Intracellular Interleukin-1 Receptor 2 Binding Prevents Cleavage and Activity of Interleukin-1α, Controlling Necrosis-induced Sterile Inflammation
Overview
Affiliations
Necrosis can induce profound inflammation or be clinically silent. However, the mechanisms underlying such tissue specificity are unknown. Interleukin-1α (IL-1α) is a key danger signal released upon necrosis that exerts effects on both innate and adaptive immunity and is considered to be constitutively active. In contrast, we have shown that necrosis-induced IL-1α activity is tightly controlled in a cell type-specific manner. Most cell types examined expressed a cytosolic IL-1 receptor 2 (IL-1R2) whose binding to pro-IL-1α inhibited its cytokine activity. In cell types exhibiting a silent necrotic phenotype, IL-1R2 remained associated with pro-IL-1α. Cell types possessing inflammatory necrotic phenotypes either lacked IL-1R2 or had activated caspase-1 before necrosis, which degraded and dissociated IL-1R2 from pro-IL-1α. Full IL-1α activity required cleavage by calpain after necrosis, which increased its affinity for IL-1 receptor 1. Thus, we report a cell type-dependent process that fundamentally governs IL-1α activity postnecrosis and the mechanism allowing conditional release of this blockade.
Hyper-induction of IL-6 after TLR1/2 stimulation in calves with bovine respiratory disease.
Reid C, Donlon J, Remot A, Kennedy E, De Matteis G, OFarrelly C PLoS One. 2024; 19(11):e0309964.
PMID: 39541407 PMC: 11563416. DOI: 10.1371/journal.pone.0309964.
IL-1 Receptor Dynamics in Immune Cells: Orchestrating Immune Precision and Balance.
Kim D, Lee W Immune Netw. 2024; 24(3):e21.
PMID: 38974214 PMC: 11224669. DOI: 10.4110/in.2024.24.e21.
Ni H, Hu X, Yang N, Liu X, Cai W, Zhong R Toxicol Res. 2024; 40(3):377-387.
PMID: 38911547 PMC: 11187041. DOI: 10.1007/s43188-024-00229-0.
Wang C, Chen Y, Yin X, Xu R, Ruze R, Song J J Pancreatol. 2024; 7(2):119-130.
PMID: 38883575 PMC: 11175735. DOI: 10.1097/JP9.0000000000000175.
IL-1 signaling pathway, an important target for inflammation surrounding in myocardial infarction.
Huang J, Kuang W, Zhou Z Inflammopharmacology. 2024; 32(4):2235-2252.
PMID: 38676853 DOI: 10.1007/s10787-024-01481-4.