TG2和Mertk基因共沉默腺病毒干扰载体的构建及其基因沉默作用

目的构建转谷氨酰胺酶2（TG2）和Mer受体酪氨酸激酶（Mertk）基因共沉默腺病毒干扰载体,并检测其基因沉默作用。方法首先构建能干扰TG2和Mertk蛋白表达的质粒载体pSUPER/TG2及pSUPER/Mertk,再将其干扰序列和H1启动子序列切下并连接到pAdTrack上,构建成pAdTrack/TG2/Mertk载体。将其转入含有pAdEasy-1的BJ5183感受态细菌中,回收并酶切鉴定重组腺病毒载体。将阳性腺病毒载体感染HEK293细胞,收集病毒,反复扩增后测定病毒滴度。分别以pAdTrack/TG2/Mertk、pAdTrack/TG2、pAdTrack/Mertk及pAdTrack/绿色荧光蛋白（GFP）感染RAW264.7细胞,采用免疫印迹法检测其TG2蛋白和Mertk蛋白的表达水平。结果pAdTrack/TG2/Mertk载体的病毒滴度为6.13×1010GFU/mL。经酶切鉴定,pAdTrack/TG2/Mertk含有插入的2个启动子和2个干扰序列,载体构建成功。pAdTrack/TG2和pAdTrack/TG2/Mertk组TG2蛋白的表达水平比较差异无统计学意义（P〉0.05）,但均低于pAdTrack/GFP和pAdTrack/Mertk组（P〈0.01）,后两者比较差异无统计学意义（P〉0.05）。pAdTrack/Mertk和pAdTrack/TG2/Mertk组Mertk蛋白的表达水平比较差异无统计学意义（P〉0.05）,但均低于pAdTrack/GFP和pAdTrack/TG2组（P〈0.01）,后两者比较差异无统计学意义（P〉0.05）。结论 TG2和Mertk基因共沉默腺病毒干扰载体pAdTrack/TG2/Mertk构建成功,其能显著降低小鼠巨噬细胞样RAW246.7细胞中TG2蛋白和Mertk蛋白的表达水平。

Construction and Gene Silence Function of Gene Silence Adenovirus Vector Plasmid Targeting Both TG2 and Mertk Synchronously

Objective To construct gene silence adenovirus vector targeting both transglutaminase 2 （TG2） and Mer receptor tyrosine kinase （Mertk） synchronously and detect the gene silence function of it. Methods The interfering plasmids targeting TG2 protein and Mertk protein were constructed firstly, then the H1 promoter and RNA interfering （RNAi） sequence were cut and ligated to pAdTrack for constructing pAdTrack/TG2/Mertk. The pAdTrack/ TG2/Mertk was transfected into B J5183 bacterial cells which contained pAdEasy-1, then the plasmid was detected by enzyme digestion after recovery. Adenovirus were harvested after that pAdTrack/TG2/Mertk was infected into HEK293 cells. The virus titer was measured after repeated amplification. The RAW264. 7 cells were infected by pAdTrack/TG2/ Mertk, pAdTrack/TG2, pAdTrack/Mertk, and pAdTrack/green fluorescent protein （GFP）, respectively. Then the expression levels of TG2 protein and Mertk protein of mouse macrophages were detected by Western blot after infection. Results The virus titer of pAdTrack/TG2/Mertk plasmid was 6.13 x 101~ GFU/mL. The pAdTrack/TG2/Mertk plasmid which contained 2 promoters and 2 RNAi sequences was identified successfully by enzyme digestion. Compared with pAdTrack/GFP group and pAdTrack/Mertk group （there was no significant differece between the 2 groups）, the expression levels of TG2 protein of mouse macrophages which infected with pAdTrack/TG2/Mertk or pAdTrack/ TG2 decreased obviously （P 〈 0. 01）, but there was no significant difference between the later 2 groups. Compared with pAdTrack/GFP group and pAdTrack/TG2 group （there was no significant difference between the 2 groups）, the expression levels of Mertk protein of mouse macrophages which infected with pAdTrack/TG2/Mertk or pAdTrack/Mertk decreased obviously too （P〈0. 01）, but there was no significant difference between the later 2 groups. Conclusion Gene silence adenovirus vector plasmid targeting both TG2 and Mertk synchronously is constructed successfully, and the pAdTrack/TG2/Mertk can reduce the expressions of TG2 protein and Mertk protein of mouse macrophages obviously.