GMP Recombinant Human IL-33 (carrier-free)

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Other Names
C9orf26, IL1F11, NFHEV, DVS 27
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GMP recombinant human IL-33 induces dose-dependent proliferation of D10.G4.1 cells. Deep Blue Cell Viability™ Kit (Cat. No. 424701) is used to measure the proliferation. The ED50 range for this effect is 0.1 - 0.5 ng/mL.
  • Human_IL-33_CF_GMP-RECOM_1_112421
    GMP recombinant human IL-33 induces dose-dependent proliferation of D10.G4.1 cells. Deep Blue Cell Viability™ Kit (Cat. No. 424701) is used to measure the proliferation. The ED50 range for this effect is 0.1 - 0.5 ng/mL.
Cat # Size Price Save
581814 25 µg ¥86,730
581816 100 µg ¥236,880

IL-33 belongs to the IL-1 family and is closely related in structure to IL-18 and IL-1β. IL-33, IL-1β, and IL-18 are synthesized as biologically inactive precursors and are cleaved by the enzyme caspase-1 to be secreted as active mature forms. IL-33 stimulates target cells by binding to the IL-1R/TLR superfamily member ST2 and, subsequently, activates NF-κβ and MAPK pathways via identical signalling events to those observed for IL-1β. In addition, IL-33 is a nuclear factor (NF-HEV) abundantly expressed in high endothelial venules from lymphoid organs that associate with chromatin and exhibit transcriptional regulatory properties.

Product Details
Technical data sheet

Product Details

Human IL-33, amino acids Ser112-Thr270 (Accession# NM_ 033439) was expressed in E. coli.
Molecular Mass
The 159 amino acid recombinant protein has a predicted molecular mass of approximately 18 kD. The DTT-reduced protein migrates at approximately 19 kD and non-reduced protein migrates at approximately 20 kD by SDS-PAGE. The N-terminal amino acid is Serine.
>95%, as determined by Coomassie stained SDS-PAGE.
0.1 µm filtered protein solution is in PBS, 1 mM EDTA, 2 mM TCEP
Endotoxin Level
Less than 0.1 EU per µg protein as determined by the LAL method
500 µg/mL
Storage & Handling
Unopened vial can be stored between 2°C and 8°C for up to 2 weeks, at -20°C for up to six months, or at -70°C or colder until the expiration date. For maximum results, quick spin vial prior to opening. The protein can be aliquoted and stored at -20°C or colder. Stock solutions can also be prepared at 50 - 100 µg/mL in appropriate sterile buffer, carrier protein such as 0.2 - 1% endotoxin-free BSA or HSA can be added when preparing the stock solution. Aliquots can be stored between 2°C and 8°C for up to one week or stored at -20°C or colder for up to 3 months. Avoid repeated freeze/thaw cycles.
ED50 = 0.1 - 0.5 ng/mL as determined by the dose-dependent stimulation of D10.G4.1 cell proliferation. Deep Blue Cell Viability™ Kit (Cat. No. 424701) is used to measure the proliferation.

Cell Culture

Application Notes

BioLegend carrier-free recombinant proteins provided in liquid format are shipped on blue-ice. Our comparison testing data indicates that when handled and stored as recommended, the liquid format has equal or better stability and shelf-life compared to commercially available lyophilized proteins after reconstitution. Our liquid proteins are validated in-house to maintain activity after shipping on blue ice and are backed by our 100% satisfaction guarantee. If you have any concerns, contact us at


GMP Recombinant Proteins. BioLegend GMP recombinant proteins are manufactured in a dedicated GMP facility and compliant with ISO 13485:2016. For research or ex vivo cell processing use. Not for use in diagnostic or therapeutic procedures. Our processes include:

  • Batch-to-batch consistency
  • Material traceability
  • Documented procedures
  • Documented employee training
  • Equipment maintenance and monitoring records
  • Lot-specific certificates of analysis
  • Quality audits per ISO 13485:2016
  • QA review of released products

BioLegend GMP recombinant proteins are manufactured and tested in accordance with USP Chapter 1043, Ancillary Materials for Cell, Gene and Tissue-Engineered Products and Ph. Eur. Chapter 5.2.12.

Antigen Details


IL-33 mRNA is expressed in a broad range of human tissues, such as heart, small intestine, brain, ovary, testis, pancreas, and colon. Higher IL-33 expression was detected in human keratinocyte, fibroblast, myocyte, and alveolar cells

IL-33 drives production of Th2-associated cytokines from in vitro polarized Th2 cells. In mice, IL-33 injection induced the expression of IL-4, IL-5, and IL-13 and led to severe pathological changes in the lung and the digestive tract. In addition, IL-33 acts as a chemoattractant for Th2 cells, both in vitro and in vivo. TNF-α and IL-1β are activators of IL-33 transcription in fibroblasts and keratinocytes.
Th2 cells, mast cells, basophils, eosinophils and natural killer cells
IL-1 family receptor T1/ST2 and IL-1RAcP (IL-1 receptor associated protein).
Measured by its ability to induce proliferation of D10.G4.1 cells.
Biology Area
Cell Biology, Immunology, Stem Cells, Transcription Factors
Molecular Family
Antigen References
  1. Schmitz J, et al. 2005. Immunity. 23:479-90.
  2. Barksby HE, et al. 2007. Clin Exp Immunol. 149:217-25.
  3. Arend WP, et al. 2008. Immunol Rev. 223:20-38.
  4. Suzukawa M, et al. 2008. J Immunol. 181:5981-9.
  5. Moussion C, et al. 2008. PLoS One. 3:e3331.
  6. Mildner M, et al. 2010. Cardiovasc Res. 87:769-77.
Gene ID
90865 View all products for this Gene ID
View information about IL-33 on

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For research and ex vivo cell processing use. Not for diagnostic or therapeutic procedures. Not for resale. BioLegend will not be held responsible for patent infringement or other violations that may occur with the use of our products.


*These products may be covered by one or more Limited Use Label Licenses (see the BioLegend Catalog or our website, BioLegend products may not be transferred to third parties, resold, modified for resale, or used to reverse engineer functionally similar materials without written approval of BioLegend. By use of these products you accept the terms and conditions of any and all applicable Limited Use Label Licenses. Unless otherwise indicated, these products are for research and ex vivo cell processing use only and not intended for human or animal diagnostic or therapeutic use.


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