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The Jun Kinase Cascade Is Responsible for Activating the CD28 Response Element of the IL-2 Promoter: Proof of Cross-Talk with the IB Kinase Cascade¹

Division of Clinical Immunology and Allergy, Department of Medicine, University of California, Los Angeles, School of Medicine, Los Angeles, CA 90095

Costimulation of TCR/CD3 and CD28 receptors leads to activation of the Jun kinase (JNK) cascade, which plays a key role in T cell activation, including activation of the IL-2 promoter. We demonstrate that the JNK cascade plays a central role in the activation of the CD28 response element (CD28RE) in the IL-2 promoter. This response element is linked to an activating protein-1 (AP-1) site, which functions synergistically with the CD28RE. The role of the JNK cascade in the activation of this composite element is twofold: 1) activation of the AP-1 site through transcriptional activation of c-Jun, and 2) activation of the CD28RE through selective cross-talk with IB kinase-ß (IKKß). Dominant-negative versions of JNK kinase, c-Jun, and IKKß interfered in CD3- plus CD28-induced CD28RE/AP-1 luciferase activity in Jurkat cells. In contrast, the dominant-active JNK kinase kinase, MEKK1, induced CD28RE/AP-1 luciferase activity, in parallel with induction of c-Jun and c-Rel binding to this combined promoter site. Dominant-active MEKK1 also induced transfected IKKß, but not IKK, activity. In contrast to the JNK cascade, the extracellular signal-regulated kinase (ERK) cascade did not exert an affect on the CD28RE/AP-1 site, but did contribute to activation of the distal NF-AT/AP-1 site.

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