Abstract
In leukemia cells, hyperthermia enhances tumor necrosis factor-related apoptosis-inducing ligand (TRAIL)-induced apoptosis. The phenomenon is caspase-dependent and results in membrane changes leading to an increased recognition of TRAIL death receptors by TRAIL. Because either caspase-2 or an apical proteolytic event has been recently proposed to act as an initiator of the cell death mechanism induced by heat shock, we have investigated the hierarchy of caspase activation in cells exposed to the combined heat shock plus TRAIL treatment. We report here that caspases-2, -3, and -8 were the first caspases to be activated. As expected, caspase-8 is required and indispensable during the initiation of this death signaling. Caspase-2 may also participate in the phenomenon but, in contrast to caspase-8, its presence appears dispensable because its depletion by small interfering RNA is devoid of effects. Our observations also suggest a role of caspase-3 and of a particular cleaved form of this caspase during the early signals of heat shock plus TRAIL-induced apoptosis.
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Abbreviations
- TRAIL:
-
TNF-related apoptosis-inducing ligand
- FADD:
-
Fas-associated death domain
- DISC:
-
death signaling inducing complex
- FlipL:
-
long forms of FADD-like ICE inhibitory protein
- TNF:
-
tumor necrosis factor
- Hsp:
-
heat shock protein
- HS:
-
heat shock
- PI:
-
propidium iodide
- siNS:
-
siRNA nonsilencing sequence
- z-VAD-fmk:
-
z-Val-Ala-Asp-fluoromethylketone
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Acknowledgments
We would like to thank Dominique Guillet for excellent technical assistance. We wish to thank Dr. Delphine Cuchet (Lyon, France) for helpful advice with the siRNA experiments and for providing control sequence (siNS).
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Grant support: The Région Rhône-Alpes (Thématique Prioritaire Cancer and Cible 06).
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Moulin, M., Arrigo, AP. Caspases activation in hyperthermia-induced stimulation of TRAIL apoptosis. Cell Stress and Chaperones 13, 313–326 (2008). https://doi.org/10.1007/s12192-008-0027-3
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DOI: https://doi.org/10.1007/s12192-008-0027-3