Abstract
T-cell activation and induction of interleukin-2 (IL-2) expression in human T lymphocytes require both interaction of foreign antigen with the T-cell antigen receptor and protein kinase C (PKC) stimulation. Agents such as phorbol 12-myristate 13-acetate (PMA) that stimulate PKC augment the effects of antigen but are not sufficient for IL-2 activation. By analysis of deletion mutants, we identified three DNA sequences extending from -73 to -89, -217 to -255, and -263 to -279, designated IL-2 sites A, D, and E, respectively, that are required for maximal induction of IL-2 expression. One of these regions, site E, interacted with a protein (NF-IL-2E) present only in the nuclei of cells which have been stimulated. The other two sequences interacted with a protein (NF-IL-2A) that is constitutively expressed in T cells. When multiple tandem copies of either the E site or the A site were placed upstream of the gamma-fibrinogen promoter, they activated expression via this promoter in response to signals initiated at the antigen receptor but not following PMA stimulation. For this reason, we denoted them antigen receptor response elements. The uncoupling of antigen receptor and PKC requirements in these studies indicates that these signal pathways are, at least in part, distinct and integrated at the level of the gene.
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