Antigen Presenting Cells
Antigen Presenting Cells - Related Videos
06:57
Development of an Antigen-driven Colitis Model to Study Presentation of Antigens by Antigen Presenting Cells to T Cells
0 Views •
Cited by 9 •
2016
In this antigen-driven colitis model, OT-II CD4+ T cells expressing a red fluorescent protein were adoptively transferred into RAG-/- mice that express a green fluorescent protein in mononuclear phagocytes (MPs). The hosts were challenged with Escherichia coli (E.coli) expressing the ovalbumin protein (OVA) fused to a cyan fluorescent protein (CFP).
02:41
B Cell Activation on an Antigen-Coated Coverslip
0 Views •
2025
This video demonstrates B cell activation in vitro. The process involves antigen interaction with B cell receptors, leading to cytoskeleton remodeling, immune synapse formation, lysosome movement, antigen internalization, processing, and subsequent presentation on MHC molecules for B cell activation.
03:31
Immunological Synapse Formation Between Helper T Cells and Antigen-Presenting Cells
0 Views •
2025
This video demonstrates the in vitro study of immunological synapse formation between an antigen-presenting cell and helper T lymphocytes using a fluorescence microscope. T cell receptors of helper T lymphocytes interact with an antigen-MHC-II complex in antigen-presenting cells and form immunological synapses, followed by secretory vesicle movements toward the synapse, which is visualized by fluorescent microscopy.
01:22
Antigen Presenting Cells
0 Views •
2024
The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body. T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
06:20
An Assay for Cell Cycle Analysis of Antigen-Specific CD8+ T Cells
0 Views •
2025
This video demonstrates an assay to analyze antigen-specific CD8+ T cells in different cell cycle stages. Fluorescently-labeled viable cells are selected using flow cytometry, and the cells in the different cell cycle stages are identified by their DNA content using antibodies against cell proliferation-associated nuclear protein and a nucleic acid stain.
FAQs
Peptide loading creates the molecular display that allows a T-cell receptor to identify a foreign or altered protein fragment. This step connects antigen processing inside an antigen-presenting cell with antigen-specific adaptive immunity. In infection research, examining this sequence helps explain why immune responses target particular pathogens rather than responding uniformly to all foreign material.
Peptide display alone does not provide every signal required for effective T-cell activation. Antigen-presenting cells must also deliver costimulatory signals, which work alongside recognition through the T-cell receptor. This requirement helps regulate whether antigen recognition produces a functional immune response, making costimulation important when studying immune activation and therapies intended to enhance or regulate T-cell activity.
Cytokines provide an additional layer of signaling during antigen presentation. Together with peptide recognition and costimulation, they help shape the resulting T-cell response and connect local immune detection with broader inflammatory activity. Their involvement is especially relevant to studies of pathogen-specific immunity and inflammatory disease, where signaling conditions can affect the character of the response.
The same antigen-presentation system is relevant to both protective immunity and immune tolerance. By linking processed protein fragments with T-cell recognition, antigen-presenting cells help explain how the immune system responds to pathogens while avoiding inappropriate or excessive activity. This dual relevance also connects APC research with inflammatory disease, in which immune regulation becomes an important scientific focus.
Researchers can examine how dendritic cells, macrophages, and B cells internalize pathogen-associated or altered proteins, process them, and present peptide fragments to T lymphocytes. They can then consider the accompanying costimulatory signals and cytokines when interpreting the response. This framework helps explain pathogen-specific immunity and supports investigation of how infections engage adaptive immune defenses.
APCs are relevant to vaccine design because they connect antigen exposure with T-cell activation, including peptide display, costimulation, and cytokine signaling. Their functions also inform therapies that aim to enhance or regulate T-cell activity. In addition, APC biology contributes to infectious disease diagnosis by providing a framework for understanding pathogen-specific immune responses.