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Area of Science:

  • Immunology
  • Cell Biology
  • Biomedical Engineering

Background:

  • Mesenchymal stromal cells (MSCs) are known for their immunosuppressive properties and role in tissue repair.
  • MSCs secrete extracellular vesicles (MVs-MSCs) that carry similar regulatory functions.
  • MVs-MSCs are known to modulate T cells, but their effect on macrophages remains unclear.

Purpose of the Study:

  • To investigate the immunoregulatory effects of MVs-MSCs on activated M1 macrophages.
  • To explore the in vitro and in vivo impact of MVs-MSCs on macrophage polarization and function.

Main Methods:

  • In vitro studies using differentiated bone marrow macrophages treated with MVs-MSCs.
  • In vivo studies using a thioglycollate-induced peritonitis model in mice.
  • Analysis of macrophage surface markers, inflammatory cytokine levels, miRNA expression, and gene targets.

Main Results:

  • MVs-MSCs induced a regulatory phenotype in M1 macrophages in vitro, characterized by increased CD206, IL-10, and Arginase, and decreased inflammatory markers (IL-1β, IL-6, nitric oxide).
  • MVs-MSCs downregulated inflammatory miRNAs (miR-155, miR-21) and upregulated SOCS3 in M1 macrophages.
  • In vivo, MVs-MSCs reduced macrophage infiltration and promoted an M2-like phenotype, with altered expression of inflammatory and regulatory markers, partially via CX3CR1 upregulation.

Conclusions:

  • MVs-MSCs effectively modulate activated M1 macrophages towards a regulatory phenotype both in vitro and in vivo.
  • MVs-MSCs represent a promising cell-free therapeutic strategy for modulating macrophage-driven inflammatory responses.
  • The findings elucidate a novel mechanism by which MVs-MSCs exert immunomodulatory effects through macrophage reprogramming.