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特异性阻断剂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(AnnexinV)/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(△ψm,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△ψmCHX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△ψm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.
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 〈 O. 05 ), aud that was signicautly lower in SB + CHX group than in CHX group( P〈0. 01), For the FL2/FL1, lvalue(AtOm) 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 (:ell necrosis in the cycloheximide-indueed HL-60 cell apoptosis model.