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Quantifying the Mechanical Properties of the Endothelial Glycocalyx with Atomic Force Microscopy
Published on: February 21, 2013
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Endothelial glycocalyx permeability for nanoscale solutes
Aleksei Kabedev1,2, Vladimir Lobaskin1
1School of Physics, University College Dublin, Dublin 4, Ireland.
Nanomedicine (London, England)
|July 11, 2022
Summary
Computational modeling reveals that excluded volume and electrostatic forces are key to nanoparticle transport across the endothelial glycocalyx (a cell surface layer). A damaged glycocalyx is less effective at filtering solutes.
Area of Science:
- Biophysics
- Cell Biology
- Nanotechnology
Background:
- The endothelial glycocalyx influences solute transport across cell membranes.
- Both specific and nonspecific interactions are critical for cross-membrane transport.
- Nonspecific interactions' role in solute distribution across the endothelial glycocalyx requires further quantification.
Purpose of the Study:
- To computationally model and quantify nonspecific interactions governing nanosized solute distribution across the endothelial glycocalyx.
- To evaluate the passage probability of nanoparticles through the luminal glycocalyx layer.
- To compare the significance of different interaction types (excluded volume, electrostatic, van der Waals, hydrodynamic) on solute transport.
Main Methods:
- Utilized computational modeling to simulate nanosized solute interactions with the endothelial glycocalyx.
- Quantified excluded volume, electrostatic, van der Waals, and hydrodynamic interactions.
- Assessed nanoparticle passage probabilities and estimated energy barriers and mean first passage times.
- Modeled both healthy and damaged glycocalyx structures.
Main Results:
- Excluded volume and electrostatic interactions were identified as the primary drivers of solute transport.
- Van der Waals and hydrodynamic interactions played a lesser role in solute distribution.
- Simulated damaged glycocalyx models exhibited significantly reduced efficiency in sieving plasma solutes.
- Calculated energy barriers and mean first passage times provide insights into transport dynamics.
Conclusions:
- Nonspecific interactions, particularly excluded volume and electrostatics, are crucial for regulating nanoscale solute transport across the endothelial glycocalyx.
- The glycocalyx acts as a selective barrier, with its integrity essential for effective solute filtration.
- Computational modeling provides a valuable approach to understanding the biophysical mechanisms of solute transport at the endothelial cell surface.
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