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. 1996 Nov 1;184(5):1663–1669. doi: 10.1084/jem.184.5.1663

c-rel regulation of IL-2 gene expression may be mediated through activation of AP-1

PMCID: PMC2192877  PMID: 8920856

Abstract

T cell activation by antigen/MHC induces the expression of several genes critical to the immune response, including interleukin-2. T cells from mice deficient for the NF-kappa B family member c-rel cannot activate IL-2 gene expression. However, mutating the NF-kappa B site in the IL-2 promoter has only moderate effects. To investigate additional ways c-Rel could regulate IL-2 gene expression, we determined whether c- rel overexpression could increase the activity of other transcription factors involved in IL-2 promoter regulation: NF-AT, Oct/OAP (ARRE-1), and AP-1. In Jurkat TAg cells, overexpression of c-Rel increased AP-1 activation approximately 17-fold. Moreover, AP-1 activity stimulated by anti-TCR Abs or PMA/ionomycin was further increased by c-Rel overexpression. c-Rel overexpression did not affect NF-AT or ARRE-1 activity. Additionally, overexpression of c-Rel activated the nonconsensus AP-1 site from the IL-2 promoter (NF-IL-2B), although to a lesser extent, approximately sixfold. AP-1 activation required both the DNA binding and transactivation domains of c-Rel. Our results may provide an explanation for the effect on IL-2 gene activation in c-rel- deficient mice.

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Selected References

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