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Related Concept Videos

The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
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Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
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Inflammatory Response

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TGF - β Signaling Pathway

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IL-33 Exacerbates Periodontal Disease through Induction of RANKL.

Journal of dental research·2015
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Regulation of delayed-type hypersensitivity to pathogens and alloantigens.

Immunology today·2014
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This letter was sent to Dr Liew, who replied as follows.

Immunology today·2014
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IL-33 targeting attenuates intestinal mucositis and enhances effective tumor chemotherapy in mice.

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An interleukin-33/ST2 signaling deficiency reduces overt pain-like behaviors in mice.

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Related Experiment Video

Updated: May 23, 2026

A Strategy for the Study of IL-9-Producing Lymphoid Cells in the Nippostrongylus brasiliensis Infection Model
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A Strategy for the Study of IL-9-Producing Lymphoid Cells in the Nippostrongylus brasiliensis Infection Model

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IL-33: a Janus cytokine.

F Y Liew1

  • 1Institute of Infection, Immunity and Inflammation, University of Glasgow, 120, University Place, Glasgow G12 8TA, UK. foo.liew@glasgow.ac.uk

Annals of the Rheumatic Diseases
|March 31, 2012
PubMed
Summary

Interleukin 33 (IL-33) enhances host defense against infections like Trichuris and sepsis. However, this immune mediator also exacerbates conditions such as allergies and arthritis, highlighting its dual role.

Area of Science:

  • Immunology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Interleukin 33 (IL-33) is a cytokine belonging to the IL-1 family.
  • IL-33 binds to the ST2 receptor, primarily found on Th2 cells and mast cells.
  • IL-33 influences T-cell polarization, shifting from Th1 to Th2 phenotypes.

Purpose of the Study:

  • To investigate the role of IL-33 in host defense mechanisms.
  • To explore the impact of IL-33 on various inflammatory and infectious conditions.
  • To evaluate the therapeutic potential and risks associated with IL-33 modulation.

Main Methods:

  • Analysis of IL-33 gene expression during nematode infection (Trichuris muris).
  • Assessment of IL-33 treatment effects on resistance to Trichuris infection.

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  • Evaluation of IL-33's role in sepsis models and atherosclerosis.
  • Investigation of IL-33's influence on allergic responses and arthritis.
  • Main Results:

    • IL-33 mRNA is upregulated early in Trichuris muris infection.
    • IL-33 administration enhances resistance to Trichuris infection and attenuates sepsis.
    • IL-33 reduces atherosclerosis and adipocyte inflammation by inducing type II cytokines.
    • Conversely, IL-33 exacerbates allergic reactions and arthritis.

    Conclusions:

    • IL-33 plays a conserved role in host defense against infections.
    • IL-33 exhibits context-dependent effects, acting as a double-edged sword.
    • Targeting IL-33 requires careful consideration due to its potential to exacerbate certain inflammatory conditions.