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Related Concept Videos

Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
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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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Stem Cell Niche01:26

Stem Cell Niche

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The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
6.5K
Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

4.1K
Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
4.1K
Activation of Integrins01:15

Activation of Integrins

5.3K
Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding...
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Related Experiment Video

Updated: Mar 1, 2026

Bioengineering of Humanized Bone Marrow Microenvironments in Mouse and Their Visualization by Live Imaging
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Bioengineering of Humanized Bone Marrow Microenvironments in Mouse and Their Visualization by Live Imaging

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Bone marrow niche-mimetics modulate HSPC function via integrin signaling.

Martin Kräter1, Angela Jacobi2, Oliver Otto3

  • 1Medical Clinic I, University Hospital Carl Gustav Carus, Dresden, Saxony, 01307, Germany.

Scientific Reports
|June 2, 2017
PubMed
Summary
This summary is machine-generated.

Hematopoietic stem and progenitor cells (HSPCs) interact with bone marrow extracellular matrix (ECM) scaffolds. This interaction enhances HSPC expansion and migration by activating integrin signaling pathways.

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Combining Intravital Fluorescent Microscopy IVFM with Genetic Models to Study Engraftment Dynamics of Hematopoietic Cells to Bone Marrow Niches
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Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis
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Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis

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Last Updated: Mar 1, 2026

Bioengineering of Humanized Bone Marrow Microenvironments in Mouse and Their Visualization by Live Imaging
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Combining Intravital Fluorescent Microscopy IVFM with Genetic Models to Study Engraftment Dynamics of Hematopoietic Cells to Bone Marrow Niches
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Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis
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Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis

Published on: April 10, 2012

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Area of Science:

  • Biomedical Engineering
  • Stem Cell Biology
  • Cellular Microenvironment

Background:

  • The bone marrow microenvironment provides physical cues essential for hematopoietic stem and progenitor cell (HSPC) maintenance and fate.
  • Current stem cell culture methods often lack these crucial matrix interactions, typically using suspension cultures.
  • Mechanisms of extracellular matrix (ECM) communication and signal transduction in stem cell maintenance are not fully understood.

Purpose of the Study:

  • To investigate hematopoietic stem and progenitor cell (HSPC) interactions with bone marrow-mimetic decellularized extracellular matrix (ECM) scaffolds.
  • To elucidate the role of ECM in modulating HSPC behavior and function.

Main Methods:

  • Utilized decellularized extracellular matrix (ECM) scaffolds derived from mesenchymal stromal cells (MSCs) to mimic the bone marrow microenvironment.
  • Isolated and cultured hematopoietic stem and progenitor cells (HSPCs) on these scaffolds, categorizing them into adherent (AT) and non-adherent (SN) populations.
  • Analyzed cell mechanics, migration, expansion, and gene expression (integrin induction).

Main Results:

  • Adherent (AT) HSPCs exhibited enhanced expansion and active migration compared to non-adherent (SN) cells.
  • ECM-incorporated stromal derived factor one mediated enhanced HSPC expansion and migration.
  • AT-cells demonstrated distinct cell deformation, indicating physical recognition of ECM properties via focal adhesions.
  • Integrins αIIb (CD41), αV (CD51), and β3 (CD61) were induced in adherent cells.
  • Focal contacts signaling via ITGβ3 were identified as key mediators of cell adhesion, migration, and ECM-mediated physical cue transduction.

Conclusions:

  • Bone marrow-mimetic ECM scaffolds promote enhanced hematopoietic stem and progenitor cell (HSPC) expansion and migration.
  • Physical recognition of ECM properties by HSPCs, mediated by integrin signaling, is crucial for modulating cell function.
  • These findings highlight the importance of the cellular microenvironment in stem cell maintenance and suggest potential for improved stem cell culture and therapeutic strategies.