目的 探讨miR-155在前列腺癌放射治疗(简称放疗)中的增敏作用。方法 转染anti-miR-155,抑制前列腺癌DU145和PC-3细胞中miR-155水平,联合应用放射治1疗,通过观察DU145和PC-3细胞的存活率、黏附率,以及前列腺癌细胞的凋亡率,并观察Caspase-3和Caspase-9表达水平和活性的变化。结果 与对照组相比,DU145和PC-3细胞经放射或anti-miR-155单独处理后,细胞存活率(放射组分别为25.6%±2.0%和21.6±1.0%;anti-miR-155处理组分别为20.5%±1.0%和15.5%±1.0%)和黏附率(放射组分别为0.8%±0.1%和0.7%±0.1%;anti-miR-155处理组分别为0.7%±0.1%和0.6%±0.1%)均显著降低(P<0.01);前列腺癌细胞凋亡率增高(放射组分别为3.3%±0.3%和4.2%±0.3%;anti-miR-155处理组分别为4.1%±0.1%和3.9%±0.2%);Caspase-3和Caspase-9表达水平和活性均提高(P<0.01);联合组的细胞存活率(分别为10.1%±0.5%和6.1%±0.5%)和黏附率(分别为0.4%±0.1%和0.4%±0.1%)低于单独处理组(P<0.01,n=6),细胞凋亡率(分别为6.9%±0.4%和6.8%±0.3%),Caspase-3和Caspase-9表达水平和活性等均高于单独处理组(P<0.01)。结论 抑制miR-155可增加人前列腺癌的放疗敏感性,提高放射线对人前列腺癌细胞的治疗效果,其机制可能与Caspase-3和Caspase-9参与细胞凋亡的途径相关。
Abstract
Objective To explore the effects of miR-155 on radiosensitivity enhancement of prostate cancer in vitro.Methods Cell viability and adhesion of DU145 and PC-3 cells were evaluated after anti-miR-155 transfection combined with irradiation therapy. Flow cytometry was performed to evaluate the cell apoptosis. The expression and activity of Caspase-3 and Caspase-9 were also observed after the above treatment.Results The results evidenced that cell viability(25.6%±2.0% and 21.6±1.0% in irradiated group;20.5%±1.0% and 15.5%±1.0% in anti-miR-155 transfected group) and adhesion of DU145 and PC-3 cells(0.8%±0.1% and 0.7%±0.1% in irradiated group;0.7%±0.1% and 0.6%±0.1% in anti-miR-155 transfected group) were inhibited obviously after anti-miR-155 transfection. The apoptosis rate(3.3%±0.3% and 4.2%±0.3% in irradiated group;4.1%±0.1% and 3.9%±0.2% in anti-miR-155 transfected group), Caspase-3 and Caspase-9 expression and activity were enhanced obviously compared with the control group(P<0.01).After combinative treatment, cell viability (10.1%±0.5% in irradiated group and 6.1%±0.5% in anti-miR-155 transfected group) and adhesion (0.4%±0.1% in irradiated group and 0.4%±0.1% in anti-miR-155 transfected group)decreased significantly(P<0.01,n=6).The apoptosis rate(6.9%±0.4% in irradiated group;6.8%±0.3% in anti-miR-155 transfected group) and the expression of Caspase-3 and Caspase-9 were also higher than the signal treated group(P<0.01).Conclusions Our results suggested that miR-155 can increase the radiosensitivity of DU145 and PC-3 cells and increase the efficiency of radiotherapy of γ-ray irradiation on prostate cancer in vitro.
关键词
miR-155 /
前列腺癌 /
放疗增敏 /
Caspase-3 /
Caspase-9
Key words
miR-155 /
prostate cancer /
radiosensitivity /
Caspase-3 /
Caspase-9
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