Functional tissue-engineered microtissue derived from cartilage extracellular matrix for articular cartilage...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Cartilage repair remains a significant challenge in regenerative medicine.
• Existing tissue engineering strategies require further optimization for effective cartilage regeneration.

Purpose of the Study:

• To develop and evaluate cartilage extracellular matrix-derived particles (CEDPs) as a cell carrier for cartilage regeneration.
• To investigate the efficacy of CEDPs in supporting chondrocyte and stem cell proliferation and differentiation.
• To assess the in vivo performance of CEDP-based microtissues for articular cartilage repair.

Main Methods:

• CEDPs were fabricated from articular cartilage through physical and chemical processing.
• Articular chondrocytes (ACs) and adipose-derived stem cells (ASCs) were cultured on CEDPs under static and microgravity conditions.
• Gene expression analysis was performed to evaluate chondrogenic phenotypes.
• In vivo studies involved implanting AC- or ASC-laden CEDP microtissues into rabbit osteochondral defects.

Main Results:

• CEDPs facilitated rapid attachment and proliferation of ACs and ASCs with high viability.
• ACs on CEDPs showed enhanced chondrogenic phenotype, while ASCs differentiated into chondrocytes without exogenous growth factors.
• Microgravity culture in a rotary cell culture system (RCCS) superiorly maintained chondrogenesis compared to static culture.
• In vivo, AC- and ASC-based CEDP microtissues resulted in significant hyaline cartilage repair, outperforming CEDPs alone or fibrin glue.

Conclusions:

• CEDPs serve as an effective cell carrier for cartilage tissue engineering.
• Microgravity culture enhances chondrogenic potential within CEDP constructs.
• CEDP-based microtissues represent a promising strategy for in vivo articular cartilage regeneration.