重组马白细胞介素-18的鉴定及其定量抗原捕获ELISA检测方法的建立
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摘要
白细胞介素-18(IL-18)是一种重要的细胞因子,它能作用于I型辅助性T细胞(Th1),并在IL-12的协同作用下能强烈诱导其产生IFN-γ。近来研究表明:IL-18具有广泛的生物学活性,在介导细胞免疫、抵抗微生物感染和抗肿瘤方面起着重要的作用。因此,IL-18在临床上可作为免疫增强剂、抗微生物或抗肿瘤制剂得以应用。到目前为止,国内外已有人、小鼠、猴、猪、牛和羊等种属的IL-18商品化制剂及其相应的单克隆抗体(McAb)或多克隆抗体(PcAb)以及夹心ELISA试剂盒的商品化供应。然而,有关马IL-18(EIL-18)的研究较少且相对滞后,迄今为止,还未见有可供商品化的EIL-18和抗EIL-18 McAb或PcAb及其夹心ELISA试剂盒等相关产品。
     本研究采用RT-PCR从经ConA刺激的马外周血单核细胞(PBMCs)中扩增获得编码EIL-18前体蛋白(precursor EIL-18,pEIL-18)的DNA,然后克隆至载体pMD18-T中,鉴定正确的重组质粒命名为pMD-EIL-18。自pMD-EIL-18中分别扩增pEIL-18及其成熟蛋白(mature EIL-18,mEIL-18)基因,并将其亚克隆至原核表达载体pET-28a(+)和pET-26b(+)中,重组质粒鉴定正确后命名为pET-pEIL-18、pET-EIL-18和pET-mEIL-18。然后分别转化至大肠杆菌感受态BL21(DE3)中进行诱导表达,表达产物经SDS-PAGE分析,结果表明所得到重组蛋白分别约为25kD、20kD和18kD,经Western-blot鉴定结果表明这3种重组蛋白均能与兔抗人IL-18发生免疫学反应,将这3种表达的重组蛋白分别命名为rpEIL-18、rEIL-18和rmEIL-18。在此基础上,本研究建立了rpEIL-18、rEIL-18和rmEIL-18在非变性状态下通过镍柱亲和层析或偶联了抗EIL-18 McAb的CNBr-activated Sepharose 4B亲和层析纯化重组蛋白的方法,采用该方法纯化获得了高纯度的重组蛋白rpEIL-18、rEIL-18和rmEIL-18。为鉴定所获得的重组蛋白rpEIL-18、rEIL-18和rmEIL-18是否具有生物学活性,本研究还建立了一种检测马IFN-γmRNA拷贝数的实时荧光定量RT-PCR方法,并采用本方法评价了rpEIL-18、rEIL-18和rmEIL-18在重组人白细胞介素-12(rhIL-12)协同下在体外刺激马PBMCs所产生IFN-γ的状况。结果表明,rpEIL-18不具有相应的生物学活性,而rEIL-18和rmEIL-18具有类似天然EIL-18生物学活性的特性。
     利用上述纯化后的rEIL-18抗原免疫新西兰白兔,制备了高效价的抗EIL-18 PcAb。同时,采用相同抗原免疫BALB/c小鼠,取脾细胞与SP2/0骨髓瘤细胞进行融合,以昆虫/杆状病毒表达系统获得的重组mEIL-18(rAcEIL-18)作为检测抗原进行间接ELISA检测,共筛选获得9株能稳定分泌抗体的单细胞克隆株。利用Western-blot和IFA实验对9株单克隆抗体(McAbs)进行鉴定,结果显示,所获得的9株细胞分泌的抗体均能与rEIL-18和rAcEIL-18发生特异性反应。将此9株McAbs分别与用原核系统分段表达的重组马白细胞介素-18成熟蛋白mEIL-181-78和mEIL-1879-157进行特异性ELISA检测,结果表明,其中5株能识别所表达的mEIL-181-78,而另外4株能与mEIL-1879-157发生反应,说明所获得的9株McAbs至少能针对rmEIL-18 2个或2个以上不同的抗原表位。采用单克隆抗体亚型鉴定试剂盒对该9株McAbs进行亚型鉴定,结果表明,除M1F11、M3A11和N7D9为IgM,其余的McAbs均为IgG1,而且所有McAbs的轻链均为κ链。将9株McAbs分别与rEIL-18和rmEIL-18进行中和活性测定,结果表明S1D7株对有生物活性的rEIL-18和rmEIL-18均具有中和效应。
     将抗EIL-18的McAbs和PcAb进行粗提和亲和层析纯化,并对纯化后S6A3和B1G1株McAbs和PcAb进行生物素标记。通过对各株McAb或PcAb分别作为捕获抗体或检测抗体进行初步的配对筛选后,以亲和纯化的S6A3株McAb作为捕获抗体,生物素标记的B1G1株McAb作为检测抗体,经方阵试验优化抗原捕获ELISA反应体系,以不同浓度梯度的rEIL-18为捕获抗原进行ELISA检测绘制其OD值-抗原浓度标准曲线,确定检测灵敏度为15pg/mL。采用所建立的抗原捕获ELISA检测方法对健康和EIAV感染的马血清及猪、牛、羊血清进行检测,结果表明,猪血清、牛血清和羊血清在该检测方法中均无发生交叉反应性,健康马血清中EIL-18的含量在40-80pg/mL之间,而EIAV感染后的马血清中EIL-18含量略微升高,在70-150pg/mL之间。由于各种属的IL-18存在一定的交叉反应性,为了检测本研究所获得抗EIL-18 McAbs是否能够用于检测其他种属IL-18并确定其检测极限,参照配对筛选结果和上述建立好的EIL-18定量抗原捕获ELISA检测方法,以S1C6株McAb作为捕获抗体,生物素化的抗EIL-18 PcAb为检测抗体,商品化的重组猪IL-18(rPIL-18)为捕获抗原绘制OD值-抗原浓度标准曲线,确定检测灵敏度为30pg/mL,建立了基于抗EIL-18抗体为检测和捕获抗体的猪IL-18(PIL-18)定量抗原捕获ELISA检测方法;以S5F1株McAb作为捕获抗体,生物素化的抗EIL-18 PcAb为检测抗体,初步建立了以抗EIL-18抗体为检测和捕获抗体的牛IL-18(BIL-18)定量抗原捕获ELISA检测方法。
Interleukin-18 (IL-18) is an important cytokine, which can act on T helper 1-type T cells and strongly induce them to produce IFN-γin combination with IL-12. Pleiotropic effects of IL-18 have recently been reported. It plays an important role in the development of cell-mediated immune responses, defending the infection of microbial and resisting the tumor. Therefore, IL-18 may be used as an immune regulatory, anti-microbes and/or anti-tumor agent in clinic. So far, the products of human, mouse, monkey, porcine, bovine, goat IL-18 and the monoclonal or polyclonal antibody reagents against them have been developed, as well as the relative double-antibody ELISA kits. However, the function and relative studies of equine IL-18 (EIL-18) is still poorly understood. Even no any products of EIL-18, anti-EIL-18 monoclonal or polyclonal antibody or double-antibody ELISA kits come out yet.
     In this study, the DNA of EIL-l8 was amplified by RT-PCR from the total RNA extracted from ConA stimulated equine PBMCs, and subsequently cloned into the vector pMD18-T, sequenced and named pMD-EIL-18. Then the genes encoding precursor and mature EIL-l8 were amplified from pMD-EIL-18 by PCR and subcloned into pET-28a(+) and pET-26b(+) respectively and recombinant plasmids (pET-pEIL-18, pET-EIL-18 and pET-mEIL-18) were obtained after sequencing confirmation. High levels of rpEIL-18, rEIL-18 and rmEIL-18 proteins were successfully expressed in E. coli strain BL21 (DE3) transformed with pET-pEIL-18, pET-EIL-18 and pET-mEIL-18. The SDS-PAGE and Western-blot analysis indicated that the fusion proteins were 25kD, 20kD and 18kD in molecular weight and had immunological reaction with rabbit against human IL-18 antibody. High-purity of recombinant proteins were recovered after purification with a Ni2+NTA column or CNBr-activated Sepharose 4B conjugated anti-EIL-18 McAb column. To identify whether or not rpEIL-18, rEIL-18 and rmEIL-18 proteins have biological activity, the method of real-time quantitative RT-PCR was established to detect the mRNA products of equine IFN-γfrom equine PBMCs stimulated with these recombinant proteins in vitro. The results showed that rEIL-18 and rmEIL-18 had a synergistic effect to induce the expression of IFN-γgene in equine PBMCs with the presence of recombinant human IL-12. All these results also indicated that the rEIL-18 and rmEIL-18 expressed in this study had biological activity commensurate with the native molecule. However, the rpEIL-18 had no such activity.
     Rabbits were immunized subcutaneously with purified rEIL-18 proteins and high titers of PcAbs against EIL-18 were obtained subsequently. Meanwhile, BALB/c mice were immunized intraperitoneally with the same antigens for EIL-18 McAb preparation. After murine myeloma cells were fused with the splenocytes from the immunized mice, an indirect ELISA using the rAcEIL-18 protein derived from baculovirus expression system as antigen was carried to screen antibody-producing hybridomas. Consequently, nine McAbs against EIL-18 were got and Western-blot and IFA analysis showed all of them had positive reaction with rEIL-18 and rAcEIL-18 respectively. These 9 McAbs were used to react with mEIL-18 1-78aa and mEIL-18 79-157aa respectively in specific ELISA tests. As a result, five of them showed positive reaction to mEIL-18 1-78aa, the others had positive reaction to mEIL-18 79-157aa. McAb subtype identification kit was used to make sure which subtype these 9 McAb belonged to. The results showed three of them were IgM isotype and the rest ones belonged to IgG1 isotype, and the light chains of all McAbs wereκchain. Additional study displayed that the S1D7 McAb could effectively neutralize the bioactivity of rEIL-18 and rmEIL-18.
     The McAbs and PcAb against EIL-18 were purified with extraction and immunoaffinity chromatography methods. And S6A3, B1G1 McAbs and PcAb were chosen to be biotinylated. After all of McAbs and PcAb were screened for the matched-pairs of double-antibody ELISA, a sandwich ELISA was developed to detect the EIL-18 by using purified S6A3 McAb as a capture antibody and the biotinylated B1G1 McAb as a detection antibody. And the limit of detection for the concentration of EIL-18 was 15pg/mL by this method.
     Sera samples from health and EIAV-infected horse, pig, bovine and sheep were employed to measure the levels of IL-18 using the method established in this study. The results showed no cross-reaction occurred to pig, bovine and sheep sera samples in this testing method. What’s more, the IL-18 level from healthy horse serum was 40-80 pg/mL, while that was 70-150 pg/mL for EIAV-infected horse. Because of cross-reaction, porcine and bovine IL-18 quantitative sandwich ELISA was preliminarily established according to the EIL-18 quantitative sandwich ELISA. A sandwich ELISA for the detection of porcine IL-18 was developed using purified S1C6 McAb as a capture antibody and the biotinylated PcAb against EIL-18 as a detection antibody. The limit of detection for porcine IL-18 concentration was 30pg/mL in this sandwich ELISA. Additionally, the sandwich ELISA for the detection of bovine IL-18 was also preliminary established by using purified S5F1 McAb as a capture antibody and the biotinylated PcAb against EIL-18 as a detection antibody.
引文
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