免疫球蛋白制剂对仔猪血清碱性磷酸酶活性和断奶时增重的影响

实验分 2批选用 170头大白仔猪 (40 ,130头 ) ,随机分为 5组 ,均食初乳。A组为对照组 ,其余各组均于出生后 2 4h之内饲喂不同剂量的免疫球蛋白制剂 ,观察对仔猪 10、 2 0日龄血清碱性磷酸酶活性和断奶时增重的影响。结果表明 ,饲喂免疫球蛋白制剂 10ml的仔猪 ,其 10、 2 0日龄血清碱性磷酸酶活性显著高于对照组 (P <0 . 0 5 ) ,断奶时增重极显著高于对照组 (P <0 . 0 1)。     

新生儿Fc受体的研究进展

新生儿Fc受体(FcRn)是负责上皮细胞主动转运免疫球蛋白IgG的受体.IgG是初乳中含量最丰富的免疫球蛋白成分,哺乳动物新生儿的免疫力主要依赖于从母体获得IgG,而母源IgG向乳汁中的分泌以及被新生儿摄取均需要穿越上皮屏障,这一过程就是FcRn的胞转作用.本文对FcRn的特性、转运机制及其研究进展进行综述.     

哺乳仔猪血清中IgG的动态变化

选择３２头自然分娩、初生重１ｋｇ～１．５ｋｇ的大白猪×内蒙黑猪杂交Ｆ１代新生仔猪，研究２８ｄ产后期内血清中ＩｇＧ的动态变化。结果表明，仔猪出生后没吃母乳以前血清中的ＩｇＧ甚微（０．１２±０．０５８ｍｇ／ｍｌ），吃完初乳后血清中ＩｇＧ含量迅速升高，到２４ｈ达到峰值（６０．１０±１１．１８ｍｇ／ｍｌ），随后缓慢下降，到２１ｄ（２０．５３±６．４６ｍｇ／ｍｌ），随后又开始上升。     

超滤法对牛初乳中IgG含量和活性的影响

本文研究了超滤分离牛初乳乳清中IgG的方法，测定不同超滤温度和压力条件下IgG含量和活性的变化情况。结果表明：通过超滤可将乳清中IgG含量提高一倍左右；超滤压力增加，IgG含量相应增加．IgG活性基本不变。在压力0．08MPa时，IgG含量为45．98mg／mL，活性未变，仍为1024；超滤温度增加，初乳中的IgG含量先有较小增加然后减少，IgG活性则下降。在超滤温度40℃时，IgG含量最高，达到46、85mg／mL，IgG活性未有变化。     

双峰驼初乳IgG的分离纯化及其向幼驼的转移

通过跟踪检测内蒙古阿拉善双峰母驼初乳IgG和幼驼血清IgG的动态含量，探讨了影响幼驼由母体获得被动免疫的因素。采用硫酸铵沉淀法2次沉淀乳清蛋白，再结合离子交换层析方法，从双峰驼初乳中分离纯化驼IgG；再用SDS—PAGE鉴定其纯度，测定其分子质量；用分离纯化的驼IgG免疫家兔，制备效价至少为1：32的兔抗驼IgG抗血清，采用单向免疫扩散法测定双峰驼初乳和幼驼血清IgG含量。揭示了初乳IgG向幼驼血液的转移模式，为生产中更好地饲养幼驼提供科学依据。     

柔嫩艾美尔球虫实验感染雏鸡体液免疫机制研究

本文通过人工复制的鸡球虫病鸡,利用免疫组化技术等方法,检测了柔嫩艾美耳球虫(E.tenella)初次感染雏鸡后,盲肠局部和免疫器官中IgG生成细胞数的动态变化。结果表明:攻毒后雏鸡盲肠粘膜、脾脏、法氏囊、盲肠扁桃体中的IgG生成细胞分别于第3、3、3、2d开始增殖,在第12、12、16、9d达到峰值,随后即开始下降,盲肠扁桃体中的IgG生成细胞数在第22d仍高于对照组,且差异显著(P<0.05)。     

免疫途径对鸡全身性免疫应答水平的影响

本研究观察了蛋白抗原的自由饮水、皮下注射和强饲途径对鸡免疫应答能力的影响。结果显示，注射免疫和饮水免疫处理组所产生的IgG应答明显强于强饲免疫处理组和未免疫的对照组（P〈0．05），这说明抗原接触途径中的自由饮水免疫方式与注射免疫方式同样有效，这为商品家禽接种纯化的蛋白抗原提供了一种崭新的途径。     

三抗体间接Dot-ELISA检测犬旋毛虫病IgG抗体的研究

本试验成功地建立了检测旋毛虫病犬血清中的特异性抗体的一种新的免疫学诊断法 -三抗体间接 Dot-EL ISA法 ,并与压片镜检法 (TSM)和琼脂扩散试验 (AGID)进行了比较。试验结果表明 ,Dot- EL ISA和 AGID对2 4 5份被检血清的阳性检出率为 2 2 .86 % (5 6 / 2 4 5 )和 6 .94 % (17/ 2 4 5 ) ,两者符合为 30 .36 %。该法的检出率比AGID高 15 .92 % ,比 TSM高 18.37%。Dot- EL ISA的相对灵敏度为 AGID的 6 7.4 7倍     

Specific binding of bovine, ovine, caprine and equine IgG subclasses to defined types of immunoglobulin receptors in gram-positive cocci

One hundred and twenty bacterial strains were tested for non-immune binding of radiolabelled bovine, ovine, caprine and equine immunoglobulins. Bacteria possessing previously defined IgG receptors interacted in a well defined manner with purified IgG subclass immunoglobulins. Human group C and G streptococci carrying IgG receptors type III were capable of binding all IgG subclasses in the four mammalian species studied. Protein A-containing staphylococci demonstrated a restricted specificity with binding of bovine IgG1, ovine IgG1, caprine IgG1 and IgG2 as well as equine IgG(ab). Group A streptococci which can bind human IgG did not show specific reactivity. A new type of binding unrelated to the regular Fc-mediated binding was observed with equine IgG(T).The differences in specificity for IgG subclasses suggest that structures with binding capacity to streptococcal type III Fc receptors are different from staphylococcal protein A reactive sites. Inhibition experiments performed with purified immunoglobulins showed that individual IgG subclasses differed greatly in their inhibiting capacity reflecting differences in avidity.The high avidity and the broad, unrestricted immunoglobulin G reactivity of streptococcal IgG receptor type III indicate that human group C and G streptococci may provide a valuable tool for solid phase absorption of immunoglobulins from several mammalian species.     

Serum antibodies to Malassezia yeasts in canine atopic dermatitis

Significant numbers of humans with atopic dermatitis develop Malassezia-specific IgE. Immediate skin-test reactivity to Malassezia has been demonstrated in atopic dogs. The aim of this study was to compare the serum IgG and IgE response to Malassezia in atopic dogs with and without clinical evidence of Malassezia dermatitis and/or otitis, nonatopic dogs with clinical evidence of Malassezia dermatitis and/or otitis and healthy dogs. Cytology was used to diagnose clinically significant Malassezia dermatitis and otitis. Contact plate cultures confirmed the validity of this technique. Reproducible enzyme-linked immunosorbent assays for Malassezia-specific IgG and IgE in canine serum were established. Atopic dogs had significantly higher serum IgG and IgE levels than either healthy dogs or nonatopic dogs with clinical evidence of Malassezia dermatitis and/or otitis. There was no significant difference in IgG and IgE levels between atopic dogs with and without clinical evidence of Malassezia dermatitis and/or otitis. The implications of these findings in the pathogenesis and management of canine atopic dermatitis are discussed.