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Grundström, S. et al.

Grundström, Anderson, Scheipers, Sundstedt,

Bcl-3 and NFkappaB p50- p50 homodimers act as transcriptional repressors in tolerant CD4+ T cells.

The transcriptional events that control T cell tolerance are still poorly understood. To investigate why tolerant T cells fail to produce interleukin (IL)-2, we analyzed the regulation of NFkappaB-mediated transcription in CD4(+) T cells after tolerance induction in vivo. We demonstrate that a predominance of p50- p50 homodimers binding to the IL-2 promoter kappaB site in tolerant T cells correlated with repression of NFkappaB-driven transcription. Impaired translocation of the p65 subunit in tolerant T cells was a result from reduced activation of IkappaB kinase and poor phosphorylation and degradation of cytosolic IkappaBs. Moreover, tolerant T cells expressed high amounts of the p50 protein. However, the increased expression of p50 could not be explained by activation- induced de novo synthesis of the precursor p105, which was constitutively expressed in tolerant T cells. We also demonstrate the exclusive induction of the IkappaB protein B cell lymphoma 3 (Bcl-3) in tolerant T cells as well as its specific binding to the NFkappaB site. These results suggest that the cellular ratio of NFkappaB dimers, and thus the repression of NFkappaB activity and IL-2 production, are regulated at several levels in tolerant CD4(+) T cells in vivo.[1]

References

Bcl-3 and NFkappaB p50-p50 homodimers act as transcriptional repressors in tolerant CD4+ T cells. Grundström, S., Anderson, P., Scheipers, P., Sundstedt, A. J. Biol. Chem. (2004) [Pubmed]

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