Abstract
Caspase 8 is the most proximal caspase in the caspase cascade and has been known for its role in the mediation of cell death by various death receptors belonging to the TNFR family. We have discovered that Caspase 8 can activate the NF-κB pathway independent of its activity as a pro-apoptotic protease. This property is localized to its N-terminal prodomain, which contains two homologous death effector domains (DEDs). Caspase 10 and MRIT, two DEDs-containing homologs of Caspase 8, can similarly activate the NF-κB pathway. Dominant-negative mutants of the Caspase 8 prodomain can block NF-κB induced by Caspase 8, FADD and several death receptors belonging to the TNFR family. Caspase 8 can interact with multiple proteins known to be involved in the activation of the NF-κB pathway, including the serine-threonine kinases RIP, NIK, IKK1 and IKK2. Thus, DEDs-containing caspases and caspase homolog(s) may have functions beyond their known role in the mediation of cell death.
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Acknowledgements
We would like to thank Drs Emad Alnemri, Vishva Dixit, David Han and Michael Wright for the CrmA, FADD and various caspase expression plasmids, Dr Edward Clark for the NF-κB reporter plasmid, Dr Hiroyasu Nakano for IKKs expression plasmids and Dr Gioacchino Natoli for NIK expression plasmids. PMC was supported by a postdoctoral fellowship from the Cancer Research Fund of the Damon Runyon-Walter Winchell Foundation.
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Chaudhary, P., Eby, M., Jasmin, A. et al. Activation of the NF-κB pathway by Caspase 8 and its homologs. Oncogene 19, 4451–4460 (2000). https://doi.org/10.1038/sj.onc.1203812
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DOI: https://doi.org/10.1038/sj.onc.1203812
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