• Product nameAnti-IL33 antibody
    See all IL33 primary antibodies
  • Description
    Rabbit polyclonal to IL33
  • Tested applicationsSuitable for: ELISA, WB, IHC-Pmore details
  • Species reactivity
    Reacts with: Human
    Predicted to work with: Mouse, Rat
  • Immunogen

    Synthetic peptide conjugated to KLH, corresponding to 19 amino acids near the centre of Human IL33 (NP_254274.1).

  • Positive control
    • Human lymph node lysate and uterus tissue.



Our Abpromise guarantee covers the use of ab118503 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
ELISA Use at an assay dependent concentration.
WB Use a concentration of 1 µg/ml. Predicted molecular weight: 31 kDa.
IHC-P Use a concentration of 5 µg/ml. Perform heat mediated antigen retrieval with citrate buffer pH 6 before commencing with IHC staining protocol.


  • FunctionCytokine that binds to and signals through the IL1RL1/ST2 receptor which in turn activates NF-kappa-B and MAPK signaling pathways in target cells (PubMed:16286016). Involved in the maturation of Th2 cells inducing the secretion of T-helper type 2-associated cytokines. Also involved in activation of mast cells, basophils, eosinophils and natural killer cells. Acts as a chemoattractant for Th2 cells, and may function as an "alarmin", that amplifies immune responses during tissue injury (PubMed:17853410, PubMed:18836528).
    In quiescent endothelia the uncleaved form is constitutively and abundantly expressed, and acts as a chromatin-associated nuclear factor with transcriptional repressor properties, it may sequester nuclear NF-kappaB/RELA, lowering expression of its targets (PubMed:21734074). This form is rapidely lost upon angiogenic or proinflammatory activation (PubMed:18787100).
  • Tissue specificityExpressed at high level in high endothelial venules found in tonsils, Peyer patches and mesenteric lymph nodes. Almost undetectable in placenta.
  • Sequence similaritiesBelongs to the IL-1 family. Highly divergent.
  • DomainThe homeodomain-like HTH domain mediates nuclear localization and heterochromatin association.
  • Post-translational
    The full length protein can be released from cells and is able to signal via the IL1RL1/ST2 receptor. However, proteolytic processing by CSTG/cathepsin G and ELANE/neutrophil elastase produces C-terminal peptides that are more active than the unprocessed full length protein. May also be proteolytically processed by calpains (PubMed:19596270). Proteolytic cleavage mediated by apoptotic caspases including CASP3 and CASP7 results in IL33 inactivation (PubMed:19559631). In vitro proteolytic cleavage by CASP1 was reported (PubMed:16286016) but could not be confirmed in vivo (PubMed:19465481) suggesting that IL33 is probably not a direct substrate for that caspase.
  • Cellular localizationNucleus. Chromosome. Cytoplasmic vesicle, secretory vesicle. Secreted. Associates with heterochromatin and mitotic chromosomes (PubMed:17185418).
  • Information by UniProt
  • Database links
  • Alternative names
    • C9orf26 antibody
    • DKFZp586H0523 antibody
    • DVS27 antibody
    • DVS27 related protein antibody
    • IL 1F11 antibody
    • IL 33 antibody
    • IL-1F11 antibody
    • IL-33 antibody
    • IL1F11 antibody
    • IL33 antibody
    • IL33_HUMAN antibody
    • Interleukin 1 family member 11 antibody
    • Interleukin 33 antibody
    • INTERLEUKIN 33 NFHEV antibody
    • Interleukin 33 precursor antibody
    • Interleukin-1 family member 11 antibody
    • Interleukin-33 (109-270) antibody
    • Interleukin33 antibody
    • NF HEV antibody
    • NF-HEV antibody
    • NFEHEV antibody
    • NFHEV antibody
    • Nuclear factor for high endothelial venules antibody
    • Nuclear factor from high endothelial venules antibody
    • OTTHUMP00000021041 antibody
    • RP11 575C20.2 antibody
    see all

Anti-IL33 antibody images

  • Immunohistochemical staining of paraffin-embedded, formalin fixed, human tonsil lymphocytes with ab118503 at 5 µg/mL.

  • Negative control - immunohistochemical staining of paraffin-embedded, formalin fixed, human seminiferous tubules with ab118503 at 5 µg/mL.

  • Human Uterus, Vessels (formalin-fixed, paraffin-embedded) stained with IL33 antibody ab118503 at 5 µg/ml followed by biotinylated goat anti-rabbit IgG secondary antibody, alkaline phosphatase-streptavidin and chromogen.
  • Lane 1 : Anti-IL33 antibody (ab118503) at 1 µg/ml
    Lane 2 : Anti-IL33 antibody (ab118503) at 2 µg/ml

    Lane 1 : Human lymph node tissue lysate
    Lane 2 : Human lymph node tissue lysate

    Predicted band size : 31 kDa

References for Anti-IL33 antibody (ab118503)

ab118503 has not yet been referenced specifically in any publications.

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