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Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

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Interleukin-33 in allergy.

Tatsukuni Ohno1, Hideaki Morita, Ken Arae

  • 1Department of Molecular Immunology, Graduate School of Medical and Dental Science, Tokyo Medical and Dental University, Tokyo, Japan.

Allergy
|August 24, 2012
PubMed
Summary
This summary is machine-generated.

Interleukin-33 (IL-33) is crucial for host defense against nematodes by promoting Th2 cytokines. However, its dysregulation contributes to allergic and autoimmune diseases, acting as an alarmin released during tissue injury.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Interleukin-33 (IL-33) belongs to the IL-1 cytokine family.
  • It signals through a heterodimeric receptor comprising IL-1 receptor-like 1 (IL-1RL1/ST2) and IL-1 receptor accessory protein (IL-1RAcP).
  • IL-33 is implicated in host defense, particularly against nematodes, by inducing Th2 cytokine production.

Purpose of the Study:

  • To review the multifaceted roles of IL-33 in cellular functions.
  • To elucidate the involvement of IL-33 in the pathogenesis of allergic diseases.
  • To summarize current knowledge on IL-33's biological activities and disease relevance.

Main Methods:

  • Literature review of existing research on IL-33.
  • Analysis of IL-33's signaling pathways and cellular localization.
  • Examination of IL-33's contribution to inflammatory and immune responses.

Main Results:

  • IL-33 acts as an alarmin, released from damaged cells during necrosis, unlike inflammasome-dependent cytokines.
  • Its nuclear localization and release mechanism differ from IL-1β and IL-18.
  • Excessive or inappropriate IL-33 production is linked to allergic and autoimmune disorders.

Conclusions:

  • IL-33 plays a dual role in immunity, essential for host defense but also pathogenic in allergic conditions.
  • Understanding IL-33's alarmin function is key to comprehending its role in tissue injury and inflammation.
  • Further research into IL-33 pathways may offer therapeutic targets for allergies and autoimmune diseases.