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Updated: May 23, 2025

Isolation, Characterization, and Therapeutic Application of Extracellular Vesicles from Cultured Human Mesenchymal Stem Cells
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Isolation, Characterization, and Therapeutic Application of Extracellular Vesicles from Cultured Human Mesenchymal Stem Cells

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Microvesicles and exosomes isolated from murine bone marrow-derived mesenchymal stromal cells primed with p38MAPK

Pallavi Budgude1,2, Vaijayanti Kale2, Anuradha Vaidya1,2

  • 1Symbiosis School of Biological Sciences, Symbiosis International (Deemed University), Pune, India.

Artificial Cells, Nanomedicine, and Biotechnology
|March 10, 2025
PubMed

Insights

Priming mesenchymal stromal cells (MSCs) with a p38 inhibitor generates distinct microvesicles (MVs) and exosomes (Exos) that differentially regulate hematopoietic stem cell (HSC) expansion and function, improving transplantation outcomes.

Area of Science:

  • Cell Biology
  • Stem Cell Biology
  • Biotechnology

Background:

  • Mesenchymal stromal cells (MSCs) secrete microvesicles (MVs) and exosomes (Exos) that influence cell function.
  • Priming MSCs with a p38 inhibitor (pMSCs) rejuvenates them and enhances their ability to support hematopoietic stem cell (HSC) expansion.
  • The specific roles of pMSC-derived MVs (pMVs) and Exos (pExos) in HSC regulation remain to be elucidated.

Purpose of the Study:

  • To investigate the distinct roles of pMVs and pExos in regulating HSC fate and function.
  • To determine the molecular mechanisms by which pMVs and pExos influence HSC quiescence and proliferation.
  • To evaluate the potential of a composite graft strategy using pMVs and pExos for improving HSC transplantation success.

Main Methods:

  • Isolation and characterization of MVs and Exos from pMSCs.
  • Functional assays to assess the impact of pMVs and pExos on long-term HSCs (LT-HSCs) and short-term HSCs (ST-HSCs).
  • Gene expression analysis, functional, and phenotypic experiments to identify molecular pathways involved in HSC regulation.

Main Results:

  • pMVs promoted LT-HSC expansion with self-renewal and engraftment capacity.
  • pExos facilitated ST-HSC expansion with proliferative and differentiation potential.
  • A combination of pMVs and pExos in a composite graft significantly enhanced HSC engraftment.
  • pMVs regulate HSC quiescence via the Egr1/Cdkn1a axis, while pExos control proliferation via the Nfya/Cdkn1a axis.

Conclusions:

  • pMVs and pExos derived from pMSCs differentially regulate HSC populations.
  • pMVs support LT-HSCs, while pExos support ST-HSCs.
  • A composite graft strategy using pMVs and pExos shows promise for improving HSC transplantation by synergistically enhancing HSC engraftment.
Keywords:
Hematopoietic stem cellsexosomesmesenchymal stromal cellsmicrovesiclesp38 MAPK

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