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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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Assessment of the Immunomodulatory Properties of Human Mesenchymal Stem Cells MSCs
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[Human lymphocyte immunophenotype after interaction with mesenchymal stromal cells].

E R Andreeva, I V Andrianova, P I Bobyleva

    Fiziologiia Cheloveka
    |December 17, 2014
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    Human multipotent mesenchymal stromal cells (MMSCs) influence immune cell populations when cocultured. MMSCs decrease B-cells and impact T-cell and NK cell proportions, while supporting overall cell viability.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Regenerative Medicine

    Background:

    • Mesenchymal stromal cells (MSCs) are immunomodulatory and have therapeutic potential.
    • Understanding cell-to-cell interactions is crucial for clinical applications of allogeneic cell products.
    • The impact of MSCs on different immune cell subsets requires detailed investigation.

    Purpose of the Study:

    • To investigate the effects of human multipotent mesenchymal stromal cells (MMSCs) on allogeneic blood-borne mononuclear cells (MNCs).
    • To analyze changes in immune cell populations (B-cells, T-cells, NK cells) after coculture with MMSCs.
    • To assess the influence of MNC maturity and activation state on MMSC interactions.

    Main Methods:

    • Coculture of MMSCs with allogeneic adult peripheral blood MNCs and umbilical cord blood MNCs (cbMNCs) for 72 hours.
    • Analysis of immune cell subset proportions (B-cells, T-cells, NK cells, CD8+ T-cells) using flow cytometry.
    • Evaluation of cell viability and expression of activation markers (HLA-DR, CD25) in monocultures and cocultures.

    Main Results:

    • Coculture with MMSCs decreased the proportion of B-cells among MNCs and cbMNCs.
    • T-cell and NK cell proportions declined specifically in cbMNCs, with a reduction in the T-NK subpopulation in both MNC types.
    • CD8+ T-cell counts dropped in cocultures with PHA-activated MNCs, while activated HLA-DR+ cells decreased and CD25+ cells increased.

    Conclusions:

    • MMSCs modulate the composition of allogeneic immune cell populations, affecting B-cell, T-cell, and NK cell subsets.
    • MMSCs demonstrate a supportive role in maintaining the viability of various blood-borne immune cells.
    • These findings provide insights into allogeneic cell interactions, relevant for the clinical use of combined stromal and blood-borne cell therapies.