Human IL-33 APC-conjugated Antibody

  • Species Reactivity
  • Specificity
    Detects human IL-33 in direct ELISAs and Western blots. In direct ELISAs and Western blots, no cross-reactivity with recombinant mouse IL‑33 is observed.
  • Source
    Monoclonal Rat IgG2B Clone # 390412
  • Purification
    Protein A or G purified from hybridoma culture supernatant
  • Immunogen
    E. coli-derived recombinant human IL-33
    Accession # O95760
  • Formulation
    Supplied in a saline solution containing BSA and Sodium Azide.
  • Label
  • Intracellular Staining by Flow Cytometry
    10 µL/106 cells
    See below
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
Intracellular Staining by Flow Cytometry
Detection of IL‑33 in HUVEC Human Cells by Flow Cytometry. HUVEC human umbilical vein endothelial cells were stained with Rat Anti-Human IL‑33 APC‑conjugated Monoclonal Antibody (Catalog # IC3625A, filled histogram) or isotype control antibody (Catalog # IC013A, open histogram). To facilitate intracellular staining, cells were fixed with Flow Cytometry Fixation Buffer (Catalog # FC004) and permeabilized with Flow Cytometry Permeabilization/Wash Buffer I (Catalog # FC005). View our protocol for Staining Intracellular Molecules.
Preparation and Storage
  • Shipping
    The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
  • Stability & Storage
    Protect from light. Do not freeze.
    • 12 months from date of receipt, 2 to 8 °C as supplied.
Background: IL-33

IL-33, also known as NF-HEV and DVS 27, is a proinflammatory protein that may also regulate gene transcription (1-3). DVS 27 was identified as a gene that is upregulated 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). IL-33 is constitutively expressed in smooth muscle and airway epithelia. It is upregulated 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 32 kDa 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 18 kDa fragment, corresponding to mature IL-33, binds and triggers signaling through mast cell IL-1 R4/ST2, a 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 ST2 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
Related Research Areas
Isotype Controls
Description Application Cat# Citations Images  

Rat IgG2B APC‑conjugated Isotype Control

Ctrl IC013A 3  
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Staining Reagents
Description Application Cat# Citations Images  

Flow Cytometry Permeabilization/Wash Buffer I (1X)

Flow FC005 4
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Flow Cytometry Fixation Buffer (1X)

Flow FC004 3
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Flow Cytometry Fixation & Permeabilization Buffer Kit I

Flow FC009
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Flow Cytometry Fixation/Permeabilization Buffer I (1X)

Flow FC007
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