This site will redirect to on April 7. Get details >


Alias: Interleukin-33, IL-1F11

IL-33 is an IL-1 family member. It is a pro-inflammatory TH2 polarizing cytokine that enhances TH2 cell responses. IL-33 is not typically expressed by hematopoietic cells, but rather by fibroblasts, epithelial cells, and endothelial cells. In the absence of pro-inflammatory stimuli, IL-33 localizes to the nucleus, where in its uncleaved form, interacts with H2A and H2B. Mystery surrounds how IL-33 is secreted from cells and whether it is the cleaved or full-length protein that is active in vivo. The activating protein of IL-33 is still up for debate, though it is believed to be calpain that cleaves it to its mature form. IL-33 binds to ST2, an IL-1R family member receptor that is expressed on TH2, but not TH1 cells. Upon ligand binding, ST2 heterodimerizes with IL-1RAP that results in the activation of the NFκB and MAPK pathways. The activation of NFκB in mast cells results in mast cell degranulation and production of IL-1β, IL-3, IL-6, TNF, CXCL2, CCL2, CCL3, PGD2, and LTB4. IL-33 also acts directly on eosinophils to enhance their survival and adhesive properties, as well as their production of IL-8 and superoxide. In mast and T cells, the IL-33 activation of the MAPK pathways and induces the production of IL-5, IL-13, CCL5, CCL17, and CCL24. IL-33 is associated with infections, asthma, anaphylaxis, atherosclerosis, Alzheimer’s disease, pain, and arthritis, ulcerative colitis, and Crohn’s disease.

Suggest a new product or place a custom order.

8 Item(s)

Set Descending Direction
25 | 50
Name Clone Application Cat. No. Reg.  

Human IL-33 Platinum ELISA


Mouse IL-33 Platinum ELISA


Mouse IL-33 ELISA Ready-SET-Go!®

ELISA 88-7333 RUO

ProcartaPlex Human IL-33 Simplex

Multiplex EPX01A-12048 RUO

Mouse IL-33 Recombinant Protein

FA 14-8332 RUO

Mouse IL-33 Recombinant Protein Carrier-Free

FA 34-8332 RUO

Human IL-33 Recombinant Protein Carrier-Free

FA 34-8539 RUO

Mouse IL-33 Lyophilized Standard

ELISA 29-8332 RUO

8 Item(s)

Set Descending Direction
25 | 50

* = Please click on product link to see all available sizes and pricing.

FC = Flow Cytometry, Intracellular Staining/Flow Cytometry; ELISA = ELISA, ELISPOT; Multiplex = Multiplex Immunoassays; ICC = Immunocytochemistry; IHC = Immunohistochemistry, Immunofluorescence, Microscopy, Imaging, In Vivo Imaging; IHC-F = Immunohistochemical Staining of Frozen Tissue Sections; IHC-P = Immunohistochemical Staining of Formalin-Fixed Paraffin Embedded Tissue Sections; FA = Functional Assays, Bioassays, Neutralization, Depletion Studies, Biomolecule Conjugation; IP = Immunoprecipitation; WB = Western Blotting

RUO = Research Use Only; GPR = General Purpose Reagent; ASR = Analyte Specific Reagent. Analytical and performance characteristics are not established; CE = CE-marked reagents