Objective To investigate apoptosis of HepG2 ceils after transfecfion with LIGHT gene and interferon-γ. Methods LIGHT gene and interferon-γ were transfected into HepG2 cells by liposome mediated method. The HepG2 cells were divided into group A (transfected with LIGHT gene or interferon-γ), group B (transfeeted with LIGHT gene and interferon-γ) and group C (non-transfection group). The apoptosis rate of the HepG2 cells and the expression of Bcl-2 and Caspase-8 were detected 12, 24, 48 hours after transfeetion. Results (1) The apoptosis rates of HepG2 cells at hour 12, 24 and 48 after transfeetion were 18.8% ± 3.5%, 25.7%± 2.8% and 36.4% ±3.6% in group A, 23.8% ±2.4%, 31.1% ±2.1% and42.5% ±4.5% in group B, and 8.7% ± 2.1%, 9.3% ± 1.6% and 10.9% ± 1.2% in group C. There was a significant difference in apoptosis rate among the 3 groups (F = 15.69, 53.33, 48.28, P < 0.01). (2) The expression of Bcl-2 in HepG2 cells at hour 12, 24 and 48 after transfection was 16.4% ± 5.0%, 13.4% ± 3.5% and 8.6% ± 2.3% in group A, 14.7%±3.8%, 9.1% ±2.0% and 4.6% ±2.0% in group B, and 25.3% ±6. 3%, 19.8% ±4.4% and 10.1% ±3.8% in group C. There was a significant difference in the expression of Bcl-2 among the 3 groups (F = 6.19, 12.29, 5.81, P <0.05). (3) The expression of Caspase-8 at hour 12, 24 and48 after transfection were 19.3% ±2.4%, 27.2% ±1.9% and 33.7% ±3.0% in group A, 22.7% ±2.2%, 30.9% ±3.1% and 38.2% ±3.2% in group B, and 1.2% ±0.8%, 1.8% ±0.6% and 3.2% ±1.5% in group C. There was a significant difference in the expression of Caspase-8 among the 3 groups (F =71.54, 112. 78, I01.61, P < 0.01). Condusions LIGHT gene can signiticanfly promote cell apoptosis through regulating the expression of Bcl-2 and Caspase-8. Interferon-γ enhanced the effect of LIGHT gene on the apoptosis of HepG2 cells.%目的 探讨脂质体介导LIGHT基因和IFN-γ转染诱导肝癌HepG2细胞的促凋亡作用.方法 以脂质体介导LIGHT基因和IFN-γ转染肝癌HepG2细胞,设立转染组(单转、联合转染组)和对照组(未转染组).分别于转染后12、24、48 h检测肝癌HepG2细胞的凋亡率、Bcl-2及Caspase-8的表达量,并采用方差分析.结果 (1)细胞凋亡率:单转组转染后12、24、48 h为18.8%±3.5%、25.7%±2.8%、36.4%±3.6%;联合转染组为23.8%±2.4%、31.1%±2.1%、42.5%±4.5%;对照组为8.7%±2.1%、9.3%±1.6%、10.9%±1.2%.3组比较差异有统计学意义(F=15.69,53.33,48.28,P<0.01).(2)Bcl-2表达量:单转组在转染后12、24、48 h为16.4%±5.0%、13.4%±3.5%、8.6%±2.3%;联合转染组为14.7%±3.8%、9.1%±2.0%、4.6%±2.0%;对照组为25.3%±6.3%、19.8%±4.4%、10.1%±3.8%.3组比较差异有统计学意义(F=6.19.12.29,5.81,P<0.05).(3)Caspase-8表达量:单转组在转染后12、24、48 h为19.3%±2.4%、27.2%±1.9%、33.7%±3.0%;联合转染组为22.7%±2.2%、30.9%±3.1%、38.2%±3.2%;对照组为1.2%±0.8%、1.8%±0.6%、3.2%±1.5%.3组比较差异有统计学意义(F=71.54,112.78,101.61,P<0.01).结论 LIGHT基因转染肝癌HepG2细胞后通过调节Bcl-2及Caspase-8的表达来发挥促凋亡作用,IFN-γ能增强LIGHT基因诱导肝癌HepG2细胞的凋亡.
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