Cartilage Lacuna-Inspired Microcarriers Drive Hyaline Neocartilage Regeneration

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Hydrogel-based cartilage equivalents show promise for hyaline cartilage regeneration.
• Current methods struggle to culture undifferentiated chondrocytes and reconstruct cartilage architecture in vitro.

Purpose of the Study:

• To develop novel lacunar hyaluronic acid microcarriers (LHAMCs) that promote chondrocyte redifferentiation and hyaline cartilage regeneration.
• To investigate the role of LHAMCs in regulating chondrocyte fate and extracellular matrix remodeling.

Main Methods:

• Fabrication of LHAMCs using hyaluronic acid (HA) and collagen type I with a gas foaming technique.
• 3D culture of chondrocytes on LHAMCs to assess cell behavior and matrix formation.
• Inhibition of the Wnt/β-catenin pathway to prevent chondrocyte dedifferentiation.
• Subcutaneous implantation in a mouse model to evaluate neocartilage formation and cytocompatibility.

Main Results:

• LHAMCs successfully cultured chondrocytes, promoting hyaline cartilaginous microtissue regeneration.
• Geometric constraints on LHAMCs prevented the anaerobic-to-aerobic metabolism transition in chondrocytes.
• LHAMCs inhibited the Wnt pathway, repressing chondrocyte dedifferentiation.
• Subcutaneous implantation demonstrated favorable cytocompatibility and robust neocartilage formation.

Conclusions:

• LHAMCs provide a novel strategy for regulating chondrocyte dedifferentiation and promoting hyaline cartilage regeneration.
• The study highlights the importance of geometrical cues in mechanotransduction for controlling cell fate in tissue engineering.
• LHAMCs offer a promising platform for advancing cartilage tissue engineering and regenerative medicine.