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Gene Expression: IL-12-Induced STAT4 Contributes to IFN-
Promoter Activation by Up-Regulating the Binding Activity of IL-18-Induced Activator Protein 11


*
Department of Oncology, Osaka University Graduate School of Medicine, Osaka, Japan; and
Fujisaki Institute, Hayashibara Biochemical Laboratories, Okayama, Japan
IL-12 and IL-18 synergistically enhance IFN-
mRNA transcription
by activating STAT4 and AP-1, respectively. However, it is still
unknown how STAT4/AP-1 elicit IFN-
promoter activation. Using an
IL-12/IL-18-responsive T cell clone, we investigated the mechanisms
underlying synergistic enhancement of IFN-
mRNA expression induced
by these two cytokines. Synergy was observed in a reporter gene assay
using an IFN-
promoter fragment that binds AP-1, but not STAT4. An
increase in c-Jun, a component of AP-1, in the nuclear compartment was
elicited by stimulation with either IL-12 or IL-18, but accumulation of
serine-phosphorylated c-Jun was induced only by IL-18 capable of
activating c-Jun N-terminal kinase. The binding of AP-1 to the relevant
promoter sequence depended on the presence of STAT4. STAT4 bound with
c-Jun, and a phosphorylated c-Jun-STAT4 complex most efficiently
interacted with the AP-1-relevant promoter sequence. Enhanced cobinding
of STAT4 and c-Jun to the AP-1 sequence was also observed when
activated lymph node T cells were exposed to IL-12 plus IL-18. These
results show that STAT4 up-regulates AP-1-mediated IFN-
promoter
activation without directly binding to the promoter sequence, providing
a mechanistic explanation for IL-12/IL-18-induced synergistic
enhancement of IFN-
gene expression.
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