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Related Concept Videos

Complement System01:27

Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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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...
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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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Related Experiment Video

Updated: Mar 8, 2026

Detection of Inflammasome Activation and Pyroptotic Cell Death in Murine Bone Marrow-derived Macrophages
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Heparin-induced thrombocytopenia immune complexes activate the inflammasome pathway in a complement-dependent manner.

James V Michael1, Sanjay Khandelwal2, Antonios Tawk1

  • 1The Cardeza Foundation for Hematologic Research, Center for Hemostasis, Thrombosis and Vascular Biology, Department of Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania, USA.

Journal of Thrombosis and Haemostasis : JTH
|March 6, 2026
PubMed
Summary

Heparin-induced thrombocytopenia (HIT) involves immune complexes activating the inflammasome pathway. This leads to IL-1β secretion, a key factor in HIT pathology, dependent on FcγRIIA and complement activation.

Keywords:
heparin-induced thrombocytopeniainflammasomethrombocytopeniathrombosis

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Area of Science:

  • Immunology
  • Hematology
  • Pharmacology

Background:

  • Heparin-induced thrombocytopenia (HIT) is an adverse drug reaction triggered by IgG antibodies against platelet factor 4 (PF4)/heparin complexes.
  • These immune complexes (ICs) activate FcγRIIA receptors, promoting prothrombotic signaling and cytokine release.

Purpose of the Study:

  • To investigate the role of inflammasome activation and IL-1β release in HIT.
  • To elucidate the mechanisms underlying HIT pathogenesis involving FcγRIIA, complement, and inflammasome pathways.

Main Methods:

  • Assessed IL-1β secretion in whole blood and PBMCs challenged with HIT ICs or patient plasma.
  • Utilized FcγRIIA, complement, and NLRP3 inflammasome inhibitors to determine pathway requirements.
  • Employed FcγRIIA transgenic mice lacking Nlrp3 in a thrombosis model.

Main Results:

  • HIT ICs significantly increased IL-1β secretion in a FcγRIIA-dependent manner.
  • IL-1β release required complement activation and was reduced by the NLRP3 inhibitor MCC950.
  • Nlrp3 was essential for severe thrombocytopenia and thrombosis in a mouse model.

Conclusions:

  • HIT ICs activate the inflammasome pathway via FcγRIIA and complement.
  • IL-1β secretion is a critical mediator of HIT pathology.
  • Targeting the inflammasome pathway may offer therapeutic strategies for HIT.