Fibrinogen adsorption and host tissue responses to plasma functionalized surfaces

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Tissue Engineering
• Immunology

Background:

• The physical and chemical properties of biomaterial surfaces are critical for modulating host tissue responses.
• Understanding how specific surface chemistries influence biological interactions is essential for designing effective biomaterials.

Purpose of the Study:

• To investigate the role of discrete biomaterial surface functional groups in modifying host tissue responses.
• To elucidate the relationship between surface chemistry, protein adsorption/denaturation, and subsequent inflammatory and fibrotic reactions.

Main Methods:

• Fabrication of surfaces with distinct functional groups (-OH, -NH2, -CF3, siloxyl) using radio frequency glow discharge plasma polymerization.
• Evaluation of surface:protein:cell interactions in vitro and in vivo using polyethylene terephthalate controls.
• Analysis of fibrinogen adsorption, denaturation, and acute inflammatory and fibrotic responses.

Main Results:

• Surface functionalities significantly influence the adsorption and denaturation of fibrinogen, a key mediator of inflammatory responses.
• Different surface chemistries elicited varying degrees of acute inflammatory responses, correlating with the amount of denatured fibrinogen.
• Most tested surfaces, except for siloxyl groups, induced similar fibrotic responses, suggesting surface chemistry alone may not control this outcome.

Conclusions:

• Surface functional groups play a significant role in modulating initial protein interactions and acute inflammatory responses to biomaterials.
• The degree of fibrinogen denaturation and irreversible binding on a surface is closely linked to the intensity of the acute inflammatory reaction.
• Surface chemistry alone may not be sufficient to dictate long-term fibrotic responses, indicating other factors are involved.