铈诱导细胞凋亡过程中O2-·对ERK-like激酶的调控

被引:2
作者
杨松
葛志强
元英进
机构
[1] 天津大学化工学院制药工程系
关键词
铈; ERK-like激酶; 超氧阴离子; 凋亡; 东北红豆杉细胞;
D O I
暂无
中图分类号
Q942 [植物细胞学];
学科分类号
071009 ;
摘要
对1mmol·L-1Ce4+诱导东北红豆杉细胞凋亡中ERKlike和O-2·的变化规律及其信号调控进行了分析和研究.结果表明,一相对分子质量约为46×103的ERKlike激酶在诱导5min时被快速激活,60min时达到对照水平的2.1倍,并在120min内持续激活,诱导240min后ERKlike下调到对照水平的43%,到48h下调到对照的25%.Ce4+诱导O-2·迅速产生,并有两次迸发峰分别出现在3.7~4h和7h.在Ce4+诱导前2h分别加入5μmol·L-1和10μmol·L-1DPI有效抑制了O-2·迸发,并且显著提高和延长了ERKlike磷酸化水平,诱导60min时ERKlike达到对照水平的7.3和18.8倍,240min时达到对照的9.6和10.5倍.这些结果揭示ERKlike的激活和O-2·迸发在诱导早期应是相互独立的信号事件,诱导约4h后O-2·大量迸发对ERKlike的激活有明显信号负调控作用,并通过ERKlike的下调介导了凋亡信号传递.
引用
收藏
页码:902 / 907
页数:6
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