摘要
背景:目前国内外对白细胞相关免疫球蛋白样受体(leukocyte-associated immunoglobulin like-receptor,LAIR)家族中LAIR1的生物学功能研究已较清晰,而关于LAIR-2分子在机体内的生物学功能尚缺乏相关报道。目的:为进一步研究LAIR-2的体内生物学功能,构建其真核表达载体,纯化并鉴定蛋白。设计、时间及地点:单一样本观察实验,于2007-06/2008-06在解放军第四军医大学完成。材料:载体pIg/3c由英国牛津大学徐小宁博士惠赠。载体pcDNA3.1由荷兰Meyaard博士惠赠。中国仓鼠卵巢细胞系CHO由解放军第四军医大学免疫学教研室冻存。方法:构建pIg/3c-LAIR-2及pcDNA3.1-LAIR-2两个真核表达载体,电转染法转染CHO细胞建立稳定表达LAIR-2-Fc融合蛋白及LAIR-2全长蛋白分子的细胞株,通过Westernblot、细胞免疫化学、流式细胞术分析实验鉴定真核表达LAIR-2蛋白分子与抗原核表达LAIR-2mAbs的结合活性。主要观察指标:稳定转染细胞系的建立及真核表达蛋白的纯化和鉴定。LAIR-2蛋白与相应单克隆抗体的结合活性。结果:构建真核表达载体并成功转染CHO细胞,建立稳定分泌LAIR-2-Fc融合蛋白的转染细胞系及稳定分泌LAIR-2蛋白的转染细胞系,分别命名为CHO/LAIR-2-Fc以及CHO/LAIR-2。Westernblot实验表明真核表达的LAIR-2全长蛋白分子均可与三株抗LAIR-2mAb1A7、3H12及4A9发生特异性结合反应。免疫细胞化学、流式细胞术分析实验结果表明抗原核细胞表达蛋白的三株LAIR-2单克隆抗体中,1A7不能结合pcDNA3.1-LAIR-2转染的CHO细胞内的LAIR-2,面3H12和4A9均可以很好结合细胞内的LAIR-2。结论:实验成功构建了pIg/3c-LAIR-2及pcDNA3.1-LAIR-2两个真核表达载体,成功转染CHO细胞并建立稳定表达LAIR-2-Fc融合蛋白及LAIR-2全长蛋白分子的细胞株。真核表达的LAIR-2蛋白分子与抗原核表达的LAIR-2mAbs有良好的结合活性。
BACKGROUND： Biological function of leukocyte-associated immunoglobulin like-receptor 1 （LAIR 1） has clearly researched in China and abroad, but the in vivo biological function of LAIR is poorly understood. OBJECTIVE： To establish LAIR-2 （CD306） eukaryotic expression vectors and to purify and identify the fusion protein. DESIGN, TIME AND SETTING： A single sample observation experiment was performed at the Fourth Military Medical University of Chinese PLA between June 2007 and June 2008. MATERIALS： plg/3c vector was offered by Oxford University. pcDNA3.1 vector was provided by Meyaard doctor. Chinese hamster ovary （CHO） cell lines were preserved by the Department of Immunology, Fourth Military Medical University of Chinese PLA. METHODS： Two eukaryotic expression vectors plg/3c-LAIR-2 and pcDNA3.1-LAIR-2 were constructed and were transfected into CHO cells. The binding activities of LAIR-2 fusion protein to LAIR-2 mAbs were identified by Western blot, immunocytochemistry and flow cytometry assay. MAIN OUTCOME MEASURES： The construction of stably transfected cell lines, and the purification and identification of fusion protein. The activity of LAIR 2 protein combined to corresponding monoclonal antibody. RESULTS： Eukaryotic expression vectors were constructed and trasnsfected into CHO cells successfully. Two cells lines CHO/LAIR-2-Fc and CHO/LAIR-2 that steadily expressed LAIR-2-Fc fusion protein and LAIR-2 protein were established. Western blot assay showed that LAIR-2 protein could bind specially to LAIR-2 mAb 1A7, 3H12 and 4A9. Immunocytochemistry and flow cytometry assay demonstrated that 3H12 and 4A9 could bind to LAIR-2 expressed in the transfected CHO cells. CONCLUSION： Two cells lines CHO/LAIR-2-Fc and CHO/LAIR-2 were successfully constructed, which can transfected to CHO cells. The eukaryotic expressed LAIR-2 protein has good binding activity to LAIR-2 mAbs.
出处
《中国组织工程研究与临床康复》
CAS
CSCD
北大核心
2009年第50期9928-9932,共5页
Journal of Clinical Rehabilitative Tissue Engineering Research
