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Related Concept Videos

Complement System01:27

Complement System

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 membrane...
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...
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...
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...
Humoral Immune Responses01:36

Humoral Immune Responses

Overview
Cross-reactivity00:42

Cross-reactivity

Overview

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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
06:29

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

Published on: January 29, 2014

Autoantibodies against complement components and functional consequences.

Marie-Agnès Dragon-Durey1, Caroline Blanc, Maria Chiara Marinozzi

  • 1INSERM UMRS 872, Cordeliers Research Center, Paris, France.

Molecular Immunology
|June 25, 2013
PubMed
Summary
This summary is machine-generated.

The complement system, vital for innate immunity, can cause damage if autoantibodies trigger it. This review explores anti-complement autoantibodies, their effects, and clinical relevance.

Keywords:
AutoantibodiesC1qComplementFactor H

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Area of Science:

  • Immunology
  • Innate Immunity
  • Autoimmunity

Background:

  • The complement system is crucial for innate immune defense.
  • Inappropriate activation or autoantibody responses can lead to complement-mediated tissue damage.
  • Autoantibodies targeting complement components, convertases, regulators, and receptors are known.

Purpose of the Study:

  • To review autoantibodies against complement components.
  • To describe their functional consequences.
  • To discuss their clinical relevance.

Main Methods:

  • Literature review of studies on anti-complement autoantibodies.
  • Analysis of functional consequences of these autoantibodies.
  • Correlation of autoantibodies with clinical presentations.

Main Results:

  • Functional consequences are well-documented for some autoantibodies, with clear clinical associations.
  • For other complement-targeting autoantibodies, the relationship with pathology is less clear.
  • Anti-complement autoantibodies can be found in healthy individuals, suggesting a need for a 'second hit' or a natural antibody role.

Conclusions:

  • Autoantibodies against complement components have diverse functional consequences.
  • Their clinical relevance varies, with some linked to disease and others potentially benign.
  • Further research is needed to clarify the role of certain anti-complement autoantibodies in pathology.