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Updated: May 31, 2026
Purification, Expansion, and Flow Cytometry-Based Phenotyping of Mouse Derived Bone Marrow Mesenchymal Stem Cells
Published on: July 11, 2025
Isolation of mouse mesenchymal stem cells with normal ploidy from bone marrows by reducing oxidative stress in
Guokuan Fan1, Lai Wen, Minshu Li
1School of Life Science, Sun Yat-Sen University, Guangzhou, China.
Background:
Isolation of mouse MSCs (mMSCs) with normal ploidy from bone marrow remains challenging. mMSCs isolated under 20% O(2) are frequently contaminated by overgrown hematopoietic cells, and could also be especially vulnerable to oxidative damage, resulting in chromosomal instability. Culture under low oxygen or extracellular matrix (ECM) improves proliferation of MSCs in several species. We tested the hypothesis that culture under low oxygen in combination with ECM prepared from mouse embryonic fibroblast (MEF-ECM) could be used to purify proliferative mMSCs, and to reduce oxidative damage and maintain their chromosomal stability.
Results:
Optimization of culture conditions under 20% O(2) resulted in immortalization of mMSCs, showing extensive chromosome abnormalities, consistent with previous studies. In contrast, culture under low oxygen (2% O(2)) improved proliferation of mMSCs and reduced oxidative damage, such that mMSCs were purified simply by plating at low density under 2% O(2). MEF-ECM reduced oxidative damage and enhanced proliferation of mMSCs. However, these isolated mMSCs still exhibited high frequency of chromosome abnormalities, suggesting that low oxygen or in combination with MEF-ECM was insufficient to fully protect mMSCs from oxidative damage. Notably, antioxidants (alpha -phenyl-t-butyl nitrone (PBN) and N-acetylcysteine (NAC)) further reduced DNA damage and chromosomal abnormalities, and increased proliferation of mMSCs. mMSCs isolated by the combination method were successfully used to generate induced pluripotent stem (iPS) cells by ectopic expression of Oct4, Sox2, Klf4 and c-Myc.
Conclusions:
We have developed a technique that allows to reduce the number of karyotypic abnormalities for isolation of primary mMSCs and for limited culture period by combination of low oxygen, MEF-ECM, antioxidants and low density plating strategy. The effectiveness of the new combination method is demonstrated by successful generation of iPS cells from the isolated mMSCs. However, a culture system for mMSCs still is needed to prevent all the anomalies, especially after a long-term culture period.
Insights
Researchers developed a new method to isolate mouse mesenchymal stem cells (mMSCs) with improved chromosomal stability. This technique utilizes low oxygen, extracellular matrix, and antioxidants to enhance mMSC proliferation and reduce damage, enabling successful generation of induced pluripotent stem cells.
Area of Science:
- Stem Cell Biology
- Cell Culture Optimization
- Genetics and Genomics
Background:
- Isolating mouse mesenchymal stem cells (mMSCs) with normal ploidy from bone marrow is difficult.
- Standard culture conditions (20% O2) lead to hematopoietic cell contamination, oxidative damage, and chromosomal instability in mMSCs.
- Low oxygen or extracellular matrix (ECM) culture can improve MSC proliferation in other species.
Purpose of the Study:
- To test if low oxygen combined with mouse embryonic fibroblast-derived ECM (MEF-ECM) can purify proliferative mMSCs.
- To reduce oxidative damage and maintain chromosomal stability during mMSC isolation and culture.
- To establish a more robust method for obtaining high-quality mMSCs for downstream applications.
Main Methods:
- Culturing mMSCs under low oxygen (2% O2) and on MEF-ECM.
- Utilizing low-density plating for purification.
- Supplementing cultures with antioxidants like alpha-phenyl-t-butyl nitrone (PBN) and N-acetylcysteine (NAC).
- Assessing mMSC proliferation, oxidative damage, and chromosomal stability.
- Generating induced pluripotent stem (iPS) cells from isolated mMSCs.
Main Results:
- Low oxygen culture (2% O2) improved mMSC proliferation and reduced oxidative damage, enabling purification via low-density plating.
- MEF-ECM further reduced oxidative damage and enhanced proliferation.
- Combined low oxygen and MEF-ECM were insufficient to fully prevent chromosomal abnormalities.
- Antioxidants (PBN, NAC) significantly reduced DNA damage and chromosomal abnormalities, boosting proliferation.
- mMSCs isolated using the combined method were successfully reprogrammed into iPS cells.
Conclusions:
- A novel technique combining low oxygen, MEF-ECM, antioxidants, and low-density plating reduces karyotypic abnormalities in primary mMSCs for limited culture periods.
- The method's efficacy is validated by successful iPS cell generation.
- Further improvements are needed for a culture system that prevents all anomalies, especially during long-term mMSC culture.
