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Related Experiment Videos

Chondrocyte gene expression under applied surface motion.

Sibylle Grad1, Cynthia R Lee, Markus A Wimmer

  • 1Biomaterials and Tissue Engineering Program, AO Research Institute, Davos, Switzerland. sibylle.grad@aofoundation.org

Biorheology
|August 17, 2006
PubMed
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Articular motion in a novel bioreactor significantly boosted gene expression for lubricating molecules in cartilage tissue engineering. This functional stimulation helps preserve the chondrocytic phenotype, crucial for joint health.

Area of Science:

  • Biomedical Engineering
  • Tissue Engineering
  • Orthopedics

Background:

  • Cartilage degeneration necessitates advanced tissue engineering solutions.
  • Understanding chondrocyte response to mechanical stimuli is key for functional cartilage regeneration.
  • Superficial Zone Protein (SZP)/lubricin is vital for joint lubrication.

Purpose of the Study:

  • To investigate the effect of articular motion on chondrocyte gene expression in 3D scaffolds.
  • To analyze the impact of a novel cartilage bioreactor on lubricating molecule production.
  • To determine if articular motion preserves the chondrocytic phenotype.

Main Methods:

  • Designed a cartilage bioreactor to simulate joint kinematics.
  • Seeded porous polyurethane scaffolds with bovine articular chondrocytes.

Related Experiment Videos

  • Applied dynamic compression with and without articulation against a ceramic hip ball.

    • Main Results:

    • Articular motion significantly upregulated mRNA expression of SZP/lubricin isoforms and COMP.
    • Other matrix proteins like aggrecan and type II collagen were moderately upregulated.
    • Axial compression alone did not affect chondrocyte gene expression levels.

    Conclusions:

    • Articular motion is beneficial for stimulating lubricating molecules in engineered cartilage.
    • The applied motion helps preserve the essential chondrocytic phenotype.
    • This bioreactor design facilitates functional cartilage tissue engineering studies.