Production and Characterization of Recombinant Rat Non-Collagen Domain of α3 Chain of Type IV Collagen α3 (IV) NC1 Antigen

The glomerulonephritis disease is characterized by inflammation of glomeruli or small blood vessels in the kidney that causes kidney diseases. The reason of glomerulonephritis disease is to deposit the anti-GBM auto antibody in the glomerular basement membrane. The type IV collagen is the main component of glomerular basement membrane that has α3 chain of type (IV) collagen of non-collagenous domain which contains N-terminal 7S domain, a triple helical collagenous domain and C-terminal non-collagenous glomerular domain (NC1). The amino terminal of α3 (IV) NC1 that induces the Experimental Autoimmuno Glomerulonephritis (EAG) in rat model has been identified. The recombinant rat α3 (IV) NC1 antigen has nine amino acid spans that are consistent with antibody or T cell epitope that induces in EAG. The research is carried out on the recombinant rat α3 (IV) NC1 production, purification, quantification, and characterization. The circulation of anti-GBM antibody in glomerular basement membrane can be measured by the ELISA assay. In addition, the recombinant rat antigen is secreted in HEK293 cell supernatant that is purified by Anti-FLAG M2 monoclonal IgG antibody affinity column and characterized and quantified by SDS-PAGE gel electrophoresis and Western blotting techniques.

兔抗人CD1d分子α3结构域抗体的制备与鉴定

目的:制备兔抗人CD1d分子α3结构域(hCD1d-α3)多克隆抗体。方法:PCR法扩增出人hCD1d-α3编码区基因,将其克隆入原核表达载体pET28中,转化大肠杆菌BL21(DE3),用IPTG诱导重组蛋白的表达,用Ni2+-NTA Agarose亲和层析法纯化重组蛋白,以之为免疫原免疫家兔,制备多克隆抗体,并用ELISA、Western blot及免疫组织化学法检测抗体。结果:成功构建了hCD1d-α3原核表达载体pET28/h CD1d-α3,高效表达并纯化hCD1d-α3蛋白,间接ELISA检测所制备抗体的效价为1∶6400,Western blot显示该抗体能与hCD1d特异结合,免疫组织化学法检测结果表明该抗体识别人小肠组织中的天然hCD1d。结论:通过制备重组hCD1d-α3蛋白为免疫原,免疫家兔,成功地制备了效价高、特异性好的抗hCD1d-α3多克隆抗体。