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. 1998 Jun 1;17(11):3101–3111. doi: 10.1093/emboj/17.11.3101

Calcineurin preferentially synergizes with PKC-theta to activate JNK and IL-2 promoter in T lymphocytes.

G Werlen 1, E Jacinto 1, Y Xia 1, M Karin 1
PMCID: PMC1170649  PMID: 9606192

Abstract

Costimulation of the T cell receptor (TCR) and CD28 is required for optimal interleukin-2 (IL-2) induction. These signals, which can be replaced by the pharmacological agents phorbol ester (PMA) and Ca2+ ionophore, synergistically activate the mitogen-activated protein kinase (MAPK) JNK. Cyclosporin A, an inhibitor of the Ca2+-dependent phosphatase calcineurin which blocks IL-2 induction, abrogates Ca2+-triggered synergistic JNK activation. As protein kinase C (PKC) downregulation inhibits PMA+ionophore-induced JNK activation, we examined whether a particular PKC isoform is preferentially involved in this response. We found that PKC-theta but neither PKC-alpha nor PKC-epsilon participates in JNK activation, whereas all three PKCs lead to ERK MAPK activation. PKC-theta specifically cooperates with calcineurin, and together their signals converge on (or upstream of) Rac leading to potent JNK activation. Similarly, calcineurin and PKC-theta specifically synergize to induce transcription of reporters driven by the c-jun and IL-2 promoters. PKC-theta and calcineurin are also partially responsible for the synergistic activation of JNK following TCR and CD28 ligation. Preferential cooperation between PKC-theta and calcineurin is observed in Jurkat T cells but not in HeLa cells. These results indicate that PKC isozymes have distinct biological functions and suggest that synergistic JNK activation is an important function for PKC-theta in T-cell activation.

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Selected References

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