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Related Concept Videos

Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

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...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
Cross-reactivity00:42

Cross-reactivity

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Antibody Actions01:26

Antibody Actions

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.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
Blood Transfusion and Agglutination02:45

Blood Transfusion and Agglutination

Blood transfusion is a therapeutic measure to restore the blood volume after extensive blood loss due to an accident or a medical procedure. Blood transfusion involves drawing a certain amount of blood from a suitable donor and infusing it into the recipient.
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The history of blood transfusion dates back to the 17th century, when early attempts were made in animals. In 1818 James Blundell, a British doctor, performed the first successful human blood transfusion. Later in 1900, Karl...

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Related Experiment Video

Updated: Jul 3, 2026

In Vitro and In Vivo Assessment of T, B and Myeloid Cells Suppressive Activity and Humoral Responses from Transplant Recipients
18:48

In Vitro and In Vivo Assessment of T, B and Myeloid Cells Suppressive Activity and Humoral Responses from Transplant Recipients

Published on: August 12, 2017

Antibodies, isotypes and complement in allograft rejection.

Georg A Böhmig1, Gregor Bartel, Markus Wahrmann

  • 1Department of Medicine III, Medical University of Vienna, Vienna, Austria. georg.boehmig@meduniwien.ac.at

Current Opinion in Organ Transplantation
|August 8, 2008
PubMed
Summary

Detecting complement-fixing alloantibodies is crucial for identifying harmful sensitization in antibody-mediated rejection. This approach aids in diagnosing allograft injury and predicting graft survival more accurately.

Related Experiment Videos

Last Updated: Jul 3, 2026

In Vitro and In Vivo Assessment of T, B and Myeloid Cells Suppressive Activity and Humoral Responses from Transplant Recipients
18:48

In Vitro and In Vivo Assessment of T, B and Myeloid Cells Suppressive Activity and Humoral Responses from Transplant Recipients

Published on: August 12, 2017

Area of Science:

  • Transplant immunology
  • Complement system biology
  • Diagnostic strategies in transplantation

Background:

  • Classical complement activation is central to antibody-mediated rejection.
  • Alloantibodies play a critical role in initiating this rejection process.
  • Novel diagnostic methods are needed to identify high-risk patients.

Purpose of the Study:

  • To review recent studies on the relevance of complement-fixing alloantibodies.
  • To highlight diagnostic strategies focusing on alloantibody complement-fixing ability.
  • To emphasize the role of complement in antibody-mediated rejection.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of studies investigating C4d deposition as a marker of complement activation.
  • Evaluation of in vitro techniques for detecting complement-fixing antibodies.

Main Results:

  • Capillary C4d deposition correlates strongly with allograft injury.
  • Immunoglobulin isotype distribution may not fully reflect pathogenetic relevance.
  • In vitro C4d detection can distinguish harmful complement-fixing from non-complement-fixing alloreactivities.
  • Complement-fixing HLA antibodies predict antibody-mediated rejection and poor graft survival.

Conclusions:

  • Complement activation is pivotal in antibody-mediated rejection.
  • Technologies identifying complement-fixing alloantibodies are valuable for detecting deleterious sensitization.
  • Selective detection of harmful alloantibody activity can improve transplant outcomes.