Measuring erythrocyte deformability with fluorescence, fluid forces, and optical trapping

Area of Science:

• Biophysics
• Cell Biology
• Hematology

Background:

• Red blood cell (RBC) deformability is crucial for circulation.
• Altered membrane rigidity is linked to various RBC hematological disorders.
• Quantifying RBC mechanical properties requires precise experimental methods.

Purpose of the Study:

• To develop and validate a novel laser-based method for probing single RBC buckling.
• To determine RBC membrane shear modulus and buckling properties under physiological conditions.
• To assess the method's efficacy in studying normal, infected, and conditioned RBCs.

Main Methods:

• Utilized a laser-based optical trap combined with a liquid flow cell and fluorescence microscopy.
• Applied the method to measure mechanical properties of single RBCs.
• Investigated buckling behavior of normal, Plasmodium-infected, and conditioned RBCs.

Main Results:

• Successfully measured shear modulus and buckling properties of single RBCs.
• Demonstrated the method's ability to differentiate between normal and Plasmodium-infected RBCs.
• Observed the effect of Plasmodium falciparum-conditioned medium on RBC mechanical properties.

Conclusions:

• The developed laser-based method provides a simple yet effective way to quantify single RBC deformability.
• This technique shows potential for early detection and diagnosis of RBC hematological disorders.
• Further application of this method can advance understanding of RBC pathomechanics.