摘要:
目的:研究γ-生育三烯酚联合亚砷酸对急性早幼粒细胞NB4生长的抑制作用及可能的分子机制.方法:采用CCK-8、细胞周期实验检测细胞增殖、利用激光共聚焦显微镜、Annexin V/PI染色、Caspase活性检测、Western Blot等方法测定细胞凋亡.采用1 μmol/L ATO及不同浓度(0、15、30、45 μmol/L)的γ-生育三烯酚处理NB4细胞24、48和72小时,通过CCK-8检测细胞的增殖情况,流式细胞术、激光共聚焦显微镜检测细胞周期和凋亡情况,检测Caspase3,8,9的活性,Western Blot检测细胞中c-cas-pase-3、Bcl-2和survivin的蛋白表达.结果:γ-生育三烯酚联合亚砷酸显著抑制NB4细胞增殖(P<0.01),且随着作用时间延长和γ-生育三烯酚浓度的增加,其增殖抑制作用增强;细胞周期阻滞在S期,S期的比例由38.21%± 2.99上升到50.31%± 5.03;γ-生育三烯酚联合亚砷酸诱导NB4细胞凋亡,1μmol/L ATO联合15、30 μmol/L的γ-生育三烯酚处理48h后,细胞活率分别为82.27%±3.16、66.97%±3.17、12.63%±2.66;1 μmol/L ATO联合30 μmoi/L的γ-生育三烯酚处理后,NB4细胞caspase-3,-8,-9的活性均较ATO单独用药组显著增高,c-caspase-3表达增高而Bcl-2和survivin蛋白的表达无明显变化.结论:生育三烯酚联合亚砷酸对急性早幼粒细胞NB4的生长具有抑制作用,此作用可能与抑制增殖并诱导凋亡相关,其作用靶点可能与促进Cas-pase诱导的凋亡有关.%Objective:To evaluate the inhibitory effect and possible mechanism of γ-tocotrienol in combination with ATO on the acute promyelocytic leukimia cell line NB4.Methods:NB4 cells were treated with 1 μmol/L ATO in combination with different concentrations of γ-tocotrienol (15,30and45 μmol/L) for 24,48,72h respectively.The proliferation of NB4 cells were tested by CCK-8 assay.Flow cytometry and Confocal microscopy were used to evaluate the cell cycle and apoptosis of γ-tocotrienol in combination with ATO on NB4 cells.The activity of Caspase3,8,9 and the protein expression of c-caspase-3,Bcl-2 and survivin were evaluated by Western Blot.Results:ATO in combination with different concentrations of γ-tocotrienol significantly suppressed proliferation on NB4 cells.The cell cycle arrested at the S phase,The proportion at the S phase from 38.21%± 2.99 to 50.3 1%± 5.03 compared with 1 μmol/L ATO treated cells.Various apoptotic assessment assays have shown that combination of ATO and γ-tocotrienol significantly induced apoptosis in a dose-dependent manner in NB4 cells.The cell viability was 82.27%± 3.16,66.97%± 3.17,12.63%± 2.66 in NB4 cells treated with 1 μmol/L ATO and in combination with 15,30 μmol/L γ-tocotrienol for 48 h,respectively.In addition,caspase activity assay and western blot have shown that ATO + γ-tocotrienol induced apoptosis in NB4 cells by activation of caspase-3,-8,and-9.However,γ-tocotrienol had no significant effect on Bcl-2 and survivin expression.Conclusion:These data suggest that γ-tocotrienol as a poten-tial,new support treatment for the APL patients.Moreover,caspase-3 could be a promising target for γ-tocotrienol in an effective method of chemoprevention and chemotherapy in APL patients.