Interferons limit inflammatory responses by induction of tristetraprolin

Blood
Ines SauerPavel Kovarik

Abstract

Interferons (IFNs) are cytokines with pronounced proinflammatory properties. Here we provide evidence that IFNs also play a key role in decline of inflammation by inducing expression of tristetraprolin (Ttp). TTP is an RNA-binding protein that destabilizes several AU-rich element-containing mRNAs including TNFalpha. By promoting mRNA decay, TTP significantly contributes to cytokine homeostasis. Now we report that IFNs strongly stimulate expression of TTP if a costimulatory stress signal is provided. IFN-induced expression of Ttp depends on the IFN-activated transcription factor STAT1, and the costimulatory stress signal requires p38 MAPK. Within the Ttp promoter we have identified a functional gamma interferon-activated sequence that recruits STAT1. Consistently, STAT1 is required for full expression of Ttp in response to LPS that stimulates both p38 MAPK and, indirectly, interferon signaling. We demonstrate that in macrophages IFN-induced TTP protein limits LPS-stimulated expression of several proinflammatory genes, such as TNFalpha, IL-6, Ccl2, and Ccl3. Thus, our findings establish a link between interferon responses and TTP-mediated mRNA decay during inflammation, and propose a novel immunomodulatory role of IFNs.

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