摘要
目的 构建小鼠Cbl-b基因RNA干扰（RNAi）的真核表达质粒,并初步鉴定其干扰效果,为后续研究Cbl-b在黑素瘤免疫治疗中的作用奠定基础.方法 根据基因库提供的Cbl-b cDNA序列,设计并合成4对短发夹结构的互补DNA序列,克隆至载体PGPU6/GFP/Neo构建重组质粒,并予以DNA测序鉴定.重组干扰质粒构建成功后,将干扰质粒与Cbl-b过表达载体共转染293T细胞,于转染后48 h,通过实时荧光定量PCR法及蛋白质印迹法检测各质粒对Cbl-b基因的表达抑制效应.结果 测序分析证实,4对shRNA寡核苷酸序列分别成功插入至shRNA真核表达载体PGPU6/GFP/Neo中,将构建成功的PGPU6/GFP/Neo-shRNA质粒与Cbl-b真核表达载体共转染细胞48 h后,通过荧光实时定量PCR法及Western印迹测定,发现4条shRNA序列对Cbl-b的表达均有一定的抑制效应,其中以1号shRNA序列重组质粒对Cbl-b表达的抑制程度最高（P＜0.05）.结论 成功构建并筛选出沉默效应最高的Cbl-b shRNA真核细胞表达载体.
Objective To construct a eukaryotic expression plasmid vector encoding Cbl-b gene-specific short hairpin RNAs （shRNAs）,and to evaluate its interference effect,so as to lay a foundation for further study on the role of Cbl-b in the immunotherapy of malignant melanoma.Methods According to the sequence of Cbl-b cDNA,4 pairs of shRNAs targeting the Cbl-b gene were designed and synthesized,and then inserted into the plasmid PGPU6/GFP/Neo to construct recombinant plasmids.After identification by DNA sequencing,the 4 shRNA expression vectors were cotransfected into 293T cells with the Cbl-b gene eukarytic expresson plasmid,respectively.The knockdown efficiency of these shRNA expression plasmids on Cbl-b expression was evaluated by real-time （RT） fluorescence-based quantitative PCR and Western blot at 48 hours aftert transfection.Results Sequencing analysis revealed that all the 4 pairs of shRNAs were successfully inserted into the eukarytic expression vector PGPU6/GFP/Neo.As RT-PCR and Western blot showed,all the 4 shRNA-expressing vectors could downregulate Cbl-b expession,and the NO.1 shRNA-expressing vector displayed the strongest interference effect（P 〈 0.05）.Conclusions A eukaryotic expression plasmid vector was successfully constructed for Cbl-b gene-specific shRNAs,and the most effective shRNA was selected in this study.
出处
《中华皮肤科杂志》
CAS
CSCD
北大核心
2015年第3期204-207,共4页
Chinese Journal of Dermatology
基金
国家自然科学基金面上项目（81171513）
关键词
泛素蛋白连接酶类
RNA
小分子干扰
黑色素瘤
Cbl-b
Ubiquitin-protein ligases
RNA,small interfering
Melanoma
Genes,Cbl-b
