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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...
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...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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.

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Related Experiment Video

Updated: Jun 3, 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

Complement and non-complement activating functions of C1q: a prototypical innate immune molecule.

Annapurna Nayak1, Lina Pednekar, Kenneth B M Reid

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

Innate Immunity
|April 1, 2011
PubMed
Summary

Complement C1q initiates the classical pathway and recognizes diverse ligands. This review explores C1q

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Last Updated: Jun 3, 2026

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

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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

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Published on: May 19, 2020

Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • C1q is a key initiator of the classical complement pathway.
  • C1q functions as a pattern recognition molecule with broad ligand-binding capabilities.
  • The C1q family encompasses diverse molecules with immune functions.

Purpose of the Study:

  • To review the complement-dependent and independent functions of C1q.
  • To discuss C1q's cognate receptors.
  • To highlight key members of the C1q family.

Main Methods:

  • Literature review of C1q functions and family members.
  • Analysis of C1q structure-function relationships.
  • Summary of C1q-ligand interactions.

Main Results:

  • C1q exhibits versatile recognition of self, non-self, and altered-self ligands.
  • Ligand binding is facilitated by C1q's globular head structure and conformational flexibility.
  • The C1q family is expanding, with diverse roles in innate immunity.

Conclusions:

  • C1q's unique structure enables its broad recognition capabilities.
  • Understanding C1q and its family is crucial for innate immunity research.
  • C1q plays multifaceted roles beyond complement activation.