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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...
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...
Activation of Integrins01:15

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
Complementation Tests00:49

Complementation Tests

A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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...

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Related Experiment Video

Updated: May 31, 2026

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

Material properties in complement activation.

S Moein Moghimi1, Alina J Andersen, Davoud Ahmadvand

  • 1Centre for Pharmaceutical Nanotechnology and Nanotoxicology, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark. momo@farma.ku.dk

Advanced Drug Delivery Reviews
|June 22, 2011
PubMed
Summary

Uncontrolled complement activation by nanomaterials can cause adverse reactions. Understanding how material properties influence this complex interaction is key for safer nanomedicine design.

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Measuring the 50% Haemolytic Complement (CH50) Activity of Serum
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Last Updated: May 31, 2026

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

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Measuring the 50% Haemolytic Complement (CH50) Activity of Serum
08:26

Measuring the 50% Haemolytic Complement (CH50) Activity of Serum

Published on: March 29, 2010

Area of Science:

  • Nanomedicine
  • Immunology
  • Materials Science

Background:

  • Uncontrolled complement activation leads to inflammatory and life-threatening conditions.
  • The role of complement in adverse reactions to polymers and nanoparticulate drug carriers is a growing area of research.
  • Structure-immune performance relationship studies are crucial in nanomedicine.

Purpose of the Study:

  • To investigate the complex interaction between nanomaterials and the complement system.
  • To understand how material properties influence complement activation.
  • To provide a mechanistic basis for improved nanomedicine design.

Main Methods:

  • Review of existing literature on nanomaterial-complement interactions.
  • Analysis of factors influencing complement activation (size, morphology, surface characteristics).
  • Discussion of sensing molecules and initiation pathways involved.

Main Results:

  • Nanomaterial properties like size, morphology, and surface characteristics significantly impact complement activation.
  • Different material parameters can trigger complement via distinct pathways and sensing molecules.
  • The interaction is complex and regulated by multiple interrelated factors.

Conclusions:

  • Mechanistic understanding of complement activation by nanomaterials is essential.
  • This knowledge can guide rational design of safer and more effective nanomedicine.
  • Improved material design and nanoengineering strategies can enhance clinical applications.