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Related Concept Videos

Hematopoiesis01:21

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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Proteoglycans01:05

Proteoglycans

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Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...
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Matrix Proteoglycans and Glycoproteins01:21

Matrix Proteoglycans and Glycoproteins

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Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...
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Production of Formed Elements01:34

Production of Formed Elements

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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.
Most HSCs commit to...
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Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

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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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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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In Vivo Osteo-organoid Approach for Harvesting Therapeutic Hematopoietic Stem/Progenitor Cells
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Proteoglycan synthesis by hematopoietic progenitor cells.

J J Minguell1, M Tavassoli

  • 1Department of Research, Veterans Administration Medical Center, Jackson, MS 39216.

Blood
|May 15, 1989
PubMed
Summary

Hematopoietic progenitor cells synthesize chondroitin sulfate proteoglycans (CSPG). Membrane-associated CSPG stability increases with stromal cell presence, suggesting a role in cell interactions.

Area of Science:

  • Hematology
  • Cell Biology
  • Biochemistry

Background:

  • Proteoglycan (PG) synthesis is known in hematopoietic stromal cells.
  • PG synthesis by hematopoietic progenitor cells remains unexplored.
  • Hematopoietic progenitor cells are crucial for blood cell formation.

Purpose of the Study:

  • To investigate proteoglycan synthesis in hematopoietic progenitor cells.
  • To characterize the cellular distribution and molecular properties of PGs.
  • To explore the potential role of PGs in progenitor-stromal cell interactions.

Main Methods:

  • Utilized a cloned interleukin-3 (IL-3)-dependent hematopoietic progenitor cell line (FDCP-1).
  • Studied PG synthesis via 35S-sulfate labeling.
  • Analyzed PG distribution (intracellular, membrane-associated, extracellular) and molecular characteristics using chromatography and ion-exchange techniques.

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Main Results:

  • FDCP-1 cells actively synthesize chondroitin sulfate-PG (CIS-PG).
  • CIS-PG was found in intracellular, membrane-associated (MP), and extracellular pools.
  • Membrane-associated CIS-PG stability is enhanced in the presence of hematopoietic stromal cells.

Conclusions:

  • Hematopoietic progenitor cells synthesize and distribute chondroitin sulfate-PGs.
  • The stability of membrane-associated PGs is influenced by stromal cells.
  • PG synthesis and membrane accumulation may play a role in progenitor-stromal cell interactions.