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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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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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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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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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Related Experiment Video

Updated: Dec 29, 2025

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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Utilization of complement receptors in immune cell-microbe interaction.

Szilvia Lukácsi1, Bernadett Mácsik-Valent1, Zsuzsa Nagy-Baló2

  • 1MTA-ELTE Immunology Research Group, Eötvös Loránd University, Budapest, Hungary.

FEBS Letters
|January 29, 2020
PubMed
Summary
This summary is machine-generated.

The complement system aids immunity by eliminating pathogens through direct lysis or opsonization for phagocytosis. Immune cells use complement receptors to clear microbes, while pathogens exploit them to evade the host response.

Keywords:
complement activationcomplement receptorscomplement-derived ligandspathogen clearancepathogen escape

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Area of Science:

  • Immunology
  • Microbiology

Background:

  • The complement system is crucial for innate and adaptive immunity, facilitating rapid pathogen elimination.
  • It acts via direct lysis through the membrane attack complex or opsonization for phagocytosis.

Purpose of the Study:

  • To review the mechanisms of complement-mediated pathogen clearance.
  • To discuss the dual role of complement receptors in host defense and pathogen evasion.

Main Methods:

  • Literature review of complement system function in immunity.
  • Analysis of complement components (C1q, MBL, C3 fragments) and their receptors.

Main Results:

  • Complement components like C1q, MBL, and C3 fragments act as opsonins.
  • Immune cells utilize complement receptors to bind opsonized pathogens.
  • Pathogens can hijack complement receptors to evade immune detection.

Conclusions:

  • The complement system is a versatile defense mechanism against pathogens.
  • Complement receptors play a critical role in both pathogen clearance and pathogen evasion strategies.