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Isolate Circulating Mesenchymal Stromal Cells Without Growth Factor Administration and Using Density Gradient.

Jason Ma1, Chung-Chuan Hsiung2, Tzu-Hsien Yang1

  • 1Department of Microbiology and Immunology, Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan (ROC).

Stem Cells International
|June 27, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for isolating mesenchymal stromal cells (MSCs) from peripheral blood (PB) without growth factors. The new protocol offers a convenient and efficient approach for obtaining these valuable therapeutic cells.

Keywords:
differentiationimmunomodulatory abilitiesmesenchymal stromal cellsperipheral blood

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Area of Science:

  • Stem Cell Biology
  • Immunology
  • Regenerative Medicine

Background:

  • Mesenchymal stromal cells (MSCs) possess potent differentiation and immunomodulatory properties, making them promising for therapeutic applications.
  • Peripheral blood (PB) is explored as an alternative source for MSC isolation, complementing traditional bone marrow sources.

Purpose of the Study:

  • To develop and validate an alternative protocol for isolating mesenchymal stromal cells from peripheral blood (PB).
  • To eliminate the need for pre-administered growth factors and density gradient methods in MSC isolation.
  • To assess the characteristics, differentiation potential, and immunomodulatory functions of the isolated PB-MSCs.

Main Methods:

  • Peripheral blood (PB) was collected and coincubated with glycerin.
  • A distinct cell layer above red blood cells (RBCs) was isolated post-incubation.
  • Isolated cells were cultured, and adherent spindle-shaped cells were identified and characterized for MSC surface markers and differentiation capacity.
  • Immunomodulatory functions were assessed by evaluating T cell activation suppression.

Main Results:

  • The isolation method yielded an increased population of CD34-negative, CD45-negative cells compared to Ficoll gradient isolation of PB mononuclear cells (PBMCs).
  • Cultured cells exhibited MSC surface markers and differentiated into adipocytes, osteocytes, and chondrocytes.
  • Isolated PB-MSCs demonstrated a population doubling time (PDT) of 30-40 hours in early passages.
  • The PB-MSCs effectively suppressed T cell activation, confirming their immunomodulatory capabilities.

Conclusions:

  • This protocol provides a convenient and efficient alternative for isolating mesenchymal stromal cells from peripheral blood.
  • The developed method bypasses the need for growth factors and complex density gradient techniques.
  • Peripheral blood-derived MSCs isolated using this method retain their differentiation potential and immunomodulatory functions, supporting their use in regenerative medicine.