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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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Antimicrobial Proteins01:23

Antimicrobial Proteins

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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.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
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Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

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Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
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Antibody Actions01:26

Antibody Actions

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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.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
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Inflammatory Response01:28

Inflammatory Response

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
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Humoral Immune Responses01:36

Humoral Immune Responses

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Overview
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Related Experiment Video

Updated: Mar 31, 2026

High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment
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High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

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Complement activation, regulation, and molecular basis for complement-related diseases.

Goran Bajic1, Søren E Degn2, Steffen Thiel3

  • 1Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.

The EMBO Journal
|October 23, 2015
PubMed
Summary
This summary is machine-generated.

The complement system, crucial for innate immunity, defends against pathogens and maintains homeostasis. Recent research reveals new roles and molecular mechanisms, including intracellular functions and interactions with other systems.

Keywords:
complementinflammationinnate immunityproteolytic regulationstructural biology

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Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • The complement system is a key part of innate immunity, activating against pathogens and abnormal cells.
  • It initiates a cascade to eliminate threats and recruit immune cells, aiding in homeostasis and preventing autoimmunity.

Purpose of the Study:

  • To provide an integrated and updated view of the complement system.
  • To describe new roles and intricate molecular mechanisms of complement activation.
  • To rationalize genetic defects based on structural and mechanistic understanding.

Main Methods:

  • Review of recent functional and structural studies on complement.
  • Analysis of complement's molecular mechanisms and downstream events.
  • Integration of data on complement's cross-talk with other biological systems.

Main Results:

  • Demonstration of autocrine complement signaling in intracellular vesicles.
  • Identification of cytoplasmic receptors for detecting complement-opsonized pathogens.
  • Elucidation of molecular mechanisms underlying complement activation and its interactions.

Conclusions:

  • Complement plays multifaceted roles beyond extracellular defense, including intracellular signaling.
  • Structural and functional insights are crucial for understanding complement's complex functions.
  • Mechanistic understanding aids in explaining genetic defects related to complement dysregulation.