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Expression of IL-2 receptor subunit p55 (CD25) on normal human lymphocytes
1Department of Pathology, Armed Forces Hospital, Riyadh, Saudi Arabia.
Insights
Normal Saudi Arabian males show significant expression of the IL-2 receptor subunit p55 (IL-2Rp55) on lymphocytes. Baseline values are crucial for interpreting immune responses or disorders in this population.
Area of Science:
- Immunology
- Cell Biology
- Flow Cytometry
Background:
- The interleukin-2 receptor subunit p55 (IL-2Rp55), also known as CD25, plays a critical role in T-cell activation.
- Understanding baseline expression levels of IL-2Rp55 on lymphocytes is essential for immunological research and clinical diagnostics.
Purpose of the Study:
- To quantify the expression of IL-2 receptor subunit p55 (IL-2Rp55) on unstimulated peripheral blood lymphocytes in normal Saudi Arabian males.
- To compare these findings with data from a Caucasian male population.
Main Methods:
- Two-color flow cytometric analysis was employed using monoclonal antibodies.
- Peripheral blood lymphocytes from normal Saudi Arabian males were analyzed for IL-2Rp55 expression.
Main Results:
- Eighteen percent of lymphocytes in Saudi Arabian males expressed IL-2Rp55.
- IL-2Rp55+ cells were predominantly CD3+ T cells (84%), with CD4+ and CD8+ subsets comprising 75% and 13%, respectively.
- Saudi Arabian males had lower overall IL-2Rp55+ lymphocyte proportions compared to Caucasians (18% vs. 33% +/- 10%), with significant differences noted in CD4+ T cells but not CD8+ T cells.
Conclusions:
- Significant expression of IL-2Rp55 (CD25) is present on peripheral blood lymphocytes in healthy Saudi Arabian males and Caucasians.
- Establishing local baseline values for IL-2Rp55+ lymphocytes is recommended before clinical interpretation.
- These baseline values are critical for differentiating normal immune function from immune disorders or active immune responses.
Abstract:
Unstimulated peripheral blood lymphocytes of normal Saudi Arabian males were examined for the expression of IL-2 receptor subunit p55 (IL-2Rp55) by two-color flow cytometric analysis using monoclonal antibodies. Eighteen percent of the normal lymphocytes were positive for this marker. Approximately 84% of the IL-2Rp55+ cells were CD3+ T cells of which CD4+ and CD8+ T cell subsets constituted 75 and 13%, respectively. CD19+ B cells made up 12% of the IL-2Rp55+ lymphocytes. In the pan T cell population 20% cells were IL-2Rp55+, whereas among the B cells 16% cells were IL-2Rp55+. In the CD4+ and CD8+ T cell population IL-2Rp55+ cells were 29 and 7% respectively. In comparison, normal Caucasian male population had significantly higher proportions of IL-2Rp55+ lymphocyte subsets, the total IL-2Rp55+ lymphocytes being 33 +/- 10%. However, except for CD8+ T cells, there was no difference in the mean phenotypic values of IL-2Rp55+ cells between the two populations. The present findings clearly show a significant expression of IL-2Rp55 (CD25) on peripheral blood lymphocytes in normal, healthy Saudi Arabian blood donors and Caucasians. It is suggested that the baseline values of IL-2Rp55+ lymphocytes must be established for the local normal population before the expression of this marker is implicated either as an active immune response or as an immune disorder.
