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1.
重金属镉离子免疫抗原初步制备与鉴定   总被引：2，自引：0，他引：2  
选用螫合剂Isothiocyanobenzyl-EDTA（IEDTA）分别桥接载体蛋白KLH和BSA。络合重金属镉离子，初步制备免疫抗原和检测抗原，免疫Balb／C小鼠并制备抗血清；利用紫外分光光度法、三硝基苯磺酸法（TNBs）和测定抗体效价初步鉴定抗原。建立了重金属镉离子ELISA快速检测技术及单克隆抗体高效特异的免疫与检测抗原。抗原紫外吸收峰与载体蛋白紫外吸收峰有明显差异，2种抗原游离氨基酸含量在33％～40％之间，抗原蛋白含量均高于70％，血清效价在1：81920以上。结果提示，免疫抗原特异性较好。可用于单克隆抗体制备。  相似文献   

2.
合成、鉴定了马波沙星(MBF)人工抗原,为马波沙星单克隆抗体的制备及其免疫学检测方法的建立奠定基础。以牛血清白蛋白(BSA)、鸡卵清蛋白(OVA)为载体蛋白,采用碳二亚胺法分别合成马波沙星免疫抗原(MBF-BSA)和包被抗原(MBF-OVA),并使用紫外分光光度法、SDS-PAGE、ELISA方法鉴定人工抗原合成效果。初步鉴定结果显示,MBF-BSA与MBF-OVA均偶联成功;用免疫抗原MBF-BSA免疫小鼠,经ELISA方法检测,五免后血清中抗体效价可达1∶5.12×105,半数抑制率为90.20 ng/m L。研究表明,马波沙星人工抗原合成成功,其免疫抗原具有良好的免疫原性,免疫小鼠可获得高效价、高特异性多克隆抗体。  相似文献   

3.
旨在建立检测血清大豆抗原蛋白抗体的间接ELISA方法。经琼脂糖凝胶层析纯化大豆抗原蛋白,以不同剂量皮下注射免疫小鼠,采用方阵滴定法确定最佳抗原包被浓度及血清稀释度,并对其他条件进行优化,最终建立检测血清大豆抗原蛋白抗体的间接ELISA方法,利用该方法检测小鼠免疫后血清抗体水平。通过方阵滴定法确定11S蛋白最佳包被浓度为5.0μg/mL,血清稀释倍数为1∶800;7S蛋白抗原最佳包被浓度为2.5μg/mL,血清稀释倍数为1∶1 600;两者的批内、批间系数均小于10%,重复性较好,通过ELISA法确定11S和7S蛋白的最佳免疫次数为2次,免疫剂量为1 000μg/kg。结果表明本试验初步建立大豆抗原蛋白抗体检测间接ELISA方法,具有很强的特异性、敏感性和重复性,可用于大豆抗原蛋白过敏反应的临床检测。  相似文献   

4.
为检测磺胺甲恶唑(SMZ)的残留,用重氮化方法将SMZ偶联于载体蛋白BSA和OVA上,合成了免疫抗原BSA-SMZ和包被抗原OVA-SMZ。经紫外扫描、SDS-PAGE电泳鉴定后,免疫BALB/c小鼠,制备多抗血清;利用间接ELISA法测定多抗血清效价,竞争ELISA测定多抗血清的敏感性和特异性。结果表明,所合成的免疫抗原效果较好,6只免疫小鼠多抗血清的效价均大于1∶1.28×104,5号小鼠的多抗血清敏感性最高,半数抑制浓度为47.1ng/mL,与其他磺胺类药物无交叉反应,具备良好的特异性。试验成功合成了SMZ人工抗原,并制得了敏感性高、特异性好的鼠源多抗血清,为SMZ单克隆抗体制备及其免疫学快速检测方法的建立奠定了基础。  相似文献   

5.
为探讨猪繁殖与呼吸综合征病毒(PRRSV)GP5和M蛋白滴鼻免疫小鼠后产生的特异性抗体的中和活性,研究以原核表达的重组蛋白GP5和M为抗原分别与霍乱毒素B亚基(CTB)佐剂按10∶1的比例混合制备成CTB黏膜佐剂疫苗,滴鼻免疫小鼠,于首次免疫后0,7,14,21,28,35,42 d收集唾液和血清样品,利用间接ELISA方法分别检测免疫小鼠唾液中特异性抗体IgA,结果均于28 d时S/N值达到最高,ELISA效价均为1∶2;血清中特异性抗体IgG分别于21,28 d时S/N值达到最高,ELISA效价均为1∶800。通过本实验室建立的基于PAM细胞中和试验方法分别检测唾液中特异性抗体IgA和血清中特异性抗体IgG中和滴度均1∶2,结果表明PRRSV GP5和M蛋白滴鼻免疫小鼠后产生的特异性抗体未达到免疫保护作用的中和抗体水平。  相似文献   

6.
为评估禽致病性大肠杆菌(APEC)溶血素HlyE蛋白的免疫原性,本研究对APEC溶血素HlyE蛋白进行原核表达和纯化,并对表达的重组蛋白进行SDS-PAGE和western blot分析,将纯化蛋白利用透析袋在4℃透析后,利用血琼脂平板对其溶血活性进行检测。SDS-PAGE和western blot结果显示,表达并纯化到分子量约为36 ku的重组HlyE蛋白(rHlyE),经ND-2000超微量核酸蛋白测定仪测定纯化后蛋白浓度为0.65 mg/mL;溶血活性检测结果显示,rHlyE具有溶血活性。以透析后的rHlyE作为抗原,按照50μg/只的剂量免疫小鼠,对照组于相同时间点注射等量PBS,共免疫3次间隔14 d,并于首免后不同时间采血,采用间接ELISA方法检测两组小鼠血清特异性抗体水平,并于三免后18 d以2 LD50的APEC菌液攻毒小鼠,观察7 d内小鼠的死亡情况;于首免后28 d剖杀各组小鼠取其脾脏制备脾淋巴细胞,采用流式细胞术分别检测CD3+、CD4+、CD8+T淋巴细胞亚型比率,对rHl...  相似文献   

7.
旨在构建表达猪圆环病毒2型（PCV2）cap蛋白的重组罗伊氏乳酸杆菌（Lactobacillus reuteri,L.reuteri）,并评价其在小鼠体内诱导的免疫应答效果。利用PCR扩增实验室分离保存的PCV2b型毒株的cap蛋白基因,以猪源L.reuteri为宿主菌,构建表达cap蛋白的重组菌株pPG-T7 g10-PPT-cap/L.reuteri,通过口服免疫BALB/c小鼠。采用间接ELISA方法测定免疫后小鼠血清中抗原特异性IgG抗体水平,粪便、鼻腔洗液、生殖道洗液、肠黏液中抗原特异性sIgA抗体水平,小鼠血清中各细胞因子水平;MTT法检测小鼠脾淋巴细胞增殖水平;流式细胞技术检测小鼠脾淋巴细胞中CD4+T细胞、CD8+T细胞的水平;荧光定量PCR检测免疫后攻毒的小鼠体内器官的病毒载量。结果显示,口服免疫重组乳酸菌组小鼠血清IgG抗体水平显著高于对照组（P<0.01）;小鼠粪便、鼻腔洗液、生殖道洗液、肠黏液中sIgA抗体水平显著高于对照组（P<0.01）;小鼠血清中细胞因子水平和对照组相比,IFN-γ、IL-2、IL-4、IL-12水平升高,IL-10水平降低,IFN-α无显著变化;体外孵育PCV2和小鼠脾淋巴细胞结果表明,重组乳酸菌组小鼠脾淋巴细胞增殖刺激指数显著高于对照组（P<0.01）;流式细胞技术检测结果显示,口服免疫重组乳酸菌组小鼠脾细胞中CD4+T细胞、CD8+T细胞含量高于对照组;荧光定量PCR结果显示,相比于对照组,口服免疫重组乳酸菌组小鼠体内的病毒载量明显低于对照组。综上所述,本研究成功构建了表达PCV2 cap蛋白的重组罗伊氏乳酸杆菌,经口服途径免疫动物,构建的重组乳酸杆菌能够刺激小鼠产生体液免疫和细胞免疫应答,且具有一定的免疫保护效果。  相似文献   

8.
为筛选出制备猫瘟热亚单位疫苗的最佳佐剂类型与首选抗原片段,本试验对虎源FPV-HLJ株VP2全长基因及其截短基因片段PAB进行原核表达,切胶法纯化的表达蛋白经Western blot分析后,分别与氢氧化铝胶佐剂及弗氏佐剂混合,免疫BALB/c小鼠,间接ELISA方法检测小鼠体液免疫水平,初步评价各疫苗的免疫效果。结果表明:VP2、PAB融合蛋白主要以包涵体形式表达,切胶法获得的高纯度表达蛋白均能与鼠抗虎源FPV阳性血清发生特异性反应。纯化蛋白各佐剂免疫组免疫小鼠后均引起较强的特异性抗体IgG反应,其中PAB蛋白各免疫佐剂组抗体水平明显高于VP2蛋白相应免疫佐剂组,且PAB蛋白+氢氧化铝胶组与PAB蛋白+弗氏佐剂组抗体水平无显著差异(P0.05),但与未加佐剂组差异显著(P0.01)。研究证实,PAB蛋白具有良好的免疫原性,可与氢氧化铝胶佐剂协同用于FPV亚单位疫苗的制备。  相似文献   

9.
为分析猪乙型脑炎病毒(JEV)E蛋白Ⅲ结构域的抗原性,本研究克隆了JEV疫苗株SA14-14-2的E蛋白结构域Ⅲ,并通过pET-28a载体进行融合表达和纯化。用纯化后蛋白作为免疫原,免疫8周龄BALB/c小鼠,通过SDS-PAGE、Western blotting、间接ELISA及间接免疫荧光方法(IFA)检测小鼠及猪抗体滴度,验证E蛋白结构域Ⅲ的抗原性。SDS-PAGE结果表明融合蛋白以包涵体形式表达;Western blotting、间接ELISA检测结果表明表达产物具有良好的抗原性;纯化的蛋白免疫BALB/c小鼠ELISA方法检测特异性抗体滴度可达1×105;猪JEV阳性血清ELISA抗体滴度可达5.1×104;IFA结果表明JEV E Ⅲ蛋白产生的抗血清能很好的识别乙型脑炎病毒抗原。以上结果表明,表达、纯化的重组JEV E Ⅲ蛋白具有良好的抗原性。本试验结果为建立以E蛋白结构域为抗原的诊断方法提供了重要依据。  相似文献   

10.
将鸭疫里默氏杆菌的pfs基因进行原核表达,重组蛋白经纯化后作为抗原免疫BALB/c小鼠。经过3次免疫后,取免疫小鼠脾细胞与SP2/0骨髓瘤细胞进行细胞融合,利用间接ELISA方法筛选阳性杂交瘤细胞株。通过间接ELISA法测定腹水效价、Western blot法检测其免疫反应性,并鉴定抗体的亚型。重组蛋白SDS-PAGE检测结果验证得到26 k Da Pfs蛋白,免疫小鼠后最终获得1株阳性杂交瘤细胞株,命名为2E2E6,为Ig G1亚类,间接ELISA法检测腹水效价为1:64 000。Western blot结果表明制备的单克隆抗体具有良好的免疫反应性。本研究成功制备了Pfs的单克隆抗体,为进一步研究Pfs在鸭疫里默氏杆菌中的作用提供了参考。  相似文献   

11.
1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks.  相似文献   

12.
Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large.  相似文献   

13.
Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses.  相似文献   

14.
The epidemiology of H. placei and of other gastrointestinal nematodes in yearling dairy cattle was examined on two farms in Kiambu District, central Kenya during each of 13 one-month periods from April 1993 to April 1994. On each farm, 32 newly weaned dairy calves were given a single dose of albendazole and then placed on experimental pastures. Twelve of the animals were designated for bi-monthly slaughter (n = 2) and analysis of worm population characteristics and 20 were designated for blood and faecal collection and for weighing. Two parasite-free tracer calves were grazed alongside the weaner calves each month throughout the study period and were also slaughtered for analysis of worm populations. Faecal egg counts, haematological and serum pepsinogen determinations, herbage larval counts, and animal live weight changes were recorded monthly. The study revealed that Haemonchus placei, Trichostrongylus axei, Cooperia spp. and Oesophagostomum radiatum were responsible for parasitic gastroenteritis and that H. placei was the predominant nematode present in the young cattle on both farms. Faecal egg counts from resident cattle and necropsy worm counts revealed that pasture larval levels were directly related to the amount of rainfall. The total worm burdens in the animals were highest during the rainy season (March–June and October–December) and lowest during the dry seasons (July–September and January–February). The very low recovery of immature larvae of H. placei from the tracer calves indicated that arrested development is not a feature of the life cycle of this parasite in central Kenya. The maintenance of the parasite population depended on continuous cycling of infection between the host and the pasture. The agroclimatic conditions of the study area were such that, in general, favourable weather conditions for the development and survival of the free-living stages of gastrointestinal nematodes existed all year round.  相似文献   

15.
The occurrence of ectoparasites in sheep flocks is frequently reported but seldom quantified. Sheep production used to be a predominantly family activity in the state of Sa~o Paulo (Brazil), but it began to become a commercial activity in the past decade. Thus, information about the ectoparasites existing in sheep flocks has become necessary. The present data were obtained by means of questionnaires sent to all sheep breeders belonging to the `Associaça~o Paulista de Criadores de Ovinos' (ASPACO; Sa~o Paulo State Association of Sheep Breeders). Response reliability was tested by means of random visits paid to 10.6% of the respondents. Most of the properties (89.5%) reported the presence of one or more ectoparasites. Screw-worm (Cochliomyia hominivorax) was the most frequent ectoparasite (72.5%), followed by bot fly larvae (Dermatobia hominis, 45.0%), ticks (Amblyomma cajennense) and Boophilus microplus, 31.3%) and finally lice (Damalinia ovis, 13.8%). Combined infestations also occurred, the most common one being screw-worm with bot fly larvae (36.0%) followed by bot fly larvae with ticks (13.9%), screw-worm with ticks (9.3%), bot fly larvae with lice (6.9%), and ticks with lice (5.0%). The most common triple combination was screw-worm, bot fly larvae and ticks (12.8%). Breeds raised for meat or wool were attacked by bot fly larvae and ticks more often than other breeds. Lice were only absent from animals of indigenous breeds. The relationships among these ectoparasites are discussed in terms of sheep breeds, flock size, seasonality and the ectoparasitic combinations on the host.  相似文献   

16.
Comparison of different tests to diagnose feline infectious peritonitis   总被引：1，自引：0，他引：1  
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17.
An experiment was conducted to study disappearance of C14 to C18 fatty acids, lag times and biohydrogenation (BH) rates of C18 fatty acids of ground soya bean and canola seeds in situ. Three ruminally fistulated Dallagh sheep were used to determine ruminal BH of unsaturated fatty acids (UFAs). Differences in the disappearance of fatty acids through the bags and lag times were observed between the oilseeds. We saw that the longer the incubation time of the oilseeds in the rumen, the lower the content of C18:2 and C18:3. Significantly higher lag times for both C18:2 and C18:3 were observed in ground canola compared to ground soya bean. BH rates of C18:2 and C18:3 fatty acids in soya bean were three times higher than those of canola. These results suggest that the fatty acid profile of fat source can affect the BH of UFAs by rumen micro‐organisms. So that UFAs of canola had higher ability to escape from ruminal BH. It seems that fatty acid profile of ruminant products is more affected by canola seed compared to soya bean seed.  相似文献   

18.
Serum biochemical values and the wet weight to dry weight ratios of tissues were determined in yaks in Shandan county of Gansu province. The liver, kidney, heart and muscle contents of seven elements in yaks were also analysed. Most serum biochemical values were similar to those of cattle, camels and sheep, but the calcium concentration was considerably above the normal range for other ruminants. The liver contained the highest concentrations of copper, manganese and cobalt and the kidney of selenium, iron and calcium.Abbreviations Alb albumin - ALT alanine aminotransferase - AST aspartate aminotransferase - BUN blood urea nitrogen - Chol cholesterol - Glob globulin - -GT -glutamyl transpeptidase - IP inorganic phosphorus - TP total protein  相似文献   

19.
正We are pleased to publish the second special issue on avian brood parasitism and to be responsible guest editors for the two special issues of Chinese Birds (Vol. 3, No. 4, 2012 and Vol. 4, No. 1, 2013), entitled "Avian Brood Parasitism - A Growing Research Area in Behavioral Ecology". The first issue was published in December 2012. The goal of the two special issues is to publish accumulated knowledge and some of the recent developments in  相似文献   

20.
Tropical Animal Health and Production -  相似文献   

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