Abstract
The human c-rel proto-oncogene (REL) encodes a subunit of the nuclear factor-kappaB (NF-κB) transcription factor. In this report, we have identified an identical point mutation in two human B-cell lymphomas (follicular (FL) and mediastinal) that changes serine (Ser)525 (TCA) to proline (Pro) (CCA) within the REL transactivation domain. This mutation was not identified in a similarly sized cohort of healthy individuals. In the mediastinal B-cell lymphoma, the mutation in REL is of germ-line origin. In both tumors, the S525P mutant allele is over-represented. REL-S525P shows enhanced in vitro transforming activity in chicken spleen cells. REL-S525P has a reduced ability to activate the human manganese superoxide dismutase (MnSOD) promoter in A293 cells; however, the MnSOD protein shows increased expression in REL-S525P-transformed chicken spleen cells as compared to wild-type REL-transformed cells. Ser525 is a site for phosphorylation by IκB kinase (IKK) in vitro. The S525P mutation reduces IKKα- and tumor necrosis factor (TNF)α-stimulated transactivation by a GAL4-REL protein. Furthermore, REL-S525P-transformed chicken spleen cells are more resistant to TNFα-induced cell death than cells transformed by wild-type REL. These results suggest that the S525P mutation contributes to the development of human B-cell lymphomas by affecting an IKKα-regulated transactivation activity of REL.
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Acknowledgements
We thank K Bandick, C Becher, D Schuster and P Chall for technical assistance, and thank members of German Lymphoma Reference Pathologists Panel for providing and reviewing samples within the Network ‘Molecular Mechanisms in Malignant Lymphoma’. DTS was partially supported by a Pre-doctoral Fellowship from the Natural Sciences & Engineering Research Council of Canada, and JAA was partially supported by the Boston University Undergraduate Research Opportunities Program. This work was supported by NIH Grant CA47763 (TDG) and Deutsche Krebshilfe project grant 70-3173-Tr3 (RS, LH, CP).
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Starczynowski, D., Trautmann, H., Pott, C. et al. Mutation of an IKK phosphorylation site within the transactivation domain of REL in two patients with B-cell lymphoma enhances REL's in vitro transforming activity. Oncogene 26, 2685–2694 (2007). https://doi.org/10.1038/sj.onc.1210089
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DOI: https://doi.org/10.1038/sj.onc.1210089
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