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Related Experiment Video

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Assessment of the Immunomodulatory Properties of Human Mesenchymal Stem Cells MSCs
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Interferon γ induced compositional changes in human bone marrow derived mesenchymal stem/stromal cells.

Qingdong Guan1,2, Peyman Ezzati3, Victor Spicer3

  • 1Manitoba Centre for Advanced Cell and Tissue Therapy, Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, MB Canada.

Clinical Proteomics
|July 12, 2017
PubMed
Summary

Interferon-gamma (IFN-γ) treatment alters the protein composition of human mesenchymal stem cells (MSCs). This study identified over 200 changed proteins, revealing novel insights into MSC immunomodulation and potential new therapeutic targets.

Keywords:
2D LC mass spectrometryHumanInterferon γLicensingMembraneMesenchymal stem/stromal cells (MSC)ProteomicsQuantitative proteome profiling

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Area of Science:

  • Immunology
  • Proteomics
  • Stem Cell Biology

Background:

  • Mesenchymal stem/stromal cells (MSCs) possess immunoregulatory functions.
  • Interferon-gamma (IFN-γ) enhances MSC immunomodulatory properties, a process termed 'licensing'.
  • The specific proteomic changes during MSC licensing remain incompletely understood.

Purpose of the Study:

  • To conduct a detailed comparative proteomic analysis of human bone marrow-derived MSCs.
  • To identify compositional changes in MSCs after 20-hour IFN-γ treatment.
  • To elucidate the molecular mechanisms underlying IFN-γ-mediated MSC licensing.

Main Methods:

  • Utilized 2D LC MS/MS analysis for proteomic profiling.
  • Analyzed samples from five healthy donors.
  • Confirmed protein expression changes using flow cytometry and bioinformatic analysis (STRING, Interferome DB).

Main Results:

  • Identified over 8400 proteins, with 210 showing significant expression level alterations (≥|2SD|) after IFN-γ treatment.
  • Approximately 30% of altered proteins are involved in known interferon-mediated pathways.
  • ~35% of identified proteins have not been previously reported as IFN-γ responsive.

Conclusions:

  • Provides an in-depth proteomic profile of basal and IFN-γ-treated human MSCs.
  • Identifies novel proteins potentially contributing to the enhanced immunoregulatory capacity of licensed MSCs.
  • Highlights potential new targets for modulating MSC immunomodulatory functions.