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A sensitive method for detecting proliferation of rare autoantigen-specific human T cells
Stuart I Mannering1, Jessica S Morris, Kent P Jensen
1Autoimmunity and Transplantation Division, The Walter and Eliza Hall Institute, Royal Melbourne Hospital, Parkville, Victoria 3050, Australia. mannering@wehi.edu.au
Journal of Immunological Methods
|December 9, 2003
Summary
A new assay using 5,6-carboxylfluorescein diacetate succinimidyl ester (CFSE) allows sensitive detection of rare T-cell proliferation. This method surpasses older techniques for evaluating cellular immune function and identifying specific T-cell responses.
Area of Science:
- Immunology
- Cellular Biology
- Biotechnology
Background:
- Measuring antigen-specific T-cell proliferation is crucial for assessing immune function.
- Traditional methods like 3H-thymidine incorporation lack sensitivity and do not identify cell phenotypes.
- Rare autoantigen-specific T cells are particularly difficult to detect with existing assays.
Purpose of the Study:
- To develop a novel, sensitive assay for measuring antigen-specific human T-cell proliferation.
- To overcome the limitations of traditional proliferation assays in detecting rare T cells.
- To enable direct phenotypic identification of proliferating T cells.
Main Methods:
- Peripheral blood mononuclear cells (PBMC) were labeled with the fluorescent dye 5,6-carboxylfluorescein diacetate succinimidyl ester (CFSE).
- Proliferation was assessed by measuring the reduction in CFSE intensity via flow cytometry.
- The assay was compared to 3H-thymidine incorporation for sensitivity and phenotypic analysis.
Main Results:
- The CFSE assay demonstrated higher sensitivity compared to 3H-thymidine incorporation.
- It detected proliferation of rare antigen-specific CD4(+) T cells at 10-fold lower antigen concentrations.
- The assay allowed direct determination of the phenotype of proliferating T cells.
Conclusions:
- The CFSE assay provides a sensitive and direct method for measuring antigen-specific T-cell proliferation.
- This technique is valuable for evaluating cellular immune responses, especially in detecting rare T cells.
- The assay successfully measured proliferation of CD4(+) T cells in response to type 1 diabetes autoantigens.