Related Experiment Videos
Development of hematopoietic stem cell activity in the mouse embryo
A M Müller1, A Medvinsky, J Strouboulis
1Laboratory of Gene Structure and Expression, National Institute for Medical Research, Mill Hill, London, England.
Immunity
|July 1, 1994
Summary
Hematopoietic stem cell activity appears early in the mouse embryo's aorta-gonad-mesonephros (AGM) region, preceding yolk sac and liver development. AGM-derived cells fully repopulated recipients, establishing a model for stem cell maturation.
Area of Science:
- Developmental biology
- Hematopoiesis
- Stem cell research
Background:
- The exact timing of the first hematopoietic stem cell (HSC) emergence during mouse embryogenesis remains unclear.
- The aorta-gonad-mesonephros (AGM) region has demonstrated hematopoietic colony-forming activity (CFU-S) in recipient mice.
Purpose of the Study:
- To ascertain if the mouse embryo's AGM region harbors definitive HSC activity.
- To establish the chronological order of stem cell appearance in the yolk sac, AGM region, and liver.
Main Methods:
- Transfer of embryonic tissues (yolk sac, AGM region, liver) from developing mouse embryos into adult irradiated recipient mice.
- Assessment of long-term hematopoietic repopulation capacity in primary and serial recipients.
Main Results:
- Demonstrated long-term, complete, and functional hematopoietic repopulation by AGM-derived cells in recipients.
- Observed potent HSC activity in the AGM region prior to its detection in the yolk sac and liver.
Conclusions:
- The AGM region is a critical site for early definitive HSC generation in mouse development.
- A model for the sequential maturation of stem cell activity during mouse embryogenesis is proposed, with the AGM region initiating the process.