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IFN-alphabeta is a potent immunoregulatory cytokine involved in the defense against viral and bacterial infections. In this study, we describe an as yet undefined IFN-alphabeta-dependent pathway of IFN-gamma induction in mice. This pathway is based on a synergism of IFN-alphabeta and IL-18, and is independent of IL-12 signaling yet dependent on STAT4. In contradiction to current dogma, we show further that IFN-alphabeta alone induces tyrosine phosphorylation of STAT4 in murine splenocytes of different mouse strains. This pathway participates in the induction of IFN-gamma by Gram-negative bacteria and is therefore expected to play a role whenever IFN-alpha or IFN-beta and IL-18 are produced concomitantly during bacterial, viral, or other infections.

the journal of immunology/the journal of immunology

Cutting Edge: A Murine, IL-12-Independent Pathway of IFN-γ Induction by Gram-Negative Bacteria Based on STAT4 Activation by Type I IFN and IL-18 Signaling