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Determination of Regulatory T Cell Subsets in Murine Thymus, Pancreatic Draining Lymph Node and Spleen Using Flow Cytometry
Published on: February 27, 2019
Simultaneous analysis of immunophenotype and apoptosis of murine thymocytes by single laser flow cytometry
A B Lyons1, K Samuel, A Sanderson
1Immunobiology Unit, University of Edinburgh, Scotland.
Insights
Researchers developed a new flow cytometry method to study early apoptosis in thymocytes. This technique confirmed that specific thymocyte populations undergo programmed cell death when exposed to glucocorticoids.
Area of Science:
- Immunology
- Cell Biology
- Developmental Biology
Background:
- Understanding thymocyte development is crucial for immune system function.
- Apoptosis, or programmed cell death, plays a key role in eliminating unwanted cells during development.
- Previous methods lacked the ability to directly identify early apoptotic thymocytes, hindering research.
Purpose of the Study:
- To develop and apply a novel method for direct immunophenotyping of early apoptotic thymocytes.
- To investigate the susceptibility of specific thymocyte subsets to apoptosis induced by glucocorticoids.
Main Methods:
- Utilized single-laser flow cytometry for simultaneous detection of apoptosis and cell phenotype.
- Employed Ethidium Bromide (EBr) staining to identify early apoptotic cells (faint staining).
- Used FITC-labelled antibodies for cell surface marker analysis (e.g., CD4, CD8, CD3).
Main Results:
- Successfully identified a distinct cell population in the early phase of apoptosis.
- Demonstrated that CD4+ CD8+ CD3low/CD3intermediate thymocytes undergo apoptosis in vitro.
- Confirmed that glucocorticoid treatment effectively induces apoptosis in these specific thymocytes.
Conclusions:
- The developed flow cytometry technique enables direct analysis of early apoptotic thymocytes.
- Glucocorticoids induce apoptosis in a specific subset of developing thymocytes.
- This finding advances the understanding of apoptosis regulation during thymocyte maturation.
Abstract:
The study of the role of apoptosis in thymocyte development has been hampered by the lack of a means of directly immunophenotyping cells undergoing the early phase of apoptosis. This restriction has been overcome by single laser flow cytometry in which apoptosis is detected by Ethidium Bromide (EBr) staining and cell phenotype by binding of FITC-labelled antibody. The initial phase of apoptosis is observed as a cell population that stains faintly with EBr preceding the characteristically bright EBr-staining normally associated with cell death. Here we directly demonstrate using single laser flow cytometry that CD4+ CD8+ CD3low/CD3intermediate thymocytes undergo apoptosis in vitro in response to glucocorticoid treatment.
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