Positive Cell Selection
Positive Cell Selection - Related Videos
14:29
Examination of Thymic Positive and Negative Selection by Flow Cytometry
0 Views •
Cited by 22 •
2012
We present a flow cytometry-based method to examine T cell development in vivo using genetically manipulated mice on a wildtype or T cell receptor transgenic background.
12:19
Analysis of Cell Cycle Position in Mammalian Cells
0 Views •
Cited by 71 •
2012
Determining the cell cycle position of a population of cells, or understanding how signals affect proliferation, can be readily measured by flow cytometry using this protocol. We report a simple experimental approach to staining cells and quantifying their position in the cell cycle.
06:08
Generating Single Positive CD8 T Cells from Induced Pluripotent Stem Cells
0 Views •
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.
02:32
Position-effect Variegation
0 Views •
2020
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
01:22
T Cell Activation and Clonal Selection
0 Views •
2024
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...
FAQs
The decisive variable is whether the desired cells display the surface characteristic recognized by the antibody. Antibody-coated magnetic beads bind the corresponding antigen, creating a physical label on those cells. Enrichment therefore depends on selecting a marker associated with the population of interest, such as a marker used to identify T cells, B cells, or monocytes.
Magnetic separation uses the difference between bead-labeled and unlabeled cells. Cells carrying antibody-bound beads are retained when the sample is exposed to the magnetic field, whereas cells without the recognized antigen are removed. This physical partition concentrates the marked population and produces a cell fraction suitable for subsequent collection, analysis, or culture.
Direct capture links cell isolation to a measurable surface feature rather than to the sample’s overall composition. That connection allows investigators to enrich a defined immune population from a complex mixture and then examine its behavior separately. The resulting preparation can support more focused studies of immune responses, host-pathogen interactions, and immune regulation.
A typical workflow begins with a complex cell sample and antibodies attached to magnetic beads. The antibodies bind the antigen on the desired population, after which magnetic separation retains the labeled cells and removes unlabeled cells. Researchers then collect the retained fraction for analysis or culture, depending on the experimental objective.
The method can enrich several immune populations when they carry an appropriate characteristic surface marker. The overview specifically identifies T cells, B cells, and monocytes as examples, while also noting that other immune populations may be selected. This flexibility makes the approach useful for working with varied immunological samples rather than a single cell type.
Selected immune cells provide a more focused material for investigating host-pathogen interactions and characterizing immune responses. Researchers can also use the enriched populations in functional assays, where the behavior of a defined cell group is examined, or in models of infection and immune regulation. Enrichment helps make these experimental systems more consistent by reducing unwanted cellular complexity.