Prokaryotic expression and purification of fusion protein HSP70-EGFP and its application in the study of dendritic cell internalization antigen
- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 12
- DOI:
- 10.3321/j.issn:1000-2790.2007.12.001
- Key Word:
- 吞噬作用;受体介导;树突细胞;重组融合蛋白质类;热休克蛋白质70;绿色荧光蛋白质类
Abstract： 目的:研究树突状细胞(DCs)对热休克蛋白70(HSP70)融合蛋白的内化作用.方法:首先原核表达并分离纯化HSP70和增强型绿色荧光蛋白(EGFP)的融合蛋白HSP70-EGFP.实验中所用DCs来源于人外周血.内化实验分3组进行:将1,2组DCs分别与融合蛋白HSP70-EGFP和蛋白EGFP孵育30 min;第3组先将DCs与HSP70孵育30 min,再与HSP70-EGFP孵育30 min.之后将3组DCs转至37 ℃孵箱内,培养0.5,1,2和24 h,应用流式细胞仪检测含HSP70-EG-FP或EGFP的DCs数量.应用IL-12 Eli-spot法检测HSP70-EGFP等抗原促进DCs分泌IL-12的效果.结果:①成功获得了重组蛋白HSP70-EGFP,Mr约为97 000,HSP70-EGFP表达量占总蛋白的35.7%.纯化后的融合蛋白HSP70-EGFP溶液经紫外线灯照射时发出鲜绿色的荧光.②流式细胞仪检测结果显示在37 ℃孵育0.5 h后,HSP70-EGFP孵育的DCs组阳性率为63.3%,其余两组为阴性.在37 ℃孵育1,2和24 h后,3组阳性率均大于80.0%.IL-12 Eli-spot检测结果显示,在刺激DCs活化及分泌IL-12的水平上,HSP70-EGFP与脂多糖(LPS)之间的差别无统计学意义(P＞0.05),而HSP70-EG-FP的活化DCs能力明显高于EGFP(P=0.001).结论:①受体介导的吞噬作用在DCs内化HSP70-EGFP的初始阶段起主要作用,随孵育时间的延续,吞饮作用占主要地位.②HSP70-EGFP可促进DCs分泌特征性细胞因子IL-12.
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