Multi-channel kinetics of fibrin network self-assembly

Area of Science:

• Biophysics
• Biomaterials Science
• Chemical Kinetics

Background:

• Fibrin networks are essential for blood clotting.
• They are utilized in tissue engineering and biomedical applications.
• Understanding fibrin self-assembly is key to optimizing these uses.

Purpose of the Study:

• To develop a coarse-grained kinetic theory for fibrin network self-assembly.
• To analyze the competing mechanisms of fiber growth (elongation vs. lateral aggregation).
• To determine analytical dependencies of gel formation and network structure.

Main Methods:

• Coarse-grained kinetic theory modeling.
• Analysis of fibrinogen to fibrin monomer conversion by thrombin.
• Modeling diffusion-controlled aggregation of protofibrils into fibers.
• Identification of single-stage (thrombin-controlled) and two-stage (kinetically controlled) self-assembly regimes.

Main Results:

• Analytical dependencies of gel formation rate and network structure parameters were derived.
• Two primary self-assembly regimes were identified: single-stage and two-stage.
• Model predictions align with experimental data across various physiological conditions.

Conclusions:

• The developed kinetic theory accurately describes fibrin network self-assembly.
• The theory provides insights into how fibrinogen and thrombin concentrations influence network formation.
• This work offers a foundation for controlling fibrin-based biomaterials.