Titel
Context-Dependent IL-1 mRNA-Destabilization by TTP Prevents Dysregulation of Immune Homeostasis Under Steady State Conditions
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Abstract
The bioavailability of the major pro-inflammatory cytokines IL-1α and IL-1β is tightly controlled by transcription and post-translational processing to prevent hyperinflammation. The role of mRNA decay in maintenance of physiological IL-1 amounts remained unknown. Here we show that the down-regulation of Il1a and Il1b mRNA by the mRNA-destabilizing protein TTP (gene Zfp36) is required for immune homeostasis. The TTP deficiency syndrome, a multi organ inflammation in TTP−/− mice, was significantly ameliorated upon deletion of the IL-1 receptor. Il1a and Il1b played non-redundant roles in triggering the pathological IL-1 signaling in TTP−/− mice. Accordingly, tissues from TTP−/− animals contained increased amounts of Il1b mRNA. Unexpectedly, TTP destabilized Il1b mRNA in cell type-specific ways as evident from RNA-Seq and mRNA stability assays. These results demonstrate that TTP-driven mRNA destabilization depends on the cellular context. Moreover, such context-defined mRNA decay is essential for keeping steady state IL-1 levels in the physiological range.
Stichwort
mRNA stabilitytristetraprolinTTPZfp36Interleukin 1betaInterleukin 1alphainflammationimmune homeostasis
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
phaidra.univie.ac.at/o:1301029
Erschienen in
Titel
Frontiers in Immunology
Band
11
ISSN
1664-3224
Erscheinungsdatum
2020
Publication
Frontiers Media SA
Fördergeber
Austrian Science Fund (FWF) — P33000-B
Austrian Science Fund (FWF) — P31848-B
Austrian Science Fund (FWF) — W1261
Erscheinungsdatum
2020
Zugänglichkeit
Rechte
Rechteangabe
© 2020 Sneezum, Eislmayr, Dworak, Sedlyarov, Le Heron, Ebner, Fischer, Iwakura and Kovarik
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