Abstract
Nuclear factor κB (NF-κB) is a eukaryotic transcription factor which responds to different extracellular signals. It is involved in immune response, inflammation, and cell proliferation. Increased expression of c-Rel (or its viral homolog v-Rel), one component of the NF-κB factors, induces tumorigenesis in different systems. The activity of NF-κB can be regulated by protein kinase A (PKA) in a cAMP-independent manner. Our previous results showed that c-MYC induces the activity of PKA by inducing the transcription of the gene encoding the PKA catalytic subunit β (PKA-Cβ). Constitutive expression of PKA-Cβ in Rat1a cells induces their transformation. Here we show that CREB is unlikely to be a phosphorylation target of PKA-Cβ as characterized by different cell lines. Electrophoretic mobility shift assays showed that c-Rel is present as a significant component of the NF-κB factors in c-MYC overexpressing status. The transcriptional activity of c-Rel was significantly stimulated by PKA-Cβ. Coactivators p300/CBP are at least partially responsible for the enhanced activation mediated by c-Rel and PKA-Cβ. Interaction between c-Rel and PKA-Cβ was demonstrated using coimmunoprecipitation assays. Immunoprecipitation-in vitro phosphorylation assays showed the direct phosphorylation of c-Rel by PKA-Cβ. These results indicate that c-Rel is a reasonable phosphorylation target of PKA-Cβ, and that the transcriptional activity of c-Rel is stimulated by PKA-Cβ possibly through the interaction with p300/CBP.
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Abbreviations
- CBP :
-
CREB-binding protein
- IκB :
-
Inhibitor factor κB
- NF-κB :
-
Nuclear factor κB
- PKA :
-
Protein kinase A
- SDS-PAGE :
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- TC :
-
Tetracycline
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Acknowledgements
We thank Dr. R. Dalla-Favera, in whose laboratory this work was initiated. We are grateful to Drs. D. Baltimore, U. Siebenlist, and R. Goodman for the gifts of HIILuc, pMT2T-c-Rel, and CBP/p300 plasmids. This work was supported by National Science Council NSC 91-2320-B-002-070 and NSC 92-2320-B010-078, and National Health Research Institutes NHRI-EX93-9329SI to K.J.W.
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Yu, SH., Chiang, WC., Shih, HM. et al. Stimulation of c-Rel transcriptional activity by PKA catalytic subunit β. J Mol Med 82, 621–628 (2004). https://doi.org/10.1007/s00109-004-0559-7
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DOI: https://doi.org/10.1007/s00109-004-0559-7