抗人血管内皮细胞单克隆抗体的制备及其在血管内皮细胞分型上的可能应用

目前国外已有制备抗人血管内皮细胞(VEC)单克隆抗体(McAb)成功的报道。但国内尚无这方面的报导。国外一些实验室所制得的抗人VEC的McAb,有的与单核细胞或(和)淋巴细胞具有交叉反应,有的作用于细胞质抗原而非膜抗原。Cerilli认为,VEC具有独特的非HLA抗原,而外周血单核细胞也具有这种VEC抗原系统。迄今尚未有人尝试     

重组Rab8截短体蛋白的原核表达、纯化和抗体制备

目的 获得Rab8纯化蛋白,制备多克隆抗体,为深入研究Rab8在病毒感染宿主细胞过程中的作用奠定基础.方法 首先从HepG2细胞中克隆Rab基因,然后从Rab8质粒中亚克隆Rab8 C端编码122个氨基酸的基因片段,构建Rab8与6His的融合蛋白原核表达质粒.原核表达与蛋白纯化后,免疫动物,制备Rab8多克隆抗体.采用ELISA法检测其效价.Western检验抗体特异性,间接免疫荧光染色法验证其免疫组化特性.结果 克隆了人Rab8编码基因,构建了表达Rab8 C端编码122个氨基酸的原核表达质粒pQE31-Rab8-122,经过大肠杆菌表达、镍亲和层析柱纯化,获得相对分子量约15 000的融合蛋白,免疫Balb/c小鼠后收获抗血清.ELISA显示抗体效价达1/20 000.Western blot和免疫荧光染色结果显示此多克隆抗体能够与原核表达的Rab8蛋白发生特异性反应,并能够识别HepG2细胞中内源性Rab8蛋白.结论 本研究获得原核表达的Rab8纯化蛋白,成功的制备了Rab8多克隆抗体,为进一步研究Rab8参与病毒感染宿主细胞提供了重要的实验材料.     

Low incidence of antibody formation due to long-term interferon-α2c treatment of cancer patients

Summary In order to study the long-term immunogenicity of interferon-_2c (Berofor) in cancer patients, serum was collected starting in 1983 from study patients with various proliferative diseases who received interferon-_2c at different doses, according to different schedules, and via different routes. A total of 1992 samples were tested for the presence of anti-interferon-_2c antibodies. Due to long-term interferon-_2c treatment, 346 patients were eligible for induction of neutralizing anti-interferon antibodies over a treatment period of 252 months. Most patients were treated for longer than 6 months. Of the 346 patients, three patients (0.87%) exhibited measurable titers of neutralizing antibodies following therapy with interferon-_2c. One hundred and sixty-three patients suffered from non-Hodgkin lymphomas, leukemias, and preleukemias. One patient with chronic myeloid leukemia experienced antibody induction under therapy. The other 183 patients had solid tumors. Two of them reacted with antibody production. All titers were very low (1:12, 1:8, and 1:64). Compared with figures reported for other interferon- preparations, the propensity of interferon-_2c to induce neutralizing antibodies seems to be very low. This property might be related to arginines occurring as critical residues in positions 23 and 34 of the interferon-_2c molecule.Abbreviations ANB antiviral neutralization bioassay - CE competitive sandwich ELISA - EBI Ernst Boehringer Institut - IFN interferon     

CD1d-restricted NKT cells contribute to malarial splenomegaly and enhance parasite-specific antibody responses

CD1d-restricted NKT cells are a novel T cell lineage with unusual features. They co-express some NK cell receptors and recognize glycolipid antigens through an invariant T cell receptor (TCR) in the context of CD1d molecules. Upon activation through the TCR, NKT cells produce large amounts of IFN-gamma and IL-4. It has been proposed that rapid cytokine output by activated NKT cells may induce bystander activation of other lymphoid lineages. The impact of CD1d-restricted NKT cell activation in the induction of B cell-mediated immune responses to infection is still unclear. We show here that CD1-restricted NKT cells contribute to malarial splenomegaly associated with expansion of the splenic B cell pool and enhance parasite-specific antibody formation in response to Plasmodium berghei infection. The increased B cell-mediated response correlates with the ability of NKT cells to promote Th2 immune responses. Additionally, antibody responses against the glycosylphosphatidylinositol (GPI)-anchored protein merozoite surface protein 1 (MSP-1) were found to be significantly lower in CD1(-/-) mice compared to wild-type animals. P. berghei-infected MHC class II (MHCII)(-/-) mice also generated antibodies against MSP-1, suggesting that antibody production against GPI-anchored antigens in response to malaria infection can arise from both MHCII-dependent and independent pathways.     

Graves病患者TRAb与抗TSHAb抗体关系的初步研究

根据自身免疫性甲状腺疾病发病机制的独特型－抗独特型免疫免疫学说，用兔抗人ＴＳＨＡｂ检测ＴＳＨ抗独特型抗体（ＴＳＨＡｂ２）。以正常人为对照，以其结合率＾－ｘ＋２ｓ为正常值上限，大于此值为阳性。６０例ＴＲＡｂ阳性病人，６５％病人ＴＳＨＡｂ２阳性，而４０例ＴＲＡｂ阳性病人中，只有５％病人ＴＳＨＡｂ２阳性。两组差异显著（Ｐ〈０．０５）。ＴＲＡｂ和ＴＳＨＡｂ２呈正相关（ｒ＝０．６４５，Ｐ〈０．０１）。同时用     

Testing human sera for antibodies against avian influenza viruses: Horse RBC hemagglutination inhibition vs. microneutralization assays

BACKGROUND: The hemagglutination inhibition (HI) assay is a frequently used method to screen human sera for antibodies against influenza A viruses. Because HI has relatively poor sensitivity in detecting antibodies against avian influenza A strains, a more complicated microneutralization (MN) assay is often preferred. Recent research suggests that the sensitivity of the HI assay can be improved by switching from the traditionally used turkey, guinea pig, human, or chicken RBCs to horse RBCs. OBJECTIVE: To evaluate the performance of the horse RBC HI when screening for human antibodies against avian influenza types H3, H4, H5, H6, H7, H9, H11, and H12. STUDY DESIGN: We evaluated the reproducibility of horse RBC HI and its agreement with MN results using sera from people exposed or not exposed to wild and domestic birds. RESULTS: The horse RBC HI assay had high reliability (90%-100%) and good agreement with MN assay results (52%-100%). CONCLUSION: The horse RBC HI assay is reliable, less expensive, less complex, and faster than the MN assay. While MN will likely remain the gold standard serologic assay for avian viruses, the horse RBC HI assay may be very useful as a screening assay in large-scale epidemiologic studies.     

Efficacy and safety of anti-CD45–saporin as conditioning agent for RAG deficiency

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广东省人群中人嗜T细胞病毒Ⅰ型感染的血清流行病学调查及其与人类疾病的关系

收集广东省各类人群血清标本２２２４份，用间接免疫荧光法检测人类嗜Ｔ细胞病毒Ⅰ型（ＨＴＬＶ－１）抗体，结果：ＨＴＬＶ－１抗体阳性３５份，总阳性率为１．５７％；其中健康人群血清１８１０份，抗体阳性２３份，阳性率为１２７％；献血员血清２４８份，抗体阳性１份，阳性率０４０％；白血病患者血清１０９份，阳性８份，阳性率７３４％，与健康人群比较，有非常显著性差异（Ｐ＜０００５）；神经系统疾病患者血清５７份，阳性３份，阳性率５２６％。     

Humoral immunity to immunodominant epitopes of Hepatitis C virus in individuals infected with genotypes 1a or 1b

Cellular immunity against multiple Hepatitis C virus (HCV) proteins is observed in patients acutely infected with HCV most of whom later resolve infection. We wished to assess humoral immunity in patients infected with HCV 1a or 1b genotypes in relation to viral load using plasma samples from HCV-infected individuals and a panel of peptides representing immunodominant epitopes of HCV structural and nonstructural proteins. Plasma from HCV 1a- and 1b-infected patients, respectively, were divided into two groups: patients with low viral load (<==100,000 RNA copies/ml) and patients with high viral load (>/=10,000,000 RNA copies/ml). The antigens were peptides representing epitopes from immunodominant regions of HCV core, E2, NS3, and NS4 proteins, as well as the hypervariable (HVR) epitopes in E2 from genotypes 1a and 1b. Individuals infected with HCV 1a evoked a stronger immune response to many immunodominant epitopes of HCV relative to individuals infected with HCV 1b. Moreover, among individuals infected with HCV 1a, those with low viral loads mounted significantly greater responses against these epitopes than did individuals with high viral loads. Our observations demonstrate that quantitatively different antibody responses are elicited against HCV depending on the genotype of infecting virus, and suggest that humoral immunity directed against multiple immunodominant epitopes in HCV 1a-infected individuals may help lower viral load in vivo.     

一起流行性脑脊髓膜炎疫情病例密切接触者及周围人群的脑膜炎奈瑟菌菌属类型及抗体检出情况调查

目的 对流行性脑脊髓膜炎患者的密切接触者及周围人群进行脑膜炎奈瑟菌菌属类型及抗体检测调查,为流脑防控工作提供科学依据。方法 采集病例密切接触者和周围人群的血清和咽拭子进行带菌及抗体检测。结果 共采集流脑患者密切接触者30人和周围人群147人,其中密切接触者共3人检出脑膜炎奈瑟菌阳性,且均为C群;周围人群共19人检出脑膜炎奈瑟菌阳性,其中B群17人,W135群2人。在抗体检测中,其中周围人群的检出率高于密切接触者（χ2 = 7.885,P＜0.05）;密切接触者中Y群检出率高于周围人群（χ2 = 12.638,P＜0.05）。在疫苗接种与抗体检出中,密切接触者的A群流脑多糖疫苗、A + C脑膜炎球菌结合疫苗的接种率与周围人群比较均无统计学上差异（P＞0.05）,同时A群与A + C群抗体检测在统计学上也无差异（P＞0.05）。但在未全程接种的A + C群抗体检测中,未全程接种的周围人群抗体阳性率高于密切接触者（χ2 = 6.021,P＜0.05）。结论 本起疫情检测菌属以B群为主,抗体检出以为A群为主,且疫苗接种率越高,抗体阳性检出率越高。