Cd8 Positive Cells
Cd8 Positive Cells - Related Videos
06:08
Generating Single Positive CD8 T Cells from Induced Pluripotent Stem Cells
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2025
This video demonstrates an assay to generate tumor antigen-specific induced pluripotent stem cell (iPSC)-derived CD8αβ+ T Cells. Tumor antigen-specific iPSCs are grown on a stromal cell monolayer and differentiated into hematopoietic progenitor cells (HPCs). The HPCs are differentiated into CD4+ CD8+ double-positive T cells using a differentiation medium. These cells are then stimulated to generate single-positive T cells expressing CD8.
06:20
An Assay for Cell Cycle Analysis of Antigen-Specific CD8+ T Cells
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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.
05:41
Nanoparticle-Based Enrichment and Expansion of Antigen-Specific CD8+ T Cells
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2025
This video describes a protocol for isolating rare-antigen-specific CD8+ T cells using magnetic nanoparticle-based artificial antigen-presenting cells (aAPCs) functionalized with antigenic peptide-loaded MHC-Igs and anti-CD28 antibodies. Interaction of the aAPCs with CD8+ T cells specifically expressing the antigenic peptide-targeting T cell receptors, followed by their expansion in vitro, results in the enrichment and expansion of this CD8+ T cell population.
05:04
An In Vitro Assay for Studying the Cytotoxicity of Pre-Activated CD8+ T Cells against Cancer Cells
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2025
This video showcases an apoptosis assay in cancer cells induced by pre-activated effector T cells. By co-culturing these cells with cancer cells marked with fluorescent nuclei, a caspase-cleavable fluorogenic substrate is added. Apoptotic cancer cells will display a different color in their nuclei, leading to dual fluorescence. This dual fluorescence is indicative of cancer cells undergoing apoptosis.
09:48
In Vitro Resident Memory CD8 T Cell Differentiation Using Epithelial Organoid-T Cell Co-culture System
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2026
To study CD8 T cell differentiation and function in vitro, CD8 T cells can be isolated from the mouse to be co-cultured long-term with preformed infected murine vaginal epithelial organoids. Here, we describe this process and assess the acquisition of resident memory T cell markers upon co-culture.
FAQs
The CD8 co-receptor supports the interaction between a cytotoxic T lymphocyte and major histocompatibility complex class I molecules on a target cell. This stabilization helps the T cell evaluate whether the displayed peptide antigen is compatible with its immune response. The interaction is therefore important for directing cellular immunity toward infected or abnormal cells rather than unrelated targets.
Recognition can activate the cell and initiate several coordinated responses. CD8 positive cells may release perforin and granzymes, molecules that contribute to target-cell death, while also producing signaling molecules that influence other immune activities. These responses connect antigen recognition with elimination of affected cells and broader regulation of the surrounding immune response.
The number of CD8 positive cells indicates their abundance in a biological sample or tissue, whereas activity concerns what those cells do after relevant antigen recognition. A population may therefore be examined for both presence and functional responses, including target-cell killing mechanisms or signaling-molecule production. Considering both dimensions gives a more informative view of cellular immunity.
Major histocompatibility complex class I molecules present peptide antigens from infected or abnormal cells, creating a basis for immune recognition. When a displayed peptide is compatible with a CD8 T-cell response, the cell can become activated and contribute to target-cell death. This mechanism links cellular immunity with surveillance for conditions that alter normal cellular status.
Researchers study their abundance and activity to characterize cellular immune responses in different biological settings. Measurements can help indicate whether these cells are present and whether they show functions associated with antigen recognition, target-cell death, or signaling. Such information supports investigation of infection, cancer, transplantation, and autoimmune disease without relying on cell counts alone.
CD8 positive cells are examined across infection, cancer, transplantation, and autoimmune disease because each setting can involve altered cellular immunity. Their abundance and activity may provide information about how immune responses are organized or changed in these conditions. They are also considered potential targets for immune monitoring and therapy, linking basic biology with translational research.