Abstract
Nuclear protein IRF-1 (interferon regulatory factor 1) was earlier shown to bind to cis-acting regulatory elements present on interferon (IFN)-alpha/beta genes and some IFN-inducible genes. Here we show that in both human FS-4 and murine L929 cells, steady-state levels of IRF-1 mRNA were increased by treatment with tumor necrosis factor (TNF), interleukin 1 (IL-1), poly(I).poly(C), or IFN-beta. IRF-1 mRNA induction was also demonstrated in cells treated with calcium ionophore A23187 or with phorbol 12-myristate 13-acetate, but not with epidermal growth factor, dibutyryl-cAMP, or the adenylate cyclase activator forskolin. To determine whether stimulation of IRF-1 mRNA levels correlates with IFN-beta induction, we compared IRF-1 and IFN-beta mRNA levels in cells exposed to various stimuli. In L929 cells, treatment with poly(I).poly(C) under conditions that failed to induce significant levels of IFN-beta mRNA led to a very low induction of IRF-1 mRNA, but "priming" cells with IFN prior to the addition of poly(I).poly(C) greatly increased both IRF-1 and IFN-beta mRNAs. In FS-4 cells an increase in IFN-beta mRNA (examined by the polymerase chain reaction) was seen after treatment with TNF, IL-1, A23187, or poly(I).poly(C), but not with IFN-beta, epidermal growth factor, dibutyryl-cAMP, or forskolin. Thus, all treatments that increased steady-state levels of IFN-beta mRNA also enhanced IRF-1 mRNA levels. However, treatment with IFN-beta, which caused a marked stimulation in IRF-1 mRNA, failed to produce a detectable increase in IFN-beta mRNA. It appears that IRF-1 may be necessary but not sufficient for IFN-beta induction. The ability of TNF and IL-1 to increase both IRF-1 and IFN-beta mRNAs may be responsible for some similarities in the actions of TNF, IL-1, and the IFNs.
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