Specific lysis of GABAergic synaptosomes by an antiserum to glutamate decarboxylase

An antiserum to pure glutamate decarboxylase (GAD) when incubated with rat cortical synaptosomes in the presence of complement caused release of 33-53% of lactate dehydrogenase (LDH) and 22-41% of total GAD. In addition most of the gamma-aminobutyrate (GABA) present was released. Anti-GAD antiserum alone, or complement alone, were without action. The antiserum plus complement had no effect on noradrenaline or choline uptake, and did not release choline acetylase (ChAT). Anti-ChAT serum plus complement released 30-37% of ChAT and 10-13% of LDH. It prevented choline uptake. This serum did not produce GAD release or prevent GABA, choline or noradrenaline uptake. When cortical synaptosomes were exposed to both antisera plus complement, their actions were strictly additive. The data indicate specific lysis of GABAergic and cholinergic synaptosomal sub-populations.     

人骨骼肌α辅肌动蛋白（α－actinin）的提取及其抗血清的制备和鉴定

本文提取人骨骼肌α辅肌动蛋白（α－ａｃｔｉｎｉｎ）是综合了文献报导有关提取兔肌α－ａｃｔｉｎｉｎ的和提取鸡胗α－ａｃｔｉｎｉｎ的方法,稍加修改而确定的。用Ｈａｓｓｅｌｂａｃｈ－Ｓｃｈｎｅｉｄｅｒ缓冲液提取骨骼肌中的肌球蛋白后,将残余物经硼酸－缓冲液提取、匀浆及高速离心去掉肌动蛋白和肌原纤维的其它成份,上清加硫酸铵至３０％,３５％饱合度所得的沉淀用２２０ｍｍｏｌ／ＬＴｒｉｓ－乙酸溶解、透析、离心后经ＤＥ－５２柱层析可得电泳纯。α－ａｃｔｉｎｉｎ。将人骨骼肌α－ａｃｔｉｎｉｎ纯化制品免疫了三只大耳白纯种家兔,两个多月后,三只兔子都产生免抗人骨骼肌α－ａｃｔｉｎｉｎ的特异抗血清,用双向免疫扩散法和酶联免疫吸附试验（ＥＬＩＳＡ）测定,产生的抗体效价较高,用双扩散法测定效价为１：３２,用ＥＬＩＳＡ测定,用比率法判断结果,效价最高者为１：１００,０００左右,经免疫电镜观察结果证实,上述抗血清可以满足进一步实验要求。     

骨骼肌M蛋白抗血清的制备及正常人骨骼肌M蛋白的免疫电镜定位

分别制备了兔抗人Ｍ蛋白（Ｂ成分）抗血清和兔抗人Ｃ成分［１］抗血清。用蛋白Ａ－胶体金作标记物,对经ＬｏｗｉｃｒｙｌＫ４Ｍ低温包埋的人骨骼肌超薄切片中Ｍ蛋白和分子量１４００００的Ｃ成分进行免疫电镜定位。发现Ｍ蛋白分布于整个Ｍ线,而Ｃ成分虽然也集中于Ｍ线以内,但主要分布于Ｍ线内的边缘区域。     

草鱼垂体生长激素分离纯化及其抗体制备的研究

应用碱性抽提,亲和层析,凝胶过滤和离子交换层析等技术从草鱼垂体中分离提纯出纯度高的草鱼生长激素（ｇｃＧＨ）用酶联免疫吸附测定法（ＥＬＩＳＡ）检测表明草鱼ＧＨ与大马哈鱼ＧＨ抗血清具有明显的免疫交叉反应,而与大马哈鱼催乳素（ＰＲＬ）抗血清没有交叉反应,聚丙烯酰胺凝胶电泳表明草鱼ＧＨ为单一蛋白带,其分子量约为２２５００道尔顿,等电聚焦揭示出草鱼ＧＨ主要由等电点为４．７和５．０的两条蛋白带组成,用纯化的草     

Immunochemical study on PHI/PHM with use of synthetic peptides

We have synthesized PHI and PHM (human PHI) as well as their fragments, PHI (1-6), PHI (1-15), PHI (14-19), PHI (14-27), PHI (20-27), PHM (1-15) and PHM (13-27), by the solution or solid-phase method for peptide synthesis. Using the highly purified synthetic peptides as immunogens or haptenic immunogens, five kinds of PHI/PHM specific antisera were produced. The major antibody-recognition sites of the five antisera were located respectively in the PHI C-terminal (R8201), in the PHI N-terminal (R8403), in the PHM C-terminal (R8502), and in the PHM whole molecule (R8702 and R8703). Radioimmunoassays (RIAs) with antisera R8201, R8403 and R8502, respectively, showed a wide distribution of immunoreactive (IR) PHI/PHM in porcine and human gastrointestinal and brain tissues. The concentrations of IR-PHI in the porcine gastrointestinal tissues, however, differed between the R8201 and R8403 RIAs employed for measurement. By using these two different PHI RIAs, the IR-PHI in the porcine brain tissue extract was shown to be almost a single component coeluting with synthetic PHI in gel filtration. The IR-PHI in the extract of porcine lower intestine on the other hand, contained, besides a PHI-like component, unidentified component(s) eluting immediately after synthetic PHI in gel filtration; this crossreacted with the PHI C-terminal specific R8201 antiserum but not with the N-terminal specific R8403 antiserum, suggesting the presence of the C-terminal-related fragment(s) of PHI in the tissues.     

Conservation of interphase chromatin nonhistone antigens as components of metaphase chromosomes

The degree of conservation of HeLa interphase chromatin nonhistone antigens among the nonhistones of isolated metaphase chromosomes was determined with immunological procedures. Proteins were separated on SDS-polyacrylamide gels and electrophoretically transferred to diazophenylthioether (DPT)-paper, which was then overlaid with antiserum to chromatin from interphase nuclei. The bound antibodies were detected with 125I-labeled protein A. Alternatively, polyacrylamide gels were directly overlaid with antiserum and with 125I-protein A. Densitometry of autoradiograms and stained gels revealed the degree of conservation of nonhistone antigenic determinants from interphase to metaphase to be over 90% for chromatin.     

大蒜病毒检测用抗血清制备的研究

本文报告了从阿城大蒜田间感染病叶片中分离了大蒜病毒,用聚乙二醇沉淀法提取的抗原浓度高于差速离心法.制备的抗血清效价达1024以上.电镜观察粗提纯的病毒粒子,呈线状,长度为516～846nm占46.9%,1142～1525nm占40.6%.     

大鼠骨骼肌多催化功能蛋白酶的提取、鉴定及其抗血清的制备

为了研究多催化功能蛋白酶（ｍｕｌｔｉｃａｔａｌｙｔｉｃａｌｐｒｏｔｅｉｎａｓｅ,ＭＣＰ）在负氮平衡形成中的作用,以大鼠骨骼肌为原料,提取此酶并制备其抗血清．将大鼠骨骼肌粗提物经４５％～６５％饱和度硫酸铵分级盐析、阴离子交换层析和凝胶过滤,最后从Ｓｅｐｈａｒｏｓｅ４Ｂ层析柱上获得单一活性洗脱峰．酶活性用Ｃａｒｂｏｂｅｎｚｏｘｙ－Ｖａｌ－Ｇｌｙ－Ａｒｇ－４－ｎｉｔｒｉｎｉｌｉｄｅａｃｅｔａｔｅ作底物检测．非变性ＰＡＧＥ银盐染色显示单一区带的骨骼肌多催化功能蛋白酶,ＳＤＳ－ＰＡＧＥ银盐染色显示１０条亚基电泳区带,分子量在２５～３２ｋＤ之间．纯化的酶免疫兔８周后,抗血清效价达１３２,用分级盐析和离子交换层析纯化抗血清,显示单一电泳区带的ＩｇＧ．Ｗｅｓｔｅｒｎ－ｂｌｏｔ分析显示只在２５～３２ｋＤ之间出现多条亚基区带．这些结果提示已获得电泳纯ＭＣＰ及其较高特异性的多克隆抗体．     

一种蛋白质B细胞表位展示系统的构建及验证

目的:建立一种能够有效展示蛋白质B细胞表位的载体系统,以用于表位特异性抗体的制备和表位疫苗的设计。方法:选用抗体的可变区作为蛋白质B细胞表位展示的骨架蛋白,B细胞表位的展示部位为CDR3区。全基因合成骨架蛋白基因,通过重叠PCR将B细胞表位编码序列插入到骨架蛋白基因中,原核表达目的蛋白,利用Sephacryl S-100层析柱进行蛋白纯化,用纯化的蛋白按常规方法免疫小鼠,采用ELISA法检测免疫血清的滴度及特异性,通过Western blot和间接免疫荧光技术进一步验证免疫血清对目的蛋白的识别。结果:成功构建了3种表位展示蛋白,均表现出了很好的抗原性,表位展示蛋白免疫血清具有较好的特异性,能够特异识别所展示的B细胞表位。结论:抗体可变区作为骨架蛋白能够很好地展示B细胞表位,免疫小鼠后获得的免疫血清表现出了较好的特异性。