【摘要】 可溶性肿瘤坏死因子受体II(sTNFRII)和血管活性肠肽(VIP)对类风湿性关节炎(RA)均有治疗作用,但两者的作用机制不同。制备两者融合蛋白,可能具有更好的防治类风湿关节炎的作用。用含有VIP基因序列的上游引物和sTNFRII的下游引物,用PCR扩增出由连接序列将VIP和sTNFRII基因连接的片段,再亚克隆到原核表达载体pET32a,在大肠杆菌DH5α内诱导表达。表达的产物经离子交换、疏水层析纯化,并用体外中和试验检测其抑制TNF细胞毒及肝细胞膜特异性脂蛋白(Lsp)诱导的细胞毒生物活性。结果显示构建的pET32aVIPsTNFRII表达载体在大肠杆菌DH5α内以包涵体形式表达,疏水层析结合离子交换层析纯化后,融合蛋白具有较好的抑制炎症分子诱导的炎症反应生物活性,为将来应用打下基础。更多还原

【Abstract】 A prokaryotic expression plasmid containing VIP (vasoactive intestinal peptide) and sTNFRII(soluble tumor necrosis factor receptor II ) genes was constructed. The sTNFRII was cloned by PCR by using special primers which contained VIP gene ORF and a linker in its forward primer. The amplified fragment was inserted into the expression vector pET32a between BamHI and Hind III restriction sites. Transformed E.coli DH5 by pET32a-VIP- sTNFRIIexpressed the fusion protein. After being identified, the protein was purified by ion exchange chromatography and by hydrophobic interaction chromatography. The reconstructed protein showed high bio-activity and could be applied for further use.更多还原