Elastic hysteresis loop acts as cell deformability in erythrocyte aging

Area of Science:

• Biophysics
• Hematology
• Cellular Mechanics

Background:

• Erythrocyte aging is linked to decreased cellular deformability.
• Cell deformation involves both passive and active components, with active deformation previously understudied.

Purpose of the Study:

• To investigate the role of active deformation in erythrocyte aging.
• To quantify Young's moduli and deformation parameters in age-related erythrocytes.
• To explore the relationship between erythrocyte deformability and energy states.

Main Methods:

• Atomic force microscopy was used to measure Young's moduli of age-related erythrocytes.
• Deformation, passive deformation, and active deformation values were calculated using area measurements.
• Elastic hysteresis loops were analyzed to characterize erythrocyte deformability.

Main Results:

• Erythrocytes in the densest fraction exhibited higher Young's modulus, deformation, and active deformation, but lower passive deformation.
• Both overall deformation and active deformation increased with erythrocyte aging.
• Active deformation was identified as a significant mechanical factor in aged erythrocyte clearance.

Conclusions:

• Erythrocyte deformability can be characterized by energy states, represented by elastic hysteresis loops.
• Active deformation is a critical mechanical factor influencing the removal of aged erythrocytes.
• This research provides valuable information on erythrocyte biomechanics relevant to cell clearance mechanisms.