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Embryonic and fetal hemopoiesis: an overview
1Department of Veterans Affairs Medical Center, Jackson, MS 39216.
Blood Cells
|January 1, 1991
Summary
Embryonic and fetal development involves distinct stages of blood cell formation (hemopoiesis) in the yolk sac, liver, spleen, and bone marrow. This review details the cellular and molecular shifts in hemopoietic stem cells (HSC) during development.
Area of Science:
- Developmental Biology
- Hematology
- Stem Cell Biology
Background:
- Embryonic and fetal development feature dynamic shifts in blood cell production sites.
- Hemopoiesis transitions from primitive to definitive forms throughout gestation.
Purpose of the Study:
- To critically review current knowledge of embryonic and fetal hemopoiesis.
- To discuss the migration and functional changes of hemopoietic stem cells (HSC) across different developmental stages.
Main Methods:
- Review of existing literature on murine and human hemopoiesis.
- Analysis of cellular and embryological features of hemopoiesis.
- Integration of molecular understanding of stem cell homing.
Main Results:
- Early hemopoiesis occurs in the yolk sac, supporting primitive erythropoiesis.
- Liver and spleen become primary sites for definitive hemopoiesis, producing various blood cell types.
- Bone marrow eventually becomes the predominant site for granulopoiesis.
Conclusions:
- Hemopoiesis undergoes sequential site switching and functional maturation during embryonic and fetal development.
- Understanding these transitions is crucial for comprehending normal hematopoiesis and related disorders.