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Related Concept Videos

Complement System01:27

Complement System

2.8K
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...
2.8K
Antimicrobial Proteins01:23

Antimicrobial Proteins

6.0K
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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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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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.
Phagocytes
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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Complementation Tests00:49

Complementation Tests

5.2K
A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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Antibody Actions01:26

Antibody Actions

1.4K
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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What is the Immune System?01:38

What is the Immune System?

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Overview
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Related Experiment Video

Updated: Sep 16, 2025

Depletion of Specific Cell Populations by Complement Depletion
06:17

Depletion of Specific Cell Populations by Complement Depletion

Published on: February 5, 2010

22.3K

The Complement System.

Margot Revel1, Alessandra Zarantonello1, Lubka T Roumenina2

  • 1Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université de Paris, Paris, France.

Advances in Experimental Medicine and Biology
|July 7, 2025
PubMed
Summary
This summary is machine-generated.

The complement system is a vital part of innate immunity, defending against pathogens and maintaining health. Understanding its complex functions is key to understanding host defense and disease.

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Last Updated: Sep 16, 2025

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Area of Science:

  • Immunology
  • Infectious Disease

Background:

  • The complement system is a crucial part of the innate immune system.
  • It plays a vital role in defending against pathogens and maintaining homeostasis.
  • Dysregulation of the complement system can lead to severe organ damage.

Purpose of the Study:

  • To highlight the multifaceted roles of the complement system in host defense.
  • To emphasize the importance of understanding complement function in both health and disease.

Main Methods:

  • This abstract is a review of the known functions of the complement system.
  • It synthesizes information from existing literature on complement biology.

Main Results:

  • Complement facilitates pathogen opsonization for phagocytosis.
  • It generates inflammatory mediators to recruit immune cells.
  • It directly kills gram-negative bacteria via membrane attack.

Conclusions:

  • The complement system is essential for innate immunity and homeostasis.
  • Deficiencies in complement components increase infection susceptibility.
  • Understanding complement is critical for comprehending host defense and pathology.