Simulating single cell experiments in mechanical testing of adipocytes.

Area of Science:

• Biophysics
• Cell Biology
• Biomechanical Engineering

Background:

• Adipocytes play crucial roles in energy storage and metabolism.
• Understanding adipocyte mechanical properties is vital for research in obesity and pressure ulcers.
• Existing models often lack detailed structural and maturational aspects.

Purpose of the Study:

• To develop novel 3D finite element models of adipocyte mechanical behavior.
• To simulate large deformation responses of maturing adipocytes under physiological loading conditions.
• To investigate the influence of cell structure and maturation on mechanical properties.

Main Methods:

• Empirically acquired geometrical properties of cultured adipocytes were used.
• Four distinct stages of adipocyte differentiation and maturation were modeled.
• Simulations included compression and stretching of individual adipocytes.

Main Results:

• External loads induced localized strains on the plasma membrane, peaking over lipid droplets (LDs).
• Effective cell stresses increased with cell maturation.
• Cell stiffness increased with maturation, correlated with the growing volume of lipid droplets.

Conclusions:

• Adipocyte mechanical behavior is significantly influenced by cell structure, dimensions, and maturation.
• Finite element modeling provides insights into adipocyte responses to mechanical loads.
• These findings are fundamental for interpreting cell mechanics experiments involving adipocytes.