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Updated: Jun 2, 2026
Discrimination of Seven Immune Cell Subsets by Two-fluorochrome Flow Cytometry
Published on: March 5, 2019
[Phenotypic analysis of BCG-specific effector memory CD4+ T cells in PBMCs by eight-color flow cytometry]
Li Li1, Xiao-ying Fu, Chang-you Wu
1Institute of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Key Laboratory of Tropical Disease Control Research of Ministry of Education, Guangzhou 510080, China. ly_li@yahoo.cn
Insights
Bacille Calmette-Guérin (BCG) vaccination primarily activates CD4+ T cells to produce cytokines like IFN-γ, IL-2, and TNF-α. These effector memory cells are crucial for preventing tuberculosis (TB) infection.
Area of Science:
- Immunology
- Infectious Disease Research
Context:
- Tuberculosis (TB) remains a significant global health challenge.
- Understanding the host immune response to BCG vaccination is vital for developing effective TB control strategies.
Purpose:
- To investigate cytokine production and T cell subsets in peripheral blood mononuclear cells (PBMCs) from purified protein derivative-positive (PPD+) donors following stimulation with BCG.
- To characterize the phenotype of BCG-induced cytokine-producing T cells.
Summary:
- Peripheral blood mononuclear cells (PBMCs) from PPD+ individuals were stimulated with BCG and analyzed using eight-color flow cytometry.
- BCG stimulation predominantly induced CD4+ T cells, not CD8+ T cells, to express IFN-γ, IL-2, and TNF-α.
- The cytokine-producing CD4+ T cells were identified as CD45RO+CD62L-CD27- and CD45RO+CD62L-CD27+ effector memory cells.
Impact:
- The findings highlight the critical role of CD4+ effector memory T cells in the immune response to BCG.
- This suggests a key mechanism by which BCG vaccination may contribute to protection against TB infection.
- Further research into these specific T cell subsets could inform the development of improved TB vaccines.
Aim:
To evaluate cytokine production and subsets in PBMCs from PPD+ normal donors after stimulation with BCG.
Methods:
PBMCs were isolated from PPD+ normal individuals, and cytokine production and BCG-specific T cell subsets were assessed by eight-color flow cytometry.
Results:
Following stimulation with BCG, CD4+ but not CD8+ T cells expressed IFN-γ, IL-2 and TNF-α. Phenotypic analysis indicated that cytokine-producing cells were CD4+CD45RO+CD62L-CD27- and CD4+CD45RO+CD62L-CD27+.
Conclusion:
BCG predominantly induced CD4+ T cells to produce cytokines following stimulation with BCG. Further analysis indicated that these cells are CD4+CD45RO+CD62L- effector memory cells, suggesting that these cells probably played essential role in preventing TB infection.
