Objective To study the human myxovirus resistant protein A （MxA）, a specifically induced peptide by interferon I, and to use its level as a diagnostic criterion for viral infections. Methods Anti-MxA antisera from i...Objective To study the human myxovirus resistant protein A （MxA）, a specifically induced peptide by interferon I, and to use its level as a diagnostic criterion for viral infections. Methods Anti-MxA antisera from immunized mice were prepared with the expressed MxA protein of pET32a-MxA in E. coli BL-21（DE3）. To confirm the antiserum activity and specificity, the expression product of BL21, wild type MxA pEGFP-CI-wMxA and site-directed mutant MxA pEGFP-Cl-mMxA（N589S） stably transfected 3T3 cells and induced A549 cells were detected by Western blot with the antisera using non-MxA transfected or non-IFN-[3 induced cells, intact A549, NIH 3T3 cells transfected with pEGFP-CI and pET32a （＋）-transformed BL-21 as controls. Results The antisera had specific positive immunoreactivity to the NIH3T3 cells transformed with pEGFP-CI-wMxA and pEGFP-CI-mMxA, INF-β induced A549 cells and BL21 proteins expressed with pET32a （＋）-MxA. The hybridization signals from IFN-β induced A549 cells depended on the IFN-β inducing concentrations. Meanwhile, immunohistochemical assay showed that NIH 3T3 cells with pEGFP-C 1-wMxA and pEGFP-C 1-mMxA had 〉 98% of positive cells at 1：50 dilution of the serum and A549 cells induced by 20 ng/mL IFN-[3 for 48 h showed 95% positive cells. pEGFP-Cl-transfected NIH 3T3 cells were all negative. Conclusion Anti-sera are highly specific to diversified MxAs. The antibody is detectable by Western blot, immunocytochemistry and immunofluorescence assay.展开更多
分别采用Sepharose-6B凝胶过滤层析、Phenyl Sepharose FF疏水作用层析和rProtein A Sepharose亲和层析技术纯化黄鳍棘鲷(Acanthopagrus latus)血清IgM,并将这3种层析纯化方法进行了比较。纯化产物进行SDS-PAGE,电泳结果扫描后经Band Sc...分别采用Sepharose-6B凝胶过滤层析、Phenyl Sepharose FF疏水作用层析和rProtein A Sepharose亲和层析技术纯化黄鳍棘鲷(Acanthopagrus latus)血清IgM,并将这3种层析纯化方法进行了比较。纯化产物进行SDS-PAGE,电泳结果扫描后经Band Scan5.0软件分析显示,单独使用Sepharose-6B凝胶过滤层析或Phenyl Sepharose FF疏水作用层析得到的IgM纯度只有56%左右;二者联合使用纯度可以达到69%,而rProtein A Sepharose亲和层析一步就可以达到89%的纯度;纯化得到的黄鳍棘鲷血清IgM的重链和轻链分子量分别为73.6kD和26.5kD。本研究还以rProtein A Sepharose亲和层析纯化的黄鳍棘鲷血清IgM为抗原,制备其兔抗血清,采用WesternBlot和双向琼脂扩散检测抗血清免疫学活性,并用间接ELISA检测其效价达到1∶25600,为进一步开展黄鳍棘鲷免疫学方面的研究奠定了基础。展开更多
采用盐析法、重组蛋白A(HiTrapr Protein A Sepharose)亲和层析法分离纯化草鱼血清中的IgM,并通过SDS-PAGE及Western-blot技术对纯化蛋白的部分特性进行分析比较并制备兔抗IgM抗血清。结果表明:33%硫酸铵溶液可以沉淀血清中大部分蛋白,...采用盐析法、重组蛋白A(HiTrapr Protein A Sepharose)亲和层析法分离纯化草鱼血清中的IgM,并通过SDS-PAGE及Western-blot技术对纯化蛋白的部分特性进行分析比较并制备兔抗IgM抗血清。结果表明:33%硫酸铵溶液可以沉淀血清中大部分蛋白,但电泳条带仍较多,其中含有78kD和28kD的条带,因此仅可作为免疫球蛋白粗提的方法;而rProtein A亲和层析法所提蛋白则仅有上述重链(78kD)和轻链(28kD)。Western-blot显示,鼠抗人Ig抗体可与78kD及28kD条带发生发应。rProtein A亲和法提纯蛋白的纯度较高,但含量较低,条带较淡,仅可作为实验室小量提纯草鱼IgM的有效方法。将提纯的蛋白免疫实验兔后可制得效价高达1:25600的兔抗鱼IgM血清,并测得血清蛋白总量和IgM含量分别为25.87mg和4.5mg,IgM占血清蛋白总量的17.39%。本实验所采用的蛋白A亲和层析法提取草鱼血清IgM可以方便、快捷地获得高纯度的产物,适合在实验室中纯化鱼类IgM。同时本研究所制备的兔抗草鱼IgM血清也为今后的相关研究工作打下基础。展开更多
为深入了解罗非鱼和斑点叉尾鮰免疫机理及建立相关免疫检测方法,采用rProtein A Sepharose亲和层析一步法纯化罗非鱼和斑点叉尾鮰血清免疫球蛋白(IgM),并制备其兔抗血清。结果表明,rProtein A Sepharose亲和层析法可以较好地分离获得高...为深入了解罗非鱼和斑点叉尾鮰免疫机理及建立相关免疫检测方法,采用rProtein A Sepharose亲和层析一步法纯化罗非鱼和斑点叉尾鮰血清免疫球蛋白(IgM),并制备其兔抗血清。结果表明,rProtein A Sepharose亲和层析法可以较好地分离获得高纯度的罗非鱼和斑点叉尾鮰血清IgM,通过SDS-PAGE电泳检测,发现罗非鱼血清IgM重链和轻链分子量分别为88.0、21.0 kDa,斑点叉尾鮰血清IgM重链分子量为101.0 kDa。以纯化的罗非鱼和斑点叉尾鮰血清IgM为抗原,制备其兔抗血清,间接ELISA检测其效价分别为1∶32000和1∶16000;Western blotting检测分析,发现罗非鱼和斑点叉尾鮰的兔抗血清分别在88.0和101.0 kDa附近各出现1条反应条带,说明其兔抗血清具有免疫活性。展开更多
基金supported by Educational Committee of Jiangsu Province (Grant No: 07KJD180183)
文摘Objective To study the human myxovirus resistant protein A （MxA）, a specifically induced peptide by interferon I, and to use its level as a diagnostic criterion for viral infections. Methods Anti-MxA antisera from immunized mice were prepared with the expressed MxA protein of pET32a-MxA in E. coli BL-21（DE3）. To confirm the antiserum activity and specificity, the expression product of BL21, wild type MxA pEGFP-CI-wMxA and site-directed mutant MxA pEGFP-Cl-mMxA（N589S） stably transfected 3T3 cells and induced A549 cells were detected by Western blot with the antisera using non-MxA transfected or non-IFN-[3 induced cells, intact A549, NIH 3T3 cells transfected with pEGFP-CI and pET32a （＋）-transformed BL-21 as controls. Results The antisera had specific positive immunoreactivity to the NIH3T3 cells transformed with pEGFP-CI-wMxA and pEGFP-CI-mMxA, INF-β induced A549 cells and BL21 proteins expressed with pET32a （＋）-MxA. The hybridization signals from IFN-β induced A549 cells depended on the IFN-β inducing concentrations. Meanwhile, immunohistochemical assay showed that NIH 3T3 cells with pEGFP-C 1-wMxA and pEGFP-C 1-mMxA had 〉 98% of positive cells at 1：50 dilution of the serum and A549 cells induced by 20 ng/mL IFN-[3 for 48 h showed 95% positive cells. pEGFP-Cl-transfected NIH 3T3 cells were all negative. Conclusion Anti-sera are highly specific to diversified MxAs. The antibody is detectable by Western blot, immunocytochemistry and immunofluorescence assay.
文摘分别采用Sepharose-6B凝胶过滤层析、Phenyl Sepharose FF疏水作用层析和rProtein A Sepharose亲和层析技术纯化黄鳍棘鲷(Acanthopagrus latus)血清IgM,并将这3种层析纯化方法进行了比较。纯化产物进行SDS-PAGE,电泳结果扫描后经Band Scan5.0软件分析显示,单独使用Sepharose-6B凝胶过滤层析或Phenyl Sepharose FF疏水作用层析得到的IgM纯度只有56%左右;二者联合使用纯度可以达到69%,而rProtein A Sepharose亲和层析一步就可以达到89%的纯度;纯化得到的黄鳍棘鲷血清IgM的重链和轻链分子量分别为73.6kD和26.5kD。本研究还以rProtein A Sepharose亲和层析纯化的黄鳍棘鲷血清IgM为抗原,制备其兔抗血清,采用WesternBlot和双向琼脂扩散检测抗血清免疫学活性,并用间接ELISA检测其效价达到1∶25600,为进一步开展黄鳍棘鲷免疫学方面的研究奠定了基础。
文摘采用盐析法、重组蛋白A(HiTrapr Protein A Sepharose)亲和层析法分离纯化草鱼血清中的IgM,并通过SDS-PAGE及Western-blot技术对纯化蛋白的部分特性进行分析比较并制备兔抗IgM抗血清。结果表明:33%硫酸铵溶液可以沉淀血清中大部分蛋白,但电泳条带仍较多,其中含有78kD和28kD的条带,因此仅可作为免疫球蛋白粗提的方法;而rProtein A亲和层析法所提蛋白则仅有上述重链(78kD)和轻链(28kD)。Western-blot显示,鼠抗人Ig抗体可与78kD及28kD条带发生发应。rProtein A亲和法提纯蛋白的纯度较高,但含量较低,条带较淡,仅可作为实验室小量提纯草鱼IgM的有效方法。将提纯的蛋白免疫实验兔后可制得效价高达1:25600的兔抗鱼IgM血清,并测得血清蛋白总量和IgM含量分别为25.87mg和4.5mg,IgM占血清蛋白总量的17.39%。本实验所采用的蛋白A亲和层析法提取草鱼血清IgM可以方便、快捷地获得高纯度的产物,适合在实验室中纯化鱼类IgM。同时本研究所制备的兔抗草鱼IgM血清也为今后的相关研究工作打下基础。
文摘为深入了解罗非鱼和斑点叉尾鮰免疫机理及建立相关免疫检测方法,采用rProtein A Sepharose亲和层析一步法纯化罗非鱼和斑点叉尾鮰血清免疫球蛋白(IgM),并制备其兔抗血清。结果表明,rProtein A Sepharose亲和层析法可以较好地分离获得高纯度的罗非鱼和斑点叉尾鮰血清IgM,通过SDS-PAGE电泳检测,发现罗非鱼血清IgM重链和轻链分子量分别为88.0、21.0 kDa,斑点叉尾鮰血清IgM重链分子量为101.0 kDa。以纯化的罗非鱼和斑点叉尾鮰血清IgM为抗原,制备其兔抗血清,间接ELISA检测其效价分别为1∶32000和1∶16000;Western blotting检测分析,发现罗非鱼和斑点叉尾鮰的兔抗血清分别在88.0和101.0 kDa附近各出现1条反应条带,说明其兔抗血清具有免疫活性。
