Strain energy function of red blood cell membranes

Area of Science:

• Biophysics
• Cell Mechanics
• Materials Science

Background:

• Human red blood cell membrane exhibits variable elastic modulus values in literature.
• Understanding membrane mechanics is crucial for cell behavior and disease diagnosis.

Purpose of the Study:

• Develop a unified strain energy function for the human red blood cell membrane.
• Explain the mechanical behavior of red blood cells, including sphering.
• Investigate implications for experimental techniques like sieving and micropipette assays.

Main Methods:

• Formulated a two-term strain energy function incorporating constant area deformation and area change-dependent stress.
• Applied the function to model the sphering of red blood cells in hypotonic solutions.

Main Results:

• The model successfully reconciles differing elastic modulus values.
• Demonstrates that a homogeneous membrane can achieve a near-perfect sphere.
• Provides insights into red blood cell behavior during osmotic stress.

Conclusions:

• The proposed strain energy function offers a comprehensive model for red blood cell membrane mechanics.
• The model aids in interpreting experimental results from micropipette and sieving studies.
• This work advances the understanding of red blood cell biomechanics and its variability.