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Updated: Jun 12, 2026
Purification, Expansion, and Flow Cytometry-Based Phenotyping of Mouse Derived Bone Marrow Mesenchymal Stem Cells
Published on: July 11, 2025
Isolation of therapeutically functional mouse bone marrow mesenchymal stem cells within 3 h by an effective
F S-H Hsiao1, C-C Cheng, S-Y Peng
1Department of Animal Science and Technology, National Taiwan University, Taipei, Taiwan.
Objectives:
Isolation of mouse mesenchymal stem cells (mMSCs), by the approach of plastic adherence, has been difficult due to persistent contamination by haematopoietic cells (HCs); we have observed that this contamination was due to engagement between HCs and mMSCs. The HCs can be lifted together with the mMSCs despite their insensitivity to trypsin digestion. Herein, we provide a single-step procedure to rapidly segregate mMSCs from HC contaminants using transient lower-density plastic adherence (tLDA).
Materials And Methods:
The tLDA was performed by replating bone marrow adherent cells at lower density (1.25 x 10(4) cells/cm(2)) than usual, allowing for transient adherence of no more than 3 h, followed by trypsin digestion. tLDA-isolated cells were evaluated by immunophenotyping, multi-differentiation potentials, immunosuppressive properties, and therapeutic potential as demonstrated by symptoms of osteoporosis.
Results:
The single-step tLDA method can effectively eliminate the persistent HC contaminants; tLDA-isolated cells were phenotypically equivalent to those reported as mMSCs. The isolated cells possessed classic tri-lineage differentiation potential into osteogenic, adipogenic and chondrogenic lineages and had immunosuppressive properties. After intravenous transplantation, they migrated into the allogeneic bone marrow and rescued hosts from osteoporosis symptoms, demonstrating their therapeutic potential.
Conclusions:
We have developed a simple and economical method that effectively isolates HC-free, therapeutically functional mMSCs from bone marrow cell adherent cultures. These cells are suitable for various mechanistic and therapeutic studies in the mouse model.
Insights
A new method, transient lower-density plastic adherence (tLDA), efficiently isolates pure mouse mesenchymal stem cells (mMSCs) from bone marrow. This technique overcomes hematopoietic cell (HC) contamination, yielding therapeutically functional mMSCs for research.
Area of Science:
- Stem Cell Biology
- Cell Isolation Techniques
- Regenerative Medicine
Background:
- Traditional isolation of mouse mesenchymal stem cells (mMSCs) via plastic adherence is hindered by hematopoietic cell (HC) contamination.
- Hematopoietic cells engage with mMSCs, making them difficult to remove with standard trypsin digestion.
Purpose of the Study:
- To develop a rapid, single-step procedure for isolating pure mMSCs from bone marrow.
- To overcome the challenge of persistent HC contamination in mMSC cultures.
Main Methods:
- Transient lower-density plastic adherence (tLDA) involves replating bone marrow cells at low density (1.25 x 10^4 cells/cm^2) for a short adherence period (≤3 hours) before trypsin digestion.
- Isolated cells were characterized by immunophenotyping, multi-differentiation assays, immunosuppressive property evaluation, and in vivo therapeutic potential assessment in an osteoporosis model.
Main Results:
- The tLDA method effectively eliminated HC contaminants, yielding phenotypically pure mMSCs.
- Isolated mMSCs demonstrated tri-lineage differentiation potential (osteogenic, adipogenic, chondrogenic) and potent immunosuppressive properties.
- Transplanted mMSCs migrated to bone marrow and ameliorated osteoporosis symptoms, confirming their therapeutic efficacy.
Conclusions:
- A simple, economical, and effective tLDA method was established for isolating HC-free, functional mMSCs from bone marrow.
- The isolated mMSCs are suitable for diverse mechanistic and therapeutic applications in mouse models.
