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Updated: Jul 15, 2025
Assessment of the Immunomodulatory Properties of Human Mesenchymal Stem Cells MSCs
Published on: December 24, 2015
Impaired immunosuppressive effect of bone marrow mesenchymal stem cell-derived exosomes on T cells in aplastic anemia
Shichong Wang1,2, Jiali Huo1, Yilin Liu1
1Diagnostic and Therapeutic Center for Anemic Diseases, State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Haihe Laboratory of Cell Ecosystem, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300020, China.
Background:
Previous studies have verified the dysfunction of mesenchymal stem cells (MSCs) for immunoregulation in acquired aplastic anemia (AA) patients. Exosomes derived from MSCs can partially substitute MSCs acting as immune regulator. Dysfunction of exosomes (Exos) derived from AA-MSC (AA-Exos) may play a key role in immunologic dissonance.
Method:
In this study, CD3 + T cells were collected and cocultured with AA-Exos and exosomes derived from HD-MSC (HD-Exos). The proliferation, differentiation and activation of CD3 + T cells were detected to compare the immunosuppressive effects between AA-Exos and HD-Exos. An immune-mediated murine model of AA was structured to compare the therapeutic effect of AA-Exos and HD-Exos. Furthermore, total RNA including miRNA from exosomes we purified and total RNA of CD3 + T cells were extracted for RNA-seq in order to construct the miRNA-mRNA network for interactions and functional analysis.
Results:
AA-Exos had impaired inhibition effects on CD3 + T cells in terms of cell proliferation, activation and differentiation compared with exosomes from HD-Exos. HD-Exos showed a more effective rescue of AA mice compared to AA-Exos. Importantly, we found some differentially expressed miRNA involved in immune response, such as miR-199, miR-128 and miR-486. The Gene Ontology analysis of differentially expressed genes (DEGs) revealed involvement of various cellular processes, such as lymphocyte chemotaxis, lymphocyte migration and response to interferon-gamma. The Kyoto Encyclopedia of Genes and Genomes analysis illustrated upregulation of critical pathways associated with T cell function after coculturing with AA-Exos compared with HD-Exos, such as graft-versus-host disease, Th17 cell differentiation and JAK-STAT signaling pathway. A miRNA-mRNA network was established to visualize the interaction between them.
Conclusion:
In summary, AA-Exos had impaired immunosuppressive effect on T cells, less ability to rescue AA mice and differently expressed miRNA profile, which might partly account for the pathogenesis of AA as well as provide a new target of AA treatment.
Insights
Exosomes from aplastic anemia patients' mesenchymal stem cells (AA-Exos) show impaired immune suppression and therapeutic effects compared to healthy donor exosomes (HD-Exos). These AA-Exos exhibit altered miRNA profiles, suggesting a role in aplastic anemia pathogenesis and potential therapeutic targets.
Area of Science:
- Immunology and Stem Cell Biology
- Molecular Medicine
- Hematology
Background:
- Mesenchymal stem cells (MSCs) dysfunction in immunoregulation is known in aplastic anemia (AA) patients.
- Exosomes from MSCs can mediate immune regulation, but their dysfunction in AA may contribute to immune dysregulation.
- AA-derived MSC exosomes (AA-Exos) may play a critical role in the immunologic dissonance observed in aplastic anemia.
Purpose of the Study:
- To compare the immunosuppressive effects of exosomes derived from AA-MSCs (AA-Exos) and healthy donor MSCs (HD-Exos) on T cells.
- To evaluate the therapeutic efficacy of AA-Exos versus HD-Exos in an immune-mediated murine model of AA.
- To investigate the molecular mechanisms, including miRNA-mRNA interactions, underlying the functional differences between AA-Exos and HD-Exos.
Main Methods:
- Co-culture of CD3+ T cells with AA-Exos and HD-Exos to assess T cell proliferation, differentiation, and activation.
- Establishment of an immune-mediated murine model of AA to compare the therapeutic effects of AA-Exos and HD-Exos.
- RNA sequencing (RNA-seq) of exosomes and T cells to construct a miRNA-mRNA interaction network and perform functional analysis.
Main Results:
- AA-Exos demonstrated impaired inhibition of CD3+ T cell proliferation, activation, and differentiation compared to HD-Exos.
- HD-Exos showed superior therapeutic rescue in AA mice compared to AA-Exos.
- Differentially expressed miRNAs (e.g., miR-199, miR-128, miR-486) and altered pathways (e.g., graft-versus-host disease, Th17 cell differentiation, JAK-STAT signaling) were identified, with a constructed miRNA-mRNA network.
Conclusions:
- AA-Exos exhibit diminished immunosuppressive capacity on T cells and reduced therapeutic potential in AA models.
- Altered miRNA profiles in AA-Exos may contribute to AA pathogenesis.
- Dysfunctional AA-Exos represent a potential therapeutic target for aplastic anemia treatment.
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