大肠杆菌表达的新一代重组人内皮抑素复性条件的优化

Optimization of recombinant human endostatin refolding

目的优化新一代重组人内皮抑素(rhED)的复性方案并检测其抗血管生成活性。方法用6 mol/L盐酸胍溶解rhED包涵体后,用稀释法与透析法相结合的方法进行复性,优化最适复性条件。复性结束后用阳离子交换层析纯化。并用rhED特异性单抗和鸡胚绒毛尿囊膜实验检测复性后蛋白的活性。结果通过优化复性条件,rhED的复性率可达到46%。复性、纯化后的rhED能与rhED特异性单抗反应,并在鸡胚绒毛尿囊膜实验中显示出抑制血管生长的活性。结论提高rhED复性率的复性条件可极大地促进新一代rhED的临床前及临床研究。

Objective To optimize the conditions for enhancing the refolding of a novel recombinant human（rh） endostatin and test the biological activities of refolded endostatin.Methods The partial purified inclusion bodies of rh-endostatin were dissolved with 6 mol/L guanidine-HCl followed by combination of dilution and dialysis of the dissolved endostatin.The refolded endostatin was then purified by cation-exchange chromatography.The biological activities of purified rh-endostatin were assessed by endostatin-specific monoclonal antibody and chick embryo chorioallantoic membrane assay.Results A 46% refolding yield was achieved after optimizing the refolding conditions.The purified endostatin reacted with specific anti-endostatin monoclonal antibody and showed significant inhibition of angiogenesis in chick embryo chorioallantoic membrane assay.Conclusion The method of highest refolding yield of human endostatin was developed.This optimized method significantly promotes the application of this novel human endostatin to preclinical and clinical studies.