江苏常州地区禽白血病血清学调查研究

为了解江苏常州地区肉鸡禽白血病病毒(ALV)感染情况,本研究采集了该地区2019年7-12月、2020年1-4月肉鸡血清样本1257份,通过ELISA试剂盒检测ALV-A/B、ALV-J、抗原p27阳性率.结果显示:在接受调查的两个地区均存在ALV感染及混合感染,且ALV-A/B感染率(13.13％)均高于ALV-J(...     

两种洗涤方法对马传染琼扩抗原生产试验

用两种不同洗涤方法生产马传染琼扩抗原。试验结果表明,用硫酸重铬酸钾清洗液洗刷的组织培养克氏瓶,细胞生长旺介线清楚,立体感强,接种马传染性贫血病毒后。细胞抗原产量高于用清洁剂刷的克氏瓶培养的细胞抗原的２￣３倍。     

猪旋毛虫病疫苗后海穴免疫研究

本项目对猪旋毛虫病成虫可溶性抗原疫苗经后海穴免疫注射的效果进行了研究。大鼠经口感染旋毛虫肌幼虫后３或７ｄ剖杀，收集成虫。经超声粉碎、高速离心制备成虫可溶性抗原。将抗原与等体积ＦＣＡ乳化，按０．２５ｍｇ／头及０．５０ｍｇ／头的抗原量分别进行后海穴注射（ＡＰ）及腹腔注射（ＩＰ），免疫猪只，使之经受旋毛虫的实验室攻击感染及自然感染。结果表明，３日龄及７日龄成虫可溶性抗原的免疫原性基本一致。采用后海穴注射疫苗具有减少抗原用量、增强免疫效果的作用。免疫后猪血清抗体滴度增加，呈暂时的细胞免疫抑制现象。后海穴注射疫苗猪群保护率达１００％，增加一倍抗原量经腹腔注射的猪群保护率为７５．２６％。     

酸性红73人工抗原的合成与鉴定

为进一步制备酸性红73新型人工抗原,试验采用N,N-羰基二咪唑(CDI)法合成酸性红73的免疫原和包被原,经紫外扫描和十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)鉴定偶联成功,酸性红73与牛血清白蛋白(BSA)、卵清蛋白(OA)的偶联比分别为9∶1和5∶1。免疫后所得兔源多克隆抗体,采取双向琼脂扩散实验和方阵滴定法确定包被抗原和抗体的最适工作浓度分别为1∶4000、1∶8000。     

Cutaneous T‐cell lymphoma – Sézary syndrome in a Boxer

A 7‐year‐old male Boxer with a 3.5‐year history of atopy and food hypersensitivity was presented with multiple poorly circumscribed nodules and maculae of the skin and tongue, and jaundiced mucosal membranes. Cytologic and histopathologic examination of the skin lesions revealed cutaneous epitheliotropic lymphoma. Cells were CD3⁺ and CD8⁺ in flow cytometry. The CBC showed a moderate leukocytosis with 16% atypical lymphocytes with irregularly cleaved nuclei. Flow cytometric phenotyping of peripheral blood showed an elevated proportion of the CD8⁺ T‐lymphocyte subpopulation, indicating a malignant population of T‐cell origin, and the electropherogram of the PCR antigen receptor rearrangement produced a monoclonal peak for TCRγ. Liver enzyme activities were markedly increased and abdominal ultrasound examination showed increased echogenicity of the liver and enlarged abdominal lymph nodes. Fine‐needle aspirates of the liver confirmed infiltration with lymphocytes exhibiting the same morphology as the cells detected in skin and peripheral blood. Treatment was induced with L‐asparaginase, lomustine, and prednisone. Partial clinical remission of the skin and tongue lesions was achieved within 10 days, and hematologic abnormalities resolved. Despite further treatment with L‐asparaginase and lomustine, the dog relapsed within one month and was euthanized. Presence of malignant lymphocytes in skin, peripheral blood, and liver indicate a rare variant of leukemic cutaneous T‐cell lymphoma, equivalent of Sézary syndrome in a dog. This case report describes the use of flow cytometry as a complementary tool for lymphocyte characterization of skin lesions for the first time.     

夹心ELISA检测鹿粘膜病病毒的研究

建立了检测鹿粘膜病毒 (MDV)抗原的双抗体夹心ELISA。试验方法的最佳工作条件 :抗体包被量为 1 0 0 μg/孔 ,酶标抗体的稀释度为 1∶40 0倍。对吉林省某地鹿场的鹿粪样的检查结果表明 ,该鹿场的MDV阳性率为 32 %。     

Humoral and cellular immune responses to Fasciola gigantica experimental infection in buffaloes

Humoral and cellular immune responses to Fasciola gigantica experimental infection in buffaloes were studied. The results showed that 33.4+/-9.1% of the infection dose was recovered as adult flukes from infected animals at necropsy. Significant differences of weight gain between infected and non-infected buffaloes was observed at 4 MPI (months post-infection). Anti F. gigantica excretory-secretory products (FgESP)-IgG levels increased significantly from 3 WPI (weeks post-infection) and displayed a peak at 13 WPI. Western blot indicated that in FgESP six major bands of 11.5, 19.0, 23.4, 29.8, 47.5 and 53.2kDa were recognized by F. gigantica-infected buffaloes sera after 0 WPI. Eosinophil numbers increased significantly from 3 WPI in F. gigantica-infected buffaloes and displayed a peak at 8 WPI. Peripheral blood mononuclear cells (PBMC) proliferation induced by FgESP increased from 2 WPI with a peak at 5 WPI. IFNgamma secretion by FgESP-stimulated PBMC appeared early from 1 WPI with three peaks at 2, 5 and 8 WPI, respectively. IL-10 production was observed from 2 WPI with two peaks at 4 and 9 WPI, respectively. Our results suggested that buffaloes were highly susceptible to F. gigantica infection, and this susceptibility could be associated with the late and weak cellular immune response in the early phase of infection and the Th0-like response throughout the infection.     

Analysis of neutral glycosphingolipids from Trypanosoma brucei

Neutral glycosphingolipids (GSLs) were isolated from Trypanosoma brucei and analyzed by thin-layer chromatography (TLC), TLC/secondary ion mass spectrometry (TLC/SIMS), and liposome immune lysis assay (LILA). Three species of neutral GSLs, designated as N-1, -2, and -3 were separated on TLC. N-1 GSL migrated very close to glucosylceramide (GlcCer) and N-2 GSL showed the same mobility as lactosylceramide (LacCer). On the other hand, the mobility of N-3 GSL on the TLC plate was slower than globotetraosylceramide (Gb4). In order to characterize the molecular species of neutral GSLs from T. brucei, N-1, -2 and -3 GSLs were analyzed by TLC/SIMS. The TLC/SIMS analysis of N-1 of the parasites revealed a series of (M–H)⁻ ions from m/z 698 to 825 representing the molecular mass range of ceramide monohexoside (CMH) (GlcCer or galactosylceramide). On the other hand, the TLC/SIMS spectra of N-2 GSL revealed a series of (M–H)⁻ ions from m/z 944–987 indicating the molecular mass range of LacCer. In the TLC/SIMS analysis of N-3 GSL, however, the characteristic molecular ions that can elucidate the structure of N-3 GSL were not obtained. In order to confirm the results obtained from TLC/SIMS, N-1, -2, and -3, GSLs were tested by LILA with specific antibodies against GlcCer, LacCer, and Gb4, respectively. N-1 GSL had reactivity to anti-GlcCer antibody and N-2 GSL reacted with the antibody against LacCer. However, N-3 GSL was not recognized by anti-Gb4 antibody. Using anti-GlcCer and anti-LacCer antibodies, furthermore, we studied the expression of GlcCer and LacCer in T. brucei parasites. Both GlcCer and LacCer were detected on the cell surface of T. brucei.     

猪圆环病毒2型Cap蛋白ELISA检测方法的建立及初步应用

将杆状病毒表达系统表达并经梯度离心纯化的PCV2Cap蛋白作为标准品,利用双抗夹心法建立了针对猪圆环病毒2型Cap蛋白的ELISA检测方法,并应用于圆环病毒2型基因工程疫苗的质控。结果表明,多抗最适包被浓度为1μg/mL,最佳封闭液为1％BSA,最佳单抗反应浓度为2μg／mL,反应时间60min,最佳二抗使用稀释度1：40000,反应时间60min。该方法与St9细胞、BSA和其他猪病病毒抗原之间无交叉反应,最低检测抗原量为5ng。