The anti-tumor effect by adenovirus-mediated ING4 and IL-24 co-expression on hepatocellular carcinoma in vitro / 中华微生物学和免疫学杂志

ABSTRACT

Objective To construct a recombinant adenoviral vector carrying and co-expressing human inhibitor of growth 4(ING4) and human interleukin-24(IL-24) mediated by poly( A)-Promoter[Ad-ING4-poly(A)-Promoter-IL-24, referred to as Ad-ING4-IL-24] and explore its effect on the growth of HepG-2 human hepatocellular carcinoma cellsin vitro. Methods The poly(A)-Promoter(hEFl-elF4g) (Sal Ⅰ and Not Ⅰ ), ING4 ( Bgl Ⅱ and Sal Ⅰ ), and IL-24 ( Xho Ⅰ and Xba Ⅰ ) fragments were amplified by PCRusing pORF-mbcl-2α, pcDNA3.0-IL-24, and pcDNA3.0-ING4 plasmids as templates and subcloned into pAdTrack-CMV transfer vector to form pAdTrack-CMV-ING4-poly (A)-Promoter-lL-24, respectively. The pAdTrack-CMV-ING4-poly (A)-Promoter-IL-24 transfer vector linearized with Pme Ⅰ digestion and pAdEasy-1 backbone vector was further cotransformed into the bacteria BJ5183 competent cells for homologous recombination. The resultant pAdEasy-l-pAdTrack-CMV-ING4-poly ( A )-Promoter-IL-24 homologous recombinant plasmids were linearized with Pac Ⅰ digestion and transfected into the human embryonic kidney 293 (QBI-293A) cells by liposome, leading to formation of the recombinant adenoviruses Ad-ING4-IL-24co-expressing ING4 and IL-24. The Ad-ING4-IL-24 were amplified in QBI-293A cells and its titer was up to 3.5 × 109 PFU/ml. Adenovirus-mediated ING4 and IL-24 genes expression in HepG-2 cells was examined by RT-PCR and Western blot. The growth-suppressing and apoptosis-inducingg effect of Ad-ING4-IL-24 coexpressing ING4 and IL-24 on HepG-2 human hepatocellular carcinoma cells was assessed by MTT assay and FCM, respectively. Results DNA sequencing showed that the ING4, poly (A)-Promoter, and IL-24 fragments subcloned into pAdTrack-CMV plasmids were completely identical to those reported in GenBank.ING4 and IL-24 gene mediated by adenovirus could both successfully express in HepG-2 cells. Adenovirusmediated ING4 and IL-24 co-expression significantly suppressed HepG-2 hepatocellular carcinoma cell growth and induced cell apoptosis, and the effect of Ad-ING4-IL-24 group was more significant than AdING4 and Ad-IL-24 group. Conclusion The adenoviral vector co-expressing ING4 and IL-24 mediated by poly(A)-Promoter(Ad-ING4-IL-24) was successfully constructed. Ad-ING4-IL-24 had marked anti-tumor effect in suppressing HepG-2 human hepatocellular carcinoma cell growth and inducing cell apoptosis in vitro. Compared with Ad-ING4 and Ad- IL-24, Ad-ING4-IL-24 enhanced anti-tumor effect.