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Published on: September 27, 2013
Evaluation of lymphocyte activation by flow cytometric determination of interleukin-2 (CD25) receptor
J L Santos1, M J Montes, M Garcia-Pacheco
1Department of Biochemistry and Molecular Biology, University of Granada, Spain.
Insights
Measuring interleukin-2 receptor (CD25) expression via flow cytometry offers a reliable alternative to [3H]thymidine uptake for assessing T lymphocyte activation by mitogens. This method shows a clear correlation with mitogen dosage, unlike traditional assays.
Area of Science:
- Immunology
- Cellular Biology
- Flow Cytometry
Background:
- Lymphocyte proliferation assays are crucial for immune system evaluation.
- Traditional [3H]thymidine uptake methods for assessing lymphocyte response can be difficult to interpret.
- There is a need for more reliable and interpretable methods to evaluate T lymphocyte activation.
Purpose of the Study:
- To investigate the feasibility of using interleukin-2 receptor (CD25) expression as a marker for T lymphocyte activation.
- To compare CD25 expression measured by flow cytometry with traditional [3H]thymidine uptake assays.
- To determine the correlation between CD25 expression and phytohemagglutinin (PHA) dosage.
Main Methods:
- Flow cytometry was employed to measure the expression of the CD25 molecule on T lymphocytes.
- Interleukin-2 receptor (CD25) expression was quantified following stimulation with mitogens, specifically phytohemagglutinin.
- Results were compared with those obtained from [3H]thymidine uptake assays.
Main Results:
- A strong positive correlation was observed between the level of CD25 molecule expression and the dose of phytohemagglutinin used.
- No significant correlation was found between the disintegrations per minute ([3H]thymidine uptake) and the percentage of CD25 expressed by T lymphocytes.
- Flow cytometry measurement of CD25 expression provides a more interpretable assessment of T lymphocyte activation compared to [3H]thymidine uptake.
Conclusions:
- Measuring interleukin-2 receptor (CD25) expression via flow cytometry is a feasible and reliable alternative for assessing T lymphocyte activation.
- CD25 expression serves as a more accurate indicator of T lymphocyte activation in response to mitogens than [3H]thymidine uptake.
- This flow cytometry-based method offers improved interpretability for immunological evaluations.
Abstract:
Lymphocyte response to mitogens is a habitually-used test in the evaluation of the immune system. The usual method with [3H]thymidine yields results which are difficult to interpret. In our search for an alternative, we examined the feasibility of determining T lymphocyte activation by measuring interleukin-2 receptor (CD25) expression with flow cytometry. We found a good correlation between CD25 molecule expression and the dose of phytohemagglutinin, however, there was no correlation between disintegrations per minute produced by [3H]thymidine uptake and the percentage of CD25 expressed by cells.
