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Passive deformation analysis of human leukocytes
1Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY 10027.
Journal of Biomechanical Engineering
|February 1, 1988
Summary
Human leukocyte rheology was studied using a novel model of a viscoelastic shell and fluid. This model accurately predicts cell behavior during micropipette experiments, enhancing our understanding of leukocyte mechanics.
Area of Science:
- Biophysics
- Cellular Mechanics
- Rheology
Background:
- Leukocyte rheology is crucial for understanding cell function and disease.
- Previous models have not fully captured the complex viscoelastic behavior of these cells.
Purpose of the Study:
- To experimentally and theoretically investigate the passive viscoelastic behavior of human leukocytes.
- To develop and validate a new rheological model for leukocyte deformation.
Main Methods:
- Micropipette aspiration and expulsion experiments were performed on individual human neutrophils.
- A passive viscoelastic model was developed, featuring a pre-stressed cortical shell and a Maxwell fluid cytoplasm.
- A finite element scheme was established to simulate the model's behavior.
Main Results:
- The developed model accurately reproduces experimental data for both small deformations and large deformation recovery.
- The model successfully describes the average properties of leukocyte cytoplasm and the cortical shell.
- The finite element scheme showed close agreement with the analytical solution.
Conclusions:
- The proposed model provides a robust framework for understanding leukocyte passive viscoelasticity.
- This research offers insights into the mechanical properties of leukocytes, relevant to their physiological roles.