Effect of irradiation-induced pcDNA3.1-Egr.1p-p16 on cell apoptosis and cell cycle of JF305 cells / 南方医科大学学报

ABSTRACT

<p><b>OBJECTIVE</b>To observe the effect of pcDNA3.1-Egr.1p-p16 plasmid on apoptosis and cell cycle of pancreatic carcinoma JF305 cell line.</p><p><b>METHODS</b>JF305 cells were cultured and transfected with pcDNA3.1-Egr.1p-p16 plasmid via Lipofectamine(TM) 2000, followed by irradiation by 6MV-X at 4 Gy (dose rate 2.50 Gy/min). The cell cycle and cell apoptosis changes were analyzed by flow cytometry.</p><p><b>RESULTS</b>In cells infected with pcDNA3.1-Egr.1p-p16 plasmid and those with pcDNA3.1-Egr.1p-p16 plasmid infection before 4 Gy irradiation, the percentages of viable apoptotic cells were 6.4% and 10.4%, and those of advanced stage apoptotic or dead cells were 16.8% and 33.8%, significantly higher than those in the control group (P<0.05). JF305 cell apoptosis in 4 Gy irradiation group was obviously increased in comparison with non-irradiated plasmid-infected cells (P<0.05). Irradiation resulted in a predominant G(2) arrest of the plasmid-infected JF305 cells. Both pcDNA3.1-p16 plasmid and pcDNA3.1-Egr.1p-p16 plasmid infections could induce G1 arrest of JF-305 cells, and irradiation did not produce significant changes in G(1)-arrested cells in the two plasmid infection groups, but cells arresting at G(2) phase increased.</p><p><b>CONCLUSION</b>pcDNA3.1-Egr.1p-p16 can induce JF-305 cells apoptosis, which is enhanced by irradiation. pcDNA3.1-Egr.1p-p16 tranfection may result in G(1) arrest of the cells, and when combined with irradiation, the cells arrested at G(2) phase can increase.</p>