Abstract
The transcription factor NF-κB is a positive transcription factor for a number of genes and has been recognized as an anti-apoptotic regulator. However, the mechanism by which NF-κB blocks apoptosis is still controversial. Here, we demonstrate the evidence that NF-κB could attenuate the TNF-α-induced apoptosis without de novo protein synthesis using human pancreatic cancer cell lines, MIA PaCa-2 and Capan-2. The TNF-α-induced apoptosis was blocked by IL-1β, a potent inducer of NF-κB activation. This inhibitory effect of IL-1β was evident when cells were treated with protein synthesis inhibitors such as cycloheximide (CHX). Moreover, NF-κB decoy oligonucleotides could not block the anti-apoptotic effect of IL-1β at doses sufficient to block the NF-κB-dependent transcription induced by IL-1β. To confirm the role of NF-κB in blocking apoptosis, we generated stable cell lines expressing IκBΔN, a highly stable form of IκBα, a cytoplasmic inhibitor of NF-κB. In these stable transfectants, the anti-apoptotic effect of IL-1β was totally abolished, indicating that the anti-apoptotic action of IL-1β could be ascribed to the NF-κB action. These findings show that de novo protein synthesis is dispensable for anti-apoptotic effects of NF-κB and support the possibility that NF-κB could exert its anti-apoptotic action through protein-protein interaction.
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Abbreviations
- NF-κB:
-
nuclear factor κB
- IL-1β:
-
interleukin 1β
- TNF-α:
-
tumor necrosis factor α
- CHX:
-
cycloheximide
- PBS:
-
phosphate-buffered saline
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Acknowledgements
We thank Lilen Sarol for critical reading of the manuscript. This work was supported by grants-in-aid from the Ministry of Health and Welfare, the Ministry of Education, Science, Sports and Culture of Japan, and the Japanese Health Sciences Foundation.
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Kajino, S., Suganuma, M., Teranishi, F. et al. Evidence that de novo protein synthesis is dispensable for anti-apoptotic effects of NF-κB. Oncogene 19, 2233–2239 (2000). https://doi.org/10.1038/sj.onc.1203560
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DOI: https://doi.org/10.1038/sj.onc.1203560
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