抗胱抑素C鸡卵黄IgY抗体的制备及鉴定

目的:制备高效价、高特异性的抗人胱抑素 C 鸡卵黄 IgY 抗体,并对其基本特性进行分析和鉴定.方法:以人胱抑素 C 为抗免疫产蛋的罗曼鸡,采用水稀释-盐析法提取及纯化 IgY 抗体,采用蛋白质定量、SDS-PAGE、West?ern 印迹和 ELISA 法对 IgY 抗体进行分析和鉴定.结果:免疫后14 d 即可从鸡冠血中检测出抗胱抑素 C 的特异性抗体,抗体效价在28 d 达最高峰(1∶32000),并可维持2个月以上;收集高效价时的免疫鸡蛋,制备鸡卵黄抗体 IgY;还性 SDS-PAGE 显示抗体 IgY 为相对分子质量分别为65×103和21×103的2条带,抗体纯度可达92%,得率为每个鸡蛋36.5 mg,抗体检出敏感度为15.63 ng/mL;Western 印迹证明该抗体具有高度特异性.结论:制备了抗胱抑素 C 的高效价、高特异性 IgY 抗体.     

三种鸡形目雉科禽类卵黄抗体的纯化及二抗的制备

目的 纯化三种鸡形目雉科的禽类孔雀、鹌鹑、贵妃鸡的卵黄抗体IgY,并且免疫家兔制备抗血清。方法 采用了水稀释法,HiTrap IgYPurification HP免疫亲和层析法和硫酸铵沉淀法纯化IgY。免疫家兔制备抗血清,免疫双扩散法测定效价。Protein-A亲和纯化兔抗IgY血清IgG。结果 经亲和纯化和盐析纯化,得到了孔雀、鹌鹑、贵妃鸡的卵黄抗体IgY,经SDS-PAGE检测为电泳纯,孔雀、鹌鹑、贵妃鸡的卵黄抗体IgY的相对分子质量约为180×10^3。免疫后经Protein-A亲和纯化后获得了兔抗IgY的IgG。结论 证实了孔雀、鹌鹑、贵妃鸡的卵黄抗体IgY的存在及其特性。雉科鸡形目禽类卵黄抗体的纯化方法 相似,可以推广到鸡形目其它禽类的卵黄抗体的纯化中,获得的抗血清可以进一步进行标记和今后抗原的检测。     

鸡卵黄抗体IgY的分离纯化及鉴定

采用水溶稀释法结合硫酸钠二次盐析沉淀法分离纯化鸡卵黄中蛋白IgY,实验中比较了不同pH值的水溶稀释液对卵黄除脂效果的影响;并采用SDS-PAGE及western blotting对提取产物进行鉴定。结果显示,pH值5.2水溶稀释液除脂效果最好,IgY得率最高。实验优化了鸡卵黄抗体IgY分离纯化技术,得到的IgY产量高、纯度高,特异性强;此外,水溶稀释法制备IgY具有利用小体积样品获得大量蛋白及纯化效率高的优点。     

抗MRSA-PBP2a鸡卵黄抗体的制备及乳胶凝集检测法的建立

制备抗耐甲氧西林金黄色葡萄球菌青霉素结合蛋白2a( MRSA- PBP2a)抗原的鸡卵黄免疫球蛋白(IgY),建立检测MRSA的乳胶凝集方法.采用体外诱导的方法制备PBP2a蛋白,胸部肌肉多点注射方式免疫6只海蓝蛋鸡,水稀释法提取IgY,BCA法测定蛋白含量,Western blotting进行特异性分析,用提取的IgY抗体致敏聚苯乙烯乳胶,建立检测PBP2a的乳胶凝集方法.成功诱导并制备获得纯化的PBP2a蛋白,首次免疫后1月每枚鸡蛋提纯后可获得约48 mg IgY抗体,Western blotting结果显示IgY抗体能有效识别纯化的PBP2a蛋白;成功建立检测PBP2a的乳胶凝集法,敏感性达1 mg/L.抗MRSA- PBP2a鸡卵黄抗体具有较高的敏感性和特异性,基于其建立的乳胶凝集检测方法具有较好的灵敏性.     

抗金黄色葡萄球菌IgY的酶解稳定性及活性研究

目的:考察抗金黄色葡萄球菌特异性IgY的酶解稳定性和酶解产物的活性。方法:以灭活的金黄色葡萄球菌免疫产蛋母鸡,抗体经水稀释及盐析分离纯化。抗体在不同条件下经胃蛋白酶或胰蛋白酶消化。抗体及酶解产物的特异性和活性分别用ELISA法和凝集法检测,酶解产物用SDS-PAGE和Western-blotting鉴定。结果:免疫产生的抗体具有特异性,能与金黄色葡萄球菌凝集而抑制其生长。分离纯化后抗体纯度与标准IgY相近。IgY在pH<4时完全酶解;pH等于4时部分酶解生成Fab片断,具有特异性和凝集活性;pH>4时,抗体稳定,不发生酶解。结论:抗金黄色葡萄球菌特异性IgY及其酶解生成的Fab片断,具有特异性和抑菌活性,有望代替抗生素用于细菌感染性疾病的治疗。     

抗HIV-1 p15(gag)IgY抗体的制备及活性检测

目的:制备具有高效价强特异性的抗HIV-1 p15(gag)鸡卵黄抗体(IgY),纯化并分析其免疫学活性。方法:用纯化的HIV-1 p15(gag)蛋白抗原免疫蛋鸡,用水稀释法对IgY抗体进行粗提取并结合乙醇沉淀和氯化钠盐析法纯化抗体,再通过SDS-PAGE、Western blot、酶联免疫吸附实验(ELISA)检测抗体的纯度、特异性及效价。结果:表达纯化的HIV-1 p15(gag)-GST融合蛋白分子量为45kDa,用于抗体检测的抗原。用纯化的His-P15蛋白作为免疫原免疫蛋鸡后,获得的卵黄抗体重链、轻链分子量分别为65kDa和25kDa。8倍体积水稀释卵黄,pH值5.1,20%冰乙醇及0.028mol/L盐溶液分离纯化,纯度可达96℅,每毫升卵黄液可得到的卵黄抗体为9.8mg。终浓度为18%～25%的冰乙醇纯化的抗体浓度高且稳定,同时具有较强的特异性和较高的效价。结论:用HIV-1p15(gag)蛋白免疫蛋鸡,可以获得高效价的特异性抗体IgY,为IgY抗体在HIV-1p15蛋白的研究奠定了实验基础。     

抗肺炎支原体卵黄抗体的制备及其免疫特性

目的制备抗肺炎支原体卵黄抗体,并研究其免疫特异性。方法以超声粉碎法制备肺炎支原体抗原;以ELISA法测定卵黄抗体的效价及免疫特异性;以水稀释法联合疏水层析的方法分离纯化卵黄抗体;应用SDS-PAGE法测定分子量及鉴定抗体纯度;改良Lowry法测定蛋白含量。结果低、高剂量组均诱导母鸡产生有效免疫应答,高剂量组免疫效价高于低剂量组。高剂量组于初免疫后约50d抗体效价达高峰,持续约2个月;而低剂量组在初免疫后约60d抗体效价达高峰,持续约1个月。之后效价逐渐下降,在免疫约120d,高剂量组由13log2下降到10log2;而低剂量组则由11log2下降到7log2。以水稀释法联合疏水层析法制备了电泳纯抗肺炎支原体IgY,分子量约178KD,平均每1ml卵黄液可获得较纯抗体6.4mg。制备的IgY与肺炎支原体具有较高特异性,与解脲支原体和人型支原体无明显交叉反应,与生殖支原体有轻度的交叉反应。结论本研究初步制备了抗肺炎支原体卵黄抗体,为肺炎支原体的防治与检测提供新的途径。     

抗绿脓杆菌鸡卵黄免疫球蛋白的制备和实验

取多价绿脓杆菌（Psetltz‘,lll‘,lltlm对川组＿,PA刚成抗原,免疫美国特种母鸡,并从其所产卵的蛋黄中分离制备抗绿脓杆菌鸡卵黄免疫球蛋白。首先采用水稀释法分离得到鸡卵黄免疫球蛋白（imrnUndeulinofyolk;IgY）组提物,进而采用离子交换层析和凝胶过滤层析得到电泳纯IgY此IgY具有抗PA抗体的特异性,fi．免疫应答迅速（免疫2周后送开始产生抗体）,持久性长（达11个月）。免疫母鸡的成功率为100％。取SD大鼠进行烧伤肠源性感染防治实验。大鼠随机分为3组（正常对照组、烧伤对照组及抗一PAlgY预防组）,烧伤后24h－c48h测户］…     

基因专一性鸡卵黄抗体(IgY)的研究及应用

用抗原免疫鸡,从鸡卵黄中获取特异多克隆IgY抗体,是一条高产量、低成本的简便快速途径。IgY与哺乳动物抗体IgG相比具有许多突出的优点,使IgY在现代免疫学中已得到广泛应用。采用基因免疫方法制备的基因专一性IgY抗体,在免疫分析、寻找药靶和生物标记物、制备新抗体等方面,必有进一步的应用。     

抗甲3型流感病毒卵黄抗体的研制

制备抗H3N2型流感病毒特异性鸡卵黄免疫球蛋白（IgY),防治同型流感病毒引起的流感,制备H3N2型流感病毒,通过两种途径免疫母鸡,以水稀释-硫酸铵沉淀及离子交换层析法提纯,并进行理化性质分析和动物效力试验。两种途径免疫均可使母鸡产生特异性IgY,其中以静脉为主的混合免疫法效果较好,提纯后纯度可达90%以上,通过被动免疫可使小鼠对同型流感病毒的攻击产生保护作用。结果表明,已成功地制备出高效价的H3N2型流感病毒特异性IgY。     

Eliciting antigen-specific egg-yolk IgY with naked DNA

Immunization with naked DNA was used to elicit chicken egg yolk antibodies (IgY). Layer hens were inoculated with plasmid DNA encoding the enhanced green fluorescent protein, the fusion protein of Newcastle disease virus, and VP2 of African horse sickness virus. IgY was extracted from egg yolks by polyethylene glycol precipitation. Specific antibodies were present in the yolks of eggs from hens immunized with each of the three different plasmids. This approach to raising polyclonal antibodies obviates the need to produce and purify large quantities of proteins for immunization and can potentially yield large amounts of diagnostically or therapeutically useful reagents.     

抗中华眼镜蛇毒鸡卵黄抗体的制备及其效价测定

目的探索免疫鸡制备高效价抗眼镜蛇毒抗体的新方法。方法用中华眼镜蛇原毒作抗原免疫22周龄的莱航母鸡,水溶法粗提抗体,DEAE Sepharos FF柱纯化,切向流超滤膜脱盐及浓缩,免疫电泳及双向免疫扩散法进行鉴定及效价测定,采用BCATMProte in Assay K it测定蛋白含量。结果鸡卵黄经水溶法的粗提物与中华眼镜蛇毒即有较明显沉淀反应,其效价随着纯度的提高而增强。将马源性抗血清的蛋白质含量调至与浓缩的IgY相同(2mg/m l),经双向免疫扩散及免疫电泳鉴定,该抗体不但对中华眼镜蛇毒有特异性结合,与孟加拉眼镜蛇毒亦有较强的交叉免疫活性,其效价较马抗眼镜蛇毒血清高4倍以上。结论用中华眼镜蛇原毒制备的IgY抗体,其效价较马抗血清有显著提高,并与孟加拉眼镜蛇毒有高度交叉免疫。本实验为抗眼镜蛇IgY的应用及其它抗蛇毒IgY的制备奠定了基础。     

Passive protection of shrimp against white spot syndrome virus (WSSV) using specific antibody from egg yolk of chickens immunized with inactivated virus or a WSSV-DNA vaccine

White spot syndrome virus (WSSV) causes high mortality and large economic losses in cultured shrimp. The VP28, VP19 and VP15 genes encode viral structural proteins of WSSV. In this study, hens were immunized with recombinant plasmid (pCI-VP28/VP19/VP15) with linkers or with inactivated WSSV, which used CpG oligodeoxynucleotides (CpG ODNs) and Freund's adjuvant as adjuvant, respectively. Egg yolk immunoglobulin (IgY) from hens immunized with inactivated vaccine and DNA vaccine was obtained, purified and used for protection of Metapenaeus ensis shrimp against WSSV. The data showed that the antibody response of the hens immunized with the DNA vaccine was improved by CpG ODNs as adjuvant, but was still inferior to inactivated WSSV in both sera and egg yolks. Using specific IgY from hens immunized with inactivated WSSV and DNA vaccine to neutralize WSSV, the challenged shrimp showed 73.3% and 33.3% survival, respectively. Thus, the results suggest that passive immunization strategy with IgY will be a valuable method against WSSV infection in shrimp.     

Preparation of Immunoglobulin Y (IgY) Against Lipopolysaccharide using Gel Chromatography from the Yolks of Eggs Laid by Immunized Hens

The objective is to prevent and treat injuries caused by lipopolysaccharide (LPS) from gram negative bacteria in animals and humans, we produced antibodies against LPS from egg yolk. LPS from E. coli (O111:B4) mixed with Freund’s Adjuvant was used as the immunogen to immunize Roman hens. Immunized eggs were collected, and immunoglobulin Y (IgY) was purified using a water solution, salt precipitation and gel chromatography. The molecular weight and purity were determined by SDS–PAGE, the antibody titer by noncompetitive enzyme-linked immunosorbent assay (ELISA) and antibody activity against LPS by the mortality of mice intraperitoneally injected with LPS or LPS-IgY solutions. IgY against LPS showed two protein bands at 68 and 26 kDa on the gel; the antibody titer was almost 1:25,600. After incubation with LPS, IgY decreased the mortality of mice challenged with LPS. This study provided an efficient way to produce high-titer egg yolk antibodies, which could attenuate lethal effects of LPS, by immunizing hens. Furthermore, the LPS antibody was purified well using a water solution, salting-out and gel chromatography.     

抗甲型流感鸡卵黄抗体的制备及效价测定

目的:研究抗甲型流感卵黄抗体的制备与纯化,并探讨其效价随免疫时间的变化关系。方法:用灭活甲型流感病毒复合抗原免疫蛋鸡,用PEG6000对卵黄抗体进行分离提取,SDS-PAGE法对其进行分子量测定,考马斯亮蓝法对其含量和纯度进行测定,用微量凝集法检测蛋鸡血清抗体和卵黄抗体的效价。结果:提取得到的卵黄抗体重链分子量为66 kDa、轻链分子量分26 kDa,每毫升卵黄液可得到纯度为95.80%的卵黄抗体9.98mg,回收率93.01%;高效价持续时间90 d以上;免疫蛋鸡血清和卵黄中3种特异性抗体的消长规律基本相似,但抗体水平之间存在明显的差异。结论:采用灭活甲型流感病毒复合抗原免疫蛋鸡可制备高效价、高纯度抗甲型流感卵黄抗体,为卵黄抗体在甲型流感防治中的应用研究奠定了基础。     

The purification of IgY from chicken egg yolk by preparative electrophoresis

Chicken IgY has been purified from egg yolk by preparative electrophoresis on the Gradiflow, a system which has been employed for the purification of a wide range of proteins with high recovery and biological activity. Protein purification on the Gradiflow utilises electrophoresis with selected combinations of porous membranes and buffers. The purification of IgY was achieved by initial PEG lipid precipitation, then a single step Gradiflow run by a strategy based on the relatively high pI range of IgY compared to other egg yolk proteins. The IgY yields obtained from the delipidised supernatant are consistently greater than 80% by immunoassay. The purity of the IgY fraction compared favourably with IgY prepared using three commercial products.     

A novel and efficient immunoglobulin Y extraction method using poloxamer-polyethylene glycol

Although many IgY extraction methods (such as polyethylene glycol (PEG) precipitation method, octanoic acid method, water dilution method, etc.) have been established, there is still industrial drive and real need in developing scale-up IgY production methods. Some previous studies have reported that poloxamer degreasing method shows very good result in IgY extraction from egg yolk with high degreasing speed, harmlessness, simpleness in operation and minimal effect on antibody titer. In this study, we developed a new method, poloxamer-PEG method, to obtain functional IgY with high purity and yield. First, the delipidation solution was added into the diluted yolk samples, and then the filtrates were collected from the diluted yolk samples after 3?hr in room temperature. PEG-6000 was added into the collected filtrates and the mixture was centrifuged after shaking on the roller mixer for 45?min at room temperature. Last, the precipitates were resuspended in 1?mL phosphate buffered solution (PBS) buffer and dialyzed overnight. The results showed that the total protein concentrate of extractive could reach at 30?mg/mL and the purity of the IgY could reach at 92.71% with the novel method, which was superior to the PEG precipitation method and water dilution method.     

IgY Antibodies Protect against Human Rotavirus Induced Diarrhea in the Neonatal Gnotobiotic Piglet Disease Model

Group A Rotaviruses are the most common cause of severe, dehydrating diarrhea in children worldwide. The aim of the present work was to evaluate protection against rotavirus (RV) diarrhea conferred by the prophylactic administration of specific IgY antibodies (Ab) to gnotobiotic piglets experimentally inoculated with virulent Wa G1P[8] human rotavirus (HRV). Chicken egg yolk IgY Ab generated from Wa HRV hyperimmunized hens specifically recognized (ELISA) and neutralized Wa HRV in vitro. Supplementation of the RV Ab free cow milk diet with Wa HRV-specific egg yolk IgY Ab at a final ELISA Ab titer of 4096 (virus neutralization –VN- titer = 256) for 9 days conferred full protection against Wa HRV associated diarrhea and significantly reduced virus shedding. This protection was dose-dependent. The oral administration of semi-purified passive IgY Abs from chickens did not affect the isotype profile of the pig Ab secreting cell (ASC) responses to Wa HRV infection, but it was associated with significantly fewer numbers of HRV–specific IgA ASC in the duodenum. We further analyzed the pigś immune responses to the passive IgY treatment. The oral administration of IgY Abs induced IgG Ab responses to chicken IgY in serum and local IgA and IgG Ab responses to IgY in the intestinal contents of neonatal piglets in a dose dependent manner. To our knowledge, this is the first study to show that IgY Abs administered orally as a milk supplement passively protect neonatal pigs against an enteric viral pathogen (HRV). Piglets are an animal model with a gastrointestinal physiology and an immune system that closely mimic human infants. This strategy can be scaled-up to inexpensively produce large amounts of polyclonal IgY Abs from egg yolks to be applied as a preventive and therapeutic passive Ab treatment to control RV diarrhea.