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Related Concept Videos

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Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Stem Cell Niche01:26

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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...
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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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Related Experiment Video

Updated: Oct 29, 2025

Differentiation and Characterization of Osteoclasts from Human Induced Pluripotent Stem Cells
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Differentiation and Characterization of Osteoclasts from Human Induced Pluripotent Stem Cells

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A cell surface-reducing microenvironment induces early osteogenic commitment.

Hyunbum Kim1, Eun-Seo Lee1, Jiyong Kim2

  • 1School of Chemical and Biological Engineering, Seoul National University, Korea.

FEBS Letters
|July 10, 2021
PubMed
Summary
This summary is machine-generated.

A cell surface-reducing microenvironment promotes early osteogenic commitment in mesenchymal stem cells (MSCs). This approach enhances bone regeneration by influencing stem cell differentiation and neobone formation.

Keywords:
TGF-β signalingcell surface reductionmesenchymal stem cellmicroenvironmentosteogenesistris(2-carboxyethyl)phosphine

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Stem Cell Biology

Background:

  • Stem cell-based therapies offer promise for tissue regeneration.
  • Controlling stem cell differentiation is crucial for therapeutic success.
  • The cellular microenvironment significantly impacts stem cell behavior.

Purpose of the Study:

  • To investigate the effect of a mild reductant-induced microenvironment on early osteogenic commitment of mesenchymal stem cells (MSCs).
  • To elucidate the molecular mechanisms underlying the observed osteogenic commitment.
  • To evaluate the potential of this approach for in vivo bone regeneration.

Main Methods:

  • Exposure of MSCs to a cell surface-reducing microenvironment.
  • Analysis of the transforming growth factor (TGF)-β signaling pathway.
  • Assessment of focal adhesion and cell membrane protein dimerization.
  • In vivo transplantation of treated MSCs followed by analysis of neobone formation.

Main Results:

  • A reducing microenvironment significantly silenced the TGF-β signaling pathway in MSCs.
  • Increased focal adhesion and inhibited cell membrane protein dimerization were observed.
  • In vivo transplantation led to early osteogenic commitment and new bone formation.

Conclusions:

  • A cell surface-reducing microenvironment can effectively induce early osteogenic commitment in MSCs.
  • This approach modulates key signaling pathways and cellular interactions.
  • The findings suggest a novel strategy for enhancing bone regeneration therapies.