Dominant Role of Distinct Microenvironments on Cartilage Regeneration Fate Using PLGA-Hydrogel Composite Scaffolds

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Bioactive composite scaffolds are crucial for cartilage tissue engineering.
• The influence of distinct microenvironments on cartilage regeneration remains unclear.
• Understanding microenvironmental effects is key for optimizing cartilage repair strategies.

Purpose of the Study:

• To investigate the role of different microenvironments on cartilage regeneration and long-term outcomes.
• To develop and utilize a universal composite scaffold for exploring microenvironmental influences.
• To compare cartilage regeneration in situ (auricle), ex situ (subcutaneous), and osteogenic (cranial) sites.

Main Methods:

• Development of a universal composite scaffold using 3D-printed poly(lactic-co-glycolic acid) and cartilage-specific hydrogels.
• Systematic exploration of the microenvironment's role in cartilage regeneration fate.
• Evaluation of regenerative cartilage in distinct anatomical locations.

Main Results:

• The in situ auricular microenvironment promotes cartilage maturation and chondrogenic phenotype maintenance.
• Ex situ subcutaneous sites result in chondrogenic phenotype loss due to immune responses and vascularization.
• Osteogenic cranial sites facilitate initial cartilage regeneration, followed by bone replacement, successfully repairing cranial defects.

Conclusions:

• Microenvironment dictates the fate and long-term outcomes of engineered cartilage.
• In situ auricular environment is optimal for maintaining chondrogenic phenotype.
• Findings provide theoretical basis and practical guidance for optimizing cartilage regeneration strategies.