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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...
Antigen Processing Pathways01:31

Antigen Processing Pathways

MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
Antibody Actions01:26

Antibody Actions

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...
Antimicrobial Proteins01:23

Antimicrobial Proteins

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...
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

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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Related Experiment Video

Updated: Jun 14, 2026

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion
06:54

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion

Published on: June 15, 2019

The non-classical functions of the classical complement pathway recognition subcomponent C1q.

Annapurna Nayak1, Janez Ferluga, Anthony G Tsolaki

  • 1Centre for Infection, Immunity and Disease Mechanisms, Biosciences, School of Health Sciences and Social Care, Brunel University, Uxbridge, London UB8 3PH, UK.

Immunology Letters
|April 13, 2010
PubMed
Summary
This summary is machine-generated.

Complement C1q, a key part of innate and adaptive immunity, plays diverse roles beyond defense. This molecule influences immune cells, cell processes, and disease pathogenesis, highlighting its broad biological significance.

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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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Measuring Erythrocyte Complement Receptor 1 Using Flow Cytometry
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Measuring Erythrocyte Complement Receptor 1 Using Flow Cytometry

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Last Updated: Jun 14, 2026

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion
06:54

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion

Published on: June 15, 2019

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

Published on: July 18, 2017

Measuring Erythrocyte Complement Receptor 1 Using Flow Cytometry
07:20

Measuring Erythrocyte Complement Receptor 1 Using Flow Cytometry

Published on: May 19, 2020

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • C1q is the recognition subcomponent of the classical complement pathway, bridging innate and adaptive immunity.
  • C1q modulates various immune cells, including dendritic cells, platelets, microglia, and lymphocytes.
  • It is implicated in clearing apoptotic cells and regulating cell processes like differentiation and chemotaxis.

Purpose of the Study:

  • To explore the diverse functions of C1q beyond its classical immune role.
  • To understand C1q's involvement in neurodegenerative diseases, systemic lupus erythematosus, pregnancy, and embryonic development.
  • To investigate the structural and functional basis for C1q's versatility.

Main Methods:

  • Literature review of recent studies on C1q functions.
  • Analysis of C1q's role in various physiological and pathological contexts.
  • Exploration of C1q's molecular structure and receptor interactions.

Main Results:

  • C1q is crucial for modulating immune cell function and clearing cellular debris.
  • Emerging roles in pregnancy, embryonic development, and neurological synapse function are highlighted.
  • C1q's versatility stems from its charge pattern recognition, globular domain modularity, and receptor interactions.

Conclusions:

  • C1q exhibits a wide array of functions, extending beyond its established role in immunity.
  • Its involvement in diverse processes suggests potential therapeutic targets for various diseases.
  • Further research into C1q family members may uncover additional undiscovered functions.