Embryonic Hematopoiesis
Embryonic Hematopoiesis - Related Videos
01:21
Hematopoiesis
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2025
The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
01:20
Overview of Hematopoiesis
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2024
Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs). Developmental Phases of Hematopoiesis Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
11:50
Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis
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Cited by 9 •
2012
A 3D culture system for hematopoiesis is described using human cord blood and leukemic bone marrow cells. The method is based on the use of a porous synthetic polyurethane scaffold coated with extracellular matrix proteins. This scaffold is adaptable to accommodate a wide range of cells.
10:51
A System for ex vivo Culturing of Embryonic Pancreas
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Cited by 23 •
2012
Here, we describe a method for isolation, culture and manipulation of mouse embryonic pancreas. This represents an excellent ex vivo system for studying various aspects of pancreatic development, including morphogenesis, differentiation and growth. Pancreatic bud explants can be cultured for several days and used in a range of different applications, including whole-mount immunofluorescence and live imaging.
07:38
Application of Aorta-gonad-mesonephros Explant Culture System in Developmental Hematopoiesis
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Cited by 2 •
2017
This protocol describes using cultured Aorta-Gonad-Mesonephros for expression analyses, colony-forming units in the culture and spleen, and long-term reconstitution to determine the effect of regulatory factors and signaling pathways on hematopoietic stem cell development. This has been demonstrated as an effective system for studying hematopoietic stem cell biology and function.
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During the endothelial-to-hematopoietic transition, specialized hemogenic endothelial cells in the aorta-gonad-mesonephros region give rise to definitive hematopoietic stem cells. This step is important because it connects an endothelial developmental program with the production of stem cells capable of establishing long-term blood formation. Studying this transition helps researchers identify developmental programs that may later become altered in leukemia.
Primitive hematopoiesis provides the earliest blood production in the yolk sac, whereas definitive hematopoiesis produces hematopoietic stem cells that support the lifelong blood-forming system. This distinction separates an initial developmental phase from the later establishment of durable stem-cell production. In cancer research, comparing these programs can help clarify which normal stem-cell features are disrupted during leukemia development.
The changing locations reflect successive stages in blood-system development. After their emergence in the aorta-gonad-mesonephros region, hematopoietic stem cells expand and mature in sites such as the fetal liver before establishing long-term production in bone marrow. Following this sequence allows researchers to examine how developmental environment and timing support stem-cell expansion, maturation, and eventual maintenance.
Embryonic hematopoiesis provides a normal developmental framework for examining how stem-cell programs are regulated before disease-associated alterations occur. By tracing the progression from early blood production to definitive stem-cell establishment, researchers can compare healthy developmental states with abnormal programs found in leukemia. This comparison supports investigation of disease mechanisms and the design of more targeted therapeutic strategies.
Its developmental stages help researchers build disease models that reflect the normal origins and maturation of blood-forming stem cells. Such models can be used to investigate how ordinary stem-cell programs become altered in leukemia, rather than examining malignant blood production without developmental context. The resulting comparisons may improve understanding of disease biology and support evaluation of targeted therapeutic approaches.
Examining the sequence of blood formation can show when normal stem-cell programs emerge, expand, mature, and become established for long-term production. Researchers can then use these stages as reference points when studying altered programs in leukemia. This developmental comparison helps distinguish changes associated with stem-cell establishment from those linked to later blood-system maintenance.
The process identifies developmental stages that establish and maintain blood-forming stem cells, making it relevant to efforts aimed at understanding or supporting blood-system regeneration. In cancer research, the same knowledge can guide strategies that target abnormal stem-cell programs rather than treating blood production as a single undifferentiated process. Its value therefore extends from developmental biology to therapeutic planning.