Experimental Study of Fibrin/Fibrin-Specific Molecular Interactions Using a Sphere/Plane Adhesion Model

Area of Science:

• Biophysics
• Materials Science
• Hematology

Background:

• Fibrin, a key biopolymer in blood coagulation, contributes to arterial thrombus stability under shear stress.
• The specific interactions and bond strength between fibrin monomers remain poorly understood.

Purpose of the Study:

• To experimentally determine the nature and strength of interactions between fibrin monomers.
• To quantify the shear stress required for the detachment of fibrin-coated particles.

Main Methods:

• Utilized a custom-designed shear stress flow chamber to study the detachment of fibrin-coated latex particles from a fibrin-coated glass surface.
• Performed experiments under varying conditions, including the number of fibrin layers and the presence of plasmin.
• Applied an adhesion model based on force and torque balance, assuming elastic behavior of fibrin bonds.

Main Results:

• Non-specific DLVO interactions were found to be negligible compared to fibrin monomer interactions.
• The elastic force at rupture of an elementary intermonomeric fibrin bond was determined to be approximately 400 pN.
• This rupture force was found to be independent of the number of fibrin layers involved in the contact.

Conclusions:

• The study quantifies the intrinsic strength of individual fibrin-fibrin bonds.
• Findings provide crucial insights into the mechanical properties of fibrin networks and thrombus stability.
• The force required for fibrin bond rupture is a fundamental property, unaffected by the extent of fibrin layering.