Antibody-mediated Immunity
Antibody-mediated Immunity - Related Videos
02:55
Quantification of Immune Mediator Levels in Human Mucosal Lining Fluid
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2025
This video demonstrates the quantification of immune mediator levels in neonatal human nasal mucosal lining fluid extract. An electrochemiluminescence-based multiplex assay system measures these mediators by evaluating the intensity of emitted light when they are excited.
03:03
Measuring the Activation of Fc-Mediated Effector Functions by HA Antibodies
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2025
This video demonstrates an assay measuring the antibody-mediated activation of T cell effector functions. Adding an influenza virus hemagglutinin (HA)-specific monoclonal antibody to transfected mammalian cells expressing HA results in the formation of immune complexes with HA. Upon introducing engineered T cells expressing Fc receptors and a luciferase reporter, the T cells are activated by the antibody-HA complexes, and this activation is detected by adding a luciferase substrate and...
04:47
A Method to Assess Fc-mediated Effector Functions Induced by Influenza Hemagglutinin Specific Antibodies
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Cited by 6 •
2018
We describe a method to measure the activation of Fc-mediated effector functions by antibodies that target the influenza virus hemagglutinin. This assay can also be adapted to assess the ability of monoclonal antibodies or polyclonal sera targeting other viral surface glycoproteins to induce Fc-mediated immunity.
01:40
Cell-mediated Immune Responses
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2025
Overview The cell-mediated immune system is the host’s primary response against invasive bacteria and viruses that cause intracellular infections. It is also essential for fighting against and destroying cancer cells. Furthermore, the cell-mediated immune system plays a role in the rejection of organ transplants or graft tissue. The Innate Immune System Activates the Adaptive Immune System Phagocytic cells of the innate immune system, such as macrophages or dendritic cells, are the first to...
01:10
Antibody Structure
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2019
Overview Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding. The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains Antibodies consist of four polypeptide chains: two identical heavy...
FAQs
Antigen exposure activates selected B cells whose receptors recognize the foreign target. These cells can differentiate into plasma cells, the antibody-secreting population, or memory B cells that persist for later encounters. This division of outcomes links immediate pathogen control with longer-term immune readiness and explains why the response is both specific and adaptive.
These antibody actions limit pathogens through different mechanisms. Neutralization blocks toxins or viruses from attaching to host cells, while opsonization tags microbes so phagocytes can recognize and engulf them more effectively. Antibodies can also activate complement proteins, adding a protein-mediated pathway that promotes pathogen destruction. Together, these mechanisms broaden the protective outcome.
Memory B cells preserve information from an earlier antigen exposure and support a faster, stronger response when the same target appears again. This capacity gives antibody-mediated immunity a lasting adaptive feature rather than limiting protection to the initial infection. It also provides the biological basis for using vaccination to establish future immune readiness.
Vaccination relies on the response's ability to generate immunological memory after antigen exposure. Memory B cells can support a faster and stronger reaction during a later encounter with the relevant pathogen. Antibody-mediated immunity therefore connects an earlier controlled exposure with improved future protection, making memory formation a central biological principle of vaccination.
Serological testing is grounded in the specific recognition between antibodies and foreign molecules or pathogen-related targets. Because this immune response distinguishes particular antigens, testing can use antibody-related recognition as a biological basis for examining immune status or exposure. The application translates a molecular feature of adaptive immunity into an investigative laboratory context.
Antibody-based therapies apply the same target-specific recognition that allows antibodies to act against foreign molecules or pathogens. Depending on the target and antibody activity, relevant effects may include blocking attachment, marking a microbe for phagocytosis, or promoting complement-mediated destruction. This makes humoral immune mechanisms useful as a foundation for therapeutic approaches.