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Atomic force microscopic observation of mechanically traumatized erythrocytes
Yuji Ohta1, Hiroshi Okamoto, Masahiro Kanno
1Department of Mechanical Engineering, and Graduate School of Engineering, Toyo University, Kawagoe, Japan. yuji@cc.ocha.ac.jp
Artificial Organs
|March 2, 2002
Summary
Mechanical stress damages red blood cells (erythrocytes) during artificial circulation. Atomic force microscopy revealed increased erythrocyte surface roughness with prolonged stress, correlating with hemoglobin release.
Area of Science:
- Biophysics
- Biomaterials Science
- Hematology
Background:
- Artificial organs can cause mechanical damage to erythrocytes.
- Current methods for assessing damage rely on secondary chemical markers like hemoglobin and LDH.
- These markers do not directly assess physical changes to the cell membrane.
Purpose of the Study:
- To investigate the traumatizing mechanism of erythrocytes under mechanical stress from a microbiological perspective.
- To directly visualize and quantify physical changes on the erythrocyte surface.
- To establish a new method for evaluating erythrocyte damage.
Main Methods:
- Sheep erythrocytes were subjected to a constant shear rate of 1,800 s⁻¹ for 0.5, 1, and 2 hours.
- Erythrocyte surface topography and roughness were measured using Atomic Force Microscopy (AFM) at a nanometer scale.
- Concentration of liberated hemoglobin was measured concurrently.
Main Results:
- Mechanical shear stress significantly altered the fine structure of the erythrocyte surface.
- Erythrocyte surface roughness increased with extended exposure time.
- Increased surface roughness showed a positive correlation with liberated hemoglobin concentration.
Conclusions:
- AFM visualization and surface roughness measurement provide a direct method to assess erythrocyte mechanical trauma.
- This technique offers a novel parameter for studying both hemolytic and subhemolytic damage.
- Understanding direct physical changes is crucial for improving artificial circulatory devices.