A potential cell affinity sorbent: fibronectin carrying poly(EGDMA/HEMA) microbeads

Area of Science:

• Biomaterials Science
• Cell Biology
• Polymer Chemistry

Background:

• Poly(EGDMA/HEMA) microbeads are versatile materials for biomedical applications.
• Cell adhesion is crucial for tissue engineering and cell-based assays.
• Modifying microbead surfaces can enhance specific cell interactions.

Purpose of the Study:

• To synthesize and characterize non-swellable and swellable poly(EGDMA/HEMA) microbeads.
• To immobilize fibronectin onto these microbeads using a spacer-arm (hexamethylene diamine, HMDA).
• To evaluate the attachment efficiency of fibroblastic (3T3) and epithelial (MDBK) cells to the modified microbeads.

Main Methods:

• Suspension copolymerization was used to produce poly(EGDMA/HEMA) microbeads.
• Microbeads were modified with HMDA and fibronectin, optimizing sodium periodate, HMDA, and glutaraldehyde concentrations.
• Cell attachment assays were performed using 3T3 and MDBK cells under various conditions.

Main Results:

• Optimal conditions for fibronectin immobilization included specific concentrations of sodium periodate, HMDA, glutaraldehyde, initial fibronectin concentration, temperature (25°C), pH 7, and immobilization time (120 min).
• Fibronectin adsorption was similar on plain and periodate-oxidized microbeads.
• Significantly high cell attachment, particularly of 3T3 cells (96%), was observed on fibronectin-immobilized swellable microbeads.

Conclusions:

• Modified poly(EGDMA/HEMA) microbeads, especially fibronectin-immobilized swellable ones, demonstrate excellent cell attachment capabilities.
• These findings suggest potential applications in cell culture, tissue engineering, and regenerative medicine.
• The study provides optimized parameters for fibronectin immobilization on polymer microbeads for enhanced cell adhesion.