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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...
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Humoral Immune Responses

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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.
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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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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
06:29

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

Published on: January 29, 2014

Complement activation by (auto-) antibodies.

Nina A Daha1, Nirmal K Banda, Anja Roos

  • 1Department of Rheumatology, Leiden University Medical Center, Leiden, The Netherlands.

Molecular Immunology
|July 16, 2011
PubMed
Summary
This summary is machine-generated.

Antibodies, including IgA, IgG, and IgM, activate the complement system through various pathways. Understanding these interactions is crucial for managing autoimmune diseases and optimizing antibody therapies.

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In Vitro Methods for Comparing Target Binding and CDC Induction Between Therapeutic Antibodies: Applications in Biosimilarity Analysis
07:25

In Vitro Methods for Comparing Target Binding and CDC Induction Between Therapeutic Antibodies: Applications in Biosimilarity Analysis

Published on: May 4, 2017

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • The complement system is vital for innate immunity, clearing pathogens and apoptotic cells.
  • Immunoglobulin G (IgG) and Immunoglobulin M (IgM) classically activate complement via C1q binding to Fc regions.
  • Emerging research highlights IgA's role in complement activation and antibodies' involvement in alternative and lectin pathways.

Purpose of the Study:

  • To review complement activation by antibodies across different pathways.
  • To explore the role of auto-antibodies in complement-mediated damage.
  • To discuss antibodies targeting complement components in disease.

Main Methods:

  • Literature review of complement activation mechanisms.
  • Analysis of antibody interactions with complement pathways.
  • Discussion of disease implications and therapeutic strategies.

Main Results:

  • Antibodies, including IgA, IgG, and IgM, activate complement via classical, alternative, and lectin pathways.
  • Auto-antibodies can trigger alternative pathway activation, leading to cell lysis and tissue damage.
  • Auto-antibodies against complement components are implicated in vascular diseases.

Conclusions:

  • Antibody-mediated complement activation is complex and pathway-dependent.
  • Understanding these interactions is key for therapeutic interventions in autoimmune and vascular diseases.
  • Targeting antibody-complement interactions offers potential for disease management.