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Ultrastructural studies on bone marrow development in embryonic mice
1Department of Medicine B, Hasharon Hospital, Golda Medical Center, Petah-Tiqva, Israel.
Abstract:
The hematopoietic events in the embryonic C57B1/6J mouse bone marrow have been followed by electron microscopy. The first type of cells to appear in the embryonic bone marrow were mesenchymal cells identified at day 15 of gestation. The first recognisable hemopoietic cells to appear were those of the granulocytic series identified as mature cells at day 18, although single red cell precursors were also found at this gestational stage. The real erythroid development was noted on the last days of gestation (days 20 and 21), when also cells of the megakaryocytic series were found. At birth, day one of newborn life, all hematopoietic elements were present. The pattern of hematopoietic development in the embryonic bone marrow was compared to that observed in other embryonic hematopoietic sites.
Insights
Hematopoietic stem cell development in embryonic mouse bone marrow begins with mesenchymal cells at day 15. Granulocytic cells appear by day 18, with erythroid and megakaryocytic development occurring later in gestation.
Area of Science:
- Developmental Biology
- Hematology
- Cell Biology
Background:
- Embryonic hematopoiesis is crucial for establishing blood cell populations.
- Understanding the temporal sequence of hematopoietic stem cell differentiation is vital.
Purpose of the Study:
- To characterize the sequential development of hematopoietic cells in embryonic C57B1/6J mouse bone marrow.
- To compare embryonic bone marrow hematopoiesis with other embryonic hematopoietic sites.
Main Methods:
- Electron microscopy was used to observe hematopoietic events.
- The study focused on the embryonic C57B1/6J mouse model.
Main Results:
- Mesenchymal cells were the first to appear (day 15).
- Granulocytic cells were identified as mature by day 18.
- Erythroid and megakaryocytic development occurred on days 20-21.
- All hematopoietic elements were present at birth.
Conclusions:
- The embryonic bone marrow follows a specific temporal pattern for hematopoietic cell development.
- This pattern involves the sequential emergence of different cell lineages.