重组免疫毒素抗c-Met/PE38KDEL免疫毒素的构建?表达及纯化
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卫生部科学研究基金资助项目(Wkj2005-2-027)、江苏省自然科学基金项目(BK2008483)


Construction,expression and purification of an immunotoxin containing a human anti-c-Met single-chain antibody fused to PE38KDEL
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    摘要:

    目的:构建绿脓杆菌外毒素PE38KDEL融合全人源抗c-Met单链抗体原核表达载体,并对其产物进行变性-复性和纯化,检测其对肝癌细胞系的毒性作用-方法:以从人源天然Fab抗体库中筛选出的AM2-26克隆作为模板扩增出人源c-Met单链基因,采用基因工程原理,将扩增出的c-Met单链基因和PE38KDEL基因克隆入pBAD/GⅢA表达载体中,重组克隆载体经酶切及DNA序列测定证实两片段连接正确;转化大肠杆菌Top10F′,左旋阿拉伯糖诱导表达,采用镍离子螯合层析法纯化变性的包涵体样品,并用连续梯度透析的方法对纯化后的包涵体进行复性;采用流式细胞术鉴定复性产物与靶细胞的结合活性,MTT法检测c-Met/PE38KDEL免疫毒素对肝癌细胞的体外杀伤活性-结果:成功构建了免疫毒素表达载体pBAD/GⅢA/c-Met/PE38KDEL;诱导产物主要以包涵体形式存在;复性后的免疫毒素c-Met/PE38KDEL具有与靶细胞特异性结合的活性并且对SMMC7721细胞系具有较明显的杀伤作用-结论:全人源抗c-Met单链抗体与PE38KDEL重组免疫毒素的成功表达纯化及对人肝癌细胞系的试验结果,为进一步肝癌的导向治疗提供依据-

    Abstract:

    Objective:To construct and express a recombinant immunotoxin expression vector composed of a human anti-c-Met single-chain Fv fragment gene and a PE38KDEL gene,and to examine the binding ability of the purified product to human hepatic cellular cancer cell line SMMC 7721. Methods:The human anti-c-Met gene fragments were amplified through PCR then it was subcloned into a PE38KDEL gene inserted fusion protein expression plasmid,which was expressed by pBAD/GⅢA vector. The recombinant vector was identified by restriction endonucleases digestion,PCR and DNA sequencing. After transformed into E.coli Top10F′and induced by L-arabinos,the inclusion bodies were denatured,renatured and refolded,then resolvable protein was purified. The binding ability and effect on cell proliferation test of the purified protein was evaluated by FACS and MTT,respectively. Results:The expression vector pBAD/GⅢA/c-Met/PE38KDEL was constructed successfully and the expression product existed mainly in the form of inclusion body. The refolding product remained the binding ability of the single-chain antibody and had significant effect of cell toxicity. Conclusion:Results of our study on c-Met/PE38KDEL and its effects on SMMC7721 show that the fusion protein would be a promising candidate for tumor targeted immunotherapy.

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朱晓娟,冯振卿,朱 进,张秀华,缪 林,季国忠,范志宁,刘 政.重组免疫毒素抗c-Met/PE38KDEL免疫毒素的构建?表达及纯化[J].南京医科大学学报(自然科学版),2009,29(7):920-924

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  • 收稿日期:2009-02-18
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