Human IL-33 Antibody

Recombinant Monoclonal Antibody..
  
  • Species Reactivity
    Human
  • Specificity
    Detects human IL-33 in direct ELISAs and Western blots.
  • Source
    Recombinant Monoclonal Goat IgG Clone # 40015C
  • Purification
    Protein A or G purified from cell culture supernatant
  • Immunogen
    E.coli-derived recombinant human IL-33
    Ser112-Thr270
    Accession # O95760
  • Formulation
    Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
  • Label
    Unconjugated
Applications
  •  
    Recommended
    Concentration
    Sample
  • Western Blot
    1 µg/mL
    See below
  • Immunohistochemistry
    0.1-25 µg/mL
    See below
    • Human IL-33 Sandwich Immunoassay
      Reagent
  • ELISA Capture (Matched Antibody Pair)
    2-8 µg/mL 
    Human IL‑33 Antibody (Catalog # MAB36253)
  • ELISA Detection (Matched Antibody Pair)
    0.1-0.4 µg/mL 
    Human IL‑33 Biotinylated Antibody (Catalog # BAF3625)
  • ELISA Standard
     
    Recombinant Human IL-33 Protein (Catalog # 3625-IL)
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Data Examples
Detection of Human IL‑33 by Western Blot. Western blot shows lysates of HEK293 human embryonic kidney cell line either mock transfected or transfected with human IL-33. PVDF membrane was probed with 1 µg/mL of Goat Anti-Human IL‑33 Monoclonal Antibody (Catalog # MAB36253) followed by HRP-conjugated Anti-Goat IgG Secondary Antibody (Catalog # HAF017). A specific band was detected for IL‑33 at approximately 30 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.
Immunohistochemistry
IL‑33 in Human Tonsil. IL‑33 was detected in immersion fixed paraffin-embedded sections of human tonsil using Goat Anti-Human IL‑33 Monoclonal Antibody (Catalog # MAB36253) at 0.1 µg/mL overnight at 4 °C. Tissue was stained using the Anti-Goat HRP-DAB Cell & Tissue Staining Kit (brown; Catalog # CTS008) and counterstained with hematoxylin (blue). Specific staining was localized to nuclei in epithelial cells. View our protocol for Chromogenic IHC Staining of Paraffin-embedded Tissue Sections.
Preparation and Storage
  • Reconstitution
    Reconstitute at 0.5 mg/mL in sterile PBS.
  • Shipping
    The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
  • Stability & Storage
    Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
    • 12 months from date of receipt, -20 to -70 °C as supplied.
    • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
    • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
Background: IL-33

IL-33, also known as NF-HEV and DVS 27, is a 30 kDa proinflammatory protein that may also regulate gene transcription (1‑3). DVS 27 was identifed as a gene that is up‑regulated in vasospastic cerebral arteries (1). NF-HEV was described as a nuclear factor that is preferentially expressed in the endothelial cells of high endothelial venules relative to endothelial cells from other tissues (2). IL-33 was identified based on sequence and structural homology with IL-1 family cytokines (3). DVS 27, NF-HEV, and IL-33 share 100% amino acid sequence identity. IL-33 is constitutively expressed in smooth muscle and airway epithelia. It is up‑regulated in arterial smooth muscle, dermal fibroblasts, and keratinocytes following IL-1 alpha or IL-1 beta stimulation (1, 3). Similar to IL-1, IL-33 can be cleaved in vitro by caspase-1, generating an N-terminal fragment that is slightly shorter than the C-terminal fragment (3, 4). The N-terminal portion of full length IL-33 contains a predicted bipartite nuclear localization sequence and a homeodomain-like helix-turn-helix DNA binding domain. By immunofluorescence, full length IL-33 localizes to the nucleus in HUVECs and transfectants (2). The C-terminal fragment, corresponding to mature IL-33, binds and triggers signaling through mast cell IL-1 R4/ST2L, a longtime orphan receptor involved in the augmentation of Th2 cell responses (3, 5-7). A ternary signaling complex is formed by the subsequent association of IL-33 and ST2L with IL-1R AcP (8). Stimulation of Th2 polarized lymphocytes with mature IL-33 in vitro induces IL-5 and IL-13 secretion (3). In vivo administration of mature IL-33 promotes increased production of IL-5, IL-13, IgE, and IgA, as well as splenomegaly and inflammatory infiltration of mucosal tissues (3). Full length and mature human IL-33 share 52‑58% aa sequence identity with mouse and rat IL-33. Human IL-33 shares less than 20% aa sequence identity with other IL-1 family proteins.

  • References:
    1. Onda, H. et al. (1999) J. Cereb. Blood Flow Metab. 19:1279.
    2. Baekkevold, E.S. et al. (2003) Am. J. Pathol. 163:69.
    3. Schmitz, J. et al. (2005) Immunity 23:479.
    4. Black, R.A. et al. (1989) J. Biol. Chem. 264:5323.
    5. Xu, D. et al. (1998) J. Exp. Med. 187:787.
    6. Lohning, M. et al. (1998) Proc. Natl. Acad. Sci. USA 95:6930.
    7. Dinarello, C.A. (2005) Immunity 23:461.
    8. Chackerian, A.A. et al. (2007) J. Immunol. 179:2551.
  • Long Name:
    Interleukin 33
  • Entrez Gene IDs:
    90865 (Human); 77125 (Mouse)
  • Alternate Names:
    C9orf26; C9orf26chromosome 9 open reading frame 26 (NF-HEV); DKFZp586H0523; DVS27; DVS27-related protein; IL1F11; IL-1F11; IL33; IL-33; interleukin 33; Interleukin-1 family member 11; interleukin-33; NFHEV; NF-HEV; NF-HEVNFEHEV; Nuclear factor from high endothelial venules; RP11-575C20.2
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