大鼠永生化神经前体细胞CDH1小干扰RNA真核载体的构建

目的 构建大鼠永生化神经前体细胞(INPC)CDH1小干扰RNA(siRNA)真核载体.方法 根据大鼠CDH1基因的编码序列设计3个小发夹RNA(shRNA)干扰序列及1个阴性对照序列,根据pENTR/H1/TO中间载体说明书设计并合成相应的DNA单链,退火后分别连接到pENTR/H1/TO线性载体上,形成完整载体,提取CDH1 siRNA真核载体后(分别为CDH1 siRNA1、CDH1 siRNA2、CDH1siRNA3和CDH1 siRNA对照),进行DNA测序鉴定.采用Lipofectamine 2000法,分别将成功构建的CDH1siRNA真核载体转染大鼠INPC,于转染24 h和48 h时计算INPC转染效率=INPC成功转染数/细胞总数,于转染48 h时提取细胞总RNA,采用实时定量PCR法检测INPC CDH1 mRNA的表达.结果 经DNA测序鉴定构建的3个CDH1 siRNA真核载体和1个阴性对照载体所插入的RNA干扰序列均正确,无碱基突变或缺失;INPC转染24 h与48 h时转染效率分别为(54±5)%和(36±4)%;CDH1 siRNA2转染INPC 48 h时INPC CDH1 mRNA表达水平较CDH1 siRNA3降低,且两者均低于CDH1 siRNA1(P<0.05).结论 本研究成功构建大鼠INPC CDH1 siRNA真核载体.

Construction of CDH1 small interfering RNA enkaryotic vector ha rat immortalized neural progenitor cell and screening of the effective target site

Objective To construct CDHI small interfering RNA eukaryofic vector in rat immortalized neural progenitor cell (INPC) and screen the effective target site. Methods Three hands of interfering sequences and one control sequence for CDHI small hairpin RNA were designed based on CDO1 coding sequence. Following the instructions on pENTR/H1/TO vector, the oligonuclcotides were synthesized, annealed and ligated into linearized pENTR/HI/TO vector, respectively. After confirmation by DNA sequencing, positive recombinant plasmids(CDO1 siRNAt, CDH1 siRNKz , CDH1 siRNA3 and CDH1 siRNA,)were transfected into INPCs respectively by the lipesome method. The pEGFP plasmid was transfected to evaluate the efficiency of transfection. Forty eight hours after transfection, total cellular RNA was extracted and the expression of CDH1 was analyzed by BT-PCR. Results The three eukaryotic vectors for CDHI siRNA and one control vector were successfully constructed and identified with DNA sequencing. The efficiency of cell transfection was (54 :t: 5) % at 24 h after transfection, (36 + 4) % at 48 h after transfection. The expression of CDH1 mRNA in INPC trandected with CDHI siRNA2 was lower than that of CDHI mRNA in INPC transfected with CDH1 siRNA～, and both the expression was lower than that of CDHI mRNA in INPC transfected with CDH1 siRNAs at 48 h after tmnsfectlon. Conclusion The effective small interfering RNA eukaryotic vector for CDH1 in INPC was successfully constructed and screened.