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Are bone marrow stem cells plastic or heterogenous--that is the question
Magda Kucia1, Janina Ratajczak, Mariusz Z Ratajczak
1Stem Cell Biology Program at James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202, USA.
Experimental Hematology
|May 25, 2005
Summary
Bone marrow contains diverse stem cell types beyond hematopoietic stem cells (HSC). Considering these heterogeneous stem cells (HSC, TCSC, PSC) is crucial for accurate interpretations of cell plasticity research.
Area of Science:
- Stem cell biology
- Hematology
- Regenerative medicine
Background:
- Recent studies on hematopoietic stem cell (HSC) plasticity often overlook bone marrow (BM) heterogeneity.
- Inadequate controls in plasticity experiments can lead to misinterpretations of HSC behavior.
Purpose of the Study:
- To discuss the alternative explanation of BM stem cell heterogeneity for observed plasticity.
- To highlight the presence of tissue-committed stem cells (TCSC) and pluripotent stem cells (PSC) in BM.
Main Methods:
- Review of existing literature on stem cell plasticity and heterogeneity.
- Analysis of data supporting the presence of diverse stem cell populations in BM.
- Discussion of experimental controls needed for accurate interpretation.
Main Results:
- Bone marrow harbors not only HSC but also TCSC and PSC populations.
- These diverse stem cells can mobilize from BM to peripheral blood after injury.
- Accumulation of these cells in BM occurs during ontogenesis.
Conclusions:
- Observed HSC plasticity may be attributed to the presence of TCSC/PSC in BM.
- BM-derived stem cell heterogeneity offers an alternative explanation for plasticity phenomena.
- Future research must account for BM stem cell diversity for accurate interpretation.