Activation of the transcription factor c-Maf in T cells is dependent on the CARMA1-IKKβ signaling cascade

Science Signaling
Marzenna BlonskaXin Lin

Abstract

The proto-oncogene c-Maf is a transcription factor that plays a critical role in the differentiation of various T helper (T(H)) cell subsets. The amount of c-Maf increases after stimulation of the T cell receptor (TCR), which results in the production of multiple cytokines. We showed that two essential regulators of the transcription factor nuclear factor κB (NF-κB), the scaffold protein CARMA1 and the kinase IKKβ [inhibitor of NF-κB (IκB) kinase β], are also critical for the activation of c-Maf. Although CARMA1 deficiency did not affect the TCR-dependent increase in c-Maf abundance in T cells, CARMA1-dependent activation of the IKK complex was required for the nuclear translocation of c-Maf and its binding to the promoters of its target genes. Consistent with a role for c-Maf in the development of T follicular helper (T(FH)) cells, which provide help to B cells in the germinal centers of the spleen, CARMA1- or IKKβ-deficient mice immunized with peptide antigen had defects in the generation of T(FH) cells, formation of germinal centers, and production of antigen-specific antibodies. Together, these data suggest a mechanism by which c-Maf is regulated during T cell activation and differentiation.

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Citations

Jun 2, 2009·Médecine sciences : M/S·Nicolas Bidère
Jul 1, 2015·Diabetes/metabolism Research and Reviews·Chuan Zhang, Zhi-Min Guo
May 7, 2020·International Journal of Molecular Sciences·Chao-Yuan HsuHuey-Kang Sytwu
Mar 3, 2020·Frontiers in Immunology·Claire ImbrattaGrégory Verdeil

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