Cell behavior on the alginate-coated PLLA/PLGA scaffolds

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• Poly(lactic-co-glycolic acid) (PLLA/PLGA) scaffolds are widely used in tissue engineering.
• Scaffold properties like pore size and stiffness influence cell behavior.
• Alginate coating can modify scaffold surface characteristics.

Purpose of the Study:

• To investigate the effects of preparation temperature and alginate coating on L929 fibroblast behavior.
• To understand how scaffold microstructure and surface chemistry influence cell adhesion, proliferation, and morphology.
• To determine optimal conditions for fibroblast integration with PLLA/PLGA scaffolds.

Main Methods:

• Lyophilization of PLLA/PLGA (95:5, w/w) scaffolds at two different freezing temperatures (-80°C and -20°C).
• Coating of scaffolds with alginate hydrogel.
• Assessment of scaffold properties (pore size, compressive modulus).
• Evaluation of L929 fibroblast behavior (proliferation, adhesion, morphology, metabolic activity).

Main Results:

• Lower freezing temperature (-80°C) yielded smaller pores (50 μm) and higher stiffness (1500 kPa).
• Higher freezing temperature (-20°C) resulted in larger pores (120 μm) and lower stiffness (600 kPa).
• Alginate coating reduced cell proliferation (p<0.05) due to weak adhesion, rapid degradation, and pH decrease.
• Fibroblast morphology became more branched on scaffolds with stiffness closer to that of the cells, particularly with alginate coating.

Conclusions:

• Preparation temperature significantly alters the physical properties of PLLA/PLGA scaffolds.
• Alginate coating negatively impacts L929 fibroblast proliferation but promotes a more branched morphology.
• Scaffold stiffness matching cell stiffness is crucial for achieving desired fibroblast morphology, suggesting potential for tailored biomaterial design.