Abstract
Acquired aplastic anemia (AA) is a recognized immune-mediated disorder and abnormally activated T lymphocyte-mediated bone marrow destruction is considered to be its main pathogenesis. Whether abnormal activation of T lymphocytes would also damage bone marrow-derived MSCs remains to be further studied. The aim of this study was to analyze the extent of T lymphocyte activation and the levels of Th1/Th2 cytokines of AA patients, and to explore the immunomodulatory effects of BM-MSCs on IL-2-stimulated T lymphocyte activation and cytokine production in vitro by means of transwell co-culture assay and flow cytometry measurement. The intermediate (CD25+) activated T cells were dominant in peripheral blood, while the early (CD69+) and late (HLA-DR+) activated T cells were predominant in bone marrow. Severe AA patients have an obviously higher proportion of CD3+CD8+CD69+ T cells than NSAA cases. The levels of IL-2 and IL-6 in AA patients were slightly elevated and INF-γ was mildly decreased in comparison with normal individuals. BM-MSCs derived from AA could not effectively inhibit the IL-2-induced activation of T cells with higher proportions of CD25+CD3+CD4+, CD69+CD3+CD4+ and CD25+CD3+CD8+ T cells after co-culture, and they showed a decreased ability to balance the Th1/Th2 cytokine production. Moreover, they had less robust osteogenic differentiation and more prone to adipogenic differentiation. We concluded that abnormally excessive T cell activation accompanied by abnormal cytokine secretion may impair the function of BM-MSCs in children with aplastic anemia.
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Data availability
The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.
Change history
06 December 2023
A Correction to this paper has been published: https://doi.org/10.1007/s10238-023-01252-5
Abbreviations
- BM-MSCs:
-
Bone marrow-derived mesenchymal stem cells
- AA:
-
Aplastic anemia
- SAA:
-
Severe aplastic anemia
- NSAA:
-
Non-severe aplastic anemia
- PBMC:
-
Peripheral blood mononuclear cells
- MACS:
-
Magnetic-activated cell sorting
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Acknowledgements
We would like to thank Ping Chen and Ning Zhao in Hematology-Oncology Laboratory at Children’s Hospital of Zhejiang University School of Medicine for their excellent FCM technical support.
Funding
This work was supported by the grant from Natural Science Foundation of Zhejiang Province (No: LY20H080007).
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XP G conceived, designed and carried out the study, and drafted the manuscript. WW W and YW W carried out part of the study, JP performed the statistical analysis. SS L performed the FCM data analysis. HS, JY Z and WQ X provided the technical assistance in disease diagnosis and clinical data analysis. YC collected and aggregated part of the clinical data. XJ X and YM T participated in the design of the study and helped to draft and edit the manuscript. All authors read and approved the final version of the manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki. The informed consents were obtained from the parents or guardians, and the ethics approval was required according to the guidelines on the Use of Human Subjects in Research. All the procedures described in this report have been approved by the Ethics Committee of Children’s Hospital of Zhejiang University School (Approval number: 2021-IRBAL-045; Approval date: 2021-02-09).
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10238_2023_1238_MOESM1_ESM.jpg
Fig. 5 (Supplementary) Morphology of P3 BM-MSCs and their osteogenic and adipogenic differentiation in bright field. Left image is the fibroblast-like morphology of BM-MSCs from patients with AA and control individuals at P3. Osteogenic and adipogenic differentiation of BM-MSCs in bright field. Right image is relative expression of osteogenic and adipogenic differentiation related genes (ALPL and PPAR-γ) by qRT-PCR to confirm the RNA-Seq results (DATA unpublished, not shown) (JPG 1183 KB)
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Guo, X., Weng, W., Wang, Y. et al. Reduced regulatory effects of bone marrow-derived mesenchymal stem cells on activated T lymphocytes and Th1/Th2 cytokine secretion in children with aplastic anemia. Clin Exp Med 23, 4633–4646 (2023). https://doi.org/10.1007/s10238-023-01238-3
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DOI: https://doi.org/10.1007/s10238-023-01238-3