Animal-Free IL-33 Protein, Human (His)

IL-33 protein, as a cytokine, binds to and signals through the IL1RL1/ST2 receptor, thereby activating the NF-kappa-B and MAPK signaling pathways in target cells. It is involved in the maturation of Th2 cells and contributes to the secretion of T helper cell type 2 related cytokines. Animal-Free IL-33 Protein, Human (His) is the recombinant human-derived animal-FreeIL-33 protein, expressed by E. coli , with C-His labeled tag. The total length of Animal-Free IL-33 Protein, Human (His) is 159 a.a., with molecular weight of ~18.93 kDa.

IL-33 protein, functioning as a cytokine, binds to and signals through the IL1RL1/ST2 receptor, thereby activating the NF-kappa-B and MAPK signaling pathways in target cells. Its involvement in the maturation of Th2 cells contributes to the secretion of T-helper type 2-associated cytokines. Additionally, IL-33 plays a crucial role in the activation of mast cells, basophils, eosinophils, and natural killer cells. Acting as an enhancer of the polarization of alternatively activated macrophages, it serves as a chemoattractant for Th2 cells and may function as an 'alarmin,' amplifying immune responses during tissue injury. IL-33 induces rapid UCP2-dependent mitochondrial rewiring, mitigating the generation of reactive oxygen species and preserving the integrity of the Krebs cycle, which is essential for the persistent production of itaconate and subsequent GATA3-dependent differentiation of inflammation-resolving alternatively activated macrophages. In quiescent endothelia, the uncleaved form of IL-33 is constitutively and abundantly expressed, acting as a chromatin-associated nuclear factor with transcriptional repressor properties, potentially sequestering nuclear NF-kappaB/RELA and thereby lowering the expression of its targets; this form is rapidly lost upon angiogenic or pro-inflammatory activation.

1.Measure by its ability to bind with recombinant ST2L (IL-33 receptor). The ED₅₀ for this effect is <54 ng/mL.
2.Measure by its ability to induce proliferation in D10.G4.1 cells. The ED₅₀for this effect is <0.1 ng/mL. The specific activity of recombinant human IL-33 is approximately >4 x10⁷ IU/ mg

Human

E. coli

C-His

O95760 (S112-T270)

90865  [NCBI]

MSITGISPITEYLASLSTYNDQSITFALEDESYEIYVEDLKKDEKKDKVLLSYYESQHPSNESGDGVDGKMLMVTLSPTKDFWLHANNKEHSVELHKCEKPLPDQAFFVLHNMHSNCVSFECKTDPGVFIGVKDNHLALIKVDSSENLCTENILFKLSET

Approximately 18.93 kDa

Greater than 95% as determined by reducing SDS-PAGE.

Lyophilized powder.

Lyophilized from a solution containing 1X PBS, pH 7.4.

<0.1 EU per 1 μg of the protein by the LAL method.

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH₂O.

Stored at -20°C for 2 years. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer (with carrier protein). It is recommended to freeze aliquots at -20°C or -80°C for extended storage.

Room temperature in continental US; may vary elsewhere.