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Related Concept Videos

Complement System01:27

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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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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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Related Experiment Video

Updated: Apr 22, 2026

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

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Complement activation.

E J Brown1, M M Frank

  • 1Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20205 U.S.A.

Immunology Today
|October 8, 2014
PubMed
Summary
This summary is machine-generated.

The complement system, crucial for immune responses, can be activated via classical and alternative pathways. This review explores these activation methods and their significant biological impacts.

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Area of Science:

  • Immunology
  • Biochemistry

Background:

  • The complement system is a vital part of innate immunity.
  • It comprises serum proteins that trigger inflammatory responses.
  • Dysregulation is linked to various diseases.

Purpose of the Study:

  • To review the activation mechanisms of the complement system.
  • To discuss the biological consequences of complement activation.
  • To provide an overview for researchers in immunology and related fields.

Main Methods:

  • Literature review of complement activation pathways.
  • Synthesis of information on classical and alternative pathways.
  • Discussion of documented biological effects.

Main Results:

  • Detailed explanation of the classical complement pathway.
  • Detailed explanation of the alternative complement pathway.
  • Summary of key biological outcomes, including inflammation and pathogen clearance.

Conclusions:

  • Complement activation is a complex process with diverse biological roles.
  • Understanding these pathways is critical for therapeutic development.
  • Further research is needed to fully elucidate all complement functions.