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Updated: Apr 21, 2026

Investigating Receptor-ligand Systems of the Cellulosome with AFM-based Single-molecule Force Spectroscopy
Published on: December 20, 2013
Effects of cellular viscoelasticity in multiple-bond force spectroscopy
1Department of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD, 21250, USA, vkg@umbc.edu.
Cellular features like viscoelasticity and fluid drag affect receptor-ligand bond rupture. This study shows cell viscoelasticity lowers rupture forces and increases bond lifetime for polymorphonuclear leukocytes (PMNs).
Area of Science:
- Biophysics
- Cellular Mechanics
- Adhesion Dynamics
Background:
- Receptor-ligand bond detachment is crucial for cell adhesion.
- While molecular forces dominate, cellular features like deformability and viscoelasticity also play a role.
- Understanding these cellular contributions is key to comprehending cell adhesion dynamics.
Purpose of the Study:
- To investigate how cell viscoelasticity and viscous drag influence receptor-ligand bond rupture.
- To quantify the effect of these cellular properties on bond force transmission and rupture dynamics.
- To model the behavior of polymorphonuclear leukocyte (PMN) bonds under external load.
Main Methods:
- Monte Carlo simulations were employed to model the rupture of multiple receptor-ligand bonds.
- Micromechanical models of a polymorphonuclear leukocyte (PMN) cell were used.
- Simulations considered a PMN cell suspended in a Newtonian fluid.
Main Results:
- Viscous drag and cellular viscoelasticity modulate the transmission of external loads to receptor-ligand bonds.
- Cellular viscoelasticity results in instantaneous intermolecular bond force being lower than the applied external force.
- Cellular viscoelasticity leads to decreased mean intermolecular bond rupture forces and increased mean bond lifetime.
Conclusions:
- Cellular viscoelasticity significantly impacts receptor-ligand bond rupture dynamics.
- These findings highlight the importance of considering cellular mechanical properties in adhesion studies.
- The study provides insights into the biomechanics of cell adhesion and detachment.
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