大鼠VGLUT2基因shRNA慢病毒载体的构建和鉴定

目的:构建可以表达针对2型囊泡膜谷氨酸转运体(VGLUT2)shRNA的慢病毒载体,特异性下调中枢神经系统内VGLUT2的表达,从而为研究VGLUT1和VGLUT2的功能差异提供有力的工具。方法:首先在体外合成四对互补并靶向作用于编码大鼠VGLUT2序列四个位点的特异性短发卡RNA(short hairpin RNA)序列和一个阴性对照的寡核苷酸,克隆到pGCSIL-GFP质粒(经Age I和EcoRI双酶切)载体内,经酶切及测序鉴定正确后,将该质粒与辅助质粒pHelper1.0以及pHelper2.0共转染T293细胞,包装得到病毒颗粒。各组病毒载体转染原代培养的大鼠皮层神经元后,运用免疫荧光和Western Blot检测各组蛋白的表达水平。结果:pGCSIL-GFP质粒克隆得到的VGLUT2 shRNA序列正确,包装得到的病毒可以有效转染原代培养的皮层神经元,Western Blot检测结果显示:VGLUT2 shRNA-1与VGLUT2 shRNA-2病毒组的VGLUT2表达水平与空白组相比有显著性差异(P<0.05),分别为空白组的63.9±5.82%,73.8±3.18%;VGLUT2 shRNA-3与VGLUT2 shRNA-4病毒组的VGLUT2表达水平与空白组相比同样有显著性差异(P<0.05),分别为空白组的39.1±1.99%,35.1±1.72%;VGLUT2shRNA-1与VGLUT2 shRNA-2病毒组相比无显著性差异(P>0.05);但VGLUT2 shRNA-3与VGLUT2 shRNA-4病毒组与VGLUT2 shRNA-1和VGLUT2 shRNA-2病毒组相比有显著性差异(P<0.05)。表明VGLUT2 shRNA-3与VGLUT2 shRNA-4组病毒能较为高效的下调培养的皮层神经元VGLUT2的表达,下调效率超过60%。结论:本研究成功构建出表达针对大鼠VGLUT2基因shRNA的慢病毒载体,并可有效下调VGLUT2的表达,为进一步研究VGLUT2的功能及其与VGLUT1之间的功能差异提供了有力的工具。

The construction and identifying of lentiviral vectors that express shRNA targeting VGLUT2 gene of rats

Objective: To construct the lentiviral vectors which express the shRNA targeting the vesicular glutamate transporter 2(VGLUT2)and specifically down-regulate the expression of VGLUT2 in the central nervous system,for obtaining the powerful tool to explore the functional difference of the VGLUT1 and VGLUT2.Methods: Four pairs of specific shRNA sequences which target the four sites of VGLUT2 coding sequences and one pair of negative control oligonucleotide sequence were cloned into the pGCSIL-GFP plasmid(restr...