p38对放线菌酮经线粒体途径诱导HL-60细胞死亡的影响

目的研究 p38对放线菌酮(CHX)经线粒体途径诱导 HL-60细胞死亡的影响。方法利用 p38持异性阻断剂 SB203580(SB)阻断 HL-60细胞 p38途径,分别设对照组、单纯 SB 组、CHX组和 CHX 联合 SB 组;于处理6,9,12,18,24 h 利用碘化丙锭(PI)染色流式细胞术检测亚二倍体峰细胞比率;于处理6和18 h 进行膜联蛋白Ⅴ(Annexin Ⅴ)/PI 双标流式细胞术测定凋亡和坏死细胞比率;于处理18 h 利用 JC-1染色流式细胞术分析,通过对 FL2的划分比较不同处理时间高 JC-1集合体量细胞比率;测定细胞 JC-1集合体(FL2)和 JC-1单体(FL1)平均荧光强度,并计算线粒体膜电势(△Ψ_m,FL2/FL1)。结果在 CHX 处理6 h HL-60细胞亚二倍体峰细胞比率显著高于对照组,在此过程中阻断 p38途径则在处理9 h 开始亚二倍体峰细胞比率显著高于 CHX 组。处理18 h 凋亡细胞比率:CHX组[(27.9±0.52)%]和 CHX 联合 SB 组[(28.54±1.38)%]均显著高于对照组[(2.45±0.65)%](P<0.01);CHX 联合 SB 组与 CHX 组比较差异无统计学意义(P>0.05)。处理18 h 坏死细胞比率:CHX 组和 CHX 联合 SB 组均显著高于对照组(P<0.01);CHX 联合 SB 组显著高于 CHX 组(P<0.01)。此外,CHX 组和 CHX 联合 SB 组高 JC-1集合体细胞比率均显著低于对照组(P<0.01),CHX联合 SB 组高 JC-1集合体细胞比率显著低于 CHX 组(P<0.01)。处理18 h 时各实验组△Ψ_m CHX 组(0.17+0.01)和 CHX 联合 SB 组(0.05±0.003)均显著低于对照组(0.38±0.02)(P<0.01),CHX 联合 SB 组△Ψ_m 显著低于 CHX 组(P<0.01)。结论 CHX 可诱导 HL-60细胞凋亡和线粒体去极化,在该过程中阻断 p38途径可使线粒体的去极化作用增强,本模型中 p38途径可能与 HL-60细胞的坏死密切相关。

The effect of p38 on the cycloheximide-induced HL-60 cell death through mitochondria pathway

OBJECTIVE: To study the effect of p38 on the cycloheximide (CHX)-induced HL-60 cell death through mitochondria pathway. METHODS: Inhibition of p38 pathway was by SB203580 (SB). Four groups were set up: control, SB only, CHX only and SB + CHX. Sub-diploid cell ratio was detected by PI staining flow cytometry at 6, 9, 12, 18, 24 h time points, and apoptotic cell ratio by Annexin V-FITC/PI double staining flow cytometry at 6 h and 18 h time points. High J-aggregate cells were evaluated by the J-aggregate contents, measurement of the J-aggregate (FL2) and J-monomer (FL1) by JC-1 flow cytometry, calculation of the delta psi m by FL2/FL1 and analysis of the delta psi m changes at 18 h time points. RESULTS: The sub-diploid cell ratio in CHX group was significantly higher than that in control group at 6 h time point, and the ratio in SB + CHX group was significantly higher than that in CHX group at 9 h time point. At 18 h time point the apoptotic cell ratios in both CHX and SB + CHX groups were significantly higher than those in control group (P < 0.01). There was no significant difference of apoptotic cell ratio between CHX group and SB + CHX group (P > 0.05). At 18 h time point the necrotic cell ratios in both CHX and SB + CHX groups were significantly higher than that in control group (P < 0.01); and that in SB + CHX group was significantly higher than that in CHX group (P < 0.01). The high J-aggregate cell ratios in CHX and SB + CHX groups were significantly lower than that in control group (P < 0.05), and that was signficantly lower in SB + CHX group than in CHX group (P < 0.01). For the FL2/FL1 value (delta psi m) CHX group (0.17 +/- 0.01) and SB + CHX group (0.05 +/- 0.003) were significantly higher than control group (0.38 +/- 0.02) (P < 0.01), and SB + CHX group was significantly lower than CHX group (P < 0.01). CONCLUSION: CHX can induce HL-60 cell apoptosis and the cell mitochondria depolarization, and the latter was intensified by inhibition of the p38 pathway. p38 pathway may related to the cell necrosis in the cycloheximide-induced HL-60 cell apoptosis model. s