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Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases
Published on: June 22, 2012
Microvascular endothelial cells exhibit optimal aspect ratio for minimizing flow resistance
Ronen Sumagin1, Carl W Brown, Ingrid H Sarelius
1Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627, USA.
Annals of Biomedical Engineering
|March 5, 2008
Summary
Microvessel endothelial cells (EC) in mice exhibit optimal spacing, minimizing blood flow resistance, aligning with theoretical predictions for bumpy tubes. Arteriolar ECs achieve this optimum when vessels dilate.
Area of Science:
- Physiology
- Biophysics
- Fluid Dynamics
Background:
- Theoretical fluid dynamics predicts an optimal configuration for minimizing flow resistance in bumpy tubes.
- Endothelial cell (EC) morphology in microvessels influences blood flow dynamics.
Purpose of the Study:
- To test if microvessel endothelial cell morphology aligns with theoretical predictions for optimal flow resistance.
- To investigate the relationship between EC geometry and flow resistance in the microvasculature.
Main Methods:
- Confocal intravital microscopy was used to measure EC morphology in mouse cremaster muscle microvessels.
- Immunofluorescent labeling of ICAM-1 identified EC borders.
- Measurements were compared with analytical solutions for Stokes flow.
Main Results:
- The spacing of EC nuclei in venules closely matched the predicted optimal configuration for minimizing flow resistance.
- Arteriolar ECs were found to be optimized for flow resistance at dilated vessel diameters, not at rest.
- Significant deviations from optimal spacing may occur in less organized circulatory systems.
Conclusions:
- Microvessel geometry, specifically EC nucleus spacing in venules, appears optimized for efficient blood flow.
- Arteriolar ECs exhibit adaptive optimization of flow resistance based on vessel diameter.
- The findings suggest potential implications for understanding flow in pathological or developing microvasculature.
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