Nanocoatings containing sulfated polysaccharides prepared by layer-by-layer assembly as models to study cell-material...

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Chemistry

Background:

• Cell-extracellular matrix (ECM) and cell-material interactions are vital for biomaterial success in tissue engineering.
• Natural ECM is rich in sulfated and aminated glycosaminoglycans and proteoglycans.
• Synthetic models replicating these chemical groups are of significant interest.

Purpose of the Study:

• To develop and characterize novel polysaccharide-based nanocoatings.
• To investigate the influence of sulfate groups on osteoblast-like cell behavior.
• To create biomimetic models for studying cell-material interactions.

Main Methods:

• Layer-by-layer assembly of chitosan with κ-, ι-, and λ-carrageenan to create multilayers with varying sulfur content.
• Characterization using quartz crystal microbalance with dissipation (QCM-D), atomic force microscopy (AFM), scanning electron microscopy (SEM), water contact angle, and X-ray photoelectron spectroscopy (XPS).
• In vitro study of osteoblast-like cell response to the nanocoatings.

Main Results:

• Nanostructured multilayers with controlled sulfur and nitrogen content were successfully fabricated.
• Biomimetic coatings significantly increased alkaline phosphatase (ALP) activity and proliferation compared to unmodified polycaprolactone surfaces.
• A notable increase in biomineralization was observed, particularly with ι-carrageenan coatings, indicating a positive interaction of sulfate groups with osteoblastic activity.

Conclusions:

• The developed nanocoatings effectively mimic key chemical features of the natural ECM.
• Sulfate groups on the nanocoatings positively influence osteoblast-like cell behavior, including proliferation and biomineralization.
• These nanocoatings serve as valuable models for understanding the biological impact of sulfate and amine groups on biomaterial surfaces.