The effect of IGF-I on anatomically shaped tissue-engineered menisci

Area of Science:

• Biomaterials Engineering
• Tissue Engineering
• Orthopedic Research

Background:

• Meniscal tears are common injuries impacting knee function.
• Current treatments for meniscal damage have limitations.
• Developing functional engineered meniscus tissue is crucial for regenerative medicine.

Purpose of the Study:

• To investigate the impact of insulin-like growth factor (IGF)-I on the development of anatomically-shaped alginate-based meniscus constructs.
• To evaluate the biochemical, mechanical, and histological properties of engineered menisci with and without IGF-I treatment.

Main Methods:

• Bovine meniscal fibrochondrocytes were seeded in alginate and cultured in anatomical molds.
• Constructs were treated with or without 100 ng/mL IGF-I for up to 4 weeks.
• Analyses included histology, immunohistochemistry, biochemistry, and mechanical testing.

Main Results:

• IGF-I significantly increased glycosaminoglycan (GAG) and collagen content (26-fold and 10-fold increases, respectively).
• IGF-I treatment improved mechanical properties, matching native tissue modulus by 2 weeks.
• Engineered tissues developed a distinct surface layer with aligned cells and collagen, resembling native menisci.

Conclusions:

• IGF-I significantly enhances the development of engineered meniscus tissue in alginate scaffolds.
• IGF-I promotes improved biochemical composition and mechanical function.
• This approach aids in creating engineered meniscus with a native-like superficial zone, showing promise for clinical applications.