Abstract
Stimulation of the T cell receptor (TCR) complex initiates multiple signaling cascades that lead to the activation of several transcription factors, including the NF-κB family members. Although various proximal signaling components of the TCR have been intensively studied, the distal components that mediate TCR-induced NF-κB activation remain largely unknown. Using a somatic mutagenesis approach, we cloned a CARMA1-deficient T cell line. Deficiency in CARMA1 (originally known as CARDII) resulted in selectively impaired activation of NF-κB induced by the TCR and a consequent defect in interleukin-2 (IL-2) production. Reconstitution of the CARMA1-deficient cells with CARMA1 fully rescued this signaling defect. Together, our results show that CARMA1 is an essential signaling component that mediates TCR-induced NF-κB activation.
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Acknowledgements
We thank V. Dixit, W. Greene, S.-C. Sun, J. Tschop, M. Yan and A. Weiss for reagents; M. Lindermann and S. Gaffen for help in the HT-2 cell proliferation assays; and J. Hay and S. Gaffen for critical reading of this manuscript.
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Wang, D., You, Y., Case, S. et al. A requirement for CARMA1 in TCR-induced NF-κB activation. Nat Immunol 3, 830–835 (2002). https://doi.org/10.1038/ni824
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DOI: https://doi.org/10.1038/ni824
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