【摘要】 目的 :表达人内皮抑素蛋白 ,制备多克隆抗体 ,检测其生物学活性。方法 :采用PCR法扩增人内皮抑素基因 ,构建pGEX -ES融合表达载体 ,IPTG(异丙基硫代 - β-D半乳糖苷 )诱导表达。初步纯化的内皮抑素包含体蛋白制备兔多克隆抗体 ,Western -blot检测其在小鼠肝、肾等的表达。亲和纯化的内皮抑素蛋白用内皮细胞抑制实验检测其生物学活性。结果 :诱导表达的人内皮抑素蛋白经凝血酶酶切后 ,分子量约为 2 0kD ,具有抑制内皮细胞生长的活性。制备的多克隆抗体检测出内皮抑素在小鼠肝、肾等组织的表达。结论 :人内皮抑素的成功表达及抗体制备为抗血管生成治疗实体瘤的研究及检测奠定实验基础更多还原

【Abstract】 AIM: To examine the expression of human endostatin in E.coli , produce its fusion protein antibody and observe its biological activity. METHODS: Endostatin gene was amplified by polymerase chain reaction,recombined with plasmid vector pGEX-2T and induced expression with IPTG.The protein activity was tested by endothelial cell proliferation inhibitory assay.Inclusion body crudely purified was used to generate polyclonal antibody to detect its expression at mouse’s liver and kidney etc. RESULTS: The protein expressed was 20 kD after digestion by thrombin,it appeared the anti-angiogenesis activity and Western blotting indicated the expression of endostatin in liver and kidney of mouse. CONCLUSION: The successful expression of human endostatin and the preparation of polycolonal antibody indicated its potential application in anti-angiogenesis therapy and diagnosis tumors.更多还原