慢病毒载体介导RNA结合蛋白-5对肺腺癌细胞系H1299的增殖和凋亡的影响

目的 探讨慢病毒载体介导RNA结合蛋白-5（QKI-5）对肺腺癌细胞凋亡的影响。方法 应用GV358（过表达）和GV248（抑制表达）载体分别构建针对QKI-5基因的慢病毒过表达载体和抑制表达载体，转染293T细胞产生慢病毒颗粒，收集并测定慢病毒滴度。将经测序鉴定的QKI-5过表达的慢病毒或抑制表达的慢病毒转染到肺腺癌细胞H1299，Real-time PCR检测QKI-5 mRNA表达，集落形成实验检测H1299细胞增殖情况，膜联蛋白V（annexin V）、碘化丙啶（PI）检测H1299细胞凋亡情况，Western blotting检测促凋亡蛋白Caspase-3和Caspase-8表达。结果 成功构建QKI-5过表达慢病毒载体和抑制表达慢病毒载体，与对照组比较，QKI-5过表达后，QKI-5 mRNA表达增加，细胞集落形成减少，肺腺癌细胞早期凋亡增加，促凋亡蛋白Caspase-8表达增加；QKI-5抑制表达后，QKI-5 mRNA表达降低，细胞集落形成增加，但肺腺癌细胞凋亡无明显变化，然而促凋亡蛋白Caspase-8表达减少。结论 慢病毒介导 QKI-5抑制增殖，可能通过Caspase-8促进肺腺癌细胞系H1299的凋亡。

Effect of lentiviral vector mediated RNA binding protein quaking-5 on the proliferation and apoptosis of lung adenocarcinoma cell line H1299

To investigate the proliferation and apoptosis of lung adenocarcinoma cells line H1299 by the lentiviral vector mediated RNA binding protein quaking-5( QKI-5). Methods GV358( up-regulation) and GV248( downregulation) vectors were used to construct the lentiviral QKI-5 up-regulation vector and down-regulation vector,respectively. The vectors were transfected into 293 T cells for lentiviral packaging and viral titer were then determined. Gene sequencing was performed to screen the sequence of vectors. Then Real-time PCR was used to evaluate the expression of QKI-5 mRNA and the proliferation of H1299 cells was examined by colony forming assay after transfection. The apoptosis of H1299 cells was determined by the detection of the expression membrane protein Ⅴ( annexin Ⅴ) and propyl iodide ingot( PI) by flow cytometry. Pro-apoptotic protein Caspae-3 and Caspase-8 were evaluated by Western blotting. Results QKI-5 up-regulation and down-regulation lentiviral vectors were constructed successfully. Compared with the controls,the expression of QKI-5 mRNA of H1299 cells was up-regulated,the cell colony formation was decreased,and the early apoptosis of H1299 cells was increased with the over-expression of Caspase-8 after transfected with up-regulated vector,whereas transfecting with QKI-5 down-regulated vector had opposite effect. Conclusion Lenviral vector mediated QKI-5 could inhibit proliferation and promote apoptosis of lung adenocarcinoma cells through Caspase-8.