Surface characterization, collagen adsorption and cell behaviour on poly(L-lactide-co-glycolide)

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Chemistry

Background:

• Poly(L-lactide-co-glycolide) (PLG) is a biodegradable polymer with potential in tissue engineering.
• Improving cell interaction with biomaterials is crucial for effective tissue regeneration.
• Surface properties significantly influence cell behavior on biomaterials.

Purpose of the Study:

• To enhance the behavior of fibroblasts and osteoblasts on Poly(L-lactide-co-glycolide) (PLG) surfaces.
• To investigate the effect of collagen adsorption on PLG surface properties and cell interactions.
• To compare PLG with reference materials like polystyrene (PS) and tissue-culture polystyrene (TCPS).

Main Methods:

• Surface modification of PLG via collagen adsorption.
• Physicochemical surface characterization using X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and water contact angle measurements.
• Cell culture studies evaluating fibroblast and osteoblast morphology, growth (crystal violet, MTT assays), nitric oxide levels, and protein secretion.

Main Results:

• Collagen adsorption was influenced by the hydrophobicity of the PLG surface.
• Cell attachment, spreading, and growth on native substrates followed the order: PS < PLG < TCPS.
• Collagen coating on PLG significantly improved cell number, spreading, distribution, growth, and protein secretion compared to uncoated PLG.

Conclusions:

• Surface modification of PLG by collagen adsorption effectively promotes fibroblast and osteoblast distribution and proliferation.
• Collagen-coated PLG demonstrates enhanced biocompatibility for cell adhesion and growth.
• This strategy offers a promising approach for developing improved biomaterials for regenerative medicine.