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Controlled Microfluidic Environment for Dynamic Investigation of Red Blood Cell Aggregation
Published on: June 4, 2015
Human red blood cells deformed under thermal fluid flow
Ji-Jinn Foo1, Vincent Chan, Zhi-Qin Feng
1Max Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG), Pfotenhauerstrasse 108, 01307 Dresden, Germany.
Biomedical Materials (Bristol, England)
|May 7, 2008
Summary
Heating human red blood cells (RBCs) increases their deformability, especially at higher flow velocities. Post-heating, RBC deformation becomes irreversible and softer, exhibiting strain-hardening behavior.
Area of Science:
- Biophysics
- Fluid Dynamics
- Materials Science
Background:
- Human red blood cells (RBCs) are crucial for oxygen transport and their mechanical properties are vital for circulation.
- Understanding RBC biomechanics under varying conditions, like temperature changes, is essential for diagnosing and treating related diseases.
Purpose of the Study:
- To investigate the flow-induced mechanical deformation of human red blood cells (RBCs) during thermal transitions.
- To determine surface stresses on deformed RBCs using computational fluid dynamics (CFD) simulations.
- To elucidate the coupled effects of temperature and hydrodynamics on RBC biomechanical properties.
Main Methods:
- Laser tweezer experiments were used to measure RBC deformation.
- Computational fluid dynamics (CFD) simulations were employed to analyze surface stresses.
- Experiments covered thermal transitions from room temperature to 42.0°C.
Main Results:
- RBCs exhibited increased deformability when heated from 37.0°C to 42.0°C, particularly at higher flow velocities.
- RBC deformation became irreversible and the cells softened after heat treatment, reaching a plateau at flow velocities above 60 microm s⁻¹.
- Simulated stress correlated with the progression of thermotropic phase transitions.
Conclusions:
- The study reveals significant coupled temperature and hydrodynamic effects on human erythrocyte biomechanics.
- RBCs demonstrate strain-hardening-like behavior after thermal treatment.
- These findings offer new insights into RBC behavior in model hydrodynamic systems under thermal stress.
