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CD4+CD25+ regulatory T lymphocytes in tuberculous pleural effusion
Xue-jun Qin1, Huan-zhong Shi, Qiu-li Liang
1Institute of Respiratory Diseases, First Affiliated Hospital, Guangxi Medical University, Nanning, Guangxi 530021, China.
Chinese Medical Journal
|May 10, 2008
Summary
Regulatory T cells (CD4+CD25+) are elevated in tuberculous pleural effusion and suppress immune responses. These findings highlight the role of these cells in tuberculosis pathogenesis.
Area of Science:
- Immunology
- Tuberculosis Research
Background:
- CD4+CD25+ regulatory T lymphocytes actively suppress T cell responses to foreign and self-antigens.
- Investigated the presence and function of CD4+CD25+ regulatory T cells in tuberculous pleural effusion.
Purpose of the Study:
- To determine if CD4+CD25+ regulatory T cells are present and functional in tuberculous pleural effusion.
- To analyze the role of these regulatory T cells in the context of tuberculosis.
Main Methods:
- Flow cytometry was used to quantify CD4+CD25+ T cells in pleural effusion and peripheral blood.
- Forkhead transcription factor Foxp3 expression was assessed.
- In vitro co-culture assays examined the suppressive capacity of CD4+CD25+ T cells on CD4+CD25(-) T cells.
Main Results:
- Tuberculous pleural effusion showed increased numbers of CD4+CD25+ T cells compared to peripheral blood.
- These cells exhibited high-level expression of the Foxp3 transcription factor.
- Isolated CD4+CD25+ T cells demonstrated potent inhibition of CD4+CD25(-) T cell proliferation.
Conclusions:
- Elevated CD4+CD25+ T cells in tuberculous pleural effusion express high levels of Foxp3.
- These cells effectively suppress the proliferation of CD4+CD25(-) T cells, indicating a significant role in the local immune response.
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