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A requirement for CARMA1 in TCR-induced NF-κB activation

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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Figure 1: Expression of an NF-κB–dependent EGFP gene in a mutant Jurkat T cell line.
Figure 2: NF-κB activation in JPM50.
Figure 3: Location of specific mutation(s) in JPM50.6 cells.
Figure 4: Proximal signaling pathways of CD3 and CD28 in JPM50.6 cells.
Figure 5: Expression of CARMA1 in JPM50.6 cells.
Figure 6: CARMA1 and expression of the gene encoding IL-2.
Figure 7: CARMA1 recruits Bcl10 to cytoplasmic membrane.

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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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Correspondence to Xin Lin.

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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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