Abstract
Background
Recent data have demonstrated that long-lived memory T cells are present in the human lung and can play significant roles in the pathogenesis of specific allergic and autoimmune diseases. However, most evidence has been obtained from mouse studies, and the potential roles of memory T cells in human allergic diseases, such as asthma, remain largely unknown.
Methods
Thirty-three asthmatics, 26 chronic obstructive pulmonary disease (COPD) patients, and 22 healthy volunteers were enrolled in this study. Peripheral blood mononuclear cells (PBMCs) were isolated from the peripheral blood, and cell surface staining (CD4, CD45RO, CRTH2, CD62L, and CCR7) was performed for the detection of memory CD4+ T cells in blood. After stimulation with interleukin-27 (IL-27) or IL-4 for 15 min, the STAT1/STAT6 phosphorylation of memory CD4+ T cells was measured separately by flow cytometric techniques. The cytokine-releasing profiles after 6 days of culture under neutralization, TH2, TH2 + lipopolysaccharide (LPS), and TH2 + house dust mite (HDM) conditions were detected by intracellular protein (IL-5, IL-17, and interferon (IFN)-γ) staining. Correlation analyses between the profile of memory CD4+ T cells and clinical characteristics of asthma were performed.
Results
The number of circulating memory CD4+ T (CD4+ Tm) cells in asthmatics was increased compared with that in the healthy subjects (48 ± 5.7 % vs. 32 ± 4.1 %, p < 0.05). Compared with COPD and healthy subjects, the phosphorylation of signal transducer and activator of transcription 1 (STAT1-py) was impaired in asthmatics, whereas the phosphorylation of signal transducer and activator of transcription 6 (STAT6-py) was slightly enhanced. This imbalance of STAT1-py/STAT6-py was attributed to TH2 memory cells but not non-TH2 memory cells in blood. The cytokine-releasing profiles of asthmatics was unique, specifically IL-5high, IL-17high, and IFN-rlow, compared with those of COPD patients and healthy subjects. The IL-17 production levels in CD4+ Tm cells are associated with disease severity and positively correlated with medication consumption in asthma.
Conclusions
The long-lived, antigen-specific memory CD4+ T cells, rather than PBMCs or peripheral lymphocytes, might be the ideal T cell subset candidates for analyzing the endotype of asthma. Memory CD4+ T cells exhibiting a shift in STAT phosphorylation and specific cytokine-releasing profiles have the potential to facilitate the understanding of disease heterogeneity and severity, allowing the more personalized treatment of patients.
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Abbreviations
- STATs:
-
Signal transducer and activator of transcription
- CD4+Tm:
-
Memory CD4+ T Cells
- COPD:
-
Chronic obstructive pulmonary disease
- PBMCs:
-
Peripheral blood mononuclear cells
- STAT1-py:
-
STAT1 phosphorylation
- STAT6-py:
-
STAT6 phosphorylation
- LPS:
-
Lipopolysaccharide
- HDM:
-
house dust mite
- ILs:
-
interleukins
- Tem:
-
effector memory T cells
- Tcm:
-
central memory T cells
- Trm:
-
resident memory T cells
- Treg:
-
T regulatory cell
- MFIs:
-
Mean fluorescence intensities
- GINA:
-
Global Initiative for Asthma
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (81270078 and 81470211 to ZHC) and the “Zhengyi” Scholar Program of Fudan University (JYH6273202/002/023/014 to GS and SXC).
Author contributions
ZHC, XDW, LZ, and JP conceived and designed the study. ZHC, DDL, ZHM, XQS, HLY, GS, and SXC performed the biological experiments. YJ was responsible for the statistical analysis. ZHC and JP wrote the paper. All the authors read and approved the final manuscript.
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Zhihong Chen and Jue Pan contributed equally to this work.
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Suppl Fig. 1
No liner correlations between IL-17+CD4+Tm cell number and several clinical characteristics (Eos, IgE and FEV1) (PDF 169 kb)
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Chen, Z., Pan, J., Jia, Y. et al. Effect of memory CD4+ T cells’ signal transducer and activator of transcription (STATs) functional shift on cytokine-releasing properties in asthma. Cell Biol Toxicol 33, 27–39 (2017). https://doi.org/10.1007/s10565-016-9357-6
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DOI: https://doi.org/10.1007/s10565-016-9357-6