1. Caspase-3 Protects Stressed Organs against Cell Death
- Author
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Gilles Dubuis, Christian Widmann, Nieves Peltzer, Noémie Gardiol, Paul L. Bigliardi, Hadi Khalil, Benjamin J. Marsland, Joël Walicki, Jiang Yan Yang, Werner Held, and Lucas Liaudet
- Subjects
Programmed cell death ,Ultraviolet Rays ,Molecular Sequence Data ,Sunburn ,P120 GTPase Activating Protein ,Caspase 3 ,Cell fate determination ,Mice ,03 medical and health sciences ,Stress, Physiological ,Animals ,Enzyme Inhibitors ,Molecular Biology ,Protein kinase B ,Caspase ,030304 developmental biology ,Mice, Knockout ,0303 health sciences ,Base Sequence ,Cell Death ,biology ,Dextran Sulfate ,030302 biochemistry & molecular biology ,Hemodynamics ,p120 GTPase Activating Protein ,Articles ,Cell Biology ,Colitis ,3. Good health ,Cell biology ,Enzyme Activation ,Gene Expression Regulation ,Doxorubicin ,Apoptosis ,Mutation ,Immunology ,biology.protein ,Signal transduction ,Cardiomyopathies ,Proto-Oncogene Proteins c-akt ,Signal Transduction - Abstract
The ability to generate appropriate defense responses is crucial for the survival of an organism exposed to pathogenesis-inducing insults. However, the mechanisms that allow tissues and organs to cope with such stresses are poorly understood. Here we show that caspase-3-knockout mice or caspase inhibitor-treated mice were defective in activating the antiapoptotic Akt kinase in response to various chemical and environmental stresses causing sunburns, cardiomyopathy, or colitis. Defective Akt activation in caspase-3-knockout mice was accompanied by increased cell death and impaired survival in some cases. Mice homozygous for a mutation in RasGAP that prevents its cleavage by caspase-3 exhibited a similar defect in Akt activation, leading to increased apoptosis in stressed organs, marked deterioration of their physiological functions, and stronger disease development. Our results provide evidence for the relevance of caspase-3 as a stress intensity sensor that controls cell fate by either initiating a RasGAP cleavage-dependent cell resistance program or a cell suicide response.
- Published
- 2012
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