携带反义热休克蛋白70抑制人喉癌细胞的生长

目的 构建携带反义热休克蛋白70(HSP70)的重组腺病毒载体以用于喉癌的基因治疗研究.方法 将HSP70基因片段反向克隆到腺病毒载体质粒PAdTrack-CMV上,与骨架质粒在大肠杆菌Bj5183胞内进行同源重组,经293细胞包装、扩增后得到携带反义HSP70的重组腺病毒AdEasy-GFP-ASHSP70.结果 成功的构建携带反义HSP70的重组腺病毒载体系统,经测病毒滴度可达8×109.HSP70反义RNA阻断了Hep-2细胞的HSP70的表达,经Western blotting和免疫组化证实,实验组瘤细胞不能表达或低表达HSP70,而对照和空载体组高表达HSP70.转染反义HSP70的腺病毒载体的Hep-2细胞比空载体组和对照组的细胞生长缓慢,细胞周期可见实验组出现亚二倍凋亡峰,而空载体组没有.结论 构建的重组腺病毒AdEasy-GFP-ASHSP70可望有效地将反义HSP70导入人喉癌细胞株,为进一步研究喉癌基因治疗提供实验基础.

Adenovirus-mediated antisense HSP70 cDNA transfection inhibits the growth of laryngeal carcinoma Hep-2 cells

OBJECTIVE: To construct a recombinant adenovirus vector carrying antisense heat shock protein 70 (HSP70) cDNA and observe its effect on inhibiting the growth of laryngeal carcinoma Hep-2 cells. METHODS: The HSP70 gene fragment encoding the 5' region was cloned reversely into the shuttle plasmid PAdTrack-CMV, and the resultant plasmid was recombined with the backbone plasmid PadEasy-1 in the E.coli Bj5183 cells to generate the recombinant adenovirus vector. The adenovirus were then packaged and amplified in 293 cells, and the viral titer was determined using GFP. RESULTS: The recombinant adenovirus vector carrying antisense HSP70 cDNA was constructed successfully with a viral titer of 8 x 10(9). HSP70 expression of Hep-2 cells was obviously blocked by antisense HSP70 RNA, and Western blotting and immuohistochemistry demonstrated that cells transfected with antisense HSP70 did not express or express HSP70 at low levels. Flow cytometry presented apoptotic peak in the antisense HSP70-transfected cells, but not in the control cells. CONCLUSION: The recombinant adenovirus vector containing antisense HSP70 cDNA can effectively deliver antisense HSP70 gene into Hep-2 cells, suggesting the great potential of this gene therapy strategy in management of human laryngeal carcinoma.