TCR and CD28 activate the transcription factor NF- B in T-cells viadistinct adaptor signaling complexes
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Thaker, R., Schneider, H., & Rudd, C. (2014). TCR and CD28 activate the transcription factor NF- B in T-cells viadistinct adaptor signaling complexes. Immunology Letters, 163 (1), 113-119. https://doi.org/10.1016/j.imlet.2014.10.020
The transcription factor NF-κB is needed for the induction of inflammatory responses in T-cells. Whether its activation by the antigen-receptor and CD28 is mediated by the same or different intracellular signaling pathways has been unclear. Here, using T-cells from various knock-out (Cd28−/−, adap−/−) and knock-in (i.e. Cd28 Y-170F) mice in conjunction with transfected Jurkat T-cells, we show that the TCR and CD28 use distinct pathways to activate NF-κB in T-cells. Anti-CD28 ligation alone activated NF-κB in primary and Jurkat T-cells as measured by NF-κB reporter and EMSA assays. Anti-CD28 also activated NF-κB normally in primary T-cells from adap−/− mice, while anti-CD3 stimulation required the adaptor ADAP. Over-expression of ADAP or its binding partner SKAP1 failed to enhance anti-CD28 activation of NF-κB, while ADAP greatly increased anti-CD3 induced NF-κB activity. By contrast, CD28 activation of NF-κB depended on GRB-2 binding to CD28 as seen in CD28 deficient Jurkat T-cells reconstituted with the CD28 YMN-FM mutant, and in primary T-cells from CD28 Y170F mutant knock-in mice. CD28 associated with GRB-2, and GRB-2 siRNA impaired CD28 NF-κB activation. GRB-2 binding partner and guanine nucleotide exchange factor, VAV1, greatly enhanced anti-CD28 driven activation of NF-κB. Further, unlike in the case of anti-CD28, NF-κB activation by anti-CD3 and its cooperation with ADAP was strictly dependent on LAT expression. Overall, we provide evidence that CD28 and the TCR complex regulate NF-κB via different signaling modules of GRB-2/VAV1 and LAT/ADAP pathways respectively.
Adaptors, ADAP, VAV-1, GRB-2, NF-κB
This work was supported by Wellcome Trust Progam Grant (PG) PKAG/504 to Principal Research Fellow (PRF) C.E. Rudd. We are grateful to Oreste Ocuto and Enzo Cerundolo from University of Oxford for providing CHC17 and 1G4 (Cd28−/−) Jurkat cells.
External DOI: https://doi.org/10.1016/j.imlet.2014.10.020
This record's URL: https://www.repository.cam.ac.uk/handle/1810/247318
Attribution 2.0 UK: England & Wales
Licence URL: http://creativecommons.org/licenses/by/2.0/uk/
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