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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...
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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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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Hypersensitivity Reactions: Cytolytic Reactions01:01

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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...

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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

Humoral pattern recognition and the complement system.

S E Degn1, S Thiel

  • 1Department of Biomedicine, Aarhus University, Aarhus, Denmark. sdegn@microbiology.au.dk

Scandinavian Journal of Immunology
|May 16, 2013
PubMed
Summary
This summary is machine-generated.

The complement system uses pattern recognition molecules to distinguish microbes from self. This review details these molecules and proposes a new model for lectin pathway activation in innate immunity.

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Pattern recognition is crucial for immune responses, differentiating self from non-self or harmful agents.
  • Evolutionarily conserved microbial patterns are recognized by innate immune receptors like Toll-like receptors and the complement system.
  • The complement system, a proteolytic cascade, is central to innate immunity and bridges with adaptive responses.

Purpose of the Study:

  • To review pattern recognition molecules (PRMs) involved in complement activation.
  • To examine PRMs with no or unknown complement-activating capacity.
  • To propose a novel model for the mechanism of pattern recognition complexes in complement activation, particularly the lectin pathway.

Main Methods:

  • Literature review of PRMs and complement activation pathways.
  • Analysis of the composition of pattern recognition complexes.
  • Synthesis of recent evidence to support a new mechanistic model.

Main Results:

  • Identification and characterization of PRMs that trigger complement.
  • Exploration of related molecules lacking complement-activating function.
  • Detailed examination of lectin pathway PRM complexes.

Conclusions:

  • Pattern recognition molecules are key to initiating complement-mediated immunity.
  • A new model for lectin pathway activation offers insights into innate immune recognition.
  • Understanding these mechanisms is vital for innate and adaptive immune modulation.