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Updated: Aug 6, 2025
08:28
A Lab-On-A-Chip Platform for Stimulating Osteocyte Mechanotransduction and Analyzing Functional Outcomes of Bone Remodeling
Published on: May 21, 2020
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O2 variant chip to simulate site-specific skeletogenesis from hypoxic bone marrow
Hye-Seon Kim1, Hyun-Su Ha1, Dae-Hyun Kim2
1Department of Medical Engineering, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul 03722, Republic of Korea.
Science Advances
|March 22, 2023
Summary
Hypoxia maintains bone marrow mesenchymal stem cells (BMSCs) stemness. Oxygen gradients control stem cell fate, promoting chondrogenesis in low oxygen and osteogenesis in high oxygen for skeletal regeneration.
Area of Science:
- Stem Cell Biology
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Mesenchymal stem cells (MSCs) are crucial for skeletal development and regeneration.
- Oxygen levels vary significantly within the skeletal system, influencing stem cell behavior.
- Hypoxia is known to maintain the stemness of bone marrow mesenchymal stem cells (BMSCs).
Purpose of the Study:
- To investigate the role of oxygen gradients in directing BMSC differentiation towards chondrogenesis or osteogenesis.
- To develop a 3D culture system that mimics physiological oxygen gradients.
- To explore oxygen-mediated developmental mechanisms for skeletal regeneration.
Main Methods:
- Developed a 3D chip to create controlled oxygen gradients (low, medium, high).
- Cultured BMSCs within the 3D chip under varying oxygen conditions.
- Implanted cultured BMSCs into rabbit models of cartilage and bone defects.
Main Results:
- Low oxygen promoted BMSC stemness, chondrogenesis, and antioxidative potential.
- Intermediate oxygen levels induced BMSC quiescence.
- High oxygen levels promoted osteogenesis by disrupting redox balance and stemness.
Conclusions:
- Oxygen gradients are critical regulators of BMSC fate, directing differentiation pathways.
- Controlled oxygen environments can be used to promote specific skeletal tissue regeneration.
- Mimicking developmental oxygen transitions offers a novel strategy for skeletal repair.
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