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    Area of Science:

    • Biomaterials Science
    • Surface Chemistry
    • Hematology

    Background:

    • Plasma protein adsorption, especially fibrinogen, at the endoendothelial interface and on blood cells is crucial for hemostasis and thrombogenesis.
    • The intact endothelium is the most thrombo-resistant surface known, and its properties are vital for creating biocompatible implants and prosthetic devices.
    • Under physiological conditions, the endoendothelial surface, blood cells, and plasma proteins share net negative charges, influencing their interactions.

    Purpose of the Study:

    • To investigate the role of plasma protein adsorption, specifically fibrinogen, in the interactions between blood components and surfaces.
    • To explore the physicochemical basis of endothelial thromboresistance and its implications for biomaterial development.
    • To understand the contribution of surface charge and local pH variations to blood-surface interactions.

    Main Methods:

    • Physicochemical analysis of surface charge and pH.
    • Review of existing literature on protein adsorption and blood-surface interactions.
    • Investigation of fibrinogen's role in platelet aggregation and surface charge changes.

    Main Results:

    • Fibrinogen adsorption is expected on both endothelial surfaces and blood cellular elements (erythrocytes, platelets).
    • Surface charge density and ionizable groups significantly influence local pH, affecting molecular interactions.
    • Fibrinogen is essential for platelet aggregation induced by adenosine diphosphate and influences platelet surface charge.

    Conclusions:

    • Electrostatic interactions are fundamental to the contact relationships between blood cells and both natural and foreign surfaces.
    • Understanding fibrinogen adsorption and surface charge phenomena is critical for designing effective blood-contacting medical devices.
    • The thromboresistant nature of the endothelium is linked to its surface properties and protein interactions, offering insights for biomaterial design.