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Haemopoietic stem cells in the foetal mouse thymus
The Australian Journal of Experimental Biology and Medical Science
|April 1, 1978
Summary
Haemopoietic stem cells (HSC) in fetal mouse thymus retain multipotency. These fetal-thymus derived HSC can form diverse differentiated colonies, indicating ongoing stem cell potential during development.
Area of Science:
- Developmental Biology
- Hematology
- Immunology
Background:
- The fetal thymus is crucial for T-cell development.
- Understanding the origin and potential of cells populating the fetal thymus is key to comprehending immune system development.
Purpose of the Study:
- To investigate the presence and multipotentiality of haemopoietic stem cells (HSC) within the fetal mouse thymus.
- To determine if cells entering the fetal thymus are precommitted or retain stem cell potential.
Main Methods:
- Utilized the Till and McCulloch spleen colony assay to detect and quantify HSC.
- Assessed HSC activity in fetal mouse thymus from 13 days of gestation to birth.
Main Results:
- A peak of stem cell activity was observed in the 15-day fetal thymus.
- Thymus-derived HSC formed smaller colonies than liver-derived HSC but demonstrated multipotency.
- Histological analysis identified five distinct colony types from thymus-derived HSC, indicating broad differentiation potential.
Conclusions:
- Haemopoietic stem cells (HSC) are present in the fetal mouse thymus.
- These HSC retain multipotentiality, capable of forming various differentiated cell types.
- The fetal thymus harbors stem cells that are not yet fully committed to thymocyte differentiation.