Inhibitory effect of parvovirus H-1 on the formation of colonies of human hepatoma cell line in vitro and its tumors in nude mice

The inhibitory effect of parvovirus H-1 on the colonyforming ability in vitro of QGY-7703, a cultured human hepatoma cell line, and on the formation and growth of its tumors in nude mice was studied. With higher multiplicity of infection (MOI) of H-1 given, survival of the QGY-7703 cells was found to be decreased. H-1 DNA amplification level at 30 h postinfection(p.i.) was detected to be 7.4 times higher than that at 2 h by dispersed cells assay, while the cells were delayed to enter into S phase.Plaques were formed in the indicator cells (new-born human kidney cell line, NBK) by progeny H-1 virus particles released from the infected QGY-7703 cells by infectious cell center assay. The formation of tumors in nude mice by QGY-7703 cells which were injected s c at 2 h postinfection was observed to be prevented in 2 groups with given MOI 25 and 50. The tumor growth of MOI 10 group occurred at a lower exponential rate than that of control,after a 20 d latent period. It was evident that parvovirus H-1 exhibited a direct inhibitory effect on the formation and growth of human hepatoma cells in vivo as well as in vitro.

单抗C225致人肺鳞癌H-520细胞生长抑制和凋亡增加的研究

目的:观察表皮生长因子受体单克隆抗体C225对人肺鳞癌细胞系(H-520)生长、凋亡和周期分布的影响。方法:流式细胞检测H-520细胞EGFR表达比例,将鼠抗人EGFR一抗和FITC标记的羊抗鼠二抗加入细胞悬液中,孵育、漂洗重悬细胞后流式检测。MTT法测定C225抑制H-520细胞生长最佳浓度和最佳时间,将不同浓度C225加入指数生长的细胞培养液中,继续培养一定时间(48h),检测细胞生长抑制率。流式细胞仪检测细胞凋亡以及细胞周期。结果:H-520细胞中EGFR表达比例高达82.25%。C225抑制H-520细胞生长的最佳浓度是40nmol/L,最佳作用时间是72h。细胞凋亡实验结果显示,H-520细胞自然凋亡率为5.56%±0.62%,C225可使其凋亡百分率上升到13.75%±0.83%(P<0.05)。细胞周期分布显示40nmol/L C225可使细胞阻滞于G0+G1期,S期细胞比例下降。结论:C225对H-520细胞生长抑制作用,可能与细胞G0+G1期阻滞后凋亡有关。