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Growth of Cartilage and Bone Tissue

Growth of Cartilage and Bone Tissue

Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...

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Matrix-assisted Autologous Chondrocyte Transplantation for Remodeling and Repair of Chondral Defects in a Rabbit Model

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Tissue Engineering of Cartilage Using a Random Positioning Machine.

Markus Wehland¹, Paul Steinwerth¹, Ganna Aleshcheva¹

¹Department of Microgravity and Translational Regenerative Medicine, Clinic for Plastic, Aesthetic and Hand Surgery, Otto von Guericke University, 39106 Magdeburg, Germany.

International Journal of Molecular Sciences

|December 19, 2020

Summary

Human articular chondrocytes cultured under simulated microgravity formed cartilage-like spheroids. This novel approach shows potential for regenerating damaged cartilage tissue and treating osteoarthritis.

Keywords:

cartilage random positioning machine scaffold-free spheroids tissue engineering

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Area of Science:

Biomaterials Science
Tissue Engineering
Cell Biology

Background:

Articular cartilage damage, often due to osteoarthritis, has limited self-repair capacity, necessitating joint replacement.
Developing methods for chondrocyte-driven cartilage regeneration is crucial for restoring joint function.

Purpose of the Study:

To investigate the in vitro production of cartilage-like tissue using human articular chondrocytes under simulated microgravity.
To analyze early cellular responses and tissue development in response to Random Positioning Machine (RPM) exposure.

Main Methods:

Human articular chondrocytes were cultured using the Random Positioning Machine (RPM) to simulate microgravity.
Quantitative real-time PCR was used to analyze gene expression changes after 24 hours.
Three-dimensional (3D) spheroid formation and cartilage morphology were assessed over 28 days using specific culture media.

Main Results:

Significant upregulation of key genes (e.g., IL6, RUNX2, SOX9, MMP13) involved in cartilage formation was observed.
Scaffold-free 3D cartilage-like spheroids formed within 5-14 days, depending on the medium.
Constructs exhibited typical cartilage morphology with aggrecan positivity and suitable for transplantation.

Conclusions:

Simulated microgravity promotes the formation of cartilage-like tissue from human chondrocytes.
Cultivation medium significantly influences the speed and composition of tissue formation.
These chondrocyte spheroids are promising for cellular cartilage regeneration in trauma and osteoarthritis therapy.