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Th2 predominance at the single-cell level in patients with IgA nephropathy
I Ebihara1, K Hirayama, S Yamamoto
1Department of Internal Medicine, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8575, Japan.
Insights
IgA nephropathy (IgA-N) patients show a shift toward a Th2 immune response. This immune imbalance, characterized by altered helper T (Th) cell cytokine production, may contribute to IgA-N pathogenesis.
Area of Science:
- Immunology
- Nephrology
- Cellular Biology
Background:
- Lymphocyte function abnormalities are implicated in IgA nephropathy (IgA-N) pathogenesis.
- Investigating helper T (Th) cell predominance at a single-cell level is crucial for understanding IgA-N.
- This study focuses on specific cytokine profiles in Th cells.
Purpose of the Study:
- To investigate helper T (Th) cell predominance in IgA nephropathy (IgA-N) patients.
- To analyze single-cell cytokine expression in Th cells from IgA-N patients and healthy controls.
- To determine if Th cell polarization is associated with IgA-N.
Main Methods:
- Flow cytometry was used to assess circulating Th cells in 30 IgA-N patients and 30 healthy individuals.
- Intracellular cytokine levels for Th1 (IL-2, IFN-gamma) and Th2 (IL-4, IL-10, IL-13) were measured.
- Cytokine synthesis was examined at multiple time points (3, 6, 9, 12 hours) post-stimulation.
Main Results:
- IgA-N patients had significantly lower IL-2 positive Th cells at 6, 9, and 12 hours compared to controls.
- IFN-gamma positive Th cells were reduced in IgA-N patients at 9 hours.
- Increased IL-4 and IL-13 expression was observed in IgA-N patients at 6 hours, with significantly higher IL-10 positive Th cells at all time-points.
Conclusions:
- A polarization towards a Th2 response in stimulated lymphocytes may underlie immune abnormalities in IgA-N.
- Altered cytokine profiles in Th cells suggest a role in IgA nephropathy development.
- These findings highlight potential immune dysregulation in IgA-N.
Background:
Abnormalities of lymphocyte function have been reported to be involved in the pathogenesis of IgA nephropathy (IgA-N). The aim of this study was to investigate helper T (Th) predominance at the single-cell level, one of the abnormalities of lymphocyte function in IgA-N.
Methods:
Using flowcytometry, we assessed the levels of circulating Th cells in IgA-N patients (n=30), and in normal individuals (n=30) based on the expression of intracellular Th1 cytokines for interleukin-2 (IL-2) and interferon-gamma (IFN-gamma), and of intracellular Th2 cytokines for IL-4, IL-10, and IL-13. Because the production of each cytokine had a specific time course, we examined cytokine synthesis at 3, 6, 9, and 12 h after stimulation.
Results:
The percentages of IL-2-positive Th cells from IgA-N patients were significantly lower than in normal individuals at 6, 9, and 12 h, with the difference becoming greater with time. The number of IFN-gamma-positive Th cells in IgA-N patients was significantly lower than in normal individuals at 9 h, and the number of IFN-gamma-positive Th cells increased more at 12 h than at 3 h in both groups. IL-4 and IL-13 expression was increased in patients with IgA-N at 6 h compared with normal individuals. In IgA-N patients, the percentage of IL-10-positive Th cells was significantly higher than that in normal individuals at each time-point.
Conclusion:
A polarization toward Th2 response at the stimulated lymphocyte level may lead to immune abnormalities in IgA-N.
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