进行常规血凝和血凝抑制试验。结果经过胰酶处理的IBV具有非常强的非特异性。而经过磷脂酶C处理的IBV，该凝集作用可被特异的IBV抗血清所抑制，而不能被ILTV、NDV、Adeno-1和Adeno-3，APIV、AIV、IBDV、HP、MS和MG等抗血清所抑制。结论磷脂酶C处理的IBV，可以用于血凝抑制试验。     

Expression of hepatitis B surface antigen gene (HBsAg) in Laminaria japonica (Laminariales, Phaeophyta)

A transformation model for Laminaria japonica was established from 1993 to 1998, on the basis of which the transgenic kelp with heterologous gene encoding hepatitis B surface antigen (HBsAg) was obtained by using the micro- particle bombardment transformation method. Results of quantitative ELISA showed that HBsAg in transgenic kelp was 0.529 μg/mg soluble proteins on average and the highest value was 2.497 μg/mg, implying that recombinant HBsAg had natural epitope. Further support for the integration of HBsAg gene into kelp genome was obtained by PCR- Southern and total DNA hybridization. Prospect of kelp bioreactor producing high value materials such as edible HBV vaccine was discussed as well.     

环境监测中的化学发光免疫分析研究

本文对环境监测中的化学发光免疫分析的关键技术和研究进展作了较详细的综述。引用文献91篇。     

家禽三联多表位抗原蛋白的预测

采用生物信息学的知识和表位预测方法对家禽新城疫病毒、传染性法氏囊病毒和传染性支气管炎病毒三种传染性病原体的抗原表位，进行了预测，并对重组抗原进行了预测，为三联多表位疫苗研究奠定基础．     

基于GO-AuNPs@Ru(bpy)_3~(2+)的无标记型癌胚抗原电化学发光适配体传感器

纳米金(AuNPs)与联吡啶钌(Ru(bpy)_3~(2+))通过静电作用形成AuNPs@Ru(bpy)_3~(2+)纳米复合物.将该复合物组装在氧化石墨烯(GO)纳米片上,形成了可用于电化学发光检测的基底材料GO-AuNPs@Ru(bpy)_3~(2+).利用链霉亲和素(SA)分子可与4个生物素(biotin)分子相结合且二者的亲和力高的特点,再与识别元素相结合,实现了信号的放大.基于以上两点,利用适配体构建了无标记型适配体传感器,实现了癌胚抗原的灵敏检测.传感器的线性范围在1.0fg/L~10.0pg/L之间,检出限为0.4fg/L.将该方法成功应用于人血清样品中癌胚抗原的测定,RSDs不大于8.3%,回收率在80.0%~108.0%之间.     

Fibrocytes: a unique cell population implicated in wound healing

Following tissue damage, host wound healing ensues. This process requires an elaborate interplay between numerous cell types which orchestrate a series of regulated and overlapping events. These events include the initiation of an antigen-specific host immune response, blood vessel formation, as well as the production of critical extracellular matrix molecules, cytokines and growth factors which mediate tissue repair and wound closure. Connective tissue fibroblasts are considered essential for successful wound healing; however, their origin remains a mystery. A unique cell population, known as fibrocytes, has been identified and characterized. One of the unique features of these blood-borne cells is their ability to home to sites of tissue damage. This article reviews the identification and characterization of fibrocytes, summarizes the potential role of fibrocytes in the numerous steps of the wound-healing process and highlights the potential role of fibrocytes in fibrotic disease pathogenesis.Received 25 November 2002; received after revision 31 December 2002; accepted 16 January 2003