[PDF][PDF] Constitutive interferon attenuates RIPK1/3-mediated cytokine translation

HI Muendlein, J Sarhan, BC Liu, WM Connolly… - Cell reports, 2020 - cell.com
HI Muendlein, J Sarhan, BC Liu, WM Connolly, SA Schworer, I Smirnova, AY Tang, V Ilyukha…
Cell reports, 2020cell.com
Receptor-interacting protein kinase 1 (RIPK1) and 3 (RIPK3) are well known for their
capacity to drive necroptosis via mixed-lineage kinase-like domain (MLKL). Recently,
RIPK1/3 kinase activity has been shown to drive inflammation via activation of MAPK
signaling. However, the regulatory mechanisms underlying this kinase-dependent cytokine
production remain poorly understood. In the present study, we establish that the kinase
activity of RIPK1/3 regulates cytokine translation in mouse and human macrophages …
Summary
Receptor-interacting protein kinase 1 (RIPK1) and 3 (RIPK3) are well known for their capacity to drive necroptosis via mixed-lineage kinase-like domain (MLKL). Recently, RIPK1/3 kinase activity has been shown to drive inflammation via activation of MAPK signaling. However, the regulatory mechanisms underlying this kinase-dependent cytokine production remain poorly understood. In the present study, we establish that the kinase activity of RIPK1/3 regulates cytokine translation in mouse and human macrophages. Furthermore, we show that this inflammatory response is downregulated by type I interferon (IFN) signaling, independent of type I IFN-promoted cell death. Specifically, low-level constitutive IFN signaling attenuates RIPK-driven activation of cap-dependent translation initiation pathway components AKT, mTORC1, 4E-BP and eIF4E, while promoting RIPK-dependent cell death. Altogether, these data characterize constitutive IFN signaling as a regulator of RIPK-dependent inflammation and establish cap-dependent translation as a crucial checkpoint in the regulation of cytokine production.
cell.com