CD95-mediated alteration in Hsp70 levels is dependent on protein stabilization

被引:9
作者
Concannon, CG
FitzGerald, U
Holmberg, CI
Szegezdi, E
Sistonen, L
Samali, A [1 ]
机构
[1] Natl Univ Ireland Univ Coll Galway, Cell Stress & Apoptosis Res Grp, Dept Biochem, Galway, Ireland
[2] Natl Univ Ireland Univ Coll Galway, Natl Ctr Biomed Engn Sci, Galway, Ireland
[3] Abo Akad Univ, Univ Turku, Turku Ctr Biotechnol, FIN-20521 Turku, Finland
关键词
D O I
10.1379/CSC-69R.1
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Engagement of death receptors induces caspase activation and apoptosis. A recent study reported altered protein expression, including increased Hsp70 levels during CD95-mediated apoptosis. Here, we examined the mechanism underlying increased Hsp70 levels in cells challenged with a monoclonal antibody directed against the CD95 receptor. Levels of Hsp70 were found to increase in a dose-dependent manner, occurring independently of either heat shock factor 1 activation or the accumulation of Hsp70 messenger ribonucleic acid (mRNA), suggesting the involvement of posttranslational modifications. Inhibition of translation and de novo protein synthesis by cycloheximide resulted in Hsp70 protein levels diminishing over time in control cells, whereas its level remained constant during CD95 signaling. In addition, death receptor activation through exposure of cells to tumor necrosis factor-related apoptosis-inducing ligand did not alter Hsp70 levels. These findings demonstrate that receptor-specific Signaling through the CD95 increases the stability of Hsp70 protein, rather than mRNA, when compared with control cells. The results describe a novel mechanism of heat shock protein accumulation, where increased protein stability and reduced turnover, is the mechanism by which Hsp70 accumulates in cells during CD95-mediated apoptosis.
引用
收藏
页码:59 / 65
页数:7
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