三氧化二砷对HL-60细胞凋亡及其端粒酶hTERT-mRNA表达影响的实验研究

目的　探讨不同浓度的三氧化二砷 (As2 O3)对急性早幼粒细胞白血病细胞株HL 60细胞端粒酶亚单位hTERT mRNA表达及其诱导凋亡的作用。方法　不同浓度的As2 O3与HL 60细胞株共培养 48h ,流式细胞术鉴定HL 60细胞凋亡 ;RT PCR法检测HL 60细胞端粒酶亚单位hTERTmRNA的表达。结果　在 0 1、1 0和 5 0 μmol·L-13种浓度的As2 O3作用下 ,HL 60细胞凋亡率分别为 2 2 8%± 0 40 %、2 5 5 %± 0 2 2 %和 47 5 7%± 2 79% ;端粒酶亚单位hTERT mRNA表达的相对值分别为 73 97%、63 70 %和 2 9 0 4%。细胞凋亡率在 5 0 μmol·L-1与 0 1和 1 0μmol·L-1浓度组间差异有显著性 (P <0 0 1) ;端粒酶亚单位表达的差异也有显著性 (P <0 0 5 )。As2 O3诱导HL 60细胞凋亡效应与其抑制端粒酶亚单位hTERTmRNA的表达相关。结论　As2 O3对HL 60细胞具有凋亡诱导效应 ,且对其端粒酶亚单位hTERTmRNA的表达具有抑制作用 ,两者均呈现浓度依赖效应。As2 O3可能通过抑制HL 60细胞端粒酶亚单位hTERTmRNA的表达而诱导肿瘤细胞凋亡

The experimental studies of the effects of As2O3 on the expression of telomerase hTERT-mRNA and apoptosis of HL-60 cells

AIM To investigate the effects of apoptosis and the expression of telomerase hTERT mRNA activity of HL-60 cells treated with As 2O 3 in different concentrations. METHODS HL-60 cells was cultured with As 2O 3 in different concentrations for 48 hours, then, cell apoptosis was detected with flow cytometry and the expression of telomerase hTERT mRNA was determined with RT-PCR respectively. RESULTS The percentage of the apoptosis in HL-60 cells were 2 28%±0 40%?2 55%±0 22% and 47 57%±2 79% respectively, as the cells were treated with 0 1 μmol·L -1,1 0 μmol·L -1,5 0 μmol·L -1 As 2O 3 for 48 hours. The difference was significant between 5 0 μmol·L -1 and 0 1～1 0 μmol·L -1 groups(P<0 01). The relative value of hTERT mRNA expression was 73 97%?63 70% and 29 04%,respectively, and the difference was significant too(P<0 05). CONCLUSION As 2O 3 may induces the apoptosis of HL-60 cells by selectively inhibits the expression of telomerase hTERT- mRNA.