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人胰岛素样生长因子1的真核细胞表达及其鉴定
免疫学杂志 2001年第1期第17卷 基础免疫学
作者:徐志伟 娄亚欣 李莹 邓鸿业 邓玉兰
单位:北京大学医学部免疫学系,北京 100083
关键词:人胰岛素样生长因子1;基因重组;真核细胞表达;活性鉴定
摘 要:目的 构建人胰岛素样生长因子1(IGF-1)的真核细胞表达质粒。方法 用PCR方法从人的肝细胞cDNA文库中克隆出IGF-1cDNA,然后定向插入真核细胞表达载体pcDNA3中,并用脂质体方法转染COS7细胞。用ELISA法和人胚肺纤维母细胞以及NIH3T3纤维细胞增殖法分别测定转染细胞上清液中IGF-1的含量和生物活性。结果 重组的真核细胞表达质粒pcDNA3-IGF-1所含的IGF-1cDNA序列和插入方向均正确,其转染的COS7细胞分泌较高浓度的IGF-1,并且具有明显促进纤维细胞增殖的能力。结论 本实验所构建的重组真核细胞表达质粒pcDNA3-IGF-1能够高效表达有活性的IGF-1,对进一步研究IGF-1体内表达的生理和病理作用有一定意义。
分类号:R392.11 文献标识码:A
文章编号:1000-8861(2001)01-0001-04
Expression of human insulin-like growth factor 1 in eukaryotic cell and detection of its activity
XU Zhi-wei(Department of Immunology ,School of Medical Science, Peking University, Beijing 100083,China)
LOU Ya-xin(Department of Immunology ,School of Medical Science, Peking University, Beijing 100083,China)
LI Ying(Department of Immunology ,School of Medical Science, Peking University, Beijing 100083,China)
DENG Hong-ye(Department of Immunology ,School of Medical Science, Peking University, Beijing 100083,China)
DENG Yu-lan(Department of Immunology ,School of Medical Science, Peking University, Beijing 100083,China)
Abstract:Objective To construct eukaryotic expression plasmid for human insulin-like growth factor 1(IGF-1) . Methods IGF-1 cDNA was cloned by PCR from the human liver cDNA library, and inserted into eukaryotic expression vector pcDNA3 with gene recombinant technique, forming recombinant pcDNA3-IGF-1 plasmid. The latter was transfected into COS7 cells with liposome-mediated method.Concentration and activity of IGF-1 in the supernatant were detected by ELISA and fibro-blast proliferation assays respectively. Results IGF-1cDNA sequence and its insertion direction in recombinant pcDNA3-IGF-1 plasmid were are correct. The COS7 cells transfected with the pcDNA3-IGF-1 plasmid secreted high concentration of IGF-1,which markedly induced the proliferation of human fibroblast and NIH3T3 cells. Conclusion The recombinant pcDNA3-IGF-1 plasmid can express active IGF-1 with high efficiency, which facilitates the study of its physical and pathological roles in vivo.
Keywords:insulin-like growth factor 1; gene recombination;eukaryotic cell expression;activity identification基金项目:高校博士点专项科研基金资助项目(教技发中心[1999]26号)
作者简介:徐志伟(1964-),男,山东临朐县人,副教授,博士,主要从事自身免疫病分子机理的研究。现在山东省潍坊市潍坊医学院免疫学教研室,261042。 Tel:(0536)8211542; E-mail:weifangmianyi@yeah.net参考文献:
[1]Jansen M,Van Schaik FMA, Richer AT, et al. Sequence of cDNA encoding human insulin-like growth factor 1 precursor[J]. Nature, 1983,306(8):609-611.
[2]李 莹,邓鸿业, 马大龙, 等.重组人截短型胰岛素样生长因子1在大肠杆菌中的高效表达[J].中国免疫学杂志, 2000, 16(2):57-60.
收稿日期:2000年6月27日
修稿日期:2000年10月8日
出版日期:2001年1月15日