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Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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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
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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...
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Development of the Heart01:27

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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
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Bone marrow contribution to the heart from development to adulthood.

Vasco Sampaio-Pinto1, Adrián Ruiz-Villalba2, Diana S Nascimento3

  • 1i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal; INEB - Instituto Nacional de Engenharia Biomédica, Universidade do Porto, Porto, Portugal; ICBAS - Instituto de Ciências Biomédicas de Abel Salazar, Universidade do Porto, Porto, Portugal; Department of Cardiology, CARIM School for Cardiovascular Diseases, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, the Netherlands; Department of Molecular Genetics, Faculty of Sciences and Engineering, Maastricht University, Maastricht, the Netherlands.

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Bone marrow-derived cells continuously infiltrate the heart, maintaining tissue health and influencing cardiac disease. Understanding these blood cells is key for developing new heart regeneration therapies.

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Area of Science:

  • Cardiovascular Biology
  • Hematology
  • Tissue Engineering

Background:

  • Cardiac tissue harbors diverse non-contractile interstitial cells, including significant populations of blood lineage-derived cells.
  • Blood cells colonize heart tissue before birth and are continuously recruited from the bone marrow throughout life.
  • Bone marrow is the primary source for replenishing circulating cells, playing a crucial role in cardiac cell incorporation.

Purpose of the Study:

  • To comprehensively review the functions of bone marrow-derived blood cells within the heart.
  • To explore the role of these cells in both steady-state cardiac homeostasis and disease progression.
  • To discuss their relevance in emerging cardiovascular research areas, such as cell-based heart regeneration.

Main Methods:

  • This review synthesizes existing literature on bone marrow-derived cells in the cardiovascular system.
  • It integrates findings from hematology, cardiology, and regenerative medicine research.
  • No new experimental data were generated; this is a review article.

Main Results:

  • Bone marrow-derived cells are integral to normal heart function and tissue maintenance.
  • These cells significantly impact the development and progression of cardiac diseases.
  • Their continuous recruitment highlights a dynamic interaction between the bone marrow and the heart.

Conclusions:

  • Bone marrow-derived cells are critical players in cardiac physiology and pathology.
  • Targeting or utilizing these cells holds promise for novel therapeutic strategies in cardiovascular medicine.
  • Further research into bone marrow-derived cell functions is essential for advancing cell-based heart regeneration.