Immune Complex Formation
Immune Complex Formation - Related Videos
03:45
Formation of Complex Ions
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2020
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
15:39
Studying Organelle Dynamics in B Cells During Immune Synapse Formation
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Cited by 8 •
2019
Herein we describe two approaches to characterize cell polarization events in B lymphocytes during the formation of an IS. The first, involves quantification of organelle recruitment and cytoskeleton rearrangements at the synaptic membrane. The second is a biochemical approach, to characterize changes in composition of the centrosome, which undergoes polarization to the immune synapse.
03:35
Flow Cytometry-Based Analysis of Dendritic Cell Activation Using Immune Complexes
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2025
This video demonstrates a protocol for assessing the activation of dendritic cells using immunoglobulin G (IgG)-coated tumor cells. Dendritic cells internalize the IgG-coated tumor cells, process the tumor antigens, and present them on the surface through MHC-II molecules, along with the co-expression of the costimulatory molecule CD86. These dendritic cells then undergo MHC-II and CD86-targeted immunostaining and flow cytometry analysis to identify their activation state.
01:19
Hypersensitivity Reactions: Immune-Complex Reactions
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2026
Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...
03:06
An In Vitro Technique to Study Inflammasome Complex Formation in Macrophages
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2025
This video demonstrates a technique to study NOD-like receptor family pyrin domain-containing 3 (NLRP3) inflammasome formation in primary macrophages via immunofluorescence. The macrophages are first primed with bacterial lipopolysaccharide (LPS) to upregulate NLRP3 protein expression. Exposing the macrophages to nigericin—a potassium ionophore—leads to the activation of NLRP3 and the formation of inflammasomes, which are visualized via immunofluorescence.
FAQs
The relative concentrations of soluble antigen and antibody determine how extensively individual molecules bind and how large the resulting assemblies become. These differences affect solubility, which in turn influences how complexes are transported, taken up, and cleared. Consequently, changing antigen or antibody abundance can alter the biological handling of the same molecular targets.
Complement proteins and Fc-receptor-bearing phagocytes support the movement and removal of antigen-antibody assemblies. Complement contributes to their processing, while phagocytes recognize antibody-associated structures through Fc receptors and promote uptake. Together, these mechanisms connect molecular recognition with cellular clearance, helping limit the persistence of foreign material in tissues and circulation.
When complexes persist or are not efficiently cleared, they can deposit in tissues and stimulate inflammatory responses. Their biological effect therefore depends not only on antibody binding but also on subsequent transport, uptake, and removal. This provides a mechanistic link between failed clearance and immune-complex diseases, including some forms of glomerulonephritis.
During infection, antibody binding can organize soluble microbial antigens into structures that the immune system more readily transports and removes. Complement proteins and Fc-receptor-bearing phagocytes then support downstream clearance. This combination helps connect antibody recognition with elimination of pathogens or microbial products, rather than leaving antigen recognition as an isolated binding event.
The process provides a framework for understanding how antibodies recognize antigenic epitopes and how those interactions produce measurable antigen-antibody assemblies. In vaccine design, this knowledge helps relate antibody responses to recognition of foreign material. In serological testing, it supports interpretation of antibody-antigen interactions used to detect or characterize immune responses.
Analysis of complex size, solubility, transport, and clearance can help explain why some antigen-antibody assemblies remain persistent or deposit in tissues. In immunology and infection, this perspective supports investigation of inflammatory disease mechanisms, including some forms of glomerulonephritis. It also distinguishes protective removal of microbial products from harmful consequences of inadequate clearance.