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Asymmetric cell divisions in hematopoietic stem cells
T H Brümmendorf1, W Dragowska, P M Lansdorp
1Terry Fox Laboratory, British Columbia Cancer Research Centre, Vancouver, Canada.
Annals of the New York Academy of Sciences
|June 18, 1999
Summary
Hematopoietic stem cells (HSCs) exhibit asymmetric cell division, leading to varied cell numbers and properties in progeny. This heterogeneity is crucial for maintaining long-term blood cell production.
Area of Science:
- Stem cell biology
- Hematopoiesis research
- Cell kinetics
Background:
- Long-term hematopoietic stem cell (HSC) function is critical for lifelong blood production.
- Understanding HSC cell kinetics and division patterns is essential for regenerative medicine and disease modeling.
Purpose of the Study:
- To investigate the cell kinetics and division patterns of single hematopoietic stem cells (HSCs).
- To determine if HSCs exhibit asymmetric cell divisions and how this impacts progeny heterogeneity.
Main Methods:
- Isolation and culture of single candidate HSCs from fetal liver.
- Culture in the presence of stimulatory cytokines.
- Recloning of single cells from slowly growing colonies.
Main Results:
- Single HSCs generated colonies with highly variable cell numbers (hundreds to thousands) within 8-10 days.
- Subclones derived from single cells also showed wide variations in cell numbers.
- These findings indicate uneven distribution of proliferative potential and cell cycle properties among daughter cells.
Conclusions:
- Asymmetric cell division is a key mechanism in primitive hematopoietic cells.
- This generates heterogeneity in cell cycle properties within HSC clonal progeny.
- Such heterogeneity is vital for sustained hematopoiesis in vitro and in vivo.