Microsphere-based scaffolds encapsulating chondroitin sulfate or decellularized cartilage

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Extracellular matrix (ECM) materials like decellularized cartilage (DCC) and chondroitin sulfate (CS) show promise for cartilage regeneration.
• Microsphere-based scaffolds offer a versatile platform for delivering these ECM components.

Purpose of the Study:

• To investigate the effects of encapsulating DCC and CS within poly(D,L-lactic-co-glycolic acid) microsphere scaffolds.
• To test if DCC and CS encapsulation induces chondrogenesis in rat bone marrow stromal cells (rBMSCs).

Main Methods:

• Fabrication of four scaffold types: Blank, TGF-β3, DCC-encapsulated, and CS-encapsulated poly(D,L-lactic-co-glycolic acid) microspheres.
• Seeding scaffolds with rBMSCs and culturing for 6 weeks.
• Analysis of scaffold morphology, mechanical properties, biochemical markers (glycosaminoglycan content), and gene expression.

Main Results:

• DCC and CS encapsulation increased scaffold porosity and altered mechanical properties, with CS showing the highest compressive modulus.
• Biochemical assays indicated a mitogenic effect and boosted matrix synthesis in rBMSCs, with significant increases in glycosaminoglycan content in DCC and CS groups.
• Gene expression analysis revealed that DCC and CS encapsulation suppressed rBMSC chondrogenesis, with distinct patterns between the two groups.

Conclusions:

• DCC and CS can be effectively incorporated into microsphere scaffolds, influencing cell proliferation and matrix production.
• While promoting matrix synthesis, DCC and CS demonstrated a suppressive effect on chondrogenesis, necessitating further optimization of their concentrations for effective cartilage regeneration in vitro.