The design of biodegradable microcarriers for induced cell aggregation

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Poly-L-lactic acid (PLLA) is a biodegradable polymer widely used in biomedical applications.
• Developing effective delivery systems for chondrocytes is crucial for cartilage repair strategies.
• Surface modification of biomaterials can enhance cell interaction and tissue regeneration.

Purpose of the Study:

• To functionalize PLLA microspheres with chitosan-graft-lactose.
• To evaluate the potential of these modified microspheres as injectable carriers for chondrocytes.
• To assess the impact of the modified microcarriers on chondrocyte behavior and extracellular matrix production.

Main Methods:

• Aminolysis of PLLA microspheres followed by glutaraldehyde treatment to introduce aldehyde groups.
• Covalent coupling of chitosan-graft-lactose to the functionalized PLLA microspheres via Schiff base formation.
• In vitro culture of rabbit auricular chondrocytes on the modified microcarriers and assessment of cell attachment, aggregation, viability, and extracellular matrix production.

Main Results:

• Successful immobilization of chitosan-graft-lactose onto PLLA microspheres was confirmed.
• The modified PLLA microcarriers effectively supported chondrocyte attachment and induced significant cell aggregation.
• The composite of cell aggregates and microcarriers exhibited enhanced cell viability and increased extracellular matrix production compared to controls.

Conclusions:

• Functionalized PLLA microspheres serve as effective microcarriers for chondrocytes.
• These microcarriers promote cell aggregation and improve chondrocyte function in vitro.
• The developed PLLA microcarriers show promise as an injectable delivery system for cartilage tissue engineering and repair.