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IL-33 (Interleukin-33) is a 270 amino acid, highly divergent protein belonging to the IL-1 family with an IL-1-like C-terminal domain. IL-33 is a dual function protein that may function both as a proinflammatory cytokine and an intracellular nuclear factor with transcriptional regulatory properties. IL-33 binds to and signals through IL1RL1/ST2 and its stimulation recruits MYD88, IRAK1, IRAK4, and TRAF6. IL-33 activates NF-kappaB and MAP kinases, and drives production of TH2-associated cytokines from in vitro polarized TH2 cells. In vivo, IL-33 induces the expression of IL-4, IL-5, and IL-13 and leads to severe pathological changes in mucosal organs. IL-33 is proteolytically converted to a mature form by CASP1 and is highly expressed in high endothelial venules found in tonsils, Peyer's patches and mesenteric lymph nodes and is almost undetectable in placenta. Prolonged IL-33 treatment of mice led to the development of eosinophilia, splenomegaly, and severe pathological changes in mucosal organs such as lungs, esophagus and small intestine. Recent experiments have shown that IL-33 can also co-localize with heterochromatin and possesses transcriptional repressor activities, indicating that IL-33 may function as both a proinflammatory cytokine and an intracellular nuclear factor with transcriptional regulatory properties. Despite its predicted molecular weight, IL-33 will often run at higher molecular weight in SDS-PAGE. Studies have shown that IL-33 can also co-localize with heterochromatin and possesses transcriptional repressor activities, indicating that IL-33 may function as both a proinflammatory cytokine, and an intracellular nuclear factor with transcriptional regulatory properties.
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Protein Aliases: DVS27-related protein; growth stimulation-expressed; H-IL-33; homolog of mouse growth stimulation-expressed; IL-1F11; IL-33; ILN; Interleukin; interleukin 1 receptor-like 1; interleukin 1 receptor-related protein; Interleukin-1 family member 11; Interleukin-1 receptor-like 1; Interleukin-33; Interleukin-33 receptor alpha chain; Interleukin33; Lymphocyte antigen 84; NF-HEV; nuclear factor for high endothelial venules; Nuclear factor from high endothelial venules; Protein ST2; Protein T1; RP11-575C20.2
Gene Aliases: 9230117N10Rik; C9orf26; DER4; DVS27; FIT-1; IL-33; IL1F11; IL1RL1; IL33; IL33R; Ly84; NF-HEV; NFEHEV; NFHEV; ST2; St2-rs1; ST2L; ST2V; Ste2; T1; T1/ST2
UniProt ID: (Human) Q01638, (Human) O95760, (Mouse) P14719, (Mouse) Q8BVZ5
Entrez Gene ID: (Pig) 100127134, (Human) 9173, (Human) 90865, (Pig) 100518643, (Mouse) 17082, (Mouse) 77125
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