Prospective Application of Partially Digested Autologous Chondrocyte for Meniscus Tissue Engineering

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Orthopedic Research

Background:

• Meniscus tissue engineering faces challenges due to the need for chondrogenic induction and in vitro cell expansion.
• Successful cartilage engineering using autologous chondrocytes highlights the potential for similar approaches in meniscus repair.
• Demonstrating the inherent chondrogenic potential of meniscus cells is crucial for advancing clinical applications in meniscus tissue engineering.

Purpose of the Study:

• To investigate the intrinsic chondrogenic potential of meniscus cells.
• To compare the chondrogenic properties of inner, middle, and outer meniscus cells.
• To evaluate the chondrogenic phenotype of meniscus cells before and after in vitro expansion.

Main Methods:

• Tissues from 10 menisci and cartilage were collected during total knee replacements.
• Cells were isolated and expanded in vitro.
• Chondrogenic properties were assessed using immunohistofluorescence and gene expression analyses.

Main Results:

• Native cartilage and inner/middle meniscus showed collagen II and aggrecan presence; outer meniscus lacked collagen II and aggrecan.
• Passage 2 chondrocytes expressed collagen II and aggrecan, unlike outer meniscus cells which only expressed vimentin.
• Inner and middle meniscus cells exhibited higher collagen II and aggrecan gene expression than outer meniscus cells, with native cells showing the most robust potential.

Conclusions:

• Inner and middle meniscus cells possess a chondrogenic phenotype without requiring external induction.
• Native meniscus cells demonstrate a more significant chondrogenic potential than cells cultured in a passage 2 monolayer.
• These findings support the clinical value of meniscus tissue engineering by highlighting the inherent regenerative capacity of meniscus-derived cells.