Multiscale simulation of erythrocyte membranes

Area of Science:

• Biophysics
• Computational Biology
• Cellular Mechanics

Background:

• Red blood cells (RBCs) undergo significant mechanical deformation.
• Understanding RBC mechanics is crucial for diagnosing and treating related diseases.
• Existing models often lack the multiscale detail to capture complex cellular responses.

Purpose of the Study:

• To develop a multiscale computational method for predicting RBC mechanical response.
• To correlate internal stress distributions with overall cell deformation.
• To investigate mechanically induced remodeling and phenomena like vesiculation.

Main Methods:

• A three-level multiscale model integrating finite element analysis (Level III), molecular-based modeling (Level II), and stress-strain analysis (Level I).
• Modeling the RBC membrane as two continuum shells with specific skeleton-bilayer interactions.
• Incorporating spectrin (Sp) folding/unfolding reactions into the mechanical properties.

Main Results:

• Model verification against experimental and numerical data for cell shape and deformation.
• Prediction of detailed interaction forces between the lipid bilayer and skeleton, identifying dissociation risks.
• Correlation established between spectrin unfolding and increased mechanical load on skeleton-bilayer pinning points.

Conclusions:

• The developed multiscale method accurately predicts RBC mechanical behavior and remodeling.
• The model provides insights into the mechanisms underlying RBC vesiculation.
• This approach can advance the understanding of RBC pathomechanics and potential therapeutic interventions.